... ,coke and scrap iron in the furnace. The main components of the silica powder is SiO2. The color of the silica fume is ... ,The tiny silica powder as good modified material of concrete, can be used in the construction.Tiny silica powder high-strength concrete ... building ,so it has great application value to use in the construction of bridges, water conservancy, and metro,ect. 2,The silica ...