Preparation method of composite gypsum cementing material

Abstract

The invention discloses a preparation method of a composite gypsum cementing material. The composite gypsum cementing material is obtained by adding little alkali metal salt to a salic raw material, carrying out low temperature calcination to obtain a silicon-rich material, then proportionally adding calcium alkali raw materials and gypsum to the silicon-rich material and carrying out grinding. All kinds of industrial gypsum used in the preparation method can be used as the raw material of the material, without calcination. The best cost performance can be achieved by adjusting the formula according to specific application needs. Compared with traditional materials of the same kind, the composite gypsum cementing material is lower in cost, can be applied to the regions where Portland cement is not easy to obtain and can conduce to promoting treatment and extensive utilization of the industrial gypsum.

Description

technical field [0001] The invention belongs to the fields of solid waste treatment, ecological gelling materials and applications thereof, and in particular relates to a preparation method of gypsum composite gelling materials. Background technique [0002] Industrial gypsum, also called chemical gypsum, refers to by-products or waste residues produced by chemical reactions in industrial production with calcium sulfate as the main component, mainly including phosphogypsum, desulfurization gypsum, fluorine gypsum, citrate gypsum, titanium gypsum and salt gypsum. Due to environmental protection, the research on the treatment and utilization of industrial gypsum has been continuously strengthened in recent years, among which the treatment and utilization of desulfurized gypsum has made great progress, and the production lines for preparing gypsum board, construction gypsum and cement retarder using it as raw materials have been put into operation one after another. The utiliza...

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Problems solved by technology

Not only that, the content of admixtures other than gypsum in this type of gypsum composite cementitious material is relatively high, resulting in a significantly higher density of the product than building gypsum and a decrease in the moisture-regulating and air-permeable functions of gypsum, and the proportion of admixtures is difficult to grasp, and it is easy to crack

Phosphogypsum and other by-product gypsum containing more impurities have poor gel strength and are difficult to apply, resulting in a low utilization rate of the largest by-product gypsum. However, due to the limitation of the gelation mechanism of the existing composite cementitious materials, these Difficult to solve the problem effectively

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