Process for the preparation of crystalline sodium silicates

Details Process for the preparation of crystalline sodium silicates Process for the preparation of crystalline sodium silicates

1990-12-28

1993-02-02

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423332, C01B 3332

Patent

active

051836513

ABSTRACT:
To prepare crystalline sodium silicates having a layer structure and the formula Na.sub.2 Si.sub.x O.sub.2x+1, in which x is between 2 and 3, sand and soda are first fused in a molar ratio of SiO.sub.2 /Na.sub.2 O of 2 to 3.5 at temperature of 1200.degree. to 1400.degree. C. The water-glass obtained in pieces after the melt has cooled is ground to particle sizes of less than 2 mm before it is treated at temperatures of 600.degree. to 800.degree. C. for 10 to 120 minutes in an elongated reaction zone with mechanical circulation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.

REFERENCES:
patent: 1119720 (1914-12-01), Paterson
patent: 3203755 (1965-08-01), Rathmell
patent: 4585642 (1986-04-01), Rieck
Glastechnische Berichte, 37. Jahrgang, Heft 4, (1964) pp. 194-200.

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