Process for producing thistle board by using desulphurization gypsum and natural gypsum

Abstract

The invention discloses a process for producing a thistle board by using desulphurization gypsum and natural gypsum, which comprises three process steps of milling, pulping and board making. The method uses the desulphurization gypsum and the natural gypsum according to certain proportion, reduces energy consumption of a manufacturing technique of the natural gypsum, effectively adjusts the grain composition of building gypsum powder, reduces the resource consumption while ensuring the normal production and the product quality of the thistle board, protects natural minerals and the environment, and achieves better effect of comprehensive utilization of resources.

Description

technical field [0001] The invention relates to a process for producing paper-faced gypsum boards by using desulfurized gypsum and natural gypsum, and belongs to the field of building decoration materials. Background technique [0002] At present, most domestic gypsum building material enterprises use natural gypsum as the main raw material for production. Gypsum ore can be prepared in any particle size distribution according to needs during production. The production process of natural gypsum consumes a lot of energy, and it needs mineral processing, crushing, fine grinding, and calcination to obtain it. It is used as construction gypsum powder for plasterboard, and natural gypsum is a non-renewable mineral resource, and mining will inevitably cause environmental impact. [0003] Extensive use of gypsum ore has resulted in over-exploitation of mineral resources and damage to the natural environment. Coupled with the limited nature of natural gypsum resources, its price has ...

AI Technical Summary

Problems solved by technology

[0005] Compared with natural gypsum, desulfurized gypsum has less impurity content, smaller particle size, and stable composition. Because the free water content of its raw materials is between 10-15%, and its viscosity is strong, it will cause blockage during loading, lifting, and transportation. , not conducive to automated production

In addition, due to poor gradation, the particle distribution zone is far narrower than that of natural gypsum ground gypsum powder. After making building gypsum powder, the strength is low, because it is hard and brittle, and its fluidity is not good. If it is used to produce paper surface Gypsum board, on the one hand, it is difficult to control the conveying, metering, and feeding performance of its dry powder; on the other hand, after adding water and stirring, it is easy to cause problems such as uneven foaming in the board, poor bonding of the board core and the protective paper, etc.