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 ef...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).展开更多
The decomposition of copper anode slime heated by microwave energy in a sulfuric acid medium was investigated. Leaching experiments were carried out in a multi-mode cavity with microwave assistance. The leaching proce...The decomposition of copper anode slime heated by microwave energy in a sulfuric acid medium was investigated. Leaching experiments were carried out in a multi-mode cavity with microwave assistance. The leaching process parameters were optimized using response surface methodology（RSM）. Under the optimized conditions, the leaching efficiencies of copper and tellurium were 99.56% ± 0.16% and 98.68% ± 0.12%, respectively. Meanwhile, a conventional leaching experiment was performed in order to evaluate the influence of microwave radiation. The mechanism of microwave-assisted leaching of copper anode slime was also investigated. In the results, the microwave technology is demonstrated to have a great potential to improve the leaching efficiency and reduce the leaching time. The enhanced recoveries of copper and tellurium are believed to result from the presence of a temperature gradient due to the shallow microwave penetration depth and the superheating at the solid-liquid interface.展开更多
基金Project(2012BAE06B05)supported by the National Science and Technology Support Program of ChinaProject(N130602004)supported by the Fundamental Research Funds for the Central Universities of China
文摘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).
基金financially supported by the National Science and Technology Support Program of China during the 12th Five-Year Plan Period (No. 2012BAE06B05)the Fundamental Research Funds for the Central Universities of China (No. N130602004)
文摘The decomposition of copper anode slime heated by microwave energy in a sulfuric acid medium was investigated. Leaching experiments were carried out in a multi-mode cavity with microwave assistance. The leaching process parameters were optimized using response surface methodology（RSM）. Under the optimized conditions, the leaching efficiencies of copper and tellurium were 99.56% ± 0.16% and 98.68% ± 0.12%, respectively. Meanwhile, a conventional leaching experiment was performed in order to evaluate the influence of microwave radiation. The mechanism of microwave-assisted leaching of copper anode slime was also investigated. In the results, the microwave technology is demonstrated to have a great potential to improve the leaching efficiency and reduce the leaching time. The enhanced recoveries of copper and tellurium are believed to result from the presence of a temperature gradient due to the shallow microwave penetration depth and the superheating at the solid-liquid interface.
