The nature and main use of water glass
Sodium silicate compound is an alkali metal oxide to silica in varying proportions from a water-soluble silicate, for the gray or light yellow viscous liquid. The water glass can be further divided into potassium silicate (K 2 O·nSiO 2 ) and sodium silicate (Na 2 O·nSiO 2 ). The ratio n of the silica (the molar number of SiO 2 to the alkali metal oxide (K 2 O or Na 2 O) is called the modulus of the water glass. When n≥3, it is called neutral water glass, n< At 3 o'clock, it is called alkaline water glass.
Potassium silicate is monoclinic crystal, white powder, fine granular crystal or round pellet; its melting point is 891 ° C, soluble in water, insoluble in ethanol and ether, strong in hygroscopicity, easy to agglomerate Mainly for the production of electronic tubes, television picture tubes, glass materials for computer monitors.
Sodium silicate water glass is usually a viscous, high-concentration, strongly alkaline aqueous solution, usually represented by Na 2 O·nSiO 2 ·xH 2 O. The content of sodium silicate in water glass is 35% to 50%, the viscosity is 0.25 to 0.5 Pa·s, the pH is 13 to 14, and the titration alkalinity is equivalent to 3 to 4 mol/L NaOH solution. It is mainly used as an adhesive for packaging materials, a raw material for detergents, a raw material for refractory materials and foundry industry, a raw material for manufacturing chemical products, and a quick-setting admixture for concrete. The water glass commonly used in ore dressing refers to sodium silicate water glass.
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