Kinetics of Copper Removal from Sulfidized Molybdenite Concentrates by Pressure Leaching

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• 作者：Rafael Padilla ; Cristian Opazo ; Maria C. Ruiz
• 刊名：Metallurgical and Materials Transactions B
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：46
• 期：1
• 页码：30-37
• 全文大小：710 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Manufacturing, Machines and Tools
  Metallic Materials
  Operating Procedures and Materials Treatment
  Characterization and Evaluation Materials
  Numerical and Computational Methods in Engineering
  
• 出版者：Springer Boston
• ISSN：1543-1916

文摘

Molybdenite concentrates produced from porphyry copper deposits contain copper as an impurity in variable quantities. To produce a high-grade molybdenite concentrate, a chemical purification method is normally practiced. In this paper, a new alternative for the copper elimination from molybdenite concentrates containing chalcopyrite by sulfidation of the molybdenite concentrate and subsequent pressure leaching in sulfuric acid-oxygen media is discussed. The results indicated that copper contained in sulfidized molybdenite concentrates can be dissolved effectively by pressure leaching at low temperature ranging from 373?K to 423?K (100?°C to 150?°C) and low oxygen pressure (303.98 to 1013.25?kPa) with negligible dissolution of molybdenum. The final molybdenite contained less than 0.2?pct Cu which is appropriate for marketing. Temperature and oxygen partial pressure have both significant influence on the copper dissolution. The kinetics of the copper dissolution was analyzed using the shrinking core model with surface chemical control. The calculated activation energy was 51?kJ/mol in the range of 373?K to 423?K (100?°C to 150?°C). The copper dissolution rate is of zero order with respect to hydrogen ion concentration, and first order with respect to oxygen partial pressure.