Removing chlorine of CuCl residue from zinc hydrometallurgy by microwave roasting  

作　　者：卢帅丹 夏仡 黄昌元 吴国钦 彭金辉 巨少华 张利波 

机构地区：[1]National Local Joint Engineering Laboratory of Engineering Applications of Microwave Energy and Equipment Technology [2]Key Laboratory of Unconventional Metallurgy of Ministry of Education(Kunming University of Science and Technology) [3]Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology [4]Mengzi Metallurgy Co.Ltd.

出　　处：《Journal of Central South University》2014年第4期1290-1295,共6页中南大学学报（英文版）

基　　金：Project(51104073)supported by the National Natural Science Foundation of China

摘　　要：Most Zn hydrometallurgy factories adopt Cu2SO4 as a dechlorination reagent from zinc solution nowadays, thus much CuCl residue is produced. The existing process of treating this residue is washing with water or sodium carbonate solution, which would cause a lot of troubles to water treatment and waste discharge. A method of microwave roasting was adopted for dechlorination of CuCl residue. A 1.5 kW microwave roasting equipment with dust collection and tail gas adsorption systems was set up and applied during the experiment. By investigating the effect of temperature, heat preservation time, moisture content of raw material and grain size of samples on the dechlorination, the optimal experimental condition is obtained. When the samples with 2% moisture and <150 μm grain size are microwave roasted at 400 °C for 2 h, the Cl content turns from 14.27% to 1.35% and the dechlorination rate is as high as 90%, while that with conventional heating is only 60%-80%. The phase change of the roasting process investigated with X-ray diffraction verifies that CuCl in CuCl residue is removed by being transformed into CuO.Most Zn hydrometallurgy factories adopt Cu2SO4 as a dechlorination reagent from zinc solution nowadays, thus much CuCl residue is produced. The existing process of treating this residue is washing with water or sodium carbonate solution, which would cause a lot of troubles to water treatment and waste discharge. A method of microwave roasting was adopted for dechlorination of CuCl residue. A 1.5 kW microwave roasting equipment with dust collection and tail gas adsorption systems was set up and applied during the experiment. By investigating the effect of temperature, heat preservation time, moisture content of raw material and grain size of samples on the dechlorination, the optimal experimental condition is obtained. When the samples with 2% moisture and 〈150 μm grain size are microwave roasted at 400 °C for 2 h, the Cl content turns from 14.27% to 1.35% and the dechlorination rate is as high as 90%, while that with conventional heating is only 60%-80%. The phase change of the roasting process investigated with X-ray diffraction verifies that CuCl in CuCl residue is removed by being transformed into CuO.

关 键 词：microwave roasting zinc hydrometallurgy dechlorination CuCl residue 

分 类 号：TF813[冶金工程—有色金属冶金]