Process for producing high-strength alpha-gypsum from chemical gypsum by adopting dry method

A chemical gypsum and gypsum technology, which is applied in the technical field of chemical gypsum dry production of high-strength alpha gypsum, can solve problems such as unstable product performance.

Inactive Publication Date: 2013-09-11
平邑开元新型建材有限公司
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Problems solved by technology

[0009] In order to reduce the water consumption and energy consumption of α gypsum production, and at the same time, the process is relatively simple, and the production investment equipment is less, the production of α gypsum by block autoclaving and steam curing is ideal. In order to make the α gypsum

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  • Process for producing high-strength alpha-gypsum from chemical gypsum by adopting dry method

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Embodiment Construction

[0019] The process for producing high-strength α-gypsum by dry method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] Specific implementation method one:

[0021] Pour 25 kg of chemical gypsum with a purity greater than 93.5% and a particle size of 100 mesh into a mixer and stir. The crystal-transforming agent sulfonate is a solution prepared by adding 1‰25g of gypsum to 2.5kg of water, and spray it on the surface of the gypsum stirred in the mixer. After mixing by the mixer for 20 minutes, take out the mixture from the mixer, pour it into the mold, place it on the platform of a 100-ton hydraulic forming press, turn on the hydraulic forming press, and align it at a speed of 1 mm / second. Pressurize, when the gypsum mixture is constantly under pressure, the water is squeezed out, the mixture is sheared and squeezed until the pressure is stable at 26MPa, and after holding the pressure for 5 minutes, release the p...

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Abstract

The invention provides a process for producing high-strength alpha-gypsum from chemical gypsum by adopting a dry method. The process comprises the following specific steps of: placing a chemical gypsum as a raw material in a mixing machine, and spraying a mixed aqueous solution of a crystal modifier of sulfonate and maleic anhydride on the surface of the chemical gypsum raw material while mixing and stirring; uniformly mixing the mixed aqueous solution with gypsum during the stirring of the mixing machine; filling the uniformly-mixed gypsum material in a die; pressing the gypsum material on a pressure forming machine, and then steam-curing the gypsum material in a steam-curing kettle; drying the steam-cured gypsum block via a forced-air drying furnace, and then crushing; and grading to obtain the qualified alpha-gypsum product. The process for producing the alpha-gypsum product is low in water consumption and energy consumption in a production process, simple, few in production investment equipment, stable in the performance of producing the alpha-gypsum product, and low in cost.

Description

technical field [0001] The invention relates to a production technology and production process for producing high-strength α-gypsum by chemical gypsum dry method. Background technique [0002] Natural or industrial gypsum, in the presence of a crystal modifier, undergoes crystal changes under a certain pressure and temperature, and dehydrates to produce α-hemihydrate gypsum containing 1 / 2 crystal water molecules. [0003] Chemical gypsum or industrial gypsum, the main component is CaSO 4 It is a by-product or waste slag of chemical enterprises. It was piled up in special waste yards by enterprises before, and now it is gradually being used to produce industrial α-gypsum and β-gypsum after chemical treatment. [0004] There are two kinds of domestic α-gypsum high-strength gypsum powder production processes, one is block autoclaving and steam curing, and the other is liquid phase production. [0005] Mass autoclaving is to send the crystal conversion agent solution with...

Claims

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Application Information

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IPC IPC(8): C04B11/02
Inventor 李玉山董秀芹刘月强
Owner 平邑开元新型建材有限公司
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