Difference between silica powder and silica fume

Differences in the production process of silica fume and silica powder.

silica powder is made of natural quartz (SiO2) or fused quartz (natural quartz melted at high temperature and cooled amorphous SiO2) through crushing, ball milling (or vibration, jet milling), flotation, pickling purification, high-purity water treatment, etc. Micropowder processed by Tao process. Micro-silica fume (also called silica fume or condensed silica fume) is ferroalloy when smelting ferrosilicon and industrial silicon (silicon metal), a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, and the gas emissions Afterwards, it is rapidly oxidized with air, condensed and precipitated. It is a by-product of large-scale industrial smelting. The whole process needs to be recycled with dust removal and environmental protection equipment, because the quality is relatively light, and it needs to be encrypted with encryption equipment.

The difference in appearance between silica powder and micro silica fume

From the appearance point of view, silicon fume and silica powder are basically easy to distinguish. silica powder is pure in quality, white in color and balanced in particles. It is a non-toxic, tasteless and pollution-free inorganic non-metallic material; Or different furnace conditions, the vast majority of silica fume is gray or dark gray. During the formation process, due to the effect of surface tension in the process of phase transition, amorphous spherical particles of amorphous phase are formed, and the surface is relatively smooth, and some are agglomerates of multiple spherical particles sticking together. White silica fume is rare.

Differences in properties and uses of silica powder and silica fume

From the performance or function of silica powder and silica fume, it is divided as follows: silica powder generally has excellent temperature resistance, acid and alkali corrosion resistance, poor thermal conductivity, high insulation, low expansion, stable chemical properties, and high hardness. performance. According to its use, silica powder is divided into the following categories: ordinary silica powder, electrical grade silica powder, electronic grade silica powder, fused silica silica powder, ultrafine quartz silica powder, nano silica powder, etc.The role of silica fume is mainly used in construction materials and industrial materials such as mortar and concrete, wall decoration materials, and there are also some special uses, such as anti-caking agents in the chemical fertilizer industry.