What kind of raw material of glass?
The composition of ordinary (sodium) glass is a mixture of sodium silicate and calcium silicate, mixed with a small amount of silica and alumina. Usually made by eutectic of sand, sodium carbonate and calcium carbonate; sodium sulfate and carbon can also be used. The mixture is melted instead of sodium carbonate.
Other glasses, such as potassium glass, are a kind of glass that is more resistant to high temperature, harder and more chemically resistant. It can be made by partially replacing sodium salt with potassium carbonate or potassium sulfate when melting glass. It is mainly used in manufacturing experiments. Commonly used chemical containers. Vermiculite glass is a high-density and high-refractive-index glass that can be made by replacing lead with sodium in soda glass when melting glass. It is suitable for the manufacture of optical glass and engraved glass products. Low thermal expansion coefficient, resistance to quenching and rapid heat, high temperature resistance and chemical corrosion resistance, can reduce the sodium content when melting glass, maintain the high content of silica, and add 12% to 15% of boron trioxide. Made, mainly used to manufacture higher-grade chemical reaction vessels.
small amount of glass colorant is added to the glass to obtain various colored glass. Copper (II) oxide or chromium (III) oxide produces green color; cobalt (II) oxide produces blue color; manganese dioxide produces purple color; tin dioxide Or calcium fluoride produces milky white; uranium compounds produce yellow-green fluorescence; colloidal selenium produces red jade; colloidal gold produces red, reddish purple or blue; cuprous oxide produces red, green or blue; ferrous compounds produce green When the amount is large, it is black; the iron (III) compound produces yellow. When making glass, the glass is greenish due to the impurities containing ferrous iron in the raw material, and a small amount of manganese dioxide or selenium may be added to make it into colorless glass.