Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Reductive Precipitation of Platinum and Palladium with Hydrazine in Hydrochloric Acid Solution

염산용액에서 하이드라진에 의한 백금과 팔라듐의 환원석출

  • Kim, Min-seuk (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division) ;
  • Kim, Byung-su (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division) ;
  • Yoo, Jae-min (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division) ;
  • Yoo, Kyoung-keun (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division) ;
  • Lee, Jae-chun (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division) ;
  • Kim, Won-baek (Korea Institute of Geoscience & Mineral Resources(KIGAM), Minerals & Materials Processing Division)
  • 김민석 (한국지질자원연구원 자원활용소재연구부) ;
  • 김병수 (한국지질자원연구원 자원활용소재연구부) ;
  • 유재민 (한국지질자원연구원 자원활용소재연구부) ;
  • 유경근 (한국지질자원연구원 자원활용소재연구부) ;
  • 이재천 (한국지질자원연구원 자원활용소재연구부) ;
  • 김원백 (한국지질자원연구원 자원활용소재연구부)
  • Received : 2008.01.14
  • Published : 2008.04.22
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Abstract

The reductive precipitation of platinum and palladium in hydrochloric acid solution using hydrazine as a reducing agent was investigated. The reductive precipitation ratios of platinum and palladium increased when increasing the stoichiometric ratio for reducing agent, precipitation time, and pH. The precipitation ratio of platinum was much lower than that of palladium. This is the reason the reaction rate of $PtCl{_6}^{2-}{\rightarrow}PtCl{_4}^{2-}$ at the reduction reaction step of $PtCl{_6}^{2-}{\rightarrow}PtCl{_4}^{2-}{\rightarrow}Pt$ is very slow. The purity of platinum precipitated was very affected by metallic impurities, while it was possible to precipitate the high purity palladium since the precipitation rate of palladium was relatively fast. At the pH of 1.3, the precipitation temperature of $25^{\circ}C$, and the addition amounts of the hydrazine of 10 and 1.75 times the stoichiometric ratio, the reductive precipitation ratios of platinum and palladium from their hydrochloric acid solutions containing 2,000 ppm were 98.5% and 99.9% in 30 min, respectively.

Keywords

Acknowledgement

Grant : 귀금속자원 고부가가치화 복합기술 개발

Supported by : 한국지질자원연구원

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