Method of efficiently cleaning hydrochloric-acid-process wet-process phosphoric acid

A technology of wet-process phosphoric acid and hydrochloric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high defluorination cost and low impurity removal efficiency, and achieve excellent defluorination effect, easy filtration, and reduced Effect of major impurity content

Active Publication Date: 2019-05-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the technical deficiencies of high defluorination cost and low impurity removal efficiency of wet-process phosphoric acid at the present stage, and provides a method for efficient impurity removal of hydrochloric acid wet-process phosphoric acid

Method used

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  • Method of efficiently cleaning hydrochloric-acid-process wet-process phosphoric acid
  • Method of efficiently cleaning hydrochloric-acid-process wet-process phosphoric acid
  • Method of efficiently cleaning hydrochloric-acid-process wet-process phosphoric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic substance V (1.84g of 40% HF), inorganic substance II (2.66g of aluminum sulfate octadecahydrate), inorganic substance III (0.32g of silicon dioxide), inorganic substance IV (98% concentrated sulfuric acid 0.88g) is placed in the beaker that fills 166.19g distilled water, after it dissolves, add inorganic substance I (calcium oxide 7.0g), control reaction temperature is 30 ℃, stirring speed is 160r / min, reaction After 12 hours, filter, wash, and dry the precipitate to obtain 0.33 g of white precipitate. F, CaO, and Al in the wet-process phosphoric acid after the reaction 2 o 3 and SiO 2 The removal rates were 14.99%, 8.28%, 13.62%, 6.87%.

Embodiment 2

[0053] Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic substance V (1.84g of 40% HF), inorganic substance II (2.66g of aluminum sulfate octadecahydrate), inorganic substance III (0.32g of silicon dioxide), inorganic substance IV (98% concentrated sulfuric acid 0.88g) is placed in the beaker that fills 163.19g distilled water, after it dissolves, add inorganic matter I (calcium oxide 10.0g), control reaction temperature is 30 ℃, stirring speed is 160r / min, reaction After 12 hours, filter, wash, and dry the precipitate to obtain 0.68 g of white precipitate. F, CaO, and Al in the wet-process phosphoric acid after the reaction 2 o 3 and SiO 2 The removal rates were 29.98%, 11.82%, 19.45%, 9.81%.

Embodiment 3

[0055] Take a 500mL beaker, weigh 21.11g of 85% phosphoric acid, inorganic substance V (1.84g of 40% HF), inorganic substance II (2.66g of aluminum sulfate octadecahydrate), inorganic substance III (0.32g of silicon dioxide), inorganic substance IV (98% concentrated sulfuric acid 0.88g) is placed in the beaker that fills 155.51g distilled water, after it dissolves, add inorganic matter I (calcium oxide 17.68g), control reaction temperature is 30 ℃, and stirring speed is 160r / min, reaction After 12 hours, filter, wash, and dry the precipitate to obtain 1.35 g of white precipitate. F, CaO, and Al in the wet-process phosphoric acid after the reaction 2 o 3 and SiO 2 The removal rates were 61.64%, 4.16%, 55.79%, 28.13%.

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Abstract

The invention relates to a method of efficiently cleaning hydrochloric-acid-process wet-process phosphoric acid. The method comprises adding one or any of calcium-bearing inorganics, aluminum-bearinginorganics, silicon-bearing inorganics, sulfur-bearing inorganics and fluorine-bearing inorganics into the hydrochloric-acid-process wet-process phosphoric acid, adjusting the molar ratio of Ca, Al, Si, S and F in the hydrochloric-acid-process wet-process phosphoric acid to (20-50):(0.8-1.2):(1-1.20):(0.90-1.20):(12-15), and allowing to react so that impurity elements, Ca, Al, Si, S and F, in thehydrochloric-acid-process wet-process phosphoric acid are precipitated out in the form of Ca4AlSiSO4F13 12H2O so that purifying is achieved. Compared with the prior art, the method has the advantagesthat the five impurity elements in the wet-process phosphoric acid are removed at a time by changing the composition of the wet-process phosphoric acid, the main impurity elements in the wet-process phosphoric acid are precipitated out in the form of the compound Ca4AlSiSO4F13 12H2O, and therefore, purification of the wet-process phosphoric acid is achieved.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid treatment, and in particular relates to a method for efficiently removing impurities by hydrochloric acid wet-process phosphoric acid. Background technique [0002] The purification technology of wet-process phosphoric acid mainly includes ion exchange method, electrodialysis method, crystallization method, membrane separation method, chemical precipitation method, solvent precipitation method, solvent extraction method-chemical precipitation method combined process, etc. However, the most widely used and most economical method in production is the chemical precipitation method, that is, the two-stage neutralization method. Calcium, fluorine, aluminum, magnesium, silicon and sulfur are the main impurities in wet-process phosphoric acid, which can be effectively purified by two-stage neutralization, and the process is relatively mature and the quality is stable, but the disadvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C01B25/238
Inventor 武斌黄飞舟陈葵马强何丰
Owner EAST CHINA UNIV OF SCI & TECH
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