... investment casting. 1.The Quartz sand`s main component is quartz.2.the density is 2 ... , such as: beer bottles, glass, vacuum flask and decorations, can be made of optical glass, glassware ... industry can be used for smelting additives, flux and various silicon alloy. 6. Refractories industry can ... for high-temperature kiln brick, common brick, and refractory materials. 7. Cement industry cement ingredients ...