The United States of America As Represented by the Secretary of

Jerry L Huiatt

Monte B Shirts

George M Potter

Don C Seidel

Philip E Thompson

Gregory E Smith

Melvin D Shurtz

Chromium values are recovered from pulverized chromite ore by agitating and aerating an aqueous pulp of said pulverized chromite ore containing an amine collector at a pulp acidity less than 2.5; and recovering a chromite containing froth as a concentrate.

Amine flotation of chromite from acidic pulps

Molybdenite (MoS.sub.2) is recovered from copper sulfide flotation concentrates by froth flotation utilizing steam-air injection into the concentrate flotation pulp at a temperature of about 70.degree. to 100.degree. C. in the presence of activated carbon and soluble sulfide reagents.

Molybdenite flotation

Sylvinite ores are treated for removal of insoluble slimes by a froth flotation technique which includes flocculating the slimes with nonionic or polyacrylamide flocculants and thereafter utilizing a nonionic or an anionic flotation collector including a mixture of fuel oil or a fatty acid and a defoamer of the glycol ester or polyglycol ester type. The flocculated slimes may also be floated with a fatty acid collector alone at low pH conditions.

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Murray, UT, United States of America

Jerry L Huiatt