Method for producing high-strength environment-friendly whitewash gypsum by using desulfurization gypsum

Abstract

The invention relates to a method for producing high-strength environment-friendly whitewash gypsum by using desulfurization gypsum. The method comprises the following steps of: firstly, frying the desulfurization gypsum into desulfurization building gypsum with Beta-type semi-hydrated gypsum as the main component, and grinding the desulfurization building gypsum till the specific surface area is 2000-2500cm / g, thus obtaining modified desulfurization building gypsum; and secondly, sequentially doping 0.5-0.6 percent of set retarder and 0.2-0.4 percent of water retention agent into the modified desulfurization building gypsum obtained in the first step according to mass percentage, mixing evenly and then packaging the mixture, thus obtaining the finished product. By grinding and modifying the fried desulfurization building gypsum, the method changes the particle grading distribution of the desulfurization building gypsum and effectively improves the physical properties such as the water retention property, the strength and the like of the whitewash gypsum; the utilization of the muscle protein type gypsum set retarder for adjusting the setting time greatly reduces the strength loss caused by the prolonging of the setting time; and the product obtained according to the method meets environmental protection requirements.

Description

technical field [0001] The invention relates to a production method of plastering gypsum, in particular to a method for producing high-strength and environment-friendly plastering plaster by using desulfurized gypsum. Background technique [0002] Desulfurization gypsum is the wet flue gas desulfurization product of large and medium-sized power plants. At present, the annual emission of desulfurization gypsum in my country has reached 10 million tons. The use of desulfurization gypsum to produce plaster plaster has rich resource advantages, and plaster plaster has low energy consumption and convenient construction. , fine plastering layer, good living comfort and fire resistance, etc., is a wall plastering material with good development prospects. [0003] Due to the fine particle size of desulfurized gypsum, 90% of it is concentrated below 70μm, and the specific surface area is usually 1400-1600cm 2 / g, with high fineness, so desulfurized gypsum can be used directly after f...

AI Technical Summary

Problems solved by technology

As a result, the strength and bonding performance of plaster plaster are low, and it is difficult to meet the technical index requirements stipulated in product standards.

Usually, the method of adding organic adhesives is used to improve the adhesive force, and organic adhesives generally contain toxic and harmful chemical components, which seriously affect the health of operators and the sanitation of the surrounding production environment.