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Alpha-type high-strength gypsum

A high-strength, gypsum technology, applied in the field of gypsum, can solve the problems of large difference in product quality, complex post-processing process, and high impurity content, and achieve the effects of high grade, strong mechanical strength, and simple post-processing process.

Inactive Publication Date: 2021-06-01
JIANGXI JINGHAO SALINIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the research focuses on how to deal with boiler desulfurization gypsum, phosphogypsum and other fields. However, industrial by-products such as desulfurization gypsum, phosphogypsum, and pottery mold gypsum have a lot of impurities, and the post-treatment process is complicated and costly. The quality of α-gypsum whiskers is quite different from that obtained from natural gypsum resources

Method used

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  • Alpha-type high-strength gypsum
  • Alpha-type high-strength gypsum
  • Alpha-type high-strength gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation method of α-type high-strength gypsum comprises the following steps:

[0049] Preparation of Salt Gypsum:

[0050] (1) Soda ash light calcium liquid is injected into Glauber's salt type brine wells to extract brine to obtain nitric brine, low nitric brine, and calcium brine respectively; condensed water and salt-making exhausted water are injected into brine wells to obtain nitric brine;

[0051] (2) Nitrate and calcium brine are reacted at a volume ratio of 1:0.2-1:0.6 to obtain low-nitrate brine, and the precipitate in the reaction is collected to obtain the salt-containing (NaCl) gypsum.

[0052] Preparation of α-type high-strength gypsum:

[0053] 1) Condensed water washes and desalts the salt-containing (NaCl) gypsum, and then filters to obtain calcium sulfate dihydrate;

[0054] 2) adding the calcium sulfate dihydrate obtained in step 1) into an aqueous solution of a crystal-transforming agent, stirring to make the aqueous solution of the crystal...

Embodiment 2

[0061] The preparation method of α-type high-strength gypsum comprises the following steps:

[0062] Preparation of Salt Gypsum:

[0063] (1) Soda ash light calcium liquid is injected into Glauber's salt type brine wells to extract brine to obtain nitric brine, low nitric brine, and calcium brine respectively; condensed water and salt-making exhausted water are injected into brine wells to obtain nitric brine;

[0064] (2) Nitrate and calcium brine are reacted at a volume ratio of 1:0.2-1:0.6 to obtain low-nitrate brine, and the precipitate in the reaction is collected to obtain the salt-containing (NaCl) gypsum.

[0065] Preparation of α-type high-strength gypsum:

[0066] 1) Condensed water washes and desalts the salt-containing (NaCl) gypsum, and then filters to obtain calcium sulfate dihydrate;

[0067] 2) adding the calcium sulfate dihydrate obtained in step 1) into an aqueous solution of a crystal-transforming agent, and stirring to make the aqueous solution of the cry...

Embodiment 3

[0074] The preparation method of α-type high-strength gypsum comprises the following steps:

[0075] Preparation of Salt Gypsum:

[0076] (1) Soda ash light calcium liquid is injected into Glauber's salt type brine wells to extract brine to obtain nitric acid water, low-nitrate brine, and calcium brine respectively; condensed water and salt-making exhausted water are injected into brine wells to obtain nitric brine;

[0077] (2) Nitrate and calcium brine are reacted at a volume ratio of 1:0.2-1:0.6 to obtain low-nitrate brine, and the precipitate in the reaction is collected to obtain the salt-containing (NaCl) gypsum.

[0078] Preparation of α-type high-strength gypsum:

[0079] 1) Condensed water washes and desalts the salt-containing (NaCl) gypsum, and then filters to obtain calcium sulfate dihydrate;

[0080] 2) adding the calcium sulfate dihydrate obtained in step 1) into an aqueous solution of a crystal-transforming agent, stirring to make the aqueous solution of the c...

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Abstract

The invention discloses a preparation method of alpha-type high-strength gypsum, and the method comprises the following steps of: 1) washing and desalting gypsum containing salt (NaCl) by using condensed water, and then performing filtering to obtain calcium sulfate dihydrate; 2) adding the calcium sulfate dihydrate obtained in the step 1) into a crystal modifier aqueous solution, and performing stirring to enable the crystal modifier aqueous solution to fully wet the calcium sulfate dihydrate for crystal transformation; 3) transferring the calcium sulfate dihydrate after crystal transformation in the step 2) into a buffer kettle for buffering; and 4) carrying out solid-liquid separation on the buffered sodium sulfate dihydrate obtained in the step 3); the salt-containing gypsum is obtained by preparing low-nitrate halogen, and the product obtained by the method is pure, high in grade and few in impurities, and the post-treatment process is simple.

Description

technical field [0001] The invention relates to the field of gypsum, in particular to a method for preparing high-strength gypsum. Background technique [0002] α-type high-strength gypsum is a kind of high-strength gypsum. Generally, its strength is very high, which is more than 3 times that of ordinary gypsum powder. It has good mechanical properties, work performance, environmental protection performance and biological properties. α-type high-strength gypsum Not only can it replace traditional building gypsum to enhance product quality, but it can also be used in a wider range, such as precision casting, high-end building materials, arts and crafts, medical treatment, aviation, ships and other fields. With the development of the economy, the demand for α-type high-strength gypsum continues to increase, and its performance requirements are also getting higher and higher. At present, α-type high-strength gypsum is widely used in some building materials in my country, inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/032C04B11/024
CPCC04B11/262C04B11/032C04B11/024
Inventor 林应南邓强李春林孙七林陈国华宋信信
Owner JIANGXI JINGHAO SALINIZATION
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