EARTH

[3812-23-03] Effect of Na₂CO₃ addition on reducing and sulfur-fixing smelting process of lead-bearing solid wastes

○Lulu Guo¹, Yongming Chen¹, Jing He¹, Chaobo Tang¹, Longgang Ye¹ (1. Central South University)

Chairman: Jae-Young Jung （Kyungpook National University）, Liyuan Chai (Central South University)

Keywords:recycling, lead-bearing wastes, reducing and sulfur-fixing smelting, distribution behavior

In order to solve the problem of recycling the lead-bearing wastes including zinc plant residues and spent lead acid battery paste ineffectively, this paper put forward a novel method called reducing and sulfur-fixing smelting, with doing research on effect of Na₂CO₃ addition on smelting process. The reducing and sulfur-fixing smelting has the advantages of short process flow, cleaning and efficiency, recovering lead and fixing sulfur by one-step smelting. The result showed that with Na₂CO₃ addition improving, the content of Pb in matte gradually decreased, leading to direct recovery rate of Pb increasing. Besides, the content of Zn in matte went up steadily, but the amount of Zn into volatile phase declined gradually. Additionally, more and more S could be fixed into slag and matte. However, Na₂CO₃ addition made no difference to distribution behavior of Fe in product and chemical composition of slag and matte.