Recovery of Nickel,Cobalt and Rare Earth from Negative Electrode Materials for Asymmetric Electrochemical Battery with Oxidizing Acid LeachingChinese Full Text
Zhang Yali;Jiang Zhijun;Yu Xianjin;Huang Wenqiang;Wang Qinglong;College of Chemical Engineering,Shandong University of Technology;Zibo Guoli New Power Source Technology Co.,Ltd.;Zibo Engineering Technology Research Center of Asymmetric Large Power Capacitor Battery;
Abstract: Having the advantage of energy density of nickel-metal hydride battery and power density of asymmetric super capacitors,negative electrode materials for asymmetric electrochemical battery have a broad application prospect. It is not only the demand of environmental protection,but also the resource recycling to recovery metals from negative electrode materials for asymmetric electrochemical battery. Nickel,cobalt and rare earth were leached from negative electrode materials for asymmetric electrochemical battery in sulfuric acid using H2O2 as oxygenant. The leaching mechanism of nickel and cobalt was studied,it was found that Ni and Co had high solubility when the p H was less than 6. 5,and the leaching of cobalt took precedence over nickel. Also the influences of amount of oxygenant,leaching temperature,acid concentration,liquid-solid ratio and leaching time on leaching rates of nickel,cobalt and rare earth were investigated through single factor experiments. The results showed that the leaching rates of Ni and Co increased with the rise of temperature,and reached the maximum at 353 K. Yet the leaching effect of Ce was better at room temperature. The leaching rates of Ni,Coand Ce increased with the increase of the amount of oxygenant,acid concentration,liquid-solid ratio and leaching time. When the leaching efficiencies of nickel,cobalt and rare earth were 99. 4%,99. 7% and 96. 5%,respectively,the optimal conditions were as follows: the dosage of H2O2 was 8 ml,and c（ H2SO4） = 190 g·L- 1,T = 353 ℃,L/S ratio = 9∶ 1,t = 20 min,then cooled to 293 K and agitation leached for 90 min. The proposed flow sheet was rare earth recovery by Na2SO4→nickel and cobalt recovery by Na OH. This process flow can be applied in the extraction of metals from negative electrode materials for asymmetric electrochemical battery and similar materials effectively in industry.
- DOI：
10.13373/j.cnki.cjrm.2014.06.026
- Series：
- Subject：
- Classification Code：
TF815;TF816;TF845
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