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...

C - Chemistry, Metallurgy

01

B

23/189

C01B 33/32 (2006.01) C01B 33/38 (2006.01)

Patent

CA 1334619

For the preparation of crystalline sodium silicates hav- ing a sheet structure and an SiO2/Na2O 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°C. Thereafter, the spray-dried sodium silicate is heated in an ignition zone containing an agitated solid bed at temperatures of 500 to 800°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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