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Behavior of the High Temperature Oxygen Pressure Leaching of Chalcopyrite in Sulfuric Acid Solution  

Eom, Hyoung-Choon (Korea University of Science and Technology)
Yoon, Ho-Sung (Korea Institute of Geoscience and Mineral Resources)
Yoo, Kyoung-Keun (Korea Institute of Geoscience and Mineral Resources)
Sohn, Jeong-Soo (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.16, no.3, 2007 , pp. 44-49 More about this Journal
Abstract
In the present work, the high temperature oxygen pressure leaching behavior of chalcopyrite was studied in sulfuric acid solution. The influence of leaching time, temperature and oxygen partial pressure on leaching process were examined. Leaching rate of copper increased significantly with increasing leaching temperature. Copper recovery reached 87.1% within 2 hours at $200^{\circ}C$ and 10 atm oxygen pressure, while most of the solubilized iron readily re-precipitates as hematite($Fe_2O_3$). It was confirmed that e main leach reaction of chalcopyrite occurred through oxidation with oxygen under oxygen pressure and high temperature(above $150^{\circ}C$). Because sulfur was oxidized entirely to sulfate, passivating elemental sulfur layer was not formed.
Keywords
Chalcopyrite; High temperature; Oxygen pressure; Sulfuric acid leaching;
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