Feasibility study report of 1000 tons of electrolytic copper project

1000 tons electrolytic copper project feasibility study report

Heilongjiang Baoshan Mining Development Company

table of Contents

Chapter 1 General

Chapter II Geological Resources

Chapter III Mining

Chapter IV Smelting

Chapter V General Map Transportation

Chapter VI Public Facilities and Civil Engineering

Chapter VII Investment Estimation

Chapter VIII Environmental Protection

Chapter IX of associated metals

Chapter X Economic and Social Benefits

Chapter 1 General

Section 1 Overview

I. Nature of the project, geographic location of the traffic and regional economic profile

This project belongs to Duobaoshan Oxidation Mining Project. Heilongjiang Baoshan Mining Development Co., Ltd. is a mining enterprise that obtains electrolytic copper by leaching-extraction-electrowinning process. The company is located in Nenjiang County in the central and western part of Heilongjiang Province. The mining area is about 156 kilometers northeast of Nenjiang County. The geographical coordinates are 125.46`05`` and 50.14`45`.

Currently there are easy road to the mine outside the tender call roads connecting standard gauge railway from the mining area nearest station is Heibaoshan station, a distance of about 12 km around the country communicate with external transportation is very convenient.

The mining area is a low hilly area, which is a farming and forestry area with few residents. The majority of the land in the mining area is wasteland and jungle. The local residents are mainly engaged in agroforestry and the industry is sparse. The regional climate is characterized by long cold in winter and short heat in summer.

Second, the background and basis of the feasibility study

China is a country with a shortage of copper. The annual demand for copper is about 1 million tons. The gap is still in need of import. Although China has a large amount of copper reserves, there are fewer and fewer copper mines that can be economically processed by traditional smelting processes. The development of refractory copper oxide or low-grade copper ore, which has not been exploited and utilized, has made initial progress. The Beijing Research Institute of Mining and Metallurgy established an annual output of 200 tons of electrolysis in the Duobaoshan Copper Mine in 1995 using copper oxide ore. Copper leaching-extraction-electrowinning test factory, which was put into operation in June 1995. After more than two months of production and operation, it has achieved good technical and economic indicators. The 1,500-ton electrolytic copper of Tongshan Copper Mine was successfully put into operation. The leaching-extraction-electrowinning process of the Duobaoshan copper ore oxidized ore and low grade ore is effective.

Heilongjiang Province consumes about 25,000 tons of copper metal per year. The current annual output is about 0.3 million tons. The self-sufficiency rate is very low. It is imperative to mine the Duobaoshan copper mine. Duobaoshan Copper Mine is a very large mine. Due to the low grade of ore and the refractory copper oxide ore in the upper part of the ore body, it is uneconomical to use conventional conventional smelting process, so it cannot be developed. Recently, a large number of experimental research and production practices have been carried out on the ore properties at home and abroad. The leaching-extraction-electrowinning process has been used to treat the new process of production of such oxidized ore and low-grade ore, with the highest investment and low production cost. Sex. The Duobaoshan Copper Mine uses this new process to develop mines, which can achieve better economic and social benefits.

3. In view of the fact that the Duobaoshan Copper Mine is a large-scale copper base, mainly copper, containing a variety of rare and precious metal minerals, it is necessary to strengthen experimental research for comprehensive recovery. The total reserves of copper metal in the ore body is 2.37 million tons, of which the surface copper oxide ore reserves are about 100,000 tons. The main object of this design is that the original layout of the mining Duobaoshan mining area will not affect the design layout of the future mining of the original copper mine. This is the main design content and requirements of this feasibility study report. The scale of the enterprise is designed according to 1000 tons of electrolytic copper. Therefore, the production capacity of mining and leaching-extraction-electrowinning is calculated based on the annual output of 1000 tons of electrolytic copper.

Construction conditions of the second section of the project

I. Resource conditions of the project

The raw materials mined by the enterprise are copper oxide ore. The burial depth of the copper oxide ore in the Duobaoshan mining area is no more than 25 meters, the surface soil cover is shallow, and the mining area is a low hilly area. The terrain height difference is about 50 meters, and the slope of the site is not Large, open terrain, ore mining is suitable for open-pit mining. The total amount of designed copper oxide ore in this region is 4.22 million tons, with a grade of 0.48% and a metal content of 20,300 tons. According to the enterprise's annual output of 1000 tons of electrolytic copper, the annual output of 260,000 tons of ore can meet the needs of 1000 tons of electrolytic copper per year. The production service period of the enterprise is 14 years, indicating that the resources of the company's main raw material copper oxide ore are absolutely reliable.

Second, the external conditions of the project

The external transportation of the mining area is road transportation. At present, the 6 kilometers of simple roads in the mining area are connected to the national road of the tender. The 6-kilometer simple highway has met the requirements of the highway from the standard of the line plane and vertical section. It is only necessary to widen the roadbed of some road sections and add mud and gravel roads on the whole line, which can ensure the smooth transportation of the roads to the outside.

Section III Construction Plan

First, the overall layout principle

Duobaoshan Copper Mine is a large-scale porphyry copper mine with a total metal content of 2.37 million tons. The ore has primary copper sulfide ore and copper oxide ore. Therefore, in the overall layout of the mining area, it is necessary to pay attention to the upper part of the ore body. At present, the layout of all industrial sites should avoid the scope of mining of large-scale copper mines in Duobaoshan in the future, so as not to increase the unfavorable factors in the mining of large-scale copper mines in Duobaoshan. In the overall layout of the enterprise, we must first ensure that the overall production process of the enterprise is smooth. From the raw materials of the mining - raw material processing - the internal and external transportation of the finished product, not only must the production and transportation distance be the shortest, but also avoid the roundabout transportation phenomenon in the production process. Only in this way can we reduce production costs and provide favorable conditions for enterprises to increase profits.

