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Extraction of Molybdenum and Rhenium from Concentrates by Electrooxidation.

Lindstrom RE; Scheiner BJ
NTIS: PB 225 345 :12 pages
Electrooxidation techniques were investigated on a bench scale by the Bureau of Mines to determine the applicability of the process for extracting molybdenum and rhenium from low-grade molybdenite concentrates. Parameters affecting the extraction, such as pulp density, power consumption, reagent requirements for ph control, and electrolytic cell configuration, were studied. Molybdenum and rhenium extractions of 98 to 99 percent were achieved from several concentrates containing 4.76 to 28.6 percent molybdenum and 180 ppm to 1,000 ppm rhenium. Optimum results were obtained by maintaining ph values between 5.5 and 7.0 During electrolysis and allowing the final ph to rise to about 8.2. Reagent consumption was 4 to 6 pounds of sodium carbonate per pound of molybdenum extracted. The power consumption declined from a range of 12 to 25 kilowatt-hours per pound of molybdenum extracted with immersion electrodes to 9.7 Kilowatt-hours with a bipolar flow-through cell; however, molybdenum extraction was independent of cell configuration.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7802
NIOSH Division
Source Name
NTIS: PB 225 345
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division