황산용액에 의한 황동광으로부터 구리 침출 시첨가제(과산화수소와 에틸렌글리콜) 및 온도의 영향
Effects of Additives (Hydrogen Peroxide and Ethylene Glycol) and Temperature on the Leaching of Copper from Chalcopyrite by Sulfuric Acid Solution
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본 연구는 황동광의 황산침출에 관한 연구로 황산 농도, 침출온도, 첨가제로 과산화수소 및 에틸렌글리콜 첨가에 따른 구리 침출거동을 조사하였다. 침출용액에 과산화수소 및 황산의 농도가 증가할수록 구리 침출률이 증가하였다. 침출온도에 따른 구리 침출률은 30 -60o C에서 상승하였으나, 70 - 80o C에서는 감소하였다. 침출된 구리의 양이 감소하는 결과는 70o C 이상의 온도에서 용액 중에함유된 과산화수소의 분해에 의한 것이었다. 80o C에서 에틸렌글리콜을 첨가하였을 경우 과산화수소의 분해가 억제되어 구리 침출률이 증가하였다. 침출 잔사의 SEM 분석 결과, 에틸렌글리콜을 첨가할 경우 침출 잔사가 다공성의 형태로 변형되는 것을 확인하였으며, 에틸렌글리콜 첨가 시 60o C 이하에서도 구리 침출률이 증가하였다.
Abstract
The leaching behaviors of copper from chalcopyrite were investigated by sulfuric acid. The leaching of copper was examined according to concentration of sulfuric acid, leaching temperature and addition of hydrogen peroxide and ethylene glycol. The concentrations sulfuric acid and hydrogen peroxide in the leaching solution were increased, the leaching efficiencies of Cu were increased. At 30-60o C, the leaching efficiency of Cu was increased but it was decreased at 70 - 80o C. The results were due to the increasing of hydrogen peroxide decomposition in the solution above 70o C. In the case of ethylene glycol added at 80o C, the decomposition of hydrogen peroxide was decreased and the leaching efficiency was increased. As a result of SEM analysis of leaching residue after leaching, the residue was found to porous form in the case of the ethylene glycol added and then the leaching efficiency of Cu was increased by the increase of surface area under 60o C with ethylene glycol.
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