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The production scale of the company is 1000 tons of electrolytic copper per year. According to the feasibility study, it is feasible for the enterprise to produce 1000 tons of electrolytic copper products per year.

According to the requirements of the production scale of 1000 tons of electrolytic copper per year, combined with the copper content of copper oxide ore in the Duobaoshan mining area (0.48%) and the leaching-extraction-electrowinning test report of the Dabaoshan copper ore by the Beijing Research Institute of Mining and Metallurgy The data, the heap immersion work day is 210 days. After calculation, the mine is required to provide an annual output of 260,000 tons of copper oxide ore, a mining day of 280 days, and a mining day production scale of 935 tons of copper oxide ore.

Third, the company's production process selection

The traditional process not only has large investment, high production cost, but also is not suitable for processing low-grade oxidized ore. At present, it has made great progress in dealing with low-grade oxidized ore at home and abroad, using copper oxide ore leaching-extraction-electrowinning process, directly To achieve electrolytic copper products, this hydrometallurgical process has the advantages of small investment and quick effect. In recent years, especially in Yunnan, copper oxide ore has been widely used in the leaching-extraction-electrowinning process, and has achieved good economic benefits. The Duobaoshan Copper Mine has carried out leaching-extraction-electrowinning tests on low-grade copper oxide ore in 1995, and has also achieved good experimental indicators. Therefore, this feasibility study recommends the use of ore leaching-extraction-electrowinning production processes.

Chapter II Geological Resources

Section 1 Overview

1. The exploration work in the Duobaoshan mining area has experienced two stages, 1958-1962 and 1972-1981. During this period, drilling of 161,500 meters, 205 meters of shafts, 461 meters of roadways, 205,000 meters of troughs, and 7065 meters of wells were completed. And made the corresponding laboratory analysis. The relevant topographic geological drawings were mapped and surveyed, and the exploration investment was 14.71 million yuan. A detailed investigation of the Duobaoshan copper deposit was prepared. The total reserves submitted were 2.37 million tons of copper, 81,000 tons of molybdenum , 73.4 tons of associated gold and 1046 tons of silver .

After exploration, the scale of the deposit, the occurrence law of the ore body and the hydrogeology of the deposit have been ascertained, and the process test of the ore processing and ore dressing method has also been carried out. Due to the large scale of the development and construction of mineral deposits and mines, the required investment is large, so it has not been implemented yet.

Second, the main ore body of the mining area and the upper part of the subordinate ore body are exposed to oxidized ore. These ores adopt general conventional mineral processing methods, with low recovery rate and low economic benefits. Therefore, the mining area has not been developed on a large scale. In recent years, China has accumulated some experience in oxidizing ore mining, especially the heap leaching-extraction-electrowinning process test in the Duoshanshan Tongshan mining area has been successful. Based on these experiences, it is proposed to first treat the oxidized ore in the Duobaoshan mining area, and create conditions for large-scale development of the mine, which is also in line with the state's proposed exploration and mining integration policy.

The second section of the deposit geology

I. Geological characteristics

The exposed strata in the mining area include the Central Ordovician Formation, the Tongshan Formation, the Duobaoshan Formation, the Upper Ordovician Naked River Formation, the Aihui Formation and the Lower Silurian Huanghuagou Formation, and the Quaternary loose sediments.

The obvious structural traces in the mining area are: the northwestward tectonic structure of the Hualixi period structure and the northeastward tectonic structure. The east-west structure of the Yanshanian cycle. The northwest-trending structural area is the ore-bearing structure and the ore-conducting structure, the north-eastward structure is the ore-conducting structure, and the east-west structure is the post-mineral structure.

The magmatic rocks are mainly the blasted rocks in the middle Caledonian and the mid-late intrusive rocks in the Hualixi area. The spurt rock in the middle of Caledon is mainly the Andesite and Yinganyan in the Duobaoshan Formation. There are intrusive rocks in the late Hualixi, mainly quartz diorite , longer granodiorite and slanted long granite porphyry. There are also diorite porphyrites and fine-grained diorite associated with intrusive rocks.

Second, the characteristics of the deposit

The porphyry copper deposit in the Duobaoshan mining area is located at the dumping end of the inverted anticline of Duobaoshan, controlled by the northwestward arcuate fault and cross structure. The deposit consists of 215 ore bodies in 4 ore belts. Among them, there are 14 main ore bodies, with the No. 3 ore body of No. 3 ore belt, the largest, accounting for 73.4% of the total reserves; followed by the No. 4 ore body of No. 1 ore belt, accounting for 9.7% of the total reserves. The No. X ore body is 1400m long, 23-34m wide, and extends 300-1000m. It is curved in the northwest-south east direction. The No. IV ore body is 850m long, with a maximum thickness of 200m, a depth of more than 850m and a inclination of 75°. The main ore section is located in the physicochemical altered granodiorite, and the copper deposits in the granodiorite account for more than 90%. The elevation of the exposed surface of the ore body is between 570 and 490 m.

