Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum

A technology of calcium sulfate whisker and desulfurization gypsum, which is applied in separation methods, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of insufficient utilization of desulfurization gypsum, etc., and achieves low production cost and ease of use. The effect of dyeing environment and short process flow

Inactive Publication Date: 2008-11-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research and application development of desulfurized gypsum in my country is still in its infancy, and the desulfurized gypsum produced by flue gas desulfurization has not been fully utilized due to various reasons such as technology, economy and the wide distribution of natural gypsum in my country.

Method used

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  • Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The process steps are as follows:

[0022] (1) Mixing

[0023] Mix desulfurized gypsum with water at a solid-to-liquid ratio of 1:5, and use inhibitor nitric acid to control the pH to 2;

[0024] (2) high temperature crystallization

[0025] The prepared desulfurized gypsum suspension was kept at a temperature of 110°C, a pressure of 0.2 MPa and a stirring speed of 40 rpm, kept for 40 min, vacuum filtered, and washed with water;

[0026] (3) dry

[0027] The washed calcium sulfate whiskers were kept at a temperature of 80° C. for 30 minutes to obtain calcium sulfate whiskers.

[0028] (4) Modification

[0029] The calcium sulfate whiskers are surface-modified and dispersed with stearic acid, and the amount of the modifier is 0.5% of the quality of the calcium sulfate whiskers to finally obtain calcium sulfate whiskers. After modification, the calcium sulfate whiskers can be mixed with Resin, rubber, plastic and other organic polymer compounds have good descriptive ...

Embodiment 2

[0032] The process steps are as follows:

[0033] (1) Mixing

[0034] Mix desulfurized gypsum with water at a solid-to-liquid ratio of 1:8, and use inhibitor magnesium chloride to control the pH to 3;

[0035] (2) high temperature crystallization

[0036] The prepared desulfurized gypsum suspension was kept at a temperature of 130°C, a pressure of 0.4 MPa, and a stirring speed of 130 revolutions / min, kept for 90 minutes, vacuum filtered, and washed with water;

[0037] (3) dry

[0038] The washed calcium sulfate whiskers were kept at a temperature of 120° C. for 80 minutes to obtain calcium sulfate whiskers.

[0039] (4) Modification

[0040] The calcium sulfate whiskers are surface-modified and dispersed with titanate, and the amount of the modifier is 0.9% of the mass of the calcium sulfate whiskers. Finally, calcium sulfate whiskers are obtained. After modification, the calcium sulfate whiskers can be compared with Resin, rubber, plastic and other organic polymer compo...

Embodiment 3

[0043] The process steps are as follows:

[0044] (1) Mixing

[0045] Mix desulfurized gypsum with water at a solid-to-liquid ratio of 1:11, and use inhibitor hydrochloric acid to control the pH to 4;

[0046] (2) high temperature crystallization

[0047] The prepared desulfurized gypsum suspension was kept at a temperature of 160 ° C, a pressure of 0.7 MPa and a stirring speed of 220 rpm, kept for 140 min, centrifuged, and washed with water;

[0048] (3) dry

[0049] The washed calcium sulfate whiskers were kept at a temperature of 150° C. for 130 minutes to obtain calcium sulfate whiskers.

[0050] (4) Modification

[0051] The calcium sulfate whiskers are surface-modified and dispersed with polyvinyl alcohol, and the amount of modifying agent is 1.3% of the quality of the calcium sulfate whiskers to finally obtain calcium sulfate whiskers. After modification, the calcium sulfate whiskers can be compared with Resin, rubber, plastic and other organic polymer compounds ha...

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Abstract

The invention discloses a method for using flue gas desulfurization gypsum to prepare calcium sulfate whisker, comprising process steps of size mixing, high-temperature crystallization, drying and coating, etc. The method utilizes the flue gas desulfurization gypsum as the raw material, which has low production cost, short technological process and saves natural gypsum mine and effectively relieves the environmental pollution problem of the flue gas desulfurization gypsum. The product purity can be up to more than 98 percent, which can be used as filler with medium intensity or as friction material, building material or insulating material, and the like, instead of asbestos. The product can also partly replace organic macromolecular compounds such as glass fiber, resin, rubber and plastic, and the like, and has good describability.

Description

technical field [0001] The invention relates to comprehensive utilization of industrial waste, in particular to the technical field of non-metal material processing, in particular to a method for preparing gypsum whiskers from desulfurized gypsum. technical background [0002] Desulfurization gypsum is an industrial by-product obtained by wet flue gas desulfurization with lime or limestone. It has high purity, stable composition and no radioactivity. If per ton of SO 2 Can generate 2.69 tons of gypsum CaSO 4 2H 2 O calculation, it is estimated that by 2010 the national electricity SO 2 Total emission of 20 million tons, gypsum CaSO 4 2H 2 O production will exceed 53.8 million tons. However, the research and application development of desulfurized gypsum in our country is still in its infancy, and the desulfurized gypsum produced by flue gas desulfurization has not been fully utilized due to various reasons such as technology, economy and the wide distribution of natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/00C30B29/62C30B7/10C01F11/46B01D53/50B01D53/80B01D53/96
Inventor 史培阳刘承军姜茂发
Owner NORTHEASTERN UNIV
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