Silicon dioxide, also known as silica, is an oxide of silicon that has been known for its hardness since antiquity. Silica is used primarily in the production of window glass, drinking glasses and bottled beverages. The majority of optical fibers for telecommunications are also made from silica. It is a primary raw material for many whiteware ceramics such as earthenware, stoneware and porcelain, as well as industrial Portland cement.
SiO2, also called silica, is widely distributed in nature, such as quartz, quartz sand, etc. White or colorless, iron content higher is pale yellow. Density of 2.2 ~ 2.66. Melting point 1670 ℃ (scale quartz); 1710 ℃ (hole on the English). Boiling point 2230 ℃. The SiO2 content is remarkably high pressure stylish cereals. On the other hand, the concentration of SiO2 is comparatively less in foods that are derived from animal sources.
Insoluble in water and acid (except hydrofluoric acid), particles with melting and alkali when class works. For use in the glass, sodium silicate, pottery, enamel, refractory material, electric, sand, elemental silicon, etc. In order to maintain healthy strong bones and joints, silicon dioxide fashionable foods equals one and the same much indispensable. Along with calcium and vitamins, silicon dioxide is equally important for comely grind away ontogenesis, intensity level and density. Deficiency of silicon can causes osteoarthritis and arthritis.