Green and sustainable route for the efficient leaching and recovery of valuable metals from spent Ni-Cd batteries

被引:28
作者
Rana, Masud [1 ]
Khan, Md Ishtiaq Hossain [1 ]
Nshizirungu, Theoneste [1 ]
Jo, Young-Tae [1 ]
Park, Jeong-Hun [1 ]
机构
[1] Chonnam Natl Univ, Dept Environm & Energy Engn, 77 Yongbong Ro, Gwangju 61186, South Korea
基金
新加坡国家研究基金会;
关键词
Spent Ni-Cd batteries; Response surface methodology; Recycling; Formic acid; Hydrogen peroxide; NICKEL-CADMIUM BATTERIES; ELECTROCHEMICAL RECOVERY; NEGATIVE ELECTRODES; SOLVENT-EXTRACTION; SEPARATION; ACID; COBALT; KINETICS; LIQUORS; MIXTURE;
D O I
10.1016/j.cej.2022.140626
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Recycling of Ni, Cd and Co from spent Ni-Cd batteries is significant for preventing nickel and cobalt deficiency and protecting the environment. Although several studies have developed methods for recycling these metals from spent Ni-Cd batteries, the simultaneous leaching (extraction) and recovery of Ni, Cd and Co via an environmentally benign and economical manner is still challenging. Herein, a formic acid-assisted method for leaching and recovering valuable metals from the cathode and anode materials of spent Ni-Cd batteries is proposed. The effects of temperature, time, and liquid/solid ratio on Ni, Cd, and Co leaching were also exten-sively investigated. The single factor experimental results and statistical analysis revealed that more than 95 % leaching efficiencies of Cd and Co could be achieved from the cathode and anode materials at 80 degrees C and 2.5 h, while a maximum of 81 % Ni leaching was attained in formic acid at 90 degrees C, 4 h and a 30 mL/g liquid/solid ratio. Moreover, the statistical analysis results revealed that the temperature and time had significant effect (rho < 0.0001) on Ni and Cd leaching. It was difficult to leach metallic Ni present in the cathode material because of its high inertness property; however, a conversion of 99.70 % Ni was achieved at 60 degrees C for 2 h when H2O2 (15 %, v/ v) was used as an oxidizing agent. The findings of this study suggest that the formic acid-assisted recycling process could be a sustainable alternative for the efficient leaching and recovery of valuable metals from spent Ni-Cd batteries because it features a reduced highly corrosive acid consumption, mild leaching conditions, and less environmental footprints.
引用
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页数:15
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