Selective flotation process for separation of sulphide minerals
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United States of America Patent
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May 2, 1995
Grant Date -
N/A
app pub date -
Jun 28, 1993
filing date -
Nov 13, 1992
priority date (Note) -
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Abstract
This invention provides a process for improved separation of mono/multi-metallic sulphide minerals from significant amounts of iron sulphides, mainly pyrrhotite and/or their finely divided process middlings. The process comprises subjecting such material to a conditioning stage with at least one water-soluble sulphur-containing inorganic compound as a prerequisite step for further conditioning with nitrogen-containing organic chelating agents, preferably polyethylenepolyamines, prior to froth flotation wherein iron mineral, primarily pyrrhotite is depressed, thus allowing selective recovery of mono/multi-metallic minerals containing non-ferrous metal value(s).
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