4 ore zones are located in the band of sericite. The ore belt is closely related to sericitization and physicochemical properties. The No. 1 ore belt is located in the lower part of the porphyry and the potassic belt; the No. 3, No. 2 and No. 4 ore belts are located in the upper plate of the porphyry and the potassic belt; the three are arranged in the right-row geese from the northwest to the southeast. . The ore body is irregular, lenticular or plate-like in the ore belt. Most of the ore bodies are thick and have a high grade, and the plates are sharpened to the ends and down.

The mining area is located in the cold temperate zone, with an average annual rainfall of less, a long freezing period, and the groundwater is not rich, so the proportion of surface ore oxidized ore (copper oxide / total copper > 30%) is small; the main body of the deposit is the original sulfide ore. However, due to the large scale of the ore body, the absolute amount of the oxidized ore is still considerable, and it can be used as a raw material base for the scale mining of oxidized ore.

Oxidation zone characteristics: In the range of several meters to three or fifty meters below the surface of the earth, some incompletely developed weathering leaching belts and secondary oxidation enrichment and secondary sulfide enrichment are often formed.

Weathered leaching belt, exposed to the surface or below the surface to more than 30 meters. In-band metal sulfide or partial oxidation, or complete oxidation. The rocks are grayish white, leaving only the minerals to leak holes; some are limonite, water needle iron ore and different degrees of development of malachite, azurite, azurite, black copper ore.

For the No. IV ore body to be mined, the development depth of the oxidation zone is generally about 25m, and the individual can reach 30m. Oxidized ores are mainly epigenetic minerals, and their minerals include cupro ore, limonite, azurite, black copper, hematite and the like.

The surrounding rocks and rocks of the orebodies are mainly chlorite-rich sericite granodiorite and qinghuahua granodiorite, followed by fine-grained diorite.

Section III Hydrogeology

The mining area is located on the hillside section, with the northeast high and the northwest low. The surface elevation of the ore body is 560~515m, and the lowest erosion reference surface is 512m. About two-thirds of the reserves are below the etched reference level, and most of the open-pit mining oxidized ore is above the etched reference surface.

The climate in the area is cold, with the highest temperature of 31.5 °C and the lowest temperature of -37 °C. The annual rainfall is 531-586mm, and the volume is 869-990mm.

In the ore body, only weathered fissure water is present in the weathered fracture zone. The bottom of the weathering zone is generally 20-50m deep and 60m maximum. The thickness of the aquifer is generally 10-40m, the average thickness is 26.58m, and the depth of the phreatic ground is 2-20m. The height of the terrain is relatively shallow, and the water level at the lower part is buried deep.

Deep rock formations or rock mass below the weathering zone, the joints are not developed and do not contain water.

Surface water in open pit mining is the amount of stormwater inflow and groundwater infiltration. Due to the small size of the stope, mechanical drainage can be used.

Section 4 Deposits

Copper and molybdenum ore reserves calculation industrial indicators

After years of geological work, the scale of deposits and the law of occurrence of ore bodies have been identified, and the boundaries of ore belts and ore bodies have been delineated, and basic control has been carried out in the deep; the quality of ore has been basically ascertained. It is a porphyry copper mine with a large grade. Can be used as a copper raw material base for large-scale mining. At the same time, it is necessary to comprehensively recover molybdenum, gold and other metals of platinum to improve the economic benefits of developing the deposit.

Chapter III Mining

The first section of mining methods

The ore deposit is located in the upper part of the ore body, most of which directly exposes the surface, partially covering a thin soil layer. The depth of the oxidation zone is generally less than 25m, and the maximum depth is 30 or 40m. It is suitable for open mining. Therefore, the open-pit mining method is adopted, and the technology is simple. , economically reasonable.

Section 2 Determination of mining area and open-pit mining boundary

According to the information provided by the Second Geological Survey of the Bureau of Geology and Mineral Resources of Heilongjiang Province, the ore quantity in the mining area is as follows:

According to the requirements of the electric power plant with an annual output of 1000t electrolytic copper, and leave appropriate development space, determine the mine production scale for the 26t/a production period of ore according to 15-20 years, and correspondingly define the open-pit mining boundary. Considering that the No. 4 ore body No. 4 ore body is relatively rich in oxidized ore, it is 0.5 to 1 km away from the No. 5 ore body of the main ore body of the mining area, and has little impact on the main ore body in the future mining area. No. 4 ore body oxidized ore, and determine the open-pit mining boundary in the early stage of production.

The total slope angle of the stope is temporarily 50°, which has a proper transportation and safety platform, and the slope angle of some stages is 70°.

The average stripping ratio is 0.6 t/t.

The No. 4 ore body is the boundary of the pre-production period (1st to 8th years), and the oxidized ore of No. 5 and other ore bodies is the reserve ore, which is bounded by another boundary.

Section 3 Mine Work System, Production Capacity and Service Years

Mine work system: The mining area is located in the cold temperate zone, and the cold weather in winter affects the heap leaching operation. In order to be appropriate with the heap leaching operation, the mine adopts a continuous working system of winter intermittent other seasons. Every year, the equipment is repaired in the middle and the middle of the year. The mine works for 280 days, 3 shifts a day, and 8 hours per shift.

The annual mining volume of the mine: 260,000 tons/year, and the annual mining and stripping capacity is 340,000 tons/year.

The daily mining volume of the mine is 714.3 tons/day, and the daily mining and stripping rock volume is 1214.3 tons/day.

