Carbonate transformation process and reaction kinetics of lead paste from spent lead-acid batteries

被引：0
|
作者：
Liu W.-K. [1 ]
Qin Q.-W. [1 ]
Li D.-Q. [1 ]
Gao Y.-M. [1 ]
Liu Y. [1 ]
Chen J.-Z. [2 ]
机构：
[1] Key Laboratory for Ferrous Metallurgy and Resources Utilization, Ministry of Education, Wuhan University of Science and Technology, Wuhan
[2] Hubei Jinyang Metallurgical Incorporated Co., Ltd.
来源：
Qin, Qing-Wei (qingweiqin@126.com) | 1934年 / Central South University of Technology卷 / 30期
关键词：
Carbonate transformation; Desulfurization rate; Lead paste; Reaction kinetics; XRD characterization;
D O I：
10.11817/j.ysxb.1004.0609.2020-39349
中图分类号：
学科分类号：
摘要：
Carbonate conversion process has important research significance as the crucial step of recovering spent lead paste via hydrometallurgical methods. Based on the analysis of lead paste component from spent lead-acid batteries, the desulfurization efficiencies of different conversion agent in the same condition was determined as follow from high to low: Na2CO3, (NH4)2CO3, NH4HCO3. The transformation products were characterized by XRD. The kinetics mechanism of desulfurization process by (NH4)2CO3 was discussed. The results show that PbSO4 can be transformed into pure PbCO3 through (NH4)2CO3 and NH4HCO3. However, the transformation product desulfurized by Na2CO3 contains impurities phase NaPb2(CO3)2OH. The optimum processing conditions using (NH4)2CO3 as transforming agent are also detected and determined as follows: c((NH4)2CO3) of 0.5 mol/L, reaction temperature of 50℃, reaction time of 60 min, stirring speed of 500 r/min, L/S of 5:1, more than 95.66% of PbSO4 is transformed in this optimum condition. The apparent activation energy is calculated as 16.471 kJ/mol and the reaction obeyed shrinking-core model based on the diffusion controlled, as well as the general equation of kinetics of the desulfurization process is established. © 2020, Science Press. All right reserved.
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页码：1934 / 1941
页数：7
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