A kind of high strength modified fluorine gypsum

Abstract

The invention discloses high-strength modified fluorgypsum which comprises the following raw materials in parts by weight: 100 parts of fluorgypsum, 2-8 parts of calcium hydroxide, 3-7 parts of bauxite, 0.8-2.0 parts of sulphate aluminum cement, 1.2-2.5 parts of high-calcium coal ash, 1.2-3.8 parts of slag, 3.5-5.6 parts of redispersible emulsion powder, 2-6 parts of organosilicon waterproofing agent, 4-10 parts of modified straw fibers and 1-2 parts of silane coupling agent. The high-strength modified fluorgypsum is prepared by the following steps: adding alkylphenol polyoxyethylene ether into water, adding sodium dialkyl benzene sulfonate and N-octyl triethoxy silane after heating and stirring at preserved temperature, adding pentaerythritol after raising the temperature and stirring, and after stirring, cooling to obtain the organosilicon waterproofing agent; and adding wheat straw fibers into water, then adding a sodium hydroxide solution, and after raising the temperature, stirring and preserving heat, cooling and filtering, and drying after washing filter residues by water to obtain the modified straw fibers. The high-strength modified fluorgypsum disclosed by the invention has excellent breaking strength and compressive strength, and meanwhile, the water resistance is further improved.

Description

technical field [0001] The invention relates to the technical field of fluorogypsum, in particular to a high-strength modified fluorogypsum. Background technique [0002] Fluorogypsum is the main by-product in the production process of hydrofluoric acid and sodium fluoroaluminate. Its main component is calcium sulfate, and it contains some calcium fluoride and other fluorides, and sometimes contains a large amount of H 2 SO 4 . On the one hand, the discharged fluorine gypsum is acidic, and the untreated fluorine gypsum cannot be disposed of directly, and it is difficult to be used; Small, poor waterproof performance, these defects greatly limit its application. At present, researchers at home and abroad have done a lot of work in improving the performance of fluorine gypsum, and proposed various modification measures, such as mechanical vibration, compaction molding, mixing water reducing agents, etc., so that the anhydrous gypsum can be converted into dihydrate plaster....

AI Technical Summary

Problems solved by technology

However, the research on modified fluorogypsum is still not systematic. The modified fluorogypsum used in engineering or home decoration does not affect the inherent properties of fluorogypsum, but its mechanical strength is not good enough to meet the requirements of modern society.