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Malononitrile Extraction of Gold from Ores.


PB196691

Publication Date 1970
Personal Author Heinen, H. J.; Eisele, J. A.; Scheiner, B. J.
Page Count 15
Abstract Malononitrile (CH2 (CN)2), which forms a carbanion in basic solutions, was investigated as a potential leachant for gold and was shown to be an effective extractant in alkaline pulps. Malononitrile was comparable to equal molar quantities of sodium cyanide (NaCN) in leaching gold from an oxide ore and yielded 10 to 20 percent higher recovery in leaching a refractory carbonaceous ore, although dissolution was slower with malononitrile than with cyanide. Complete recovery of the gold from the pregnant solutions was achieved by coprecipitation with a lead salt on zinc dust; the leachant was shown to be capable of regeneration and recycling a limited number of times. Addition of an anion-exchange resin to the carbonaceous pulp containing malononitrile increased gold recovery from 67 to 95 percent. Some malononitrile derivatives were also shown to be gold solvents. (Author)
Keywords
  • Metalliferous minerals
  • Extractive metallurgy
  • Leaching
  • Gold
  • Benefication
  • Nitriles
  • Organic solvents
  • Anion exchanging
  • Precipitation(Chemistry)
  • Solvent extraction
  • Malononitriles
Source Agency
  • Invalid Source Agency Code
NTIS Subject Category
  • 48A - Mineral Industries
Corporate Authors BUREAU OF Mines, Washington, D.C.
Document Type Technical Report
Title Note Rept. of investigations.
NTIS Issue Number 197105
Malononitrile Extraction of Gold from Ores.
Malononitrile Extraction of Gold from Ores.
PB196691

  • Metalliferous minerals
  • Extractive metallurgy
  • Leaching
  • Gold
  • Benefication
  • Nitriles
  • Organic solvents
  • Anion exchanging
  • Precipitation(Chemistry)
  • Solvent extraction
  • Malononitriles
  • Invalid Source Agency Code
  • 48A - Mineral Industries
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