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A kind of preparation method of phosphogypsum whisker

A technology of phosphogypsum whiskers and phosphogypsum is applied in chemical instruments and methods, single crystal growth, single crystal growth and other directions, can solve the problems of difficult industrial application, high cost, complicated production process, etc., and achieves low cost and high elasticity. Modulus, the effect of simple preparation process

Active Publication Date: 2020-08-04
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned existing phosphogypsum pretreatment and calcium sulfate whisker preparation technology, the production process is complicated and the cost is high, which makes it difficult to apply industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] A kind of preparation method of phosphogypsum whisker, described preparation method is carried out according to the following steps:

[0024] a. Preprocessing

[0025] Mix deionized water, phosphogypsum, tributyl phosphate and concentrated sulfuric acid at a mass ratio of 20:5:2:2 to obtain a mixed solution. Stir and react at 200r / min for 1h at a constant temperature of 90°C, take out the static Set aside for 15 minutes, separate the tributyl phosphate and impurities in the upper layer, take the solution in the lower layer and perform suction filtration, wash the filter cake obtained after suction filtration with deionized water, and dry at 60°C for 2 hours to obtain pretreated phosphogypsum, which is ready for use .

[0026] b. Preparation of bacterial cellulose dispersion

[0027] Soak the bacterial cellulose membrane in a sodium hydroxide solution with a mass fraction of 1% to 4%, the temperature of the sodium hydroxide solution is 70 to 90°C, and after soaking for...

Embodiment 1

[0035] a. Preprocessing

[0036]Mix deionized water, phosphogypsum, tributyl phosphate and concentrated sulfuric acid at a mass ratio of 20:5:2:2 to obtain a mixed solution. Stir and react at 200r / min for 1h at a constant temperature of 90°C, take out the static Set aside for 15 minutes, separate the tributyl phosphate and impurities in the upper layer, take the solution in the lower layer and perform suction filtration, wash the filter cake obtained after suction filtration with deionized water, and dry at 60°C for 2 hours to obtain pretreated phosphogypsum, which is ready for use .

[0037] b. Preparation of bacterial cellulose dispersion

[0038] The bacterial cellulose membrane is soaked in a sodium hydroxide solution with a mass fraction of 1%, and the temperature of the sodium hydroxide solution is 90° C. After soaking for 3 hours, the bacterial cellulose membrane after the soaking treatment is cleaned with deionized water, and then Dry at 60°C for 2h. Weigh the dried...

Embodiment 2

[0042] a. Preprocessing

[0043] Mix deionized water, phosphogypsum, tributyl phosphate and concentrated sulfuric acid at a mass ratio of 20:5:2:2 to obtain a mixed solution. Stir and react at 200r / min for 1h at a constant temperature of 90°C, take out the static Set aside for 15 minutes, separate the tributyl phosphate and impurities in the upper layer, take the solution in the lower layer and perform suction filtration, wash the filter cake obtained after suction filtration with deionized water, and dry at 60°C for 2 hours to obtain pretreated phosphogypsum, which is ready for use .

[0044] b. Preparation of bacterial cellulose dispersion

[0045] Soak the bacterial cellulose membrane in a sodium hydroxide solution with a mass fraction of 4%, and the temperature of the sodium hydroxide solution is 70°C. After soaking for 2 hours, the bacterial cellulose membrane after the soaking treatment is cleaned with deionized water, and then Dry at 60°C for 2h. Weigh the dried bact...

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Abstract

The invention relates to a preparation method of calcium sulfate whiskers and belongs to the technical field of inorganic material preparation. Ardealite is used as a raw material and pretreated witha mixed solution of tributyl phosphate and sulfuric acid; a crystal form regulating agent and pretreated ardealite are added to a bacterial cellulose dispersion liquid to react, and the mixed solutionobtained after the reaction is subjected to suction filtration, washing and drying. The preparation method is simple, the effects of impurities on production of calcium sulfate whiskers can be reduced effectively, the reaction time can be shortened, the problems that the calcium sulfate whiskers are low in yield and cannot be produced under a low-pressure condition in the prior art are solved, and the production cost of production of the calcium sulfate whiskers through comprehensive utilization of ardealite is reduced.

Description

Technical field: [0001] The invention relates to a method for preparing phosphogypsum whiskers, which belongs to the technical field of inorganic material preparation. Background technique [0002] Phosphogypsum is an industrial by-product mainly composed of calcium sulfate dihydrate, which is discharged by phosphorus chemical enterprises during the production of ammonium phosphate fertilizer or wet process production of phosphoric acid. With the continuous increase of gypsum production, the accumulated phosphogypsum has a great destructive effect on the local environment; in recent years, in order to fundamentally solve the problem of increasing phosphogypsum, phosphogypsum crystals with high cost performance Whiskers have gradually attracted the attention of some scientific research institutions and manufacturers. Predecessors have carried out a lot of research on the pretreatment method of phosphogypsum and the preparation of whiskers. [0003] At present, domestic and f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B7/14
CPCC30B7/14C30B29/46
Inventor 许杰陈泽琦柏自奎包海峰徐卫林
Owner WUHAN TEXTILE UNIV