C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 21/06 (2006.01) C22B 9/10 (2006.01) C22B 21/00 (2006.01)
Patent
CA 2085056
ABSTRACT OF THE DISCLOSURE A system process for treating aluminum salt cake containing water soluble halide salts and aluminum. The salt cake is contacted in a treatment tank with water having a temperature not less than about 250°C for a time sufficient to dissolve halide salts to form a saturated brine solution and to hydrate aluminum oxide. The hydrated aluminum oxide may be separated from the saturated brine solution and aluminum oxides and thereafter mixed with caustic to form sodium aluminate which is separated for further treatment. The saturated brine solution is cooled to a temperature of less than about 20°C to precipitate halide salts, which are separated. The brine solution may be cooled again to about 0°C to precipitate additional salts. Then the brine is reheated to a temperature not less than about 250°C by passing the cooled brine solution in heat exchange relationship with heated saturated brine solution leaving the treatment tank. The heated brine solution is introduced into the treatment tank with aluminum salt cake previously in the treatment tank for a time sufficient to form a saturated brine solution at a temperature in the range of from about 250°C to about 375°C.
Bassam Jody J.
Bonsignore Patrick V.
Daniels Edward J.
Bassam Jody J.
Bonsignore Patrick V.
Daniels Edward J.
Osler Hoskin & Harcourt Llp
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