Composite crystal modifier for preparing alpha-type high-strength gypsum

A technology of high-strength gypsum and crystallizer, applied in the fields of calcium/strontium/barium compounds, inorganic chemistry, calcium/strontium/barium sulfate, etc. The effect of high product strength and strong applicability

Active Publication Date: 2019-01-18
东磐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above crystal modifiers have played a certain role in the regulation of the crystal form of α-type hemihydrate gypsum in terms of different raw material properties, preparation processes, types and dosages of crystal modifiers, and the effect of crystal modifiers is generally affected by the proper

Method used

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  • Composite crystal modifier for preparing alpha-type high-strength gypsum
  • Composite crystal modifier for preparing alpha-type high-strength gypsum
  • Composite crystal modifier for preparing alpha-type high-strength gypsum

Examples

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Embodiment 1

[0032] In this example, α-type high-strength gypsum is prepared by using the high-pressure hydrothermal method combined with the crystal transformation agent described in the present invention. The main process steps are as follows:

[0033] 1) Preparation of slurry: stirring and mixing natural gypsum or industrial by-product gypsum whose main component is dihydrate gypsum with the crystal modifier of the present invention and a certain amount of water to form a gypsum suspension with a solid content of 10% to 50%;

[0034] 2) Crystallization of α-type hemihydrate gypsum: Add the above-mentioned gypsum suspension into the autoclave, heat and stir the gypsum suspension in the autoclave, and keep it warm at 110-140°C for 3h to 7h, after the crystallization is completed The slurry is kept warm and released for solid-liquid separation;

[0035] 3) Drying and grinding: After drying the separated solid at 100°C, it is modified by grinding (grinding into fine powder) to obtain α-type...

Embodiment 2

[0042] In this embodiment, the α-type high-strength gypsum is prepared by the normal pressure hydrothermal method combined with the crystal transformation agent described in the present invention, and the main process steps are as follows:

[0043] 1) Preparation of slurry: Stir and mix natural gypsum or industrial by-product gypsum whose main component is dihydrate gypsum, crystal modifier of the present invention, inorganic salt solution and a certain amount of water to form gypsum with a solid content of 10% to 50%. suspension;

[0044] 2) Crystallization of α-type hemihydrate gypsum: Add the above-mentioned gypsum suspension into an atmospheric pressure hydrothermal reaction kettle, heat and stir the gypsum suspension in the reaction kettle, and conduct a dynamic hydrothermal reaction at 85-100°C for 3-7 hours After the crystal transformation is completed, the slurry is kept warm and released, washed with boiling water and separated into solid and liquid;

[0045] 3) Dryi...

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Abstract

The invention relates to a composite crystal modifier for preparing alpha-type high-strength gypsum, which belongs to the technical field of gypsum additives and gypsum deep processing. The crystal modifier is formed by compounding inorganic fluoride salt accounting for 0.02 to 6 percent of the mass of a dihydrate gypsum dry base, and multi-element organic acid or organic acid salt accounting for0.02 to 1 percent of the mass of the dihydrate gypsum dry base. By utilizing the composite crystal modifier disclosed by the invention, when the alpha-type high-strength gypsum is prepared from dihydrate gypsum under a hydrothermal condition, a crystal habit of the alpha-type semi-hydrate gypsum can be effectively regulated and controlled, the alpha-type semi-hydrate gypsum can form short cylindrical alpha-type semi-hydrate gypsum crystals, so that the high-strength gypsum with the pressure resisting strength greater than 25MPa and a product thereof can be prepared. The composite crystal modifier is particularly suitable for preparing the alpha-type high-strength gypsum by adopting phosphorus gypsum with high fluorine impurity content as a raw material.

Description

technical field [0001] The invention belongs to the technical field of high-strength gypsum admixture and gypsum deep processing, and in particular relates to a composite crystal-transforming agent for α-type high-strength gypsum. Background technique [0002] α-type high-strength gypsum has a wide range of applications in high-end decoration materials, self-leveling gypsum, 3D printing materials, arts and crafts, ceramic casting molds, etc. . At present, the manufacturing methods of α-hemihydrate gypsum in my country can be mainly divided into autoclave method and hydrothermal method. Autoclave method is the product of dihydrate gypsum removing 1.5 crystal water in saturated steam medium, which is suitable for block or granular raw materials; hydrothermal method is the product of dihydrate gypsum slurry removing 1.5 crystal water under hydrothermal conditions Products, hydrothermal method can be divided into normal pressure method (prepared in acid or salt aqueous solutio...

Claims

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Application Information

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IPC IPC(8): C04B11/032C04B11/024C01F11/46
CPCC01F11/466C01P2004/03C04B11/024C04B11/032
Inventor 茹晓红张新爱林海燕王玉江郅真真钟旭航
Owner 东磐科技有限公司
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