Bacterial preoxidation of Stillwater Complex, MT, platinum-group metal flotation concentrate and recovery of plantinum-group metals by cyanidation and other leachants
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35 days 95 ATMOSPHERIC CYANIDATION Abiotic control tests acid acidophilic ambient temperature aqua regia ATCC medium 64 autoclave bacterial cultures BACTERIAL PREOXIDATION bacterium bioleaching biological activity Biological oxidation biological pretreatment bioox biooxidation process Biooxidized 17 biooxidized concentrate biooxidized material Bureau of Mines concentrate or biooxidized conducted to determine distilled water extent of sulfide extracting PGM's Extraction Platinum Palladium ferrooxidans ferrous iron g/mt Gold As received gold extraction increased sulfide oxidation inoculum leaching of Stillwater lixiviant METAL FLOTATION CONCENTRATE METALS BY CYANIDATION nickel NOTE.—Conditions nutrient medium oxidative chloride leach oxidized Extraction Platinum Palladium Rhodium Gold pct sulfide oxidation pentlandite percent Sample Sulfide pet CN PGM extraction Platinum Palladium Rhodium PLATINUM-GROUP METAL FLOTATION preleach PREOXIDATION OF STILLWATER PtFe Reno Research Center Sample Sulfide oxidized slurry solubilization Stillwater Complex Stillwater concentrate Stillwater flotation concentrate Stillwater PGM concentrate STIRRED BIOREACTOR sulfate sulfide minerals Sulfide oxidized Extraction sulfur Tests were conducted Thiobacillus thiourea U.S. Bureau