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Recovery of Nickel and Cobalt from Low-Grade Domestic Laterites.


PB241218

Publication Date 1975
Personal Author Siemens, R. E.; Good, P. C.; Stickney, W. A.
Page Count 20
Abstract A process is being developed by the Bureau of Mines to selectively recover nickel and cobalt from low-grade domestic laterites. In laboratory evaluation of the process, the oxides in the laterite were selectively reduced with carbon monoxide at temperatures from 350 to 600C. For material containing more than about 5 percent magnesia, pyrite additions or post reduction heat treatments were necessary to achieve satisfactory nickel and cobalt extraction for this range of reduction temperatures. Multistage leaching of the reduced material at ambient temperature and pressure in the presence of oxygen, ammonium sulfate, and ammonium hydroxide extracted up to 92 and 87 percent of the contained nickel and cobalt, respectively. The nickel was selectively recovered from the leach solution by solvent extraction and was then stripped from the loaded organic with dilute sulfuric acid to provide a nickel-rich electrolyte. Treatment of the raffinate with hydrogen sulfide, resulted in the recovery of cobalt as a sulfide. The only contaminant in solution was magnesium which was removed by ion exchange or precipitation.
Keywords
  • Cobalt
  • Nickel
  • Laterites
  • Reduction(Chemical)
  • Carbon monoxide
  • Leaching
  • Extraction
  • Electrowinning
  • Ammonium hydroxide
  • Ammonium sulfate
  • Extractive metallurgy
  • Magnesium
  • Low grade deposits
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 71N - Nonferrous Metals & Alloys
Corporate Authors Bureau of Mines, Albany, Oregon. Albany Metallurgy Research Center.
Document Type Technical Report
Title Note Rept. of investigations.
NTIS Issue Number 197514
Recovery of Nickel and Cobalt from Low-Grade Domestic Laterites.
Recovery of Nickel and Cobalt from Low-Grade Domestic Laterites.
PB241218

  • Cobalt
  • Nickel
  • Laterites
  • Reduction(Chemical)
  • Carbon monoxide
  • Leaching
  • Extraction
  • Electrowinning
  • Ammonium hydroxide
  • Ammonium sulfate
  • Extractive metallurgy
  • Magnesium
  • Low grade deposits
  • Bureau of Mines
  • 48A - Mineral Industries
  • 71N - Nonferrous Metals & Alloys
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