JOM

, Volume 38, Issue 6, pp 18–22 | Cite as

Ferric Chloride, Thiourea and Brine Leach Recovery of Ag, Au and Pb from Complex Sulfides

  • R. G. Sandberg
  • J. L. Huiatt
Material Research Summary

Abstract

The Bureau of Mines recently investigated a hydrometallurgical procedure to recover gold, silver, and byproduct lead from a complex lead-zinc sulfide ore. A ferric chloride (Fecl3) preleach, at 40°C for six hours extracted about 50 percent of the zinc and formed insoluble silver and lead chlorides. Subsequent acid thiourea leaching, for one to three hours at 40°C, extracted about 85% of the gold and silver. Lead chloride was solubilized from the remaining residue with NaCl brine solution at 55°C in one hour. Lead was recovered from the brine solution in an electrolytic cell with an anion perm selective membrane at a current efficiency of 95 percent and current density of 100 A/m2. Spent FeCl3 leach solution was reoxidized in the anode compartment at a current efficiency between 75 and 95 percent.

References

  1. 1.
    P.M.J. Gray, “Metallurgy of the Complex Sulfide Ores,” Min. Mag., 151, (4) (1984), pp. 315–321.Google Scholar
  2. 2.
    R.M.G.S. Berezowsky and V.B. Sefton, “Recovery of Gold and Silver From Oxidation Leach Residues by Ammoniacal Thiosulfate Leaching,” (Presented at 108th Soc. Min. Eng. AIME Ann. Meeting, New Orleans, LA, Feb. 18–22, 1979, Soc. Min. Eng. AIME preprint 79–178), p. 17.Google Scholar
  3. 3.
    R.G. Schulze, “New Aspects in Thiourea Leaching of Precious Metals,” J. Metals, 36, (6) (1984), pp. 62–65.Google Scholar
  4. 4.
    C.L. Mantell, Electrochemical Engineering (McGraw- Hill, 4th ed. 1960), p. 42.Google Scholar
  5. 5.
    F.P. Haver and M.M. Wong, “Ferric Chloride-Brine Leaching of Galena Concentrate,” BuMines RI 8105 (1976) p. 17.Google Scholar
  6. 6.
    W.W. Simpson, L. Peterson and R.G. Sandberg, “Gold and Silver Recovery From Thiourea Leach Solutions,” (Presented at Pacific NW Met. and Miner. Conf., Portland, OR, May 1, 1984). Available from R.G. Sandberg, BuMines, Salt Lake City, UT.Google Scholar
  7. 7.
    E.R. Cole, Jr., A.Y. Lee and D.L. Paulson, “Electrolytic Method for Recovery of Lead From Scrap Batteries,” BuMines RI 8602 (1981) p. 19.Google Scholar
  8. 8.
    C.J. Krauss, “Cathode Deposit Control in Lead Electrowinning,” J. Metals, 28 (Nov. 1976), pp. 4–8.Google Scholar
  9. 9.
    R.C. Kerby and H.E. Jackson, “Organic Leveling Agents for Electrolytic Lead Refining,” Metall. Soc. CIM, 1978, pp. 125–131.Google Scholar
  10. 10.
    M.J. Kramer, P.F. Duby and P.D. Parker, “Electrowinning of Lead From Complex Chloride Solutions” (Paper in Chloride Electrometallurgy, ed. by P.D. Parker. Metall. Soc. AIME, Warrendale, PA, 1982) pp. 77–87.Google Scholar
  11. 11.
    Ionics Inc. (Watertown, MA), “Anion-Transfer Membranes,” Bull. AR 103.O-E, (Mar. 1982) p. 3.Google Scholar

Copyright information

© TMS 1986

Authors and Affiliations

  • R. G. Sandberg
  • J. L. Huiatt

There are no affiliations available

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