電子스크랩에서 구리 및 주석의 回收를 위한 窒酸 浸出 및 浸出液에서 遊離窒酸 除去 硏究
Nitric acid leaching of electronic scraps and the removal of free nitric acid from the leaching solution for the recovery of copper and tin
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초록
전자스크랩중에 함유된 구리 및 주석을 습식공정으로 회수하기 위하여 기초 연구를 실시하였다. 침출제로 질산을 이용하여 분쇄된 전자스크랩에서 구리, 주석, 납, 철 등의 금속 성분들에 대한 침출율을 조사하고 최적 침출조건을 제시 하였다. 이러한 질산 침출 용액으로부터 TBP를 이용하여 유리질산을 분리•추출하여 재활용하기 위한 기초 연구를 실시하였다. 실험 결과 3.0-4.0 M 질산으로 구리를 효과적으로 침출시킬 수 있었으며, 질산 침출액 중 유리질산을 60% TBP에 의해 95%정도 추출이 가능하였고, 유기상에 추출된 질산의 98%를 증류수에 의해 탈거하여 질산침출액으로 재사용이 가능하였다.
Abstract
Fundamental study has been made on the recovery of copper from the electronic scrap by hydrometallurgical process. Nitric acid was used as a leaching agent to dissolve the metals such as Cu, Sn, Pb, Fe etc. from the crushed electronic scraps. TBP was employed to extract nitric acid from the strong nitric acid leaching solutions and to reclaim nitric acid. From the experimental results, Cu was effectively leached by 3.0-4.0 M nitric acid. And 95% of nitric acid in the leaching solution was extracted by 60% TBP, and 98% of nitric acid was stripped from the loaded organic phase by distilled water and it was possible to reuse as a leaching agent.
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