Process for the manufacture of lump calcium sulfate

Details Process for the manufacture of lump calcium sulfate Process for the manufacture of lump calcium sulfate

1977-12-20

1979-11-06

White, Robert F.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264109, 264117, B01J 222

Patent

active

041736109

ABSTRACT:
Pelletized calcium sulfate is prepared from finely divided, natural or synthetic calcium sulfate, wherein the particle size of the finely divided calcium sulfate is at least about 90 per cent by weight less than 200 .mu.m, there being no particles larger than 500 .mu.m, and wherein the finely divided calcium sulfate has a free water content of from about 0.5 to about 4 per cent by weight, by pressing the finely divided calcium sulfate in the presence of water with a roll press using a surface pressure of 1 to 5 Mp per cm roller length.

REFERENCES:
patent: 3231649 (1966-01-01), Pfeiffer
patent: 3414643 (1968-12-01), Collie
patent: 3789097 (1974-01-01), Beck et al.

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