... Metallurgy: The raw materials, additives or flux of silicon metal, silicon ferroalloy and silicon aluminium alloy,etc. Building: Concrete, glue congeal ... the filler in the sulfuric acid tower, amorphism silicon dioxide and tiny powder. Machinery: The main raw materials of foundry ... paper, abrasive paper, emery cloth etc.). Electron: Metal silicon of high strength, use the optic fibre in communication, ...