Method for preparing calcium hydrophosphate through double-acidolysis of phosphorite

[0016] Step A: Production of ore pulp: crush the phosphate rock with a phosphorus content of 28% in a crusher, and make pulp through a ball mill to obtain a phosphate rock pulp, which is matured in a maturation pool for 1 day.

[0017] Step B hydrochloric acid acid hydrolysis reaction: add hydrochloric acid to the phosphate rock slurry in the extraction tank to fully react the hydrochloric acid;

[0018] Step C Sulfuric Acid Hydrolysis Reaction: After fully reacting with hydrochloric acid, add sulfuric acid at a concentration of 50%, filter through a filter after fully reacting to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of polypropylene The coagulation precipitating agent of amine press, obtains phosphoric acid liquid 1, wherein the mol ratio of hydrochloric acid in the step B and the sulfuric acid in the step C is 1:2;

[0019] Step D, one-stage neutralization: put the phosphoric acid solutio

[0025] Step A: Production of ore pulp: Crushing the phosphate rock with a phosphorus content of 25% in a crusher, pulping it through a ball mill to obtain a phosphate rock pulp, and maturing it in a maturation pool for 1.5 days.

[0026] Step B hydrochloric acid acid hydrolysis reaction: add hydrochloric acid to the phosphate rock slurry in the extraction tank to fully react the hydrochloric acid;

[0027] Step C Sulfuric Acid Hydrolysis Reaction: Add sulfuric acid with a concentration of 65% after fully reacting with hydrochloric acid, filter through a filter after fully reacting to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of polypropylene The coagulation precipitating agent of amine press, obtains phosphoric acid liquid 1, wherein the mol ratio of hydrochloric acid in the step B and the sulfuric acid in the step C is 1:3;

[0028] Step D, one-stage neutralization: put the phosphoric acid solu

[0034] Step A: Production of ore pulp: Crushing the phosphate rock with a phosphorus content of 22% in a crusher, pulping it through a ball mill to obtain a phosphate rock pulp, and maturing it in a maturation pool for 2 days.

[0035] Step B hydrochloric acid acid hydrolysis reaction: add hydrochloric acid to the phosphate rock slurry in the extraction tank to fully react the hydrochloric acid;

[0036] Step C Sulfuric Acid Hydrolysis Reaction: Add 80% sulfuric acid after fully reacting with hydrochloric acid, filter through a filter after fully reacting to obtain phosphogypsum and filtrate, discharge the filtrate into the phosphoric acid sedimentation tank, and add a certain amount of polypropylene The coagulation precipitating agent of amine press, obtains phosphoric acid liquid 1, wherein the mol ratio of hydrochloric acid in the step B and the sulfuric acid in the step C is 1:4;

[0037] Step D, one-stage neutralization: put the phosphoric acid solution 1 into the reaction t