Removal of thallium from impure lead

Details Removal of thallium from impure lead Removal of thallium from impure lead

C - Chemistry, Metallurgy

22

B

53/341

C22B 61/00 (2006.01) C22B 13/06 (2006.01)

Patent

CA 1331099

REMOVAL OF THALLIUM FROM IMPURE LEAD Abstract Molten thallium-containing lead, pumped from beneath the surface of a bath of the lead, is passed through a layer of molten chloride salt in a contactor. After contacting the molten salt, the molten lead returns to the bath through a valve port at the bottom of the contactor. Thallium extracted from the circulating lead accumulates in the salt layer. Thallium-enriched molten salt is removed from the contactor by throttling the valve port and pumping lead into the contactor, forcing the layer of molten salt to rise in the contactor until it overflows through a side tube into a ladle. The preferred chloride salt is anhydrous zinc chloride.

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