Reductive smelting of spent lead–acid battery colloid sludge in a molten Na_2CO_3 salt  

作　　者：Yu-jie Hu Chao-bo Tang Mo-tang Tang Yong-ming Chen 

机构地区：[1]School of Metallurgy and Environment, Central South University [2]School of Metallurgy Engineering, Hunan University of Technology

出　　处：《International Journal of Minerals,Metallurgy and Materials》2015年第8期798-803,共6页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Nature Science Foundation of China (Nos. 51234009 and 51104182);the Natural Science Foundation of Hunan Province, China (No. 13JJ5035);the Scientific Research Fund of Hunan Provincial Education Department, China (No. 14C0349)

摘　　要：Lead extraction from spent lead–acid battery paste in a molten Na2CO3 salt containing Zn O as a sulfur-fixing agent was studied. Some influencing factors, including smelting temperature, reaction time, Zn O and salt dosages, were investigated in detail using single-factor experiments. The optimum conditions were determined as follows: T = 880°C; t = 60 min; Na2CO3/paste mass ratio = 2.8:1; and the Zn O dosage is equal to the stoichiometric requirement. Under the optimum conditions, the direct recovery rate of lead reached 98.14%. The results suggested that increases in temperature and salt dosage improved the direct recovery rate of lead. XRD results and thermodynamic calculations indicated that the reaction approaches of lead and sulfur were Pb SO4→Pb and Pb SO4→Zn S, respectively. Sulfur was fixed in the form of Zn S, whereas the molten salt did not react with other components, serving only as a reaction medium.Lead extraction from spent lead–acid battery paste in a molten Na2CO3 salt containing Zn O as a sulfur-fixing agent was studied. Some influencing factors, including smelting temperature, reaction time, Zn O and salt dosages, were investigated in detail using single-factor experiments. The optimum conditions were determined as follows: T = 880°C; t = 60 min; Na2CO3/paste mass ratio = 2.8:1; and the Zn O dosage is equal to the stoichiometric requirement. Under the optimum conditions, the direct recovery rate of lead reached 98.14%. The results suggested that increases in temperature and salt dosage improved the direct recovery rate of lead. XRD results and thermodynamic calculations indicated that the reaction approaches of lead and sulfur were Pb SO4→Pb and Pb SO4→Zn S, respectively. Sulfur was fixed in the form of Zn S, whereas the molten salt did not react with other components, serving only as a reaction medium.

关 键 词：lead–acid batteries molten salts lead smelting des 

分 类 号：TM912[电气工程—电力电子与电力传动]