Separation of polymetallic sulphides by froth flotation
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United States of America Patent
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Aug 28, 1990
Issued Date -
N/A
app pub date -
Aug 29, 1989
filing date -
May 11, 1988
priority date (Note) -
Expired
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Abstract
A new depressant composition is provided for the enhanced separation into separate value metal concentrates of copper, nickel, zinc, lead present in polymetallic and massive sulphide ores. The depressant is added in an aqueous solution prepared by dissolving first a mixture of quebrachio and dextrin, or quebracho and guar gum. To the solution of modified quebracho a water soluble salt of lignin sulphonate is added. The aqueous polymer of modified quebracho lignin sulphonate is further mixed with one or more of the following inorganic reagents: water soluble cyanide, metal sulphates and water soluble sulphites. The resulting depressant is added together with conventional flotation reagents in conventional mineral separation stages as required.
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