Production capacity verification: The stope often works in one stage. Each stage has a mining working face and a stripping working face. According to the length and width requirements of the mining work line, the mining face is very rich. From the mining intensity, the annual mining Reduced to a 10m stage, the production capacity is guaranteed, and the mining intensity is not large.

According to the passing capacity test of the stopway car transportation road, the stope is below 15 vehicles/h, which is lower than the third-class pavement 25 vehicles/h. It can be seen that the road transport capacity is also very rich.

Years of mine service: No. 4 ore body has an oxidized ore volume of 1.6 million tons, a stope capacity of 260,000 tons/year, and can hold 6 years of production; other ore body oxidized ore of 2.54 million tons can be produced for 12 years as a reserve mine. 15-20 years.

Section 4 Development of Transportation Systems and Equipment

The ore body is located in the low hills and the crushing station and the heap leaching field are arranged on the gentle valley in the northwest of the No. 4 ore body. The waste rock field is discharged near the stope. The ore and waste rock transport distance is 0.8 to 1.5 kilometers. The stope is small, suitable for automobile road transportation, the mine infrastructure construction is small, and the production is simple and easy.

The two-lane road of the stope road is 12m wide and is arranged on one side of the stope. The maximum slope is 8~10%, which is convenient for production and also has sufficient room for expanding production capacity. The ore is loaded by ZK-50 front loading machine, and the transportation is selected from Jiefang diesel 5 tons dump truck (CA1091K2L2).

Section 5 mining and stripping work

Since the ore body directly exposes the rock formation, there is a sandwich in the ore body, and the horizontal stage mining method is adopted, and the mining is carried out along the strike direction, and the stage height is 10 m. It is worn by KQG-100 DTH drilling rig . The large ore is crushed by Y-24 rock drill. It is loaded by ZL-50 front loader. The minimum working platform width is 30m and the bottom width of the trench is 20m.

Section 6 Infrastructure and Production Schedule

Most of the ore bodies are directly exposed to the surface, and some of them cover the soil. During the period of infrastructure construction, it is stripped according to the requirement of meeting the annual output of 260,000 tons of ore two-stage ore. After calculation, the amount of infrastructure stripping is 47,000 m, of which 30,000 m of exfoliated soil and 17,000 m of by-product ore (46,000 tons). The infrastructure stripping arrangement is completed in 0.5 to 1 year.

According to the occurrence of ore bodies, the production stripping ratio is determined to be 0.7-0.5t/t according to the requirements of equal production and stripping.

Annual electricity consumption during production: 340,000 degrees / year

Annual water consumption during production: 20,000 tons / year

Main material consumption of mine:

1. Drill pipe 4

2, impactor jacket 15

3, hard alloy 90kg

4, wire rope 110m

5, duct 60kg

6, wind rope 200m

7, brazing steel 60kg

8. Explosives 51t

9, 5000 detonators

10, the fuse line 4000m

11, the detonation line 8400m

12, diesel 540t

13, oil 60t

14, turbine oil 10t

15, yellow dry oil 10t

16, 96 tires

Section VII drainage in the stope

In the hilly area where the mining site is located, it is possible to dig trenches or embankments (low-lying areas) around the stope to prevent external surface water from flowing into the stope. The accumulated water in the stope is calculated, the stope area is 39,000 m, and the amount of stormwater inflow and groundwater infiltration is 1780 m/d. Three 6699×3 submersible pumps are used in the design (each drainage capacity is: Q=66m/h, H=29.1m), one of which is spare.

Section 8 Blasting Material Facilities and Explosives Library

The mining site was blasted with rock explosives and the explosives were purchased. A 5t explosives store (53m) is installed near the mine to store explosives, and a small blasting material store (28m) stores other explosive materials.

Chapter IV Smelting

Section 1 Overview

Through the Beijing Institute of Mining and Metallurgy Engineering Design and the Heilongjiang Provincial Bureau of Geology and Minerals, the second research institute jointly established an enterprise with an annual output of 1,000 tons of electrolytic copper in the Duobaoshan area. The raw material is copper oxide ore, mainly from the surface oxide ore of Duobaoshan Copper Mine, with a grade of 0.47% and a total metal reserve of 20,300 tons.

According to the nature of the raw materials, combined with the actual production situation at home and abroad, it is possible to adopt the "heap leaching-extraction-electrowinning" process, and the product is electrolytic copper.

In 1995, the Beijing Research Institute of Mining and Metallurgy used this process to carry out an industrial test of 200 tons of electric copper on similar copper oxide ore in the Duobaoshan area, and achieved good results. The report was temporarily--"Choth Oxide Leaching in Cold Areas" - Extraction-electrowinning process test study report" as a basis for the impregnation of the materials used in this feasibility study.

Section 2 Raw materials and auxiliary materials

First, raw materials

The raw material is copper oxide ore. The development zone of the No. 4 ore body of the No. 1 ore belt is generally about 25 meters, and the individual can reach 30 meters. The copper oxide ore is mainly composed of malachite, a small amount of azurite, a cuprite, a trace of natural copper and copper, and a small amount of limonite, water needle iron ore and goethite. Gangue quartz, plagioclase sericite, is easily leached ore type. The copper oxide ore has a lower grade and contains 0.49% copper.

Second, the main auxiliary materials

1. Sulfuric acid: concentrated sulfuric acid

2, coal oil: 260 "Kerosene

3, extractant: using Henkel's LIX984 as an extractant.

