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Method for preparing calcium sulfate hemihydrate crystal whisker by ardealite

A technology of calcium sulfate hemihydrate and calcium sulfate dihydrate, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as large environmental impact, serious equipment corrosion, long crystallization reaction time, etc., and achieve reduction The impact of environment and equipment, the large aspect ratio of whiskers, and the effect of saving consumption

Active Publication Date: 2016-02-24
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires a large amount of acid leaching, which seriously corrodes the equipment and takes a long time for the crystallization reaction. At the same time, the product obtained later has a low pH and requires a large amount of process water for washing, which has a great impact on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0031] Get 200g of phosphogypsum produced by the phosphoric acid plant of Yunnan Tian'an Chemical Co., Ltd., the mineral chemical composition is:

[0032] main ingredient

Calcium sulfate dihydrate (%)

Silica (%)

BaiDu

analysis results

83.26

13.76

83.4

[0033] Add 600g of process water to make the concentration of phosphogypsum slurry 25%. After 1 roughing and 2 times of beneficiation, 156g of refined phosphogypsum with a grade of calcium sulfate dihydrate of 97.22% and a grade of silicon dioxide of 1.65% are obtained. Take the refined phosphogypsum Place it in a muffle furnace for calcination, the calcination temperature is 140°C, and the calcination time is 4h. Add 600g of process water to the calcined hemihydrate gypsum for stirring, washing and activation, and stir for 1h. The pH of the filtrate is 5.20. Take 50g of the phosphogypsum after washing and activation. Add 950g of process water to make a slurry with a solid mass co...

Embodiment example 2

[0036] Get 200g of phosphogypsum in the phosphogypsum storage yard of Yunnan Tian'an Chemical Co., Ltd., the mineral chemical composition is:

[0037] main ingredient

Calcium sulfate dihydrate (%)

Silica (%)

BaiDu

analysis results

73.46

26.33

73.4

[0038] Add 800g of process water to make the concentration of phosphogypsum slurry 20%. After 1 roughing and 2 times of beneficiation, 138g of refined phosphogypsum with a grade of calcium sulfate dihydrate of 97.82% and a grade of silicon dioxide of 1.35% are obtained. Take the refined phosphogypsum Place it in a muffle furnace for calcination, the calcination temperature is 160°C, and the calcination time is 6h. Add 800g of process water to the calcined hemihydrate gypsum for stirring, washing and activation, and stir for 1h. The pH of the filtrate is 5.80. Take 50g of the phosphogypsum after washing and activation. Add 1616g of process water to make a slurry with a solid mass conce...

Embodiment example 3

[0041] Get 200g of phosphogypsum in the phosphogypsum storage yard of Yunnan Tian'an Chemical Co., Ltd., the mineral chemical composition is:

[0042] main ingredient

Calcium sulfate dihydrate (%)

Silica (%)

BaiDu

analysis results

85.66

12.56

84.6

[0043] Add 600g of process water to make the concentration of phosphogypsum slurry 25%. After one roughing and one beneficiation, 138g of refined phosphogypsum with a grade of calcium sulfate dihydrate of 95.44% and a grade of silicon dioxide of 1.95% are obtained. Take the refined phosphogypsum Place it in a muffle furnace for calcination, the calcination temperature is 150°C, and the calcination time is 5h. Add 1000g of process water to the calcined hemihydrate gypsum for stirring, washing and activation, and stir for 1h. The pH of the filtrate is 6.20. Take 50g of the phosphogypsum after washing and activation. Add 950g of process water to make a slurry with a solid mass concentrat...

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Abstract

The invention relates to a method for preparing a calcium sulfate hemihydrate crystal whisker by ardealite. The adopted ardealite calcium sulfate dihydrate is low in grade, wide in source, and is not needed to be subjected to acid treatment impurity removal; by simple flotation desilicication, the grade of ardealite is improved and a large quantity of impurities are removed; the calcium sulfate hemihydrate crystal whisker is prepared by calcination, washing excitation, and thermal hydraulic pressure process. The process flow is simple; the raw materials are wide in source; the production cost is low; impact on environment is small; the obtained calcium sulfate hemihydrate crystal whisker has the characteristics of high purity, large length-diameter ratio, uniform shape, stable crystalline form and the like, and has relatively good industrial application value.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate hemihydrate whiskers from phosphogypsum, and belongs to the technical field of comprehensive utilization of industrial solid waste resources. Background technique [0002] Phosphogypsum is a by-product of the wet process of phosphoric acid production. With the increasing demand for high-concentration phosphorus compound fertilizers at home and abroad, the development of the wet-process phosphoric acid industry has been promoted, and more phosphogypsum has also been produced. At the same time, with the increasing demand for phosphate rock resources in the phosphorus chemical industry and the continuous consumption of rich ore, the phosphoric acid plant has a great impact on the raw material P of phosphate rock. 2 o 5 The grade is getting lower and lower, the range of impurity content is getting higher and higher, and the grade of the phosphogypsum produced is also gradually decreasing. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/62C30B29/46
Inventor 朱鹏程王国栋罗鸣坤刘文彪
Owner YUNNAN CHEM RES INST
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