Tessenderlo Kerley, Inc.

Theodore E Cook

Alexandros Dimitriadis

A method of depressing copper sulfides and iron sulfides in a molybdenite flotation recovery process that uses alkaline or alkaline earth polysulfides. The method of enriching molybdenite content from a slurry having molybdenite and at least one of iron sulfides and copper sulfides can include the steps of adding an effective amount of a depressing reagent selected from one or more alkaline polysulfides, alkaline earth polysulfides, or a mixture thereof, to the slurry, wherein the pH of the slurry is greater than about; and passing a gas through the slurry to separate material by selective flotation, and recovering the molybdenite from a froth.

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Phoenix, AZ, United States of America

Theodore E Cook