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Method for producing phosphoric acid with low and medium grade phosphorous mine ore

A phosphate rock, low-grade technology, applied in phosphoric acid, phosphorus oxyacid and other directions, can solve the problem of not fully disclosing the structural characteristics and implementation conditions of special reactors, and achieves reduction of P2O5 loss, improvement of utilization rate, and good economic benefits. Effect

Inactive Publication Date: 2005-10-19
CHENGYUAN CHEM SICHUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of this invention is to produce dibasic calcium phosphate from low- and medium-grade phosphate rocks, and some progress has been made in overcoming the defects in the existing technology of dibasic calcium phosphate production. Reactor Structural Features and Implementation Conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select with P 2 o 5 The calculated phosphorus content is 17.47% by weight. The Cambrian "Qingping-type" phosphate rock phosphate rock is first crushed with a hammer, and then ground with an agate mortar until the particle size of the phosphate rock powder is -100 mesh, and then weighed This phosphate rock powder 57 grams, take P 2 o 5 The total phosphorus content is 900 grams of 22% by weight phosphoric acid aqueous solution, the liquid-solid ratio of the phosphoric acid aqueous solution and the phosphate rock powder is 15.8, and the acid hydrolysis reaction is carried out at a temperature of 75 ° C and a stirring intensity of 5 m / s for 2.0 hours , after the completion of the acidolysis reaction, vacuum filtration was used to obtain 23 grams of residue (dry basis), and the obtained filtrate carried out neutralization and crystallization reaction with 24 grams of 98% by weight sulfuric acid at a temperature of 80 ° C to generate calcium sulfate The hydrate was precipi...

Embodiment 2

[0031] Select with P 2 o 5 The calculated phosphorus content is 17.47% by weight. The Cambrian "Qingping-type" phosphate rock phosphate rock is first crushed with a hammer, and then ground with an agate mortar until the particle size of the phosphate rock powder is -100 mesh, and then weighed This phosphate rock powder 67 grams, take P 2 o 5 The total phosphorus content is 900 grams of 22% by weight phosphoric acid aqueous solution, the liquid-solid ratio of the phosphoric acid aqueous solution and the phosphate rock powder is 13.4, and the acid hydrolysis reaction is carried out for 3.0 hours under stirring at a stirring intensity of 4 m / s at a temperature of 75° C. , after the completion of the acidolysis reaction, vacuum filtration was used to obtain 28 grams of residue (dry basis), and the resulting filtrate carried out neutralization and crystallization reaction with 30 grams of 98% by weight sulfuric acid at a temperature of 80 ° C to generate calcium sulfate The hydr...

Embodiment 3

[0033] Select with P 2 o 5 The calculated phosphorus content is 19.43% by weight. The Cambrian "Qingping-style" phosphate rock phosphate rock is first crushed with a hammer, and then ground with an agate mortar until the particle size of the phosphate rock powder is -200 mesh, and then weighed This phosphate rock powder 69 grams, take P 2 o 5 The total phosphorus content is 790 grams of 23.12% by weight phosphoric acid aqueous solution, the liquid-solid ratio of the phosphoric acid aqueous solution and the phosphate rock powder is 11.4, at a temperature of 80 ° C, stirring at a stirring intensity of 3 m / s to carry out the acid hydrolysis reaction for 4.0 hours , after the completion of the acidolysis reaction, vacuum filtration was used to obtain 34 grams of residue (dry basis), and the obtained filtrate carried out neutralization and crystallization reaction with 39 grams of 98% by weight sulfuric acid at a temperature of 70 ° C to generate calcium sulfate The hydrate was ...

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Abstract

The present invention relates to method of producing phosphoric acid with low and medium grade phosphorous ore. The low and medium grade phosphorous ore is used to produce phosphoric acid through the acidifying reaction with water solution of phosphoric acid, solid-liquid separation and phosphoric acid crystallization reaction. The method has the advantages of high phosphoric acid purity and low production cost.

Description

【Field of Invention】 [0001] The invention relates to a method for producing phosphoric acid by using phosphate rock, more specifically, the present invention relates to a method for producing phosphoric acid by using medium and low grade phosphate rock. 【Background technique】 [0002] Phosphoric acid is one of the three most important basic acids used in the chemical industry. It can be widely used in the manufacture of various phosphates, widely used as electroplating polishing agents, steel rust inhibitors, printing industry detergents, organic synthesis catalysts, and also widely used in detergents, paints, medicines, water treatment, metal surfaces Processing, rubber, feed, building materials, plastic additives, food and other industries. Wet process phosphoric acid is a basic production method for preparing phosphoric acid. At present, the industrial production of phosphoric acid mainly adopts the dihydrate method and the hemihydrate method. Since wet-process phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/22
Inventor 王卫安许文卫陈栋梁龚华杨林
Owner CHENGYUAN CHEM SICHUAN
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