LIX984 is a mixture of 5-dodecyl salicylaldoxime and 2-hydroxy-5-mercaptoacetophenone oxime in a volume ratio of 1:1. The reagent contains no conditioning agent and is capable of extracting copper well from solutions containing soluble silicon or very fine solid particles. Its physical and chemical properties are as follows:

Physical properties

Appearance: amber liquid

Specific gravity: 0.91~0.92g/1

Flash point: >77°C

Chemical properties

Maximum copper load: 5.1 ~ 5.4g / 1 Cu

Extraction phase separation time: ≤70s

Stripping phase separation time: ≤80s

Extraction phase kinetics: 30s can extract more than 93% of Cu

Stripping phase kinetics: 30s can be back-extracted Cu 93% or more

Extraction Cu/Fe selectivity: ≥2000

The third section of the process

First, the choice of process

The traditional method of copper smelting is mining-mineralization-fire smelting, which is very effective in treating copper sulphide ore. However, for copper oxidized ore, the process shows its limitations, and the recovery rate of ore dressing is very low. The economic benefits are very poor. With the decreasing of copper sulfide ore resources, people pay more attention to the development and utilization of low-grade refractory copper oxide ore resources, and researched a new process of “leaching-extraction-electrowinning” to treat low-grade refractory copper oxide ore. effect. The process has the advantages of low investment, low cost, remarkable economic benefit, no environmental pollution, and has been widely used at home and abroad. At present, the world's electrolytic copper produced by this process is about 1 million tons. According to the nature of the copper oxide ore in the Duobaoshan area, combined with the actual production at home and abroad, this feasibility study also adopts this new process. There are many leaching methods for this process, such as spray heap immersion, buried pipe drip, agitation leaching and in-situ leaching downhole. The spray liquid is evenly distributed, the leaching effect is good, and the spray facility can be reused. The disadvantage is that it is limited by temperature and cannot be produced when the humidity is too low; the drip immersion method is suitable for ore with low grade and can be leached at low temperature. The disadvantage is that the distribution of the drip immersion liquid is not uniform, the leaching effect is not as good as that of the spray heap, and the drip immersion tube can not be reused; the stirring leaching is only suitable for the copper oxide rich ore with high grade; the in-situ leaching in the underground is still in the experimental stage. The grade of copper oxide ore in Duobaoshan area is very low (only 0.47% copper), the winter climate is cold and the freezing period is long. It is suitable for spraying. Canada has successfully carried out heap leaching production in winter, but there is no cold area in China. In the winter, the precedent for heap leaching production is carried out. For the sake of safety, it is proposed to adopt the spray heap leaching method, spray leaching production during the non-freezing period, and stop production during the freezing period. After the production, a certain scale of winter pipe drip immersion test can be carried out. If the test is successful, the double leaching method combining spray leaching and buried pipe dripping can be adopted, and the annual working day can be greatly extended without increasing the condition of the equipment. Under the circumstances, the factory production scale can be greatly improved.

Second, the production process

The copper oxide ore is subjected to secondary open-circuit crushing by a jaw crusher, and the ore has a particle size of 20 mm or less after crushing. The crushed stone is transported by the loader to the heap of the heap, which is about 5 meters high. After the ore pile is leveled, the spray pipe network is laid, and the liquid supply pipe is connected, and then the acidic raffinate having a pH of 1 to 1.5 is pumped for spraying, and the spray intensity is 7 to 101/mh. The spray liquid reacts with the ore, and the generated copper sulfate solution penetrates from the bottom layer, flows out from the liquid discharge pipe at the bottom of the ore layer, and enters the liquid collecting tank. When the copper ion concentration in the leachate is less than 2g/1, the crucible is sprayed again, and when it reaches about 2g/1, it is pumped to the extraction section for extraction production.

The extraction section adopts two-stage extraction and one-stage stripping. The extractant is LIX984 of Henkel Company and the diluent is 260 industrial kerosene. After the two-stage countercurrent extraction of the leachate, the raffinate contains 0.1-0.3 g/1 of copper, and the pH is 1~1.5. After flowing through the raffinate buffer tank, it flows into the raffinate pool, where it is returned to the heap after acid supplementation. Dip spray. The organic phase containing copper is 3~3.5g/1, and enters the stripping section to contact with the waste electrolyte. The obtained copper-rich liquid passes through the sand filter and enters the rich electrolyte storage tank, and is sent to the electrolysis section to produce electrolytic copper. The regenerated organic phase after stripping contains about 1.1 g/1 of copper and is returned to the extraction section to continue extracting copper.

In the electrolysis section, the Pb-Ca-Sn alloy is used as the insoluble anode, and the cathode is the pure copper initial sheet. The initial piece is produced on a stainless steel negative plate in the seed plate slot for 24 hours. The electrolyte is subjected to a cycle of up and down, and the electrolyte temperature is greater than 20 °C. The production cycle of electrolytic copper is 7 to 10 days. After the electrolytic copper is discharged from the tank, it is soaked and washed with water, dried and packaged. In order to control the electrolyte impurity concentration to maintain a certain level, part of the open circuit discharges the waste electrolyte, and is combined with the leach solution to extract and recover copper, and the residual acid is used for leaching and supplementing acid. In order to avoid fogging and polluting the environment, a layer of low-pressure polyethylene pellets (Φ1~3mm) of about 10mm thick is covered on each surface of the electrolyzer. In addition, a small amount of cobalt ions (60 mg / l) and a smoothing agent were added to the electrolyte to improve the quality of the cathode copper.

