Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Solvent Extraction of Platinum Group Metals from the leach Liquor of Spent Automotive Catalyst

자동차(自動車) 폐촉매(廢觸媒)의 침출액(浸出液)으로부터 백금족(白金族) 금속(金屬)의 용매추출(溶媒抽出)

  • Kim, Mi-Ae (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Lee, Jae-Chun (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Kim, Chi-Kwon (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Kim, Min-Seuk (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Kim, Byung-Su (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM)) ;
  • Yoo, Kyoung-Keun (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources(KIGAM))
  • 김미애 (한국지질자원연구원 자원활용소재연구부) ;
  • 이재천 (한국지질자원연구원 자원활용소재연구부) ;
  • 김치권 (한국지질자원연구원 자원활용소재연구부) ;
  • 김민석 (한국지질자원연구원 자원활용소재연구부) ;
  • 김병수 (한국지질자원연구원 자원활용소재연구부) ;
  • 유경권 (한국지질자원연구원 자원활용소재연구부)
  • Published : 2006.10.27
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Abstract

The solvent extraction for the separation of platinum group metals from the leach liquor of spent automotive catalysts has been studied. Tri-n-butyl phosphate (TBP), tri-n-octylamine (TOA) and di-n-hexyl sulfide (DHS) were used as extractants and kerosene as a diluent. The extraction behavior of platinum, palladium and rhodium has been investigated as functions of different kinds of extractants and their concentrations. In addition, the extraction behavior of the major metal impurities such as cerium, lead, iron, magnesium and aluminum has been investigated. Platinum and palladium were extracted with TBP. And platinum, palladium and rhodium were extracted with TOA. Platinum was co-extracted with palladium into the organic phase by solvent extraction using SFI-6 of DHS extractant, but only palladium was selectively extracted with SFI-6R. The selective extraction of palladium with SFI-6R was found better than that with SFI-6, but the kinetics of extraction with SFI-6R was found poor in comparison to SFI-6. The metal impurities extracted simultaneously during the extraction of platinum group metals should be removed in scrubbing and stripping processes. A suitable process has been proposed for the separation of platinum group metals from the leach liquor of spent automotive catalysts. Initially palladium was extracted with SFI-6R, followed by the separation of platinum with TBP or TOA leaving rhodium in the raffinate.

자동차 폐촉매의 침출액으로부터 백금족 금속의 분리를 위하여 용매추출에 대한 기초연구가 수행되었다. 추출제로 tri-n-butyl phosphate (TBP), tri-n-octylamine (TOA) 그리고 di-n-hexyl sulfide (DHS)를 등유에 희석하여 사용하였다. 추출제의 종류 및 농도가 백금, 팔라듐 그리고 로듐의 추출거동에 미치는 영향을 조사하였다. 또한 세륨, 납, 철, 마그네슘 그리고 알루미늄 등 침출액에 존재하는 주요 금속불순물의 추출거동도 함께 조사하였다. TBP는 백금과 팔라듐, 그리고 TOA는 백금, 팔라듐, 로듐을 동시에 추출하였다. DHS 추출제인 SFI-6에 의한 용매추출 시 백금이 팔라듐과 함께 유기상으로 추출되었으나, SFI-6R은 팔라듐만 선택적으로 추출하였다. SFI-6R은 SFI-6에 비하여 팔라듐에 대한 선택성이 우수하였으나 추출속도가 느렸다. 추출제의 종류에 따라 백금족 금속과 함께 추출되는 금속불순물들이 달라지며 세정 또는 탈거공정에서 이들을 제거하여야 한다. 자동차 폐촉매의 침출액으로부터 백금, 팔라듐 그리고 로듐을 분리하기 위하여 먼저 DHS 추출제인 SFI-6R를 사용하여 팔라듐을 분리한 다음 TBP 또는 TOA으로 백금을 추출하여 로듐과 분리하는 공정이 적절한 것으로 나타났다.

Keywords

References

  1. Hoffinan, J.E. 1988: Recovering platinum group metals from autocatalyst, Joumal of metals, 40, pp. 40-44
  2. Mishra, R.K. 1989: Recovery of platinum group metals from automobile catalytic converters - A review, Precious Metals '89, ed. by Jha, M.C. and Hill, S.D., pp. 483-501, TMS-AIME, Warrendale, PA, USA
  3. Kendall, T. 2005: Platinum 2005 Interim Review, Johnson Matthey, London, UK
  4. Habashi, Fathi, 1997: Part Six Precious Metals, Handbook of Extractive Metallurgy, Volume III, edited by Fathi Habashi, pp. 1269-1328, WILEY-VCH, Germany
  5. Watanabe, S. et al., 1991: Chapter 9 - Recovery and Refining of Precious Metals, Precious Metals Science and Technology, edited by Linda S. Benner et aI., pp. 377-378, IPMI, Allentown, PA, USA
  6. 한국자원재생공사, 1997: 제2장 백금족 금속 제련기술의 현황, 산업 폐기물로부터 백금족 금속의 회수 및 정제기술개발, 이재천 등, pp. 40-99, 한국지질자원연구원, 대전, 한국
  7. Edwards, R.I. 1976: Refining of the platinum-group metals, Journal of metals, August 1976, pp. 4-9
  8. Cleare, M.J., Charlesworth, P. and Bryson, D.J. 1979: Solvent extraction in platinum group metal processing, J. Chem. Tech. Biotechnol., 29, pp. 210-224
  9. Barnes, J.E. and Edwards, J.D. 1982: Solvent extraction at Inco's Acton precious metal refinery, Chemistry and industry, March 1982, pp. 151-155
  10. Demopoulos, G.P. 1986: Solvent Extraction in Precious Metals Refining, Journal of metals, June 1986, pp. 13-17
  11. Kim, J-H., Lee, J-c. and Lee, W-H. 1996: Solvent extraction of palladium by tributyl phosphate in HCI solution, J. of the Korean Institute of Mineral and Energy Resources Engineers, 31(1), pp. 33-39
  12. Kim, J-H. and Miller, J.D. 1998: Refining of platinum group metals by solvent extraction, J. of the Korean Institute of Mineral and Energy Resources Engineers, 35(1), pp. 37-42
  13. Lee, J-c., Jeong, J., Park, J.T., Kim, W.J. and Rhim, J.W. 2000: Solvent extraction of palladium with Di-n-hexyl sulfide from hydrochloric acid media, J. of the Korean Institute of Mineral and Energy Resources Engineers, 37(3), pp. 166-172
  14. Lee, J-c., Jeong, J-k., Kim, M-S., Kim, B-s. and Kim, C-K. 2004: Recovery of platinum group metals from spent automotive catalysts by hydrochloric acid leaching, J. of Korean Inst. of Resources Recycling, 13(5), pp. 28-36
  15. Casey, A.T., Davies, E., Meekand, T.K. and Wagner, E.S. 1967: Slovent Extraction Chemistry, pp. 327-334, North Holland, Amsterdam
  16. Shibata, J. 2002: Solvent Extraction of Precious Metals, 표면기술, 53(10), pp. 641-646
  17. Daamach, S., Cote, G. and Bauer, D. 1987: Separation of Platinum Group Metals in Hydrochloric Media: Solvent Extraction of Palladium with Dialkyl Sulphides, Separation Processes in Hydrometallurgy, Ed. by Davies, GA., Society of Chemical Industry, London, pp. 224