Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Leaching behavior of copper using electro-generated chlorine in hydrochloric acid solution

전해생성(電解生成)된 염소(鹽素)에 의한 구리의 침출(浸出) 거동(擧動)

  • Kim, Eun-Young (Resources Recycling, University of Science & Technology) ;
  • Kim, Min-Seuk (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Lee, Jae-Chun (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Jung, Jin-Ki (Minerals & Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
  • 김은영 (과학기술연합대학원대학교 자원순환공학) ;
  • 김민석 (한국지질자원연구원 자원활용소재연구부) ;
  • 이재천 (한국지질자원연구원 자원활용소재연구부) ;
  • 정진기 (한국지질자원연구원 자원활용소재연구부)
  • Published : 2006.12.27
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Abstract

Leaching behavior of copper using electro-generated chlorine was investigated in hydrochloric acid solutions. When leached copper concentration was lower than 3.6g/L, the utilization efficiency of the electro-generated chlorine was close to 100% at $10mA/cm^2,\;25^{\circ}C$, 400 rpm in 1M HCl solutions. The concentration ot the leached copper over 3.6g/L caused the electrode potential to drop quietly, leading to a change or leaching mechanism. The leaching rate oi copper began to decrease at the concentration of copper 5.2g/L. This is probably due to the formation of a layer of CuCl on Cu metal in 1M HCl solutions. The leaching rate, however, was not retarded in a solution ot high chloride concentration. The high solubility of CuCl in the solution may prevent the formation of CuCl on Cu metal.

폐 PCBs중 구리의 효율적이고 친환경적인 회수기술을 개발하려는 목적으로, 염산 용액 내에서 전해 생성된 염소를 이용하여 구리의 침출거동에 관한 연구를 수행하였다. 염산농도 1M, 교반속도 400 rpm, 용액온도 $25^{\circ}C$, 전류밀도 $10mA/cm^2$에서 전해 생성된 염소의 반응초기(구리이온 농도<3.6g/L) 침출반응 이용효율은 거의 100% 이었다 침출의 진행으로 용액 내 구리 이온의 농도가 3.6g/L에 도달하면 전기화학적 산화종이 $Cl^-$에서 침출반응으로부터 생성된 $Cu^+$ 이온으로 바뀌어 전극 전위의 급격한 감소가 관찰되었다. 또한 1M염산 침출 용액 내 구리 이온의 농도가 CuCl의 용해도 한계인 5.2g/L에 도달하면 침출속도가 초기침출속도보다 약 0.5배정도 감소하였다. CuCl의 용해도 한계가 높은 $Cl^-$의 농도가 3M인 조건에서는 이러한 침출속도의 감소가 일어나지 않았으며 이는 구리 표면에 $CuCl_{(s)}$층 생성이 침출반응에 큰 영향을 주는 것을 의미한다.

Keywords

References

  1. 이재천 외 1996: 形狀分離法에 의한 魔 PCBs로부터 有價 金屬의 回收硏究, 자원리싸이클학회지, 5(3), pp. 37-43
  2. 정진기 외, 2005: 폐프린터 기판으로부터 유가금속회수를 위한 침출실험, Applied Chemistry, 9(2), pp. 269-272
  3. 오치정 외, 2001: 폐 PCBs로부터 귀금속(Au, Ag등)의 선택적 침출공정, 자원리싸이클링학회지, 10(5), pp. 29-35
  4. 김민석 외, 2005: 전해생성된 염소에 의한 폐인쇄회로기판으로부터 동의 침출, 자원리싸이클링학회지, 5(14), pp. 45-53
  5. E-Y Kim et al., 2006: Leaching of copper from waste printed circuit boards using electrogenerated chlorine in hydrochloric acid solution, Proceedings of TMS2006 135th annual meeting & exhibition, pp. 929-933, TMS, Henry B. Gonzalez Convention Center, San Antonio, Texas, 12-16 March 2006, USA
  6. Hiroshi, M. et al., 1990: Fundamental studies on chlorine behavior as related to zinc electrowinning from aqueous chloride electrolytes, Metallurgical Transactions B, 21B, pp. 251-258
  7. Vinals, J., Olivera, L, and Nunez, C., 1986: Leaching kinetics of natural cobalt triasenide in chlorine solutions, Metallurgical Transactions B, 17B, pp. 629-637
  8. Dalton, R.F et al., 1991: The Cuprex metal extraction process: recovering copper from sulfide ores, JOM, 43(8), pp. 51-56
  9. Hoffmann, J.E., 1991: Winning copper via chloride chemistry-an elusive technology, JOM, 43(8), pp. 48-50
  10. Wang, S., 2005: Copper leaching from chalcopyrite concentrates, JOM, 57(7), pp. 48-51
  11. Winand, R, 1991: Chloride hydrometallurgy, Hydrometallurgy, 27, pp. 285-316 https://doi.org/10.1016/0304-386X(91)90055-Q
  12. Hubli, R.C., et al., 1995: Kinetics of millerite dissolution in cupric chloride solutions, Hydrometallurgy, 38, pp. 149-159 https://doi.org/10.1016/0304-386X(94)00047-7
  13. Herreros, 0., Quiroz, R, Vinals, J., 1999: Dissolution kinetics of copper, white metal and natural chalcocite in $Cl_2/Cl^-$ media, Hydrometallurgy, 51, pp. 345-357 https://doi.org/10.1016/S0304-386X(98)00085-1
  14. Fritz, J.J., 1982: Solubility of cuprous chloride in various soluble aqueous chlorides, Journal of Chemical and Engineering Data, 27(2), pp. 188-193 https://doi.org/10.1021/je00028a027
  15. Lin, H.K., .Wu, X.J., and Rao, P.D., 1991: The electrowinning of copper from a cupric chloride solution, JOM, 43(8), pp. 60-65
  16. Herreros, O. et al., 2005: Dissolution kinetics of metallic copper with $CuSO_4$-NaCl-HCl, Hydrometallurgy, 77, pp. 183-190 https://doi.org/10.1016/j.hydromet.2004.11.010