METHOD OF PRODUCING SOLUTIONS OF ALKALI METAL SILICATES AND AMMONIUM SILICATE Russian patent published in 2015 - IPC C01B33/32 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical, metallurgical, textile, paper and paint industry. First, quartz which is ground to grain size smaller than 50 mcm is mixed with insoluble quartz sand with grain size of -0.15+0.05 mm in amount of 5-20% of the weight of quartz and dissolved in alkali solutions at temperature of 120-170°C and pressure of up to 0.8 MPa. The obtained suspension is cooled and filtered. The alkali solutions can be prepared immediately before preparing solutions of alkali metal silicates and ammonium silicate. Amorphous silica can be added to the filtrate to increase the modulus.

EFFECT: obtaining pure solutions of alkali metal silicates and ammonium silicate, as well as mixtures thereof with modulus of 1-4,5, density of 1100-1500 kg/m³ and viscosity of 50-10000 mPa·s.

3 cl, 1 ex