碳酸钠浓度对废电池铅膏脱硫影响机制与动力学

摘要以铅膏为研究对象，采用碳酸钠为脱硫剂，系统研究了碳酸钠浓度对铅膏脱硫率及铅收得率的影响，并借助化学分析、扫描电镜分析仪（SEM-EDS）、X射线衍射分析仪（XRD）揭示了铅膏脱硫反应机理，计算了动力学参数。结果表明，铅膏脱硫率随碳酸钠浓度的增加而增大，而铅收得率变化规律相反。铅膏主要由硫酸铅及铅的氧化物组成。在碳酸钠浓度小于0.150 mol/L时，脱硫产物中主要以PbCO₃和Pb₃（CO₃）₂（OH）₂形式存在；随着浓度的增加，PbCO₃不断向Pb₃（CO₃）₂（OH）₂转化，并最终转化为NaPb₂（CO₃）₂（OH）₂，导致铅收得率降低。铅膏脱硫过程活化能随浓度的增大而减小，受化学反应控制。浓度低于0.208 mol/L时，活化能降低幅度较大，由7.275 kJ/mol降至5.312 kJ/mol，之后活化能随浓度的增加变化程度较小。

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	李林波
	莫川
	邢相栋
	王莎

关键词：铅膏脱硫率反应机理碱式碳酸铅

Abstract： With sodium carbonate as desulfurizer, the influence of Na₂CO₃ concentration on desulfurization rate of lead paste and yield of lead was systematically studied. Meanwhile, the desulfurization mechanism of lead paste was revealed by chemical analysis, SEM-EDS, XRD. And the kinetic parameters were also calculated. The results showed that the desulfurization rate of lead paste increased as the increasing of Na₂CO₃ concentration, while the change of the yield of lead was opposite. Lead paste was mainly composed of lead sulfate and lead oxide. When the Na₂CO₃ concentration was less than 0.150 mol/L, the desulfurization products were mainly in the form of PbCO₃ and Pb₃(CO₃)₂(OH)₂. As the concentration went up, PbCO₃ would be converted to Pb₃(CO₃)₂(OH)₂, and finally to NaPb₂(CO₃)₂(OH)₂, resulting in the loss of lead. The activation energy of desulfurization process decreased with the increasing of concentration, and the restrictive step was chemical reaction. When the concentration was lower than 0.208 mol/L, the activation energy decreased significantly from 7.275 kJ/mol to 5.312 kJ/mol. Then, the activation energy changed slightly.

Keywords： lead paste； desulfurization rate； reaction mechanism； basic lead carbonate

Received 2019-08-27;

Fund:国家自然科学青年基金项目（51604209）。

Corresponding Authors: 邢相栋,E-mail:610504108@qq.com。 Email: 610504108@qq.com

About author: 李林波(1973-),男,博士,教授,主要从事冶金二次资源高效利用。

引用本文:

李林波, 莫川, 邢相栋, 王莎.碳酸钠浓度对废电池铅膏脱硫影响机制与动力学[J]. 化学工业与工程, 2020,37(6): 72-79

Li Linbo, Mo Chuan, Xing Xiangdong, Wang Sha.Mechanism and Kinetics of Sodium Carbonate Concentration on Desulfurization of Waste Battery Lead Paste[J]. Chemcial Industry and Engineering, 2020,37(6): 72-79

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