Specification and function of microsilicon powder
Different from the domestic top H series silicon powder: in terms of indicators, there are many similarities and differences between the two. Specifically, the chemical composition of H series silicon powder and silicon powder is basically the same, the main component is silicon dioxide, and impurities contain sodium oxide, calcium oxide, magnesium oxide, iron oxide, alumina and so on. But the silicon content of H series silicon powder is relatively high, basically more than 99%, and the silicon content of silicon powder is generally 80-92%, and more than 94% is very uncommon.
Microsilica powder, also known as silica fume or condensed silica fume, is a large number of highly volatile SiO2 and Si gases produced in the mineral thermal electric furnace when the ferroalloy is smelting ferrosilicon and industrial silicon (silicon metal). After the gas is discharged, it is rapidly oxidized, condensed and precipitated with the air. It is a by-product in large industrial smelting, the whole process needs to be recycled with dust protection equipment, because the density is small, but also need to use encryption equipment to encrypt.
Silica fume powder and silica fume powder are interchangeable, but the performance of H series silica fume powder is more outstanding in the field of concrete and refractory materials: Silicon powder added to special refractory, forming a multilayer protective layer in oxidation, has good mechanical properties and high temperature resistance and oxidation resistance, special refractory added to the ultra fine silicon powder, its fluidity, sintering, bonding, porosity filling performance have been improved to varying degrees. The structure density and strength are improved, the wear rate of materials is reduced, and the erosion resistance is enhanced.