Fluogypsum has potential hydration activity

Fluogypsum is an industrial by-product produced in the production of hydrogen fluoride using fluorite and sulfuric acid. Its main phase composition is similar to that of natural anhydrite, and it has potential hydration activity. In the absence of any treatment, fluogypsum hydration process is slow, the strength can not be effectively played, for a long time as a solid waste has been piled up in large quantities. With the vigorous development of the fluorine chemical industry, in 2009, the national production of fluorine gypsum reached more than 6 million tons, but the comprehensive utilization rate of fluorine gypsum was less than 20%. A large number of fluorine gypsum piles not only occupy a large amount of land, increasing the burden of discharge enterprises, but also the residual acid in the waste slag will penetrate into the surface rivers and groundwater under the wash of rain, seriously endangering the surrounding environment and threatening human health Kang. Therefore, it is urgent to study the modification of fluoropgypsum, stimulate the hydration activity of fluoropgypsum, exert the strength of fluoropgypsum, and utilize the fluoropgypsum resources more effectively and reasonably. Self leveling material is 20th century Developed in the 1970s, the inorganic cementing material or organic material as the base material, adding an appropriate amount of water reducing agent, water retaining agent, binder, fine aggregate and other admixture mixed evenly into the building ground leveling material, with large mobility, high stability, fast construction, smooth leveling layer and thin thickness and other advantages, is a large parking lot, workshops, supermarkets, shopping malls and other ground leveling project The selected ideal material has been widely used in building ground construction and has broad market prospects. According to the different matrix materials, self-leveling materials are divided into inorganic self-leveling materials and organic self-leveling materials, among which inorganic self-leveling materials include gypsum based self-leveling materials and cement based self-leveling materials. Cement-based self-leveling materials have been widely studied and applied because of their high strength and excellent wear resistance.