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.
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