Ore halogenation process

C - Chemistry – Metallurgy – 22 – B

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C22B 5/02 (2006.01) C01F 7/56 (2006.01) C01G 1/06 (2006.01) C22B 1/08 (2006.01) C22B 21/00 (2006.01) C22B 34/12 (2006.01)

Patent

CA 1088316

ABSTRACT One of the major obstacles toward the needed and economic production of alumina and other values from kaolinitic clay and other ores by chlorination has been the slow reaction rates and low yields of the metal values. The present invention provides methods for improving reaction rates and/or yields in the halo- genation of various ores which comprises the addition of sulfur and/or functionally equivalent sulfur-con- taining compounds as an ore conditioning agent and/or reaction promoter. These improvements also permit operation at low temperatures with advantage of savings of energy and or equipment and maintenance costs. The invention is applicable to both displace- ment halogenation and carbo-halogenation processes. The sulfur and/or functionally equivalent sulfur-containing compounds can be added to the reaction mass during pre- halogenation steps or to the halogenation step or to combinations of steps ordinarily with additional benefits.

268104

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