Apparatus for treating by-product gypsum to be used as an inhibi

Details Apparatus for treating by-product gypsum to be used as an inhibi Apparatus for treating by-product gypsum to be used as an inhibi

1975-08-08

1976-12-21

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23287, 34 57A, 432 58, B01J 100, C04B 1102

Patent

active

039985962

ABSTRACT:
Apparatus comprising means for dispersing comminuted limestone in a stream of hot gas and calcining it to form quicklime; a calcining chamber into which comminuted gypsum and the stream of hot gas containing the quicklime are introduced wherein the gypsum is calcined and thoroughly mixed with the quicklime; a gas-solids separator for separating the calcined gypsum and quicklime from the gas stream; and hydration means for hydrating the quicklime and gypsum whereby any phosphoric acid in the gypsum reacts with the hydrated quicklime to form insoluble calcium phosphate.

REFERENCES:
patent: 2621034 (1952-12-01), Stecker
patent: 3047447 (1962-07-01), Stasse
patent: 3159497 (1964-12-01), Onoda
patent: 3199997 (1965-08-01), Johnson
patent: 3445323 (1969-05-01), Schnabel
patent: 3489583 (1970-01-01), Bloom et al.
patent: 3827897 (1974-08-01), Dumont
patent: 3839802 (1974-10-01), Saito et al.
patent: 3945841 (1976-03-01), Dumont

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