Mechanism and Kinetics of Sodium Carbonate Concentration on Desulfurization of Waste Battery Lead Paste

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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.

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	Articles by authors
	Li Linbo
	Mo Chuan
	Xing Xiangdong
	Wang Sha

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

Received 2019-08-27;

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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,V37(6): 72-79

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