The fourth quarter is the main technical and economic indicators

broken

Breaking method: two-stage jaw crusher open circuit breaker open circuit broken

Particle size before crushing: 300mm

Particle size after crushing: 20mm

Broken working time: 280d

Heap dipping

Heap leaching cycle: 210d

Heap leaching method: spray heap leaching

Spraying intensity: 7～101/mh

Final leaching rate: 80%

Leachate: Cu2.0g/1, PH=2.0

extraction

Extractant: LIX984

Thinner: kerosene

Organic phase concentration: 8%

Extraction comparison: 1

Counter extraction: 2 to 3 (0/A)

Extraction series: level 2

Stripping series: level 1

Mixing time: 2min

Clarification rate: 36m/mh

Electrowinning

Rich electrolyte composition: Cu45g/1, H ₂ SO ₂ 172g/1

Waste electrolyte composition: Cu40g/1, H ₂ SO ₂ 180g/1

Electrolyte circulation speed: 950 1 / tank h

The same name pole spacing: 100mm

Current density: 150A/m

Slot voltage: 1.8 ~ 2.2V

Current efficiency: 90%

Main raw material consumption

Copper oxide ore: 281.11 t/tCu

Extractant: 3.5 kg/tCu

Kerosene: 94 kg/tCu

Sulfuric acid: 3.0 t/tCu

Water: 150 m/d Another 5000m circulating water

Electricity: 4000 kh/tCu

Recovery rate

Heap leaching rate: 80%

Extraction stripping recovery: 96%

Recovery of electrowinning: 99.5%

Other losses: 1%

Total recovery rate: 75.65%

Chapter V General Map Transportation

Section 1 Regional Overview

First, the geographical location

The Duobaoshan Oxidized Copper Mine is located in Nenjiang County, Heilongjiang Province, about 156km south of Nenjiang County and 24km west of Nenjiang. The geographic coordinates are 125°46′05′′ east longitude and 50°14′45′′ north latitude.

Second, the status quo of traffic

The mining area is 12km away from Heibaoshan Station of Nenjiang-Heibaoshan Local Railway. The existing 6km simple road near the mining area is connected with the tender road (Nenjiang-Huma). The external traffic conditions of the mining area are good.

Section 2 overall layout

First, the composition of the enterprise

The design of the Duobaoshan copper oxide mining area consists of two open pit mines, two waste rock yards and tailings yards, a crushing industrial site, an electrowinning industrial site, a mining industrial site, an explosive reservoir area, a ground middle balance, and a water source well. And pump room, high pool and other components.

The crushing industrial site is equipped with two crushing workshops and a broken ore yard.

The electro-industrial industrial site is equipped with an extraction electrowinning workshop, a effusion pool, an accident pool, a raffinate pool, a high-level liquid pool, and a comprehensive facility (shop office, laboratory, finished product warehouse).

The mining industry site is equipped with offices, canteens, bathrooms, single dormitory, boiler room, car maintenance and repair workshop, integrated workshop, garage, oil depot, guard room and so on.

The explosives storage area is equipped with an explosives warehouse (reservoir 5 tons), a blasting material library and a duty room.

The total area of ​​the mining area is about 80 hectares.

Estimation of earth and stone works in the heap leaching field, various industrial sites and road systems: 60,000 cubic meters of excavation and 80,000 cubic meters of filling.

Second, the principle of arrangement

1, no pressure mining, does not affect the development of large-scale mines in the future. The Duobaoshan mining area is a large-scale mine with a copper metal reserves of 2.37 million tons. It has been mastered in 1988. Its main industrial sites are located in the southwest of the No. 1 ore body of the No. 1 ore body. The ore copper metal content is only 20,000 tons, the scale is very small, in order not to affect the development of the entire mine in the future, under the premise of no pressure mining, the industrial site is placed in the north of the No. 1 ore body No. IV ore body.

2. Make full use of the terrain, save land, adapt to local conditions, compact layout, shorten transportation routes, and reduce operating costs.

3. Protect the environment and reduce the environmental impact of heap leaching tailings.

4. Conducive to production management and facilitating staff life.

Third, the design of the Duobaoshan copper oxide mining area, the oxidized ore part of the No. 1 ore belt IV ore body in the early stage mining, divided into two open-pit mines in the northwest and southeast, and waste rock fields are arranged at the mouth of the Mouth. The northwest waste rock yard is arranged in a gently and open valley nearby, and the southeast waste rock yard is laid out on a gentle slope. Such an arrangement can effectively shorten the transportation distance of waste rock and reduce operating expenses.

The mining industry site is arranged outside the blasting warning line and is located at the entrance and exit of the mining area. On the one hand, it is convenient for external relations, on the other hand, it is also convenient for production contact and management of other industrial sites.

The explosive storage area is arranged in the valley in the northwest of the mining area. It is about 500m away from the nearest heap leaching site, which is much larger than the 330m required by the specification. The design of the explosives warehouse follows the “Code for Safety Design of Civil Explosive Equipment Factory” GBJ89-85.

The external road of the mining area is connected to the existing simple road in the southeast of the No. 1 ore belt. The existing simple road can only meet the normal operation of the line after widening the roadbed and adding road surface to the Class III road standard. Requirements.

