A method for preparing high magnesium ammonium phosphate mineral salts, which is characterized by single or mixed acid-soluble acid with sulfuric acid made with calcium phosphate precalciner. After pre-decomposing the high-magnesium phosphate rock, after separation, the solid directly enters the phosphoric acid extraction system to obtain phosphoric acid, and the obtained wet-process phosphoric acid is prepared by a conventional method well known to those skilled in the art; the mother liquor after pre-decomposing the phosphate rock is chemically used. Precipitating phosphorus, magnesium, calcium and Other elements beneficial to crops, the terminal pH is 7.5 ~ 10.0, the substance after precipitation is mainly 枸 soluble fertilizer, this part of fertilizer can be mixed with ammonium phosphate to become a medium element (magnesium, calcium , sulfur, etc.) of multi-component fertilizer, product quality can reach the requirements of the first-class ammonium phosphate. Compared with the prior art, the invention can effectively utilize the high-magnesium medium-low grade phosphate rock in China to produce ammonium phosphate, etc.; at the same time, the pre-treatment work of the high-magnesium phosphate rock is saved, the phosphorus loss is reduced, and the total of the engineering device is greatly reduced. investment. Knurled Cap Nut,Thumb Screw Nut,Knurled Lock Nut,Thumb Nut Fastenal Kunshan Zhonggu Precision Hardware Co., Ltd. , https://www.zgfastener.com
Method for preparing ammonium phosphate salt from high magnesium phosphate rock