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TitleRecovery of molybdenite from talcose ores of Preissac Molybdenite Mines Limited, Cadillac, Abitibi-East, Quebec
DownloadNot digitized. Availability
AuthorMathieu, G I; Bruce, R W
SourceCanada Mines Branch, Investigation Report IR 68-56, 1968, 16 pages, Open Access logo Open Access
PublisherCanada Department of Energy, Mines and Resources
Mediapaper; on-line; digital
File formatpdf
Released1968 01 01
Four samples from the Preissac Molybdenite Mine were investigated. Three of these were Molybdenite ores of low, medium and high talc content, respectively, (0.44-0.89% MoS? ). The other was a talc-laden concentrate containing 62.4% MoS? produced in plant operation. Two methods were successful in upgrading the talc-laden concentrate to market specification (85% MoS? ). In one, coarse talc was first depressed with alum while floating molybdenite; then fine talc was floated while depressing molybdenite with Orzan. Although this produced a concentrate of 86.19% MoS?, recovery was only 62.6%. In the other, talc was deactivated by HC1 treatment before molybdenite flotation. By this technique, recovery was 90.6% at 91.6% grade. Using the same techniques, laboratory concentrates from the low-talc ore were upgraded from 65.6% MoS? to 85.1% by the alum-Orzan procedure, and up to 94.1% after talc deactivation by hydrochloric acid. With the medium-talc ore, co-flotation of the talc so diluted the molybdenite concentrate that the grade was usually below 25%, and never exceeded 40% MoS?. The quantity was insufficient for a trial of the upgrading techniques. Laboratory flotation of the high-talc ore gave no significant concentration of molybdenite.

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