1. The ore dressing method for beneficiation and purification of talc is as follows 1. Flotation Because the natural floatability of talc is good, the hydrocarbon oil collector can be floated. The collector used is kerosene, oil as flotation frother. The foam produced by methyl isobutyl methoxide (MIBC) is brittle and easy to obtain high quality concentrate. The talc flotation process is relatively simple, and only one rough selection, one sweep, and two to four selections can be used to obtain the final concentrate. 2, hand player selection is based on the slippery nature of talc and gangue minerals by hand. Talc has good slipperiness, the higher the grade, the better the slipperiness, and it is easy to identify by hand. Most of the talc mines in China use hand-selected high-grade talc blocks. 3, the electrostatic talc ore beneficiation addition to talc, also contains magnesite, a magnetic iron ore, magnetic pyrite, tremolite and other minerals, disseminated grain size of approximately 0.5mm. Talc negative charge in the electrostatic field, magnesite ore belt positive charge, while magnetite and iron are good conductors stream, thus it is easy to separate the electric field above mineral. 4. Magnetically selected talc concentrates must have a certain degree of fineness in addition to a certain degree of fineness. Due to the presence of dyed iron minerals in the ore, sometimes the above method is not sufficient, and magnetic separation is required to remove the iron mineral. Wet magnetic separation can reduce the iron content of talc concentrate from 4% to 5% to less than 1%. 5. Photoelectric detection Photoelectric detection is a method of sorting by utilizing the different optical properties of talc and impurity minerals. Photoelectric sorters include preparation mechanisms (mines, feeders, belt conveyors), radiation sources and detectors (sensors), Electronic Control loops, and actuators. In addition, the use of talc to emit white fluorescence under ultraviolet light can be used to pick out pure talc using a photoelectric sorter. Generally, the labor Turks 621 type optical sorting machine is used. For example, the tussah company of the United States has used this method to enrich the lean ore with a talc content of 30% into a rich ore with a talc content of 69%, and finally grind to 200 mesh for flotation. , get 99% cosmetic grade talc. 6. Selective crushing and sieving The difference in selective crushing and shape between talc and gangue minerals can be separated by impact crushing and alternating rectangular sieves and square sieves to separate most of the associated quartz and More than half of the carbonate minerals. Second, fine grinding and ultra-fine grinding Talc is ultimately applied in powder form, so fine grinding and ultra-fine grinding are the processing techniques necessary for talc. Talc has a Mohs hardness of 1, which is naturally breakable and grindable. The fine grinding of talc is generally carried out in various types (ie, suspended roll grinding) in China. It mainly produces 200 mesh and 325 mesh products, but if fine graded equipment is installed , it can also produce 500 to 1250 mesh products. Ultra-fine talcum powder is one of the most used ultra-fine powder products in the world, widely used in paper, plastic, rubber, paints, cosmetics, ceramics and so on. At present, the processing of ultrafine talcum powder mainly adopts a dry process. Although wet pulverization has been studied, it is rarely used in industry. Dry production equipment mainly includes high-speed mechanical impact mills, jet mills, centrifugal self-grinding mills , rotary mills, and vibration mills, mixer mills and tower mills. In addition to the jet mill, in order to meet the user's requirements for particle size distribution, other grading equipment generally needs to be equipped with subdivision equipment. The commonly used fine grading equipment is various turbine air centrifugal classifiers, such as MS type, MSS type, ATP. Type, LHB type, etc. The principle of airflow crushing of talc is as follows: Talc - coarse crush - dry - medium crush - fine grinding (Raymond mill) - super fine crushing (air jet mill) - cyclone aggregate - packaging The production process is roughly as follows: the talc is first sent to the hammer by the feeder for crushing; the crushed material is dried by the Bucket Elevator and the vibrating feeder into the vertical dryer; the dried material is hammered again . After the crusher is broken, it enters the Raymond mill and finely ground the talc powder into the jet mill for ultrafine crushing. The final product fineness can reach 500-5000 mesh (d97=30-5um). The jet mills used in the industry include disc-type jet mills, fluidized bed-to-jet jet mills, circulating tubular jet mills, and the like. The high-speed mechanical impact superfine pulverization process of talc is as follows: Talc-crushing (hammer crusher )-high-speed mechanical impact type superfine pulverizer-turbine fine classifier-cyclone aggregate-packaging is generally used to directly break into the mechanical impact type after the talc is crushed to 8mm. The pulverizer, the pulverized product was classified by a turbo fine classifier and then collected by a cyclone collector. The graded fine-grained product can be returned to the mill or used as a separate product. The centrifugal self-grinding of the talc and the ultrafine grinding process of the rotary mill are generally similar to the high-speed mechanical impact superfine grinding process. Third, surface modification Talc is widely used as a reinforcing filler for polymer-based composites such as polypropylene and nylon. Surface modification can effectively improve the affinity of talc powder with polymer and the dispersion state of talc filler in polymer matrix, thereby improving the physical and mechanical properties of the composite. Surface modification using surface modifying agent Talc mainly various surfactants, paraffin, aluminum salts and zirconium titanate coupling agent, silane coupling agent, phosphorus acid ester and the like. The modification mainly adopts a dry modification process. The modification machine mainly includes a continuous type and a fluidization modification machine, a continuous vortex type powder surface modification machine (SLG type), a high-speed heating mixing kneader and the like. Fourth, calcination The Guangfeng area of ​​Jiangxi Province in China is rich in black talc resources. The reason is that some talc mines contain more organic carbon. In order to exploit these black talc resources, calcination is a necessary process. The calcination temperature is generally 600 to 1200 ° C. In this temperature range, the higher the temperature, the higher the whiteness of the talc after calcination, and the whiteness of calcination is up to 90% or more. At present, most of the calcining equipments use a shuttle kiln, a tunnel kiln and a rotary kiln. Wood Pellet Production Line Wood Pellet Production Line,Wood Pellet Machine,Wood Pellet Line XinxiangHexie Feed Machienry Manufacturing Co.Ltd , https://www.hxfeedmill.com
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Lemen grinding talc beneficiation purification and processing technology