4. External power supply: The 10kv high-voltage overhead line will be led back to the high-voltage power distribution room of the extraction electric workshop from the Heibaoshan Substation, about 13 kilometers south of the mining area, to meet the production and living demand of the mining area.

V. Water supply and drainage in the mining area: The water is taken from the deep water well (hole ZK002) about 145m southeast of the No. 1 ore belt, and transported to the high-level pool of 100m through the pump warehouse to supply water to the entire mining area. After the production and domestic sewage have been treated to meet emission standards, they can be drained to nearby valleys according to local conditions.

Section III Internal and External Transportation

Due to the small scale of production in this mine, combined with the current traffic situation and the topographical characteristics of the mining area, the outer transportation in the mining area is transported by road. The road standards are all Grade III gravel suburban roads.

The transportation road surface of ore and waste rock is 7m wide, the turning radius is 25m, the road longitudinal slope is not more than 8%; the special road surface for explosives warehouse is 3m wide, the longitudinal slope is not more than 6%; the other main roads and external roads in the mining area are 6m wide. The average longitudinal slope is no more than 6%.

Sulfuric acid is sourced from Qiqihar and transported by rail to Heibaoshan Coal Mine. It is transported to the mining area by acid tanker. Other goods transported in addition to the extractant can be solved in Nenjiang County and transported into the mining area by car.

For the ore measurement, choose a 20-ton lever-type ground balance, which is placed near the crushing site. Sulfuric acid is transported by acid tanker, and oil transportation is carried out with oil tanks and 5 tons of trucks. There is no fire truck in the mining area, and it can cooperate with the Heibaoshan Coal Mine.

Chapter VI Public Facilities and Civil Engineering

The first section of water supply and drainage

First, the water supply

The maximum daily water consumption of the company is 350 tons. Among them, 70 tons of mining water; 150 tons of heap water; 60 tons of boiler water; 70 tons of domestic water.

According to the hydrogeological data provided by the Second Geological Survey of the Heilongjiang Geological Bureau, the pumping test was carried out on the well in the mine. The water inflow was 367.80T/D, which was greater than the maximum water consumption of the enterprise by 350 tons, indicating the use of groundwater in the water supply. It is reliable.

Second, drainage

The mining area is a low hilly area. The slope of the terrain is not large, and the natural drainage system of the mining area is good. The overall layout of the enterprise has not changed the natural status quo, and the total drainage direction of the mining area is still discharged from the north to the south.

There are no harmful substances in the surface water and groundwater of the mining site. Pumps can be used to raise rainwater and groundwater from the mining site to the edge of the mining area and outside the drainage area.

The surface water and production domestic wastewater of the mining industry site, the crushing site and the electro-accumulation site can be discharged into the west ditch of the site by the open trench after treatment, and discharged from the north to the south by the natural ditch to the outside of the mining area.

The circulating water of the leaching-extraction-electrowinning process contains acidic substances and is used for long-term recycling, and is not discharged to the outside, and does not adversely affect environmental protection.

The second section of power, automation instrumentation

First, the power supply

The Duobaoshan mining area is 13 kilometers away from the Heibaoshan substation. The primary side voltage of the Heibaoshan substation is 110KV. A 8000KVA transformer has been installed, and its load rate is 50%, which can completely supply power for the enterprise.

The mine area needs to return 10KVA line from Heibaoshan Substation, to the high-voltage power distribution room of the extraction electric workshop, and supply power to 500KVA rectifier transformer and 500KVAT production and life transformer.

Second, the power supply program

The installation capacity of the transformer is temporarily considered to be 500×2KVA. The high and low power distribution room, substation and rectification are installed in the same building of the electric workshop, and the silicon rectifier cabinet and DC bus should be properly configured. The production and domestic electricity transformers supply power to the mining area through the low-voltage power distribution device. The voltage loss of the power supply line shall not exceed 6% of the voltage drop at the normal load. Otherwise, a transformer shall be added in the mining area, and the open-pit mine power grid shall adopt a neutral point ungrounded system.

Third, equipment and automation

The transformer and rectification of the electric field workshop in the mining area can be monitored by the same control room. The rectifier is equipped with instantaneous overcurrent protection, rectifying element reverse flow through flow protection, overload protection, over voltage protection, neutral point direct system, cooling Various protections of the system and auxiliary equipment, monitoring of operating status, etc. The accident sound signal and the preview sound signal system should be set up in the rectification. The meter measurement on the DC bus side shall be set as appropriate according to the regulations of the Small Metal Electrolytic Rectifier.

Fourth, auto maintenance and repair facilities

The company's machine, electric repair and equipment maintenance work, set up car maintenance and repair workshop to undertake, its scope of work is as follows:

1. Responsible for the maintenance and repair of large-scale equipment (automobiles, loaders, bulldozers) of enterprises, and the large and medium-sized repair work of large-scale equipment is entrusted to external units.

2. Responsible for the maintenance work of enterprise machine repair and electric repair, as well as part of its mechanical processing and maintenance workload.

The auto maintenance workshop has repair equipment such as machine tools, electric welding, gas welding, etc. It is the maintenance center for the electromechanical repair of enterprises.

Five, heating

In view of the region where the company is located in a severe cold region, the minimum temperature is -37. C-40. C. During the icing period from October to April, the annual heating period is about 7 months. Therefore, the company needs to consider the heating of the production plant and living facilities in the winter. The production plant is 2755m ² and the living facilities are 1486m ² . In the winter heap leaching production process, the amount of gas used (there is room for calculation), the total gas consumption is 1.70t/h, so 2 sets of 2t boilers are used for heating.

