Method for producing paper gypsum board using desulfurated gypsum and ardealite

Abstract

The invention discloses a making method of paper plaster board, which comprises the following steps: mixing the phosphogypsum and desulfuration plaster according to the weight ratio at 50-90:50-10; drying until the free water content under 5 percent; sintering the plaster at 160-220 DEG C continually to form the calcined gypsum powder with 5-9 percent crystal water; cooling in the bin; placing to obtain the architecture plaster powder; stirring the plaster powder with white corn starch latex, foaming agent, glass fiber and water evenly into material paste; compounding the roof and bottom of paper plaster board through plate-typed molder. The invention saves the natural plaster resource and cost, which improves the product property.

Description

technical field [0001] The invention belongs to building decoration materials, in particular to a plasterboard with paper surface. Background technique [0002] In the production of agricultural phosphate fertilizer, my country discharges 30 million tons of phosphogypsum every year, which occupies a large amount of land for storage and causes secondary pollution to the environment. In the flue gas desulfurization process of coal-fired thermal power plants, the desulfurization device produces a large amount of desulfurization gypsum. The annual discharge of wet desulfurization gypsum in power plants is about 4 million tons, and it is expected to reach more than 10 million tons in 2006. Phosphogypsum and desulfurization gypsum are collectively referred to as industrial by-product gypsum, and its chemical composition is CaSO 4 2H 2 O, the content is as high as 90%. These industrial gypsums are currently mainly used as cement admixtures, building hollow blocks, plastering gy...

AI Technical Summary

Problems solved by technology

This is because phosphogypsum has high impurity content, many types, acidity, and unstable performance. If phosphogypsum is used alone instead of natural gypsum, the bonding performance between the gypsum board surface and the core will be weak, the water demand will be unstable, and the setting time will be unstable. Longer adverse phenomenon; while desulfurization gypsum is relatively low in impurity content, less in variety, neutral and alkaline, and relatively stable in performance

Desulfurization gypsum is used alone instead of natural gypsum. Due to its poor particle gradation and narrow particle distribution band, the gradation is far worse than that of natural gypsum ground gypsum powder. The performance is not good. If it is used to produce paper-faced gypsum boards, it is difficult to control the conveying, metering, and feeding performance of its dry powder on the one hand. Problems such as poor adhesion

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