Foamed gypsum block and preparation method thereof

Abstract

The invention relates to a foamed gypsum block and a preparation method thereof. The preparation method comprises the following steps of (1) mixing mixed-phase gypsum powder with cement and an additive to prepare mixed gypsum powder; (2) mixing a surfactant and a stabilizer into a composite foaming agent; (3) uniformly stirring and mixing the mixed gypsum powder and water to prepare gypsum slurry,and adding water into the foaming agent to be stirred to form foam; (4) mixing the gypsum slurry and the foam to prepare foaming slurry; (5) pouring the foaming slurry into a building block mold, conducting initial curing on a pouring body in the mold until the compressive strength is not smaller than 2 MPa, and conducting demolding; (6) cutting the demolded casting body into the building block by using a band saw; and (7) conducting natural curing. According to the gypsum solid building block, the indexes such as the block size, strength and single block quality are basically the same as those of traditionally used aerated concrete, the gypsum solid building block can be constructed by adopting a construction method of a traditional aerated concrete building block, no special requirements for skills of workers exist, and the gypsum solid building block has a wide market prospect.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a foamed gypsum block and a preparation method thereof. Background technique [0002] Industrial by-product gypsum is an industrial by-product produced in the process of industrial production, mainly including phosphogypsum, fluorine gypsum, and desulfurization gypsum. Desulfurization gypsum is a by-product of desulfurization obtained from wet desulfurization of coal-fired boiler flue gas. At present, the annual discharge of desulfurized gypsum in my country is nearly 100 million tons. The main component of desulfurized gypsum is the same as natural gypsum, which is calcium sulfate dihydrate, with a purity of 75%-90%. Its physical and chemical properties are not significantly different from those of natural gypsum. Desulfurization Gypsum is yellow-white powder with low alkali content, the main impurities are calcium sulfite and silicon dioxide, less harmful substances,...

AI Technical Summary

Problems solved by technology

[0006] The above patent provides an aerated block with gypsum powder as the main raw material. Although the cost of raw materials is reduced to a certain extent, the curing process is carried out under vacuum conditions, requiring specific vacuum equipment, and the preparation cost is high.

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