, Volume 41, Issue 12, pp 43–45 | Cite as

A Cyanide removal process using sulfur dioxide and air

  • E. A. Devuyst
  • B. R. Conard
  • R. Vergunst
  • B. Tandi
Gold, Cyanide and the Environment Overview


A recently developed process combines sulfur dioxide and air to oxidze cyanide, removing it from industrial waste effluents. The process uses lime for pH control and copper in solution as a catalyst for cyanide oxidation. Significant advantages of the process include thoroughness of cyanide removal, operational simplicity, improved safety and lower reagent requirements. Lower costs are an additional benefit of the process.


Cyanide Cyanide Oxidation Mill Tailing Cyanide Removal Iron Cyanide 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    G.J. Borbely et al., “Cyanide Removal from Aqueous Streams,” Can. patent 1,165,474 (April 10, 1984). Covered by South Africa patent 82/0372, U.K. patent 2091713B and U.S. patent 4,537,686 (August 27, 1985). Patent applications pending in other countries.Google Scholar
  2. 2.
    R.H. Brickell, “The Removal of Cyanide from Mill Tailings,” presented at the Can. Inst. of Mining and Metallurgy 84th Annual Meeting, Quebec City, Quebec (1982).Google Scholar
  3. 3.
    Herman Erkku and Lynn S. Price, “The Treatment of Gold Milling Effluents,” presented at the 34th Annual Purdue Industrial Waste Conference (May 8—10, 1979).Google Scholar
  4. 4.
    Owen B. Mathre, “Destruction of Cyanide in Aqueous Solutions,” U.S. patent 3,617,567 (November 1971).Google Scholar
  5. 5.
    W.J. Rowley and F.D. Otto, “Ozonation of Cyanide with Emphasis on Gold Mill Wastewaters,” Can. J. Chem. Eng., 58 (October 1980), pp. 646–653.Google Scholar
  6. 6.
    Roy G. Neville, “Method for the Removal of Free and Complex Cyanides from Water,” U.S. patent 4,312,760 (January 26, 1982).Google Scholar
  7. 7.
    S. Raef et al., “Fate of Cyanide and Related Compounds in Aeration Microbial Systems,” parts I and II, Water Research, 11 (1977), pp. 477–492.Google Scholar
  8. 8.
    H.A. Burk and E.S. Pettis, “The A.L. Halvorsen Process for Recovering Cyanide from Waste Solutions,” Min. & Met. (June 1925), pp. 136–143.Google Scholar
  9. 9.
    Noyes L. Avery and William Fries, “Selective Removal of Cyanide from Industrial Waste Effluents with Ion-Exchange Resins,” Ind. Eng. Chem. Prod. Res. Dev., 14(2) (1975), pp. 102–104.Google Scholar
  10. 10.
    Wouterus J.M. Kuit and Alan R. Babcock, “Process for Removal of Cyanides from Effluent,” U.S. patent 4,250,030 (February 10, 1981).Google Scholar
  11. 11.
    Edmund Bishop and David T. White, “Electrochemical Oxidation of Cyanides,” Brit. patent 1,505,361 (March 1978).Google Scholar
  12. 12.
    S.A. Zaidi and J.B. Brodie, “Performance Evaluation of Full-Scale Alkaline Chlorination Systems, Operating at Canadian Gold Mills,” presented at the 13th Annual Hydromet. Meeting of the Can. Inst. of Mining and Metallurgy, Edmonton, Alberta (1983).Google Scholar
  13. 13.
    E.A. Devuyst, V.A. Ettel and G.J. Borbely, “New Method for Cyanides Destruction in Gold Mill Effluents and Tailing Slurries,” presented at the 14th Annual Operators Conference of the Canadian Min. Processors Div. of the CIM Ottawa, Ontario (January 19–21, 1982).Google Scholar
  14. 14.
    E.A. Devuyst, V.A. Ettel and G.J. Borbely, “New Process for Treatment of Waste Waters Containing Cyanide and Related Species,” presented at the AIME Annual Meeting, Dallas, Texas (February 14–18, 1982).Google Scholar
  15. 15.
    E.A. Devuyst et al., “A New Process for the Treatment of Waste Waters Containing Cyanide and Related Species,” presented at the 21st Annual Conf. of Met., Toronto, Ontario (August 29–September 1, 1982).Google Scholar
  16. 16.
    E.A. Devuyst, B.R. Conrad and V.A. Ettel, “Pilot Plant Operations of the Inco SO2/Air Cyanide Removal Process,” presented at the 29th Ontario Ind. Waste Conf., Toronto, Ontario (June 13–16, 1982); published in Canadian Mining Journal (August 1982), pp. 27–30.Google Scholar
  17. 17.
    E.A. Devuyst, W. Hudson and B.R. Conrad, “Commercial-Scale Trials of the Inco SO2/Air Cyanide Removal Process,” presented at the Canada/EC Seminar, Treatment of Complex Minerals, Ottawa, Ontario (October 12–14, 1982).Google Scholar
  18. 18.
    E.A. Devuyst, B.R. Conrad and W. Hudson, “Industrial Application of the SO2/Air Cyanide Removal Process,” presented at the first International Symposium on Precious Metals Recovery, Reno, Nevada (June 10–14, 1984).Google Scholar

Copyright information

© TMS 1989

Authors and Affiliations

  • E. A. Devuyst
    • 1
  • B. R. Conard
    • 1
  • R. Vergunst
    • 2
  • B. Tandi
    • 1
  1. 1.Inco LimitedUSA
  2. 2.Inco Exploration and Technical ServicesUSA

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