C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/239
C01F 7/06 (2006.01) C01F 7/04 (2006.01) C01F 7/47 (2006.01) C22B 21/04 (2006.01)
Patent
CA 1223115
ABSTRACT OF THE DISCLOSURE: In a method of processing contaminated sodium oxalate which becomes available in a separating stage succeeding the digestion of bauxite in accordance with the Bayer process, chemicals used in the digesting process are recovered in that moist sodium oxalate which has been separated is dried with the hot exhaust gases from a rotary kiln jointly with aluminum hydroxide or aluminum oxide hydrate and/or reactive alumina at a mol ratio of aluminum to sodium of at least 0.8 and the dried product is decom- posed in said rotary kiln at a temperature of 780 to 1000°C to form sodium aluminate. Suitably drying is effected by spray drying in direct contact with the exhaust gases of the rotary kiln and decomposition is effected at a tempera- ture in the range from 850 to 950°C and with an Al:Na ratio not in excess of 1.2.
477696
Hirsch Martin
Koch Walter
Rosenthal Karlheinz
Schmidt Hans-Werner
Yetmen Yilmaz
Metallgesellschaft Aktiengesellschaft
Reynolds Metals Company
Robic Robic & Associes/associates
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