Process for the preparation of crystalline sodium silicates havi

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

1991-04-26

1993-05-18

Breneman, R. Bruce

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

423326, 423332, 423334, C01B 3332

Patent

active

052119300

ABSTRACT:
For the preparation of crystalline sodium silicates having a sheet structure and an SiO.sub.2 /Na.sub.2 O molar ratio of 1.9:1 to 3.5:1 from waterglass solutions having a solids content of 20 to 65% by weight, the waterglass solutions are first treated in a spray-drying zone. This gives a pulverulent amorphous sodium silicate having a maximum ignition loss of 20% by weight, while the waste gas leaving the spray-drying zone is at a temperature of at least 140.degree. C. Thereafter, the spray-dried sodium silicate is heated in an ignition zone containing an agitated solid bed at temperatures of 500.degree. to 800.degree. C. for 1 to 60 minutes in the presence of at least 10% by weight of recycled material. This recycled material was obtained by mechanical comminution of crystalline sodium silicate discharged from the ignition zone.

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