Recovery of thallium

Details Recovery of thallium Recovery of thallium

C - Chemistry, Metallurgy

22

B

53/341

C22B 61/00 (2006.01)

Patent

CA 1331098

RECOVERY OF THALLIUM Abstract Molten anhydrous chloride salt comprising a mixture of zinc chloride, thallous chloride, lead chloride, lead oxychloride and lead monoxide is poured into water to partially dissolve the salt and to disintegrate the undissolved portion of the salt. Sulphuric acid is added to the mixture to convert the contained lead to insoluble lead sulphate and to complete the dissolution of the contained zinc. The mixture is treated with chlorine, to oxidize the contained thallium to soluble thallic ion. Lead sulphate is removed from the mixture by filtration. The filtrate is treated with a reducing agent, preferably sulphur dioxide or a soluble sulphite, to convert dissolved thallium ion to relatively insoluble thallous chloride. The thallous chloride product is filtered off, washed, dried and packaged. The filtrate, containing the zinc originally present in the chloride salt, and a minor proportion of the thallium, is treated to recover the contained thallium.

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