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Method for preparing calcium sulfate whisker from titanium gypsum

A technology of calcium sulfate whiskers and titanium gypsum, applied in the preparation of calcium sulfate whiskers, in the field of preparing calcium sulfate whiskers from titanium gypsum, can solve the problems of occupying large land resources, large discharge of titanium gypsum, and polluting the environment, and achieve The effect of low production cost, realization of reuse and simple operation

Inactive Publication Date: 2019-01-08
XICHANG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method for preparing calcium sulfate whiskers from titanium gypsum, aiming at problems such as large discharge of titanium gypsum, occupation of a large amount of land resources, and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve titanium gypsum with a certain concentration of hydrochloric acid, filter, adjust the pH of the solution, and purify to obtain relatively pure titanium gypsum, then make it into a slurry with a mass fraction of 2.0%, pour it into an autoclave, and pour it into the kettle Then add admixture (glycerol), crystal growth agent (MgSO 4 ) carry out hydrothermal reaction, wherein, the volume consumption of glycerol accounts for 20% of the volume of slurry, MgSO 4 The molar concentration is 0.05mol / L, the hydrothermal reaction time is 6h, and the hydrothermal reaction temperature is 120°C. Filtrate while hot, wash and dry to obtain calcium sulfate whiskers with an aspect ratio of about 25.

Embodiment 2

[0020] Dissolve titanium gypsum with a certain concentration of hydrochloric acid, filter, adjust the pH of the solution, and purify to obtain relatively pure titanium gypsum, then make it into a slurry with a mass fraction of 2.5%, pour it into an autoclave, and pour it into the kettle Then add admixture (glycerol), crystal growth agent (MgSO 4 ) carry out hydrothermal reaction, wherein, the volume consumption of glycerol accounts for 10% of the volume of slurry, MgSO 4 The molar concentration is 0.1mol / L, the hydrothermal reaction time is 10h, and the hydrothermal reaction temperature is 120°C. Filtrate while hot, wash and dry to obtain calcium sulfate whiskers with an aspect ratio of about 40.

Embodiment 3

[0022] Dissolve titanium gypsum with a certain concentration of hydrochloric acid, filter, adjust the pH of the solution, and purify to obtain relatively pure titanium gypsum, and then make it into a slurry with a mass fraction of 5%, pour it into an autoclave, and pour it into the kettle Then add admixture (glycerol), crystal growth agent (MgSO 4 ) carry out hydrothermal reaction, wherein, the volume consumption of glycerol accounts for 30% of the volume of slurry, MgSO 4 The molar concentration is 0.01mol / L, the hydrothermal reaction time is 10h, and the hydrothermal reaction temperature is 120°C. Filter while hot, wash and dry to obtain calcium sulfate whiskers with an aspect ratio of about 36.

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Abstract

The invention discloses a method for preparing a calcium sulfate whisker from titanium gypsum. The method comprises the following steps: first, purifying the titanium gypsum to obtain pure white titanium gypsum; then preparing the pure white titanium gypsum into slurry with a certain mass fraction, pouring the slurry into an autoclave, adding an admixture and a crystal promoter and carrying out ahydrothermal reaction under certain conditions; after the reaction ends, filtering while hot, washing and drying to obtain the calcium sulfate whisker. According to the method disclosed by the invention, the calcium sulfate whisker is prepared by using industrial by-product titanium gypsum produced in the production process of titanium dioxide by a sulfuric acid method as a raw material; a high value-added calcium sulfate whisker product can be obtained; in addition, a new method for treating a large amount of stacked titanium gypsum is provided for enterprises to produce the titanium dioxideby the sulfuric acid method; the hazards of the titanium gypsum to the environment are reduced and the utilization value of the titanium gypsum in the future market is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for preparing calcium sulfate whiskers, in particular to a method for preparing calcium sulfate whiskers from titanium gypsum. Background technique [0002] Calcium sulfate whisker is a fibrous single crystal of calcium sulfate. It is a fibrous sub-nanometer material with uniform cross-section, complete shape and perfect internal structure. Calcium Sulfate Whiskers Three. Calcium sulfate whisker is a new type of material, which can be used as reinforcing material, friction material, asphalt modified material, structural adhesive material, etc. Its preparation methods include hydrothermal method, atmospheric pressure acidification method, crystallization method, microemulsion method, etc. At present, the hydrothermal method is commonly used, the process is simple, the production conditions are not high, and the operation is easy. [0003] In the production proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B7/10
CPCC30B7/10C30B29/46C30B29/62
Inventor 刘洪朱静平张婷婷靳必强何元香刘桎鹏解蜀郑茂浩
Owner XICHANG COLLEGE
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