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

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...

AI Technical Summary

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 produced by block autoclave The performance of gypsum products is stable, which solves the problem of unstable product performance in the production of α gypsum by autoclaving and curing in blocks. The present invention proposes a method and process for producing α gypsum by chemical gypsum dry method

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