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Intensification of pretreatment and pressure leaching of copper anode slime by microwave radiation

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Abstract

The application of microwave irradiation for pretreatment of copper anode slime with high nickel content prior to pressure sulfuric acid leaching has been proposed. The microwave-assisted pretreatment is a rapid and efficient process. Through the technology of microwave assisted pretreatment-pressure leaching of copper anode slime, copper, tellurium, selenium and nickel are almost completely recovered. Under optimal conditions, the leaching efficiencies of copper, tellurium, selenium and nickel are 97.12%, 95.97%, 95.37% and 93.90%, respectively. The effect of microwave radiation on the temperature of copper anode slime and leaching solution is investigated. It is suggested that the enhancement on the recoveries of copper, tellurium and selenium can be attributed to the temperature gradient which is caused by shallow microwave penetration depth and super heating occurring at the solid-liquid interface. The kinetic study shows that the pressure leaching of copper anode slime, with and without microwave assisted pretreatment, are both controlled by chemical reactions on the surfaces of particles. It is found that the activation energy calculated for microwave-assisted pretreatment-pressure leaching (49.47 kJ/mol) is lower than that for pressure leaching which is without microwave assisted pretreatment (60.57 kJ/mol).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Hong-ying Yang  (杨洪英), Zhi-yuan Ma  (马致远), Yang Lv  (吕阳) & Liu Xiong  (熊柳)

  2. National Engineering Laboratory of Bio-hydrometallurgy, General Research Institute forNonferrous Metals, Beijing, 100088, China

    Zhi-yuan Ma  (马致远) & Song-tao Huang  (黄松涛)

Authors
  1. Hong-ying Yang  (杨洪英)
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  2. Zhi-yuan Ma  (马致远)
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  3. Song-tao Huang  (黄松涛)
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  4. Yang Lv  (吕阳)
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  5. Liu Xiong  (熊柳)
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Corresponding author

Correspondence to Hong-ying Yang  (杨洪英).

Additional information

Foundation item: Project(2012BAE06B05) supported by the National Science and Technology Support Program of China; Project(N130602004) supported by the Fundamental Research Funds for the Central Universities of China

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Yang, Hy., Ma, Zy., Huang, St. et al. Intensification of pretreatment and pressure leaching of copper anode slime by microwave radiation. J. Cent. South Univ. 22, 4536–4544 (2015). https://doi.org/10.1007/s11771-015-3003-y

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  • DOI: https://doi.org/10.1007/s11771-015-3003-y

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