Micro silica fume has excellent performance, such as high activity, good flow property, water reducing and strengthening. It is very important in the construction of cement mortar and concrete industry. Therefore, it is widely used in construction, metallurgy, chemical industry, cement and other industries.
According to SiO2 content:
1, SiO2 ≥ 85%, SiO2 content is more than 88%, the main control of ignition loss (less than 6%), used for concrete and low-grade refractory.
2, SiO2 ≥ 90%, SiO2 content is about 92%, according to customer requirements, control impurities, used in concrete and general refractory.
3, SiO2 ≥ 92%, SiO2 content is about 94%, there are specific requirements, used in high-grade refractory with liquidity requirements.
4, SiO2 ≥ 97%, SiO2 content is more than 96%, there are strict requirements of impurities and pH value, but different customer focus is not the same, used in high-grade refractories.
Silica fume is divided according to the particle size or the specific surface area:
1, the median size is about 0.3um, the specific surface area is 15-25 m2/g, almost all of the particle size are less than 1um, the vast majority of the world belong to this type.
2, silica fume median size is about 0.1um or less, the specific surface area is ≥ 30m2/g, generally appear in high purity silica fume, relatively rare.
3. The median diameter is 0.5-2.0um, and the specific surface area is 5-15 m2/g, which is rare.
4, the median diameter is more than 2.0um, is extremely rare, with poor performance.
The silica fume is divided according to the bulk density:
1, original shape, 100-170kg/m3, easy to bond, poor transportation.
2, mild densified, 250-400kg/m3, basically no particles, transport obviously improved. But the temperature is unstable.
3, semi-densified, 400-500kg/m3, began to appear a large number of loose particles, not easy to bond, good transportation.
4, high density 500-700kg/m3, basically have hard particles (different products size and tightness of different products), excellent transport.
FLOW DETECTION OF DENSIFIED MICRO SILICA FUME AND UNDENSIFIED MICROSILICA: http://microsilica-fume.com/flow-densified-undensified-microsilica.html