Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. Silicon
metal and alloys are produced in electric furnaces. The raw materials are quartz,
coal, and woodchips. The smoke that results from furnace operation is collected
and sold as silica fume, rather than being landfilled. Silica fume consists
primarily of amorphous (non-crystalline) silicon dioxide (SiO
2), its
average granule diameter is 0.15 - 0.20μ, specific surface area is
15,000~20,000sqm/kg, and it has extremely strong surface active. Because of its fine
particles, large surface area, and the high SiO
2 content, silica fume
is a very reactive pozzolan when used in concrete. At the same time, silica fume
can still be used in the production of refractory and porcelain; to raise intensity
and durability. It also can improve the material overall performance as filler,
used in paint, coating, resin, rubber and other high molecular material.
Analysis result:
SiO
2: 87.02, 92.00
K
2O: 1.34, 1.15
Na
2O: 0.55, 0.48
pH value: 8.20, 7.88
Loss on Ignition at 750
oC: 1.80, 1.60
H
2O (when bagged): 0.8, 0.40
Specific surface area (B.E.T.): 18sqm/g, 19sqm/g
Bulk density (kg/cbm): 500 - 600
Packing:
Jumbo bags, 900kg/bag (derstand)
