Building gypsum based on industrial solid waste desulfurized gypsum as raw material and preparation method thereof

Abstract

The invention discloses building gypsum based on industrial solid waste desulfurized gypsum as a raw material and a preparation method thereof. The building gypsum based on industrial solid waste desulfurized gypsum as a raw material comprises the following raw materials in parts by weight: 120-160 parts of desulfurized gypsum, 30-45 parts of microporous ceramic, 40-60 parts of vitrified micro bubbles, 20-35 parts of expanded perlite, 5-8 parts of coconut shell powder, 3-8 parts of cement, 1-3 parts of sodium carboxymethyl cellulose, 0.3-0.35 parts of a retarder, 0.2-0.4 parts of hydroxymethylcellulose, 0.2-0.4 parts of polypropylene fiber and 0.2-0.5 parts of a composite early strength agent. The raw materials are environment-friendly material, desulfurized lime, microporous ceramic, sodium carboxymethyl cellulose, coconut shell powder and the like are compounded for use, the obtained building gypsum is proper in viscosity, high in grain size gradation and good in water-retaining property and has an energy storage function, the problem that an obtained building gypsum product is easy to fall off after use due to high content of water in desulfurized gypsum in subsequent utilization and treatment is solved, and the building gypsum has a wide market prospect.

Description

technical field [0001] The invention relates to the technical field of building materials. More specifically, the present invention relates to a construction gypsum based on industrial solid waste desulfurized gypsum as a raw material and a preparation method thereof. Background technique [0002] Desulfurization gypsum is based on the industrial solid waste produced after desulfurization in power plants. Although its chemical composition is similar to natural gypsum, the desulfurization gypsum obtained from power plants differs according to the production process. The crystallization size and particle distribution of desulfurization gypsum are uniform. Different, the crystallized particles of desulfurized gypsum obtained from the power plant are relatively small, which belongs to the registered one with poor gradation, and the desulfurized gypsum produced by the power plant has a high water content, generally above 10%, and it is easy to form loose clusters when pressure is...

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Problems solved by technology

[0002] Desulfurization gypsum is based on the industrial solid waste generated after desulfurization in power plants. Although its chemical composition is similar to natural gypsum, the desulfurization gypsum obtained from power plants is different according to the production process. The crystallization size and particle distribution of desulfurization gypsum are uniform. Different, the crystallized particles of desulfurized gypsum obtained from the power plant are relatively small, which belongs to the registered one with poor gradation, and the desulfurized gypsum produced by the power plant has a high water content, generally above 10%, and it is easy to form loose clusters when pressure is applied. shape, with a certain degree of adhesiveness, it is easy to cause sticking and clogging of the processing device;

[0003] The existing treatment method is to calcinate the desulfurized gypsum. Although the moisture content of the calcined gypsum is reduced, its surface area and particle distribution are still large, the obtained gypsum has poor water saturation, and the produced gypsum products have large volumetric weight and low strength. uniform

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