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Technological conditions and kinetics of leaching copper from complex copper oxide ore

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【作者】 孙锡良陈白珍杨喜云刘有源

【Author】 SUN Xi-liang1,2,CHEN Bai-zhen2,YANG Xi-yun2 ,LIU You-yuan2 (1. School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China; 2. School of Physics Science and Technology,Central South University,Changsha 410083,China)

【机构】 School of Metallurgical Science and Engineering,Central South UniversitySchool of Physics Science and Technology,Central South University

【摘要】 The kinetic behavior of leaching copper from low grade copper oxide ore was investigated. The effects of leaching temperature,H2SO4 concentration,particle size of crude ore and agitation rate on the leaching efficiency of copper were also evaluated. And the kinetic equations of the leaching process were obtained. The results show that the leaching process can be described with a reaction model of shrinking core. The reaction can be divided into three stages. The first stage is the dissolution of free copper oxide and copper oxide wrapped by hematite-limonite ore. At this stage,the leaching efficiency is very fast (leaching efficiency is larger than 60%). The second stage is the leaching of diffluent copper oxides,whose apparent activation energy is 43.26 kJ/mol. During this process,the chemical reaction is the control step,and the reaction order of H2SO4 is 0.433 84. The third stage is the leaching of copper oxide wrapped by hematite-limonite and silicate ore with apparent activation energy of 16.08 kJ/mol,which belongs to the mixed control.

【Abstract】 The kinetic behavior of leaching copper from low grade copper oxide ore was investigated. The effects of leaching temperature,H2SO4 concentration,particle size of crude ore and agitation rate on the leaching efficiency of copper were also evaluated. And the kinetic equations of the leaching process were obtained. The results show that the leaching process can be described with a reaction model of shrinking core. The reaction can be divided into three stages. The first stage is the dissolution of free copper oxide and copper oxide wrapped by hematite-limonite ore. At this stage,the leaching efficiency is very fast (leaching efficiency is larger than 60%). The second stage is the leaching of diffluent copper oxides,whose apparent activation energy is 43.26 kJ/mol. During this process,the chemical reaction is the control step,and the reaction order of H2SO4 is 0.433 84. The third stage is the leaching of copper oxide wrapped by hematite-limonite and silicate ore with apparent activation energy of 16.08 kJ/mol,which belongs to the mixed control.

【关键词】 copper oxide oreH2SO4leachingkineticsactivation energy
【Key words】 copper oxide oreH2SO4leachingkineticsactivation energy
【基金】 Project(2005BA639C) supported by the National Science and Technology Development of China
  • 【文献出处】 Journal of Central South University of Technology ,中南大学学报(英文版) , 编辑部邮箱 ,2009年06期
  • 【分类号】TD952
  • 【被引频次】18
  • 【下载频次】98
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