Method used for preparing light calcium silicate boards from waste silica fume

Abstract

The invention provides a method used for preparing light calcium silicate boards from waste silica fume, production cost of calcium silicate boards is reduced, and both economic benefits and social benefits are achieved. The method comprises following steps: A, silica fume collected from different ferroalloy plants is subjected to component analysis, and mixing and combination are carried out based on analysis indexes so that indexes of silica fume obtained via mixing and combination are capable of satisfying production requirements; B, full decomposition of composite fiber is realized using a pulping machine, a thickening agent is dissolved in water so as to obtain an aqueous solution, decomposed fiber and the thickening agent aqueous solution are added into pulping water, an obtained mixed material is stirred to be uniform, weighed silica fume, quartz sand, slaked lime, cement, and coal ash microsphere are added, and a slurry needed by calcium silicate board production is prepared using a mixinghollander, wherein the coal ash microsphere is obtained via pre-wetted treatment; and C, the slurry is subjected to board preparation machine moulding, pressurization, maintenance and sizing, high pressure steaming, drying, sanding, and the like so as to obtain the light calcium silicate boards.

Description

technical field [0001] The invention belongs to the technical field of production of building decoration materials, and in particular relates to the production technology of light calcium silicate boards. Background technique [0002] Micro-silica fume is a fine spherical amorphous SiO2 microbead formed during the smelting process of ferrosilicon or metal silicon, and is now widely used in construction, refractory, chemical and other fields. At present, the application standard of micro-silica fume at home and abroad is determined to be that the SiO2 content is not less than 85%, while the SiO2 content of micro-silica fume recycled by ferroalloy enterprises in Northwest my country is mostly about 75-82%, which cannot meet the use standard, causing a large number of The phenomenon that low-grade micro-silica fume cannot be processed and pollutes the environment has brought huge economic losses and environmental pressure to enterprises and the local area. [0003] Due to the l...

AI Technical Summary

Problems solved by technology

At present, the application standard of micro-silica fume at home and abroad is determined to be that the SiO2 content is not less than 85%, while the SiO2 content of micro-silica fume recycled by ferroalloy enterprises in Northwest my country is mostly about 75-82%, which cannot meet the use standard, causing a large number of Low-grade micro-silica fume cannot be processed and pollutes the environment, which brings huge economic losses and environmental pressure to enterprises and the local area