Abstract
A process has been developed for recovering zinc and other metal values from chloride-containing solid zinc waste materials such as zinc ash from galvanizing baths, and flue dusts from zinc smelting and Waelz processes. The waste is leached with a liquid organic phase containing a cation exchanger; the commercial carboxylic acid Versatic 911 is highly efficient for this operation. Halogens present in the organic phase are readily washed out with water. Zinc and other metal values are then selectively stripped with sulfuric acid, generating a neutral solution of zinc sulfate suitable for electrolytic production of zinc metal. Alternatively, zinc sulfate can be crystallized directly from the organic phase by stripping with concentrated sulfuric acid.
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