Process for manganese removal from zinc metal bearing solutions
AssigneeNewmont Exploration Limited
InventorsLeonard Harris, Alfred K. Hanson, Jr.
Life of this patent
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Abstract
A process for the preferential removal of soluble manganous ions from a metal bearing solution, particularly a zinc sulfate solution to be subjected to electrolysis for the recovery of zinc, comprising treating said solution with an oxidant capable of oxidizing soluble manganous ion to insoluble and filterable gamma-manganese dioxide at a temperature and for a time sufficient to precipitate at least a portion of the manganese present in said solution as gamma-manganese dioxide, said oxidant being in an amount of from about 130% to 150% of the theoretical amount required for substantially total manganese removal from said solution, and separating said precipitate from said solution.
Claims9
A process for removal of soluble manganous ions from a zinc sulfate bearing solution containing the same comprising the steps of treating said solution, or a portion of said solution, with an oxidant capable of oxidizing soluble manganous ion to insoluble and filterable gamma-manganese dioxide at a temperature and for a time sufficient to precipitate at least a portion of the manganous ion present in said solution as gamma-manganese dioxide, said oxidant being in an amount of from about 130% to 150% of the theoretical amount required for substantially total manganese removal from said solution, and separating said precipitate from said solution.
In the process of recovering zinc from a manganese containing zinc concentrate wherein the concentrate is roasted and leached with an acid to solubilize the zinc, the resultant solution treated to remove any iron therefrom as jarosite, and then subjected to electrolysis to recover the zinc, the improvement comprising admixing with a portion of said solution prior to electrolysis an oxidant capable of oxidizing soluble manganous ion to insoluble and filterable gamma-manganese dioxide at a temperature and for a time sufficient to precipitate at least a portion of the manganous ion present in said solution as gamma-manganese dioxide, said oxidant being in an amount of from about 130% to 150% of the theoretical amount required for substantially total manganese removal from said solution, and separating said precipitate from said solution.
Dependencies are inferred from the claim text.