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RISS 인기검색어
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- 저자 : 안승천(Sung-Chen Ahan) (검색결과 3 건)
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안승천(Sung-Chen Ahan),이상문(Sang-Mun Lee),김용환(Yong-Hwan Kim),정원섭(Won-Sub Chung) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.5
The current efficiency of copper anode containing impurities in copper sulfate solution for electrorefining was studied at various current type such as direct current, variable current and periodic reverse current. The passivity behavior was investigated by galvanostatic technique. The results obtained were that current efficiency of variable current was higher than those of direct current and periodic reverse current. The increased current efficiency could be explained by the formation of slime structure with lower average resistance due to variable current. The frequency of various factors in variable current condition has a greatest effect on current efficiency. It appeared that frequency increased current efficiency when increased from 1 to 4, but further increases did not have an effect.
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As, Sb, Bi, Pb가 조동의 부동태에 미치는 영향
안승천(Sung-Chen Ahan),이상문(Sang-Mun Lee),김용환(Yong-Hwan Kim),정원섭(Won-Sub Chung),정우창(Uoo-Chang Chung) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.5
The passivity behavior of copper anode containing impurities in copper sulfate solution for electrorefining process was studied at several different levels of impurities such as As, Sb, Bi and Pb. The passivity behavior was investigated by electrochemical techniques (galvanostatic, potentiodynamic and cyclic voltammetry tests) and surface analysis (optical microscopy, electron probe microanalysis, scanning electron microscopy). The results were that arsenic, antimony inhibited passivation and bismuth accelerated it and lead containing anode showed different passivity behavior from above anodes. The improved passivity characteristics could be explained by decrease in oxygen content in passivity film which resulted from a reaction among the impurities, oxygen and copper in the anode. The SEM image revealed that arsenic or antimony containing anode exhibited a porous passivity film and bismuth containing anode showed the compact passivity film and lead containing anode had loose passivity film on anode.
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황(黃) 원료(原料)로서 pyrite와 chalcopyrite를 사용(使用)한 matte 상(相)의 제조(製造) 및 침출특성(浸出特性)
박경호,남철우,장종신,안승천,김홍인,Park, Kyung-Ho,Nam, Chul-Woo,Chang, Jong-Sin,Ahan, Sung-Chen,Kim, Hong-In 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.1
Artificial mattes were prepared with adding pyrite or chalcopyrite as sulfur sources with Cu-Ni-Co-Fe alloy. The major phases identified by X-ray diffraction pattern were $(FeSi)_9S_8$, $CuFeS_2$, FeS, $Co_4S_3$, $Ni_3S_2$ and $Cu_2S$ for both mattes, and the matte prepared by adding chalcopyrite showed the higher peak of $Cu_2S$ due to high content of copper. Under optimum conditions, more than 95% copper, 90% nickel and 90% cobalt were extracted into leaching solution and sulfur concentration in the mattes did not much affect the leaching efficiency of the metals. The increase of the amount of pyrite or chalcopyrite added decreased pH in leaching solution and increased the concentration of iron ion dissolved in the leaching solution and the amount of residue. Cu-Ni-Co-Fe 함금상에 황의 원료로서 pyrite 또는 chalcopyrite를 첨가하여 매트상을 제조하는 방법에 대하여 검토하였다. 두 매트상 모두 주성분은 $(FeSi)_9S_8$, $CuFeS_2$, FeS, $Co_4S_3$, $Ni_3S_2$ 그리고 $Cu_2S$의 금속황화물 이었으며, chalcopyrite를 첨가한 매트의 경우 구리의 함량이 높아 $Cu_2S$의 피크가 더 높게 나타났다. 제조한 매트상의 침출 결과 모두 구리는 95%이상, 니켈과 코발트는 90% 이상의 침출율을 보였다. Pyrite와 chalcopyrite 첨가량이 증가할수록 침출액의 pH는 낮아지고, 용해되어 있는 철이온의 농도와 잔사량은 증가하였다. 한편 매트 중 황의 함량변화에 따른 유가금속의 침출율은 모든 시료에 대해 크게 변하지 않았으며, 다만 pyrite를 이용하여 제조한 매트의 경우에 Ni과 Co가 황 함량 증가에 따라 다소 증가하는 경향을 나타내었다.
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