Dithiophosphates (DTP) are used mainly for selective flotation of Cu from Cu/Zn ores where Zn minerals tend to float readily. They’re also used for flotation of activated Zn sulfides where selectivity against iron sulfides presents a problem. Dithiophosphates are very selective against iron sulfides.
Monothiophosphates (MTP) are particularly effective for selective flotation of precious metals in alkaline circuits (pH > 7.0). They’re also effective in the flotation of sulfide minerals and precious metals in acid circuits. In moderately alkaline circuits (pH 7-10), they can be used for selective flotation of copper sulfide minerals and precious metals from ores in which the presence of highly activated iron sulfide minerals precludes the use of other sulfide collectors.
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