Micro-silica powder, also called silica ash or cohesive silica ash, is produced by ferroalloys in smelting ferrosilicon and industrial silicon (silicon metal), and a large amount of highly volatile SiO2 and Si gas is produced in the mineral-heated electric furnace, which is precipitated by rapid oxidation and condensation with air after the gas is discharged. It is a by-product of large industrial smelting, and the whole process needs to be recovered with dust removal and environmental protection equipment, and because of the small density, it also needs to be encrypted with encryption equipment.

In terms of particle size, silica micronized powder processed from natural quartz has a relatively large particle size of 200 mesh, 300 mesh, 400 mesh, 500 mesh, 600 mesh, 800 mesh, 1000 mesh, 1250 mesh, 3000 mesh, 5000 mesh, 10000 mesh, etc. It is a powder state. The fineness of micro-silica powder is less than 1μm accounting for more than 80%, the average particle size in 0.1-0.3μm, is a kind of gray state.