Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Recovery of Cu and Sn from the Bioleaching Solution of Electronic Scrap

전자(電子)스크랩의 미생물(微生物) 침출액(浸出液)으로부터 구리 및 주석의 회수(回收)에 관한 연구(硏究)

  • Ahn, Jae-Woo (Dept. of Advanced Materials Sci. & Eng., Daejin University) ;
  • Kim, Meong-Woon (Dept. of Environmental Eng., Daejin University) ;
  • Jeong, Jin-Ki (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Jae-Chun (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
  • 안재우 (대진대학교 신소재공학과) ;
  • ;
  • ;
  • Published : 2006.12.27
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Abstract

A study for recovering of copper and lead from electronic scraps has been carried out using a combination of bioleaching and solvent extraction. It was found that the citric acid generated by Aspergillus niger could be an imporant leaching agent acting in the solubilization of copper, iron, lead and tin from the electronic scrap. Copper could be selectively extracted by 10% LIX84 from the leaching solution and it recoved 99.9% of metallic copper by electrowinning process. Tin and iron were extracted from the remaining solution by 10% Alamine336 and stripped by NaCl solution. Finally, tin could be recovered as a metallic precipitates from the mixed solution of tin and iron by cementation with iron powder.

미생물 침출과 용매추출 기술을 이용하여 전자스크랩중의 구리 및 주석의 회수에 관한 연구를 실시하였다. Asperigillus niger를 이용한 미생물 침출시 신진대사 작용에 의해 구연산(citric acid)이 생성되며 이러한 구연산에 의해 전자스크랩중의 구리, 철, 주석, 납 등의 성분이 침출된다. 이러한 침출용액으로부터 먼저 10vo1.% LIX84를 이용하여 선택적으로 구리를 추출할 수 있었고, LIX84에 의해 추출 분리된 구리는 전해채취공정을 거쳐 99.9%의 금속 구리로 회수가 가능하였다. 한편, 구리가 추출 분리된 침출여액에서 주석을 회수하기 위해서 10% Alamine336을 이용하여 철 및 주석을 추출하고, 철 및 주석이 추출된 유기상을 NaCl용액을 탈거제로 사용함으로써 순수한 철 및 주석의 혼합용액을 얻었다. 이러한 혼합용액에서 철분말을 이용한 치환법으로 주석을 금속상태의 침전물로 회수가 가능하였다.

Keywords

References

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