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A conversion and purification method of low-consumption dihydrate phosphogypsum

A technology of phosphogypsum dihydrate and purification method, which is applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve the problems of low quality phosphogypsum, small processing capacity, secondary pollution, etc., and achieve production Low environmental pollution, mild reaction conditions, and high conversion efficiency

Active Publication Date: 2022-04-15
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned schemes can partially alleviate the current situation of a large amount of phosphogypsum stockpiling, but there are still many problems, some of which will cause secondary pollution, and the purity of phosphogypsum as a by-product is not high and contains many impurities. Some phosphogypsum processing processes include lime neutralization, water washing, calcination and steam treatment, etc. Although these treatment processes can eliminate the adverse effects of some harmful impurities to a certain extent, the treatment process requires large investment, high energy consumption, and small processing capacity. , secondary pollution is difficult to solve, and the quality of phosphogypsum after treatment is still low

Method used

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  • A conversion and purification method of low-consumption dihydrate phosphogypsum
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  • A conversion and purification method of low-consumption dihydrate phosphogypsum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Weigh 100 parts by weight of phosphogypsum dihydrate and 100 parts by weight of water, and add 10 parts by weight of sodium polyepoxysuccinate decomposition agent, place it in a wet grinding tank, add zirconia balls, and the ball material The ratio is 5:1, and the wet grinding time is 1 hour; take out the wet-milled pellets and mix the slurry, and pass through a sieve with a diameter of 0.6mm to obtain superfine slurry A.

[0032] Step 2: Take 100 parts by weight of slurry A, add 200 parts by weight of ammonium sulfate solution with a concentration of 30%, perform sufficient mechanical stirring to promote dissolution, let stand for 1 hour, and take the upper layer of slurry B.

[0033] Step 3: Take 100 parts by weight of slurry B, 400 parts by weight of polyethylene glycol and 10 parts by weight of Triton 100, stir evenly, and mix thoroughly for 2 hours.

[0034] Step 4: Add 100 parts by weight of a mixed solution of saturated calcium hydroxide aqueous solution ...

Embodiment 2

[0037] Step 1: Weigh 100 parts by weight of phosphogypsum dihydrate and 200 parts by weight of water, add 10 parts by weight of sodium polyacrylate decomposing agent, place it in a wet grinding tank, add zirconia balls, and its ball-to-material ratio is 5 : 1, the wet milling time is 1h; take out the ball material mixed slurry after wet milling, and pass through a sieve whose sieve hole is 0.6mm in diameter to obtain superfine slurry A.

[0038] Step 2: Take 100 parts by weight of slurry A, add 250 parts by weight of ammonium chloride solution with a concentration of 30%, perform sufficient mechanical stirring to promote dissolution, let stand for 2 hours, and take the upper layer of slurry B.

[0039] Step 3: Take 100 parts by weight of slurry B, 400 parts by weight of n-hexane and 10 parts by weight of Tween 20, stir evenly, and mix thoroughly for 3 hours.

[0040] Step 4: Add 100 parts by weight of a mixed solution of saturated calcium hydroxide aqueous solution and ethanol...

Embodiment 3

[0043] Step 1: Weigh 100 parts by weight of phosphogypsum dihydrate and 200 parts by weight of water, add 15 parts by weight of sodium polyacrylate decomposing agent, place it in a wet grinding tank, add zirconia balls, and its ball-to-material ratio is 8 : 1, the wet milling time is 1h; take out the ball material mixed slurry after wet milling, and pass through a sieve whose sieve hole is 0.6mm in diameter to obtain superfine slurry A.

[0044]Step 2: Take 100 parts by weight of slurry A, add 300 parts by weight of ammonium acetate solution with a concentration of 30%, perform sufficient mechanical stirring to promote dissolution, let stand for 2 hours, and take the upper layer of slurry B.

[0045] Step 3: Take 100 parts by weight of slurry B, 500 parts by weight of ethyl acetate and 20 parts by weight of Span 20, stir evenly, and mix thoroughly for 4 hours.

[0046] Step 4: Add 150 parts by weight of a mixed solution of saturated calcium hydroxide aqueous solution and ethan...

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Abstract

The invention discloses a conversion and purification method of low-consumption dihydrate phosphogypsum. Water and an appropriate amount of decomposing agent are firstly added to the industrial by-product dihydrate phosphogypsum, and slurry treatment is carried out through a wet grinding process, and then sieved to remove large particles. Mix balls, add ammonium salt solution to the obtained slurry, fully mechanically stir, stand still to take the upper layer slurry, add organic solvent and surfactant to the upper layer slurry, make the upper layer slurry fully mix with it, and then add saturated calcium hydroxide A mixture of aqueous solution and ethanol, the obtained mixture is suction-filtered, washed with ethanol, separated and dried to obtain purified phosphogypsum hemihydrate. The invention utilizes the method combining physics and chemistry to prepare hemihydrate phosphogypsum with higher purity. The invention has the characteristics of low energy consumption, low operating cost, green environmental protection, high product purity, etc., solves the problem of comprehensive utilization of phosphogypsum, is a new idea for resource utilization of phosphogypsum, and opens up a new way for its subsequent comprehensive utilization.

Description

technical field [0001] The invention relates to the field of resource utilization of phosphogypsum, in particular to a conversion and purification method of low-consumption dihydrate phosphogypsum. Background technique [0002] Phosphogypsum is a solid by-product discharged during the production of wet-process phosphoric acid, and about 90% of phosphogypsum is a by-product of the dihydrate wet-process phosphoric acid process. For every 1t of wet-process phosphoric acid produced (in P 2 o 5 Calculated), the by-product phosphogypsum is about 4~5t. At present, the annual output of phosphogypsum in the world is about 200 million tons, and the annual output in my country is more than 50 million tons. The annual comprehensive utilization is about 10 million tons, and the comprehensive utilization rate is only 20%. So far, the accumulated storage of phosphogypsum in my country has exceeded 200 million tons, which not only occupies land and wastes resources, but also brings serio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46
CPCC01F11/468C01F11/466C01P2006/80
Inventor 贺行洋李韦龙陈顺苏英熊国庆黄震宇刘巧徐慧张博王迎斌王传辉
Owner HUBEI UNIV OF TECH