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The Dow Chemical Company

Guy H Harris

Douglas W Fuerstenau

Patrice K Ackerman

Frank F Aplan

Donald M Podobnik

The present invention relates to a process for separating pyrite from sulfide ores and coal during flotation separation which comprises the depressing of pyrite with from about 0.05 to 0.75 kilograms per ton of concentrate solids, using a pyrite depressant compounds selected from the group consisting of

Pyrite depressant useful in floation separation

The present invention relates to a process for separating pyrite from sulfide ores and coal during flotation separation which comprises the depressing of pyrite with from about 0.05 to 0.75 kilograms per ton of concentrate solids using a pyrite depressant compounds selected from the group consisting of

Pyrite depressant useful in flotation separation

The present invention relates to a process for separating pyrite from sulfide ores and coal during flotation separation which comprises the depression of pyrite with from about 0.125 to 1.250 pounds per ton of 2-S thironium-ethane sulfonate (IESA) as a pyrite depressant. The aforementioned depressant is surprisingly effective in pyrite removal, being substantially independent of the pH values of the treated ore or coal, compatible with conventional collector reagents such as xanthates in the case of copper sulfide bearing ores as well as being substantially unobtrusive in not depressing other useful ore sulfides, including but limited to chalcopyrite, bornite, chalcosite, etc.

This invention relates to a method of recovering non-ferrous metal sulfides from a metal ore which comprises subjecting the metal ore, in the form of an aqueous pulp, to a froth flotation process in the presence of a flotating amount of a flotation collector wherein the collector comprises a compound which corresponds to one of the formulas ##STR1## wherein R.sup.1 is alkyl, aryl or aralkyl group wherein the aryl and aralkyl can be substituted with a halo or alkyl moiety;

Process for the recovery of non-ferrous metal sulfides

A process for the recovery of mineral values by froth flotation in an aqueous medium from mineral ores with the use of an effective amount of a mercaptan polyalkylene oxide frother.

Froth flotation process

A process for the recovery of mineral values by froth flotation in an aqueous medium from mineral ores with the use of an effective amount of a sulfide-containing polyalkylene oxide frother.

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Concord, CA, United States of America

Guy H Harris