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Gold and silver extraction from complex sulfide wastes



Details

  • Personal Author:
  • Description:
    The present study has demonstrated the application of different leaching techniques in the extraction of precious metals from extreme low grade materials such as zinc and lead flotation tailings. The bacterial leaching preceeding thiourea treatment seem to expose precious metal inclusions from the sulfide matrix. Preliminary results indicate gold extractions by thiourea near 60% for samples pretreated with microorganisms and about 40% for samples not treated by bacteria. In another series of experiments, the received tailings were prewashed with HCl and subsequently leached with thiourea. Extractions of gold as high as 81% have been obtained. Thiosulfate leaching at 50 deg. C resulted in highest extraction which was approximately 95%. Two step continuous countercurrent process has been proposed for the premined and preground flotation tailings. The efficiency of this approach has been demonstrated. The relative economic viability of three methods: cyanidation, thiourea leaching, and thiosulfate leaching has been discussed on basis of preliminary data obtained in this investigation and in others. Those preliminary data are encouraging but much work remains to be done in order to optimize and scale up the processes to pilot plant level. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISBN:
    9780873390071
  • Publisher:
    Metallurgical Society
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • NIOSHTIC Number:
    nn:20047117
  • Citation:
    Recycle and secondary recovery of metals: proceedings of the International Symposium on Recycle and Secondary Recovery of Metals and the Fall Extractive and Process Metallurgy Meeting, December 1-4, 1985, Fort Lauderdale, Florida. Taylor PR, Sohn HY, Jarrett N, eds. Warrendale, PA: Metallurgical Society, 1987 Feb; :715-726
  • Editor(s):
    Taylor PR; Sohn HY; Jarrett N
  • Federal Fiscal Year:
    1987
  • Performing Organization:
    New Mexico Institute or Mining and Technology
  • Peer Reviewed:
    False
  • Source Full Name:
    Recycle and secondary recovery of metals: proceedings of the International Symposium on Recycle and Secondary Recovery of Metals and the Fall Extractive and Process Metallurgy Meeting, December 1-4, 1985, Fort Lauderdale, Florida
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:940d1c9f90510640837403811e9b51966007d2981528d13d1c95a44cc4154f6c96d347ad7d492014fa3f868a5daeaf12665d5749b4d6dc1e29395ba61bc5df94
  • Download URL:
  • File Type:
    Filetype[PDF - 3.48 MB ]
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