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Leaching of Metal Sulfides and the Stability of Reaction Intermediates

황화광의 침출반응 및 중간생성물의 안정도

  • Lee, Man Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Choi, Seung Hoon (Department of Chemical and Biomolecular Engineering, Seonam University)
  • 이만승 (목포대학교 신소재공학과 희유금속연구소) ;
  • 최승훈 (서남대학교 생명화학공학과)
  • Received : 2018.04.09
  • Accepted : 2018.05.15
  • Published : 2018.06.30

Abstract

Development of extractive metallurgical processes for metal sulfides has become of importance owing to the depletion of oxide ores with rich metal contents. Most of the leaching reactions of metal sulfides is electrochemical reaction and can be classified as $H_2S$, S, and ${SO_4}^{2-}$ evolution type. The acidity of leaching solution and the presence and concentration of an oxidizing agent affect the formation of reaction intermediates containing sulfur. Frost diagram of sulfuroxoanion indicates that the oxoanions with higher oxidation number are more thermodynamically stable in the presence of oxidizing agents.

고품위 산화광의 고갈로 인해 금속황화광의 제련공정의 개발이 중요해지고 있다. 금속황화광의 침출은 대부분 전기화학반응으로 크게 $H_2S$, S, ${SO_4}^{2-}$ 발생형으로 분류된다. 침출용액의 산도와 산화제의 종류 및 농도는 황의 중산생성물 형성에 큰 영향을 미친다. 산화성이 강한 침출용액에서 황 옥소음이온의 Frost도는 황의 산화수가 증가할수록 열역학적으로 안정함을 나타낸다.

Keywords

References

  1. Oxotoby, D. W., Gills, H. P. and Campion, A., 2012 : Principles of modern chemistry, pp.351-352, Cengage Learning.
  2. Habashi, F., 1999 : Textbook of hydrometallurgy, Metallurgie Extractive Quebec.
  3. Lee, M. S., Nicol, M. J., and Basson, P., 2008 : Cathodic processes in the leaching and electrochemistry of covellite in mixed sulfate-chloride media, J. Appl. Electrochem., 38, pp.363-369. https://doi.org/10.1007/s10800-007-9447-5
  4. Barrett, J., 2003 : Inorganic chemistry in aqueous solutions, pp.91-97, The Royal Society of Chemistry, London.
  5. Bard, A. J., Parsons, R. and Jordan, J., 1985 : Standard potentials in aqueous solution, pp.95-97, Marcel Dekker, Inc., NY.