Duval Corporation

Frank E Lamb

A non-polluting chemical process for recovery of metals from metal containing ores or other solid materials by:

Non-polluting process for recovery of precious metal values from ores

A chemical, electro-chemical process for recovering meta values from a zinc- or lead-containing material comprises:

Process for recovery of metal values from lead-zinc ores, even those

A hydrometallurgical process for pollution-free recovery of metallic antimony from stibnite and other antimony-containing materials by (a) reduction of ferric chloride by such materials to produce ferric chloride and antimony (III) chloride, (b) recovery of metallic antimony, preferably by electrolysis, (c) regeneration of the ferric chloride, and (d) purge of impurities. Optionally, the metallic antimony thus produced may be subsequently oxidized if desired to produce high purity antimony oxide. The process is amenable to cyclical operation.

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Tucson, AZ, United States of America

Frank E Lamb