Sixth, civil engineering

The total floor area of ​​the enterprise is 4241m ² . The production plant has secondary crushing workshop, extraction electric workshop, auto maintenance and repair workshop, integrated warehouse, finished product warehouse, automobile warehouse, oil depot, explosives warehouse, blasting equipment warehouse and other buildings, with a construction area of ​​2755m ² .行政及生活设施有办公室（包括化验室、医疗室、电话室）、单身宿舍、浴室、食堂等建筑物，其建筑面积为1486m ² 。

企业的构筑物有集液池、事故池、溶液池、高位料液池及高位水池等，其总容积约5万m ³ ，大部分构筑物为钢筋混凝土结构。

生产及辅助厂房均为一层建筑，采用砖混结构，屋面及屋架部分可以根据当地材料来选择，但萃取、电积各车间的地面、墙面和屋架要采用防酸处理。行政及生活设施除单身宿舍为二层外，其它均为一层建筑，其建筑形式可以根据当地习惯来选用。

第七章投资估算

一、本工程可行性研究投资估算额为2000万元。

其中土建工程685.93万元；设备及安装工程819.6万元；其它费用494.47万元。

工业厂房及行政生活福利建筑的单位造价，是根据当地一般建筑标准（每平方米400－650元）进行计算。

其它费用的计算：

建设单位管理费按生产费用总额的10%计算；

生产工人培训按20人培训6个月，每月500元付款；

林业占地按当地价格1000平方米300元计算补偿费；

电力增容费按每千伏安750元计算；

基本预备费按8%计算；

涨价预备金按建、安工程总额的0.6%计算；

环境评价费按0.3%计算；

本工程基建期为一年，贷款年利率为14.94%。

生产收入：1600万元/年；

生产成本：9500元/吨；

销售价格：16000元/吨；

税金：各项税款总额155万元/年；

实现利润：415万元/年；

投资利润率：11.75%；

投资利税率：23.11%；

基建贷款偿还期5.89年

税前全部投资回收期：6.42年

税前财务内部收益率：28.2%

税后全部投资回收期：6.46年

税后财务内部收益率：25.75%

二、服务年限

根据矿体储量计算，氧化矿可服务14年，硫化矿可服务37年。

第八章环境保护

一、1000吨电解铜厂位于黑龙江省嫩江县北部，由嫩呼公路北上164公里，折向东行10公里处，距铁路黑宝山站23公里。矿区附近主要河流为嫩江。

矿区地处寒温带，气温变化较大，春、夏、秋季较短，冬季漫长。

本区为农林区，居民稀少，大部分土地属荒地和丛林，附近工业极少，因而，环境质量较好。

二、烟尘、酸雾及治理措施

来自锅炉房的烟尘，经除尘处理后，达标排放，对环境不构成污染；破碎站的粉尘，除设备密闭外，用水喷雾降尘，以减小粉尘污染。

在采矿场，露天爆破将产生烟尘。在正常情况下，爆破后将产生含CO ₂ 、N ₂ 、NO ₂的烟尘；在特殊情况下，如炸药质量较差，将产生含NO、NO ₂的烟尘；在负氧平衡下，将产生含CO的烟尘。由于露天采矿场远离民在区，且该厂区环境质量比较好，因此，上述生产过程中所产生的烟尘，对环境不会构成污染。

在电解过程中将产生酸雾，为避免酸雾对大气的污染，在电解槽内覆盖一层高压聚乙烯粒料，以免电解槽酸雾的逸出。

矿石堆浸过程中，生产用水及冲洗残酸用水，流入备用液池，作为生产补充用水，废水不外排。

三、废渣及治理措施

采矿场剥离的废石，集中运到废石场堆放。

矿石分层堆浸，对最终的浸出渣用水冲洗残酸，直至矿渣堆中酸性水排完，最后可复土栽种植被。

四、噪声及控制

来自破碎站、采矿场及锅炉房的噪声可达90－117dB，由于矿区地处丛林地带，且远离村屯，噪声经远距离衰减，不会对周围环境造成影响。

第九章共伴生金属

多宝山铜矿是一个以铜钼为主的特大型有色金属矿床，其中含有金、银、 铼 、 硒 、铂、 钯 、 锇 、 铱等多种贵重金属矿产，这些矿产如应用到工业中去将会产生巨大的经济效益，其中，仅金属锇一项就达每克数万美元。但此次可行性研究以铜为主，在今后的开采过程中，对共伴生金属矿可采取指定的工业场地堆放，待科学技术逐步提高后再进行冶炼加工，使其达到较好的经济效益。

第十章经济及社会效益

本项目当年建成，第二年投产，年产电解铜1000吨，可增强省内铜的自供量，对黑龙江有色金属工业和黑河市的经济发展具有重要意义，同时对我国寒冷地区氧化铜矿石资源的开发和利用也将起到积极的推动作用。目前，国际市场铜的价格一直看好，建设该项目可有效拉动地方经济，安置社会剩余劳动力，给区域经济带来新的增长点。该项目具有资源可靠，产品畅销，投资回报快的特点。重要的是日前矿山建设的前期准备工作已基本就续。

综上所述，该项目投资少，风险小，效益好，前景广阔，是非常可行的。

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