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Molybdenite Flotation.

Huiatt JL; Shurtz MD; Potter GM
U S Pat 4 231 859 1980 Nov; :
Molybdenite is recovered from copper sulfide flotation concentrates by froth flotation, with injection of air and steam into the flotation pulp at 70 deg-100 deg c and soluble sulfide reagents. Injection of steam depresses cu and fe sulfide minerals and decreases the sulfide reagent consumption. Thus, a molybdenite- chalcopyrite concentrate containing cu 26 and mo 0.4 pct was pulped to 50 pct solids, heated to 75 deg c by injection of steam and mixed with 0.5 Lb activated carbon/ton of concentrate. The pulp was conditioned with 0.034 Lb fuel oil and 4 lb (nh4)2s/ton for 2 min and then with 8 lb na2s/ton for 1 min. Methyl isobutyl carbinol was added as frother and the pulp was floated with steam-air agitation. The flotation concentrate contained mo 84.4 and cu 1.6 pct. Chem. Abstr. 90:P107,496b to improve the molybdenite flotation recovery from copper sulfide ore concentrates, the flotation pulp containing 20-60 pct solids is heated with steam injection and contains activated carbon. Steam is injected for 20-60 min to maintain the pulp at 70 deg-100 deg c, decrease oxygen content, and decompose residual flotation additives. The hot pulp is processed 2-5 min for mos2 flotation by air-steam mixtures. Chalcopyrite-molybdenite flotation concentrate (containing cu 26 and mo 0.4 pct) was pulped to 50 pct solids, modified with powdered activated carbon 0.5, Steam heated to 75 deg c, and conditioned in sequence with No. 2 fuel oil 0.034, Commercial ammonium sulfide 4.0, Na2s (60 pct) 8 lb/ton dry feed, and methyl isobutyl carbinol frot
Publication Date
Document Type
Fiscal Year
Identifying No.
P 21-80
NIOSH Division
Source Name
U.S. Pat. 4,231,859; Nov. 4, 1980; Chem. Abstr. 93:135, 801C
Page last reviewed: November 26, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division