Kinetics of acid-oxygen leaching of low-sulfur Ni-Cu matte atatmospheric pressure

来源期刊：中国有色金属学报(英文版)2010年第6期

论文作者：范川林 李斌川 符岩 翟秀静

文章页码：1166 - 1170

Key words：acid-oxygen leaching; Ni-Cu matte; Ni-Cu alloy; apparent activation energy; leaching kinetics

Abstract: The leaching of low-sulfur Ni-Cu matte in acid-oxygen (CuSO₄-H₂SO₄-O₂) solution at atmospheric pressure was researched. This matte was obtained from high grade Ni-Cu matte by magnetic separation, which mainly contained Ni-Cu alloy and a small quantity of sulfides. The effects of temperature, agitation speed, oxygen flow rate, particle size, acid concentration and concentration of copper ion were studied. It is found that the matte particles are leached by shrinking core mechanism and the leaching process is electrochemically controlled. In a temperature range of 30-60 ℃, the surface reaction is rate-limiting step, with an apparent activation energy of 41.9 kJ/mol. But at higher temperature (70-85℃), the rate process is controlled by diffusion through the product layer, with an apparent activation energy of 7.3 kJ/mol.

基金信息：the National Natural Science Foundation of China