silica fume【价格 厂家 供应】-pg电玩城

chemical properties of silica fume

1, silica fume, appearance is gray or gray powder, refractoriness > 1600 ℃. bulk density: 1600~1700 kg/m3.

2. fineness of silica fume: in the silica fume, the fineness less than 1 is more than 80%, the average particle size is 0.1-0.3 wives, and the specific surface area is 20 ~ 28m2/g. its fineness and specific surface area are about 80 ~ 100 times of cement and 50 ~ 70 times of fly ash.

3. particle morphology and mineral phase structure: during the formation process of silica fume, the amorphous spherical particles of the amorphous phase are formed due to the effect of surface tension during the phase transformation process, and the surface is relatively smooth. some of them are agglomerates where multiple spherical particles stick together. it is a very large specific surface area, highly active volcanic material. the tiny ball can lubricate the materials with silica fume.

basic properties of silica fume

color - the color of silica grey is between light grey and dark grey.

compared with cement (3.1g/cm3), the proportion of silicon ash is about 2.2g/cm3, similar to that of fly ash.

loose bulk density - loose bulk density of raw silica ash obtained by direct dust collection is generally between 150 ~ 250kg/m3. loose bulk density of silica fume can be increased to 500 ~ 700kg/m3 by means of densification process.

grain shape - very small, smooth, glassy spherical particles.

backgrain size - most of the particles are less than 1 micron in size, with an average particle size of about 0.15 micron, which is only 1/100 of the diameter of cement particles.

specific surface area -- between 15,000 and 25,000m2/kg (measured by nitrogen adsorption).