Restored under the laboratory available magnesium powder in the hot powdered silica, with dilute acid to produce magnesium oxide and magnesium powder, with hydrofluoric acid wash did not effect of silica, Silicon. Of this approach is not pure amorphous silicon, is brownish black powder. Industrial production of Silicon in electric arc furnace in the reduction of silica (SiO2 content is more than 99%). Using reducing agents such as petroleum coke and charcoal. When you use DC electric arc furnace can all use petroleum coke instead of charcoal. Low ash content of petroleum coke (0.3%~0.8%), using high quality silica (SiO2 is greater than 99%), high quality silicon for the manufacture of silicon steel sheet can be directly. 1,200 ℃ high purity semiconductor Silicon thermal Silicon rods using hydrogen reduction of high-purity silicon trichlorosilane SiHCl3 or SiCl4. Ultra pure silicon by Czochralski or zone melting process preparation.