What are the raw materials of water glass?
The water soluble alkali metal silicate glass is formed by the combination of alkali metal oxide and silica, also called paohuajian. Water glass can be divided according to the type of alkali metal sodium silicate and potassium silicate, the molecular formula of N and K2O.nSiOz. in Na2O.nSiO2 coefficient is called the modulus of water glass, molecular oxidation silicon and alkali metal oxides in water glass ratio (or molar ratio). The modulus of water glass is an important parameter of water glass, generally between 1.5-3.5. The greater the modulus of water glass, solid water glass is difficult to dissolve in water, which can dissolve in water at room temperature for n 1, n is required to increase the water solubility. N is greater than 3 to 4 above atmospheric pressure steam can be dissolved. The modulus of water glass is larger, more silicon oxide content, water glass viscosity, easy decomposition hardening, bond strength increases.
Water glass production has two kinds of dry and wet method. Dry quartzite and soda ash as raw material, grinding mix, in the furnace to the temperature of 1300-1400 DEG C melting, press type reaction of solid water glass, dissolved in water and prepared liquid water glass
The wet production of quartzite powder and caustic soda as raw materials in autoclave, 2 - 3 atmospheric pressure steam reaction, generating liquid water glass.