Separation of polymetallic sulphides by froth flotation
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
May 11, 1988
filing date -
May 11, 1988
priority date (Note) -
Expired
status (Latency Note)
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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 quebracho 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 lighin 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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