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硅粉是制取硅铁合金时的一种烟尘,主要成分为非晶质SiO_2(占85～98％)。其平均粒径为0.1～1.0微米,是一种十分细的固体玻璃质球形SiO_2旷物质混合材,一般比水泥或粉煤灰颗粒的平均直径小50～100倍。美困的硅粉产品每年有30万吨,目前全世界总产量约1100万吨。硅粉是一种活性混合材,若将一定量的超细硅粉末(比表面积为
Silica fume is a kind of fume when producing silicon-iron alloy, and the main component is amorphous SiO 2 (85-98%). Its average particle size is 0.1-1.0 micron, which is a very fine solid vitreous spherical SiO2 ruthenium mixed material, generally 50 to 100 times smaller than the average diameter of cement or fly ash particles. US sleepy silicon powder products have 300,000 tons per year, and the current total world production is about 11 million tons. Silica fume is an active compound if a certain amount of ultrafine silicon powder is used (specific surface area is