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Recovering metallic Pb directly from lead smelting dust by NaOH-carbon roasting process
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.jmrt.2020.01.007
Jingxin Liu , Simian Huang , Kai Chen , Jinping Li , Teng Wang , Meng Mei

Systematic chemical and mineralogical analyses were conducted for the dust generated in the Shuikoushan (SKS) lead smelting process, based on the results, an alternative strategy of direct metallic Pb recovery was proposed using NaOH–carbon roasting process. The reduction thermodynamics of PbSO4 was discussed, and the influencing parameters, including NaOH/dust mass ratio, carbon/dust mass ratio, roasting temperature and roasting time, were investigated systematically by experiments. The results indicated that increasing in the operation conditions was beneficial for the improved Pb recovery rate, and the reaction mechanism in this study was presumed as PbSO4CPbSNaOHPb. The optimal conditions were determined as NaOH/dust mass ratio of 1.0, carbon/dust mass ratio of 0.2, roasting temperature of 650 °C and roasting time of 180 min. Under these conditions, 87.33% of Pb in the dust was directly recovered as metal pellets, gathering 96.48% of Bi, and 97.06% of As was converted into the alkali solution, while Zn and Cd were retained in the leaching residue. This process is clean and environmentally friendly for recovery of secondary resources bearing high content of PbSO4.



中文翻译:

NaOH-碳焙烧法直接从铅冶炼粉尘中回收金属铅

对水口山(SKS)铅冶炼过程中产生的粉尘进行了系统的化学和矿物学分析,根据结果,提出了使用NaOH-碳焙烧工艺直接回收金属铅的替代策略。讨论了PbSO 4的还原热力学,并通过实验系统地研究了其影响因素,包括NaOH /粉尘质量比,碳/粉尘质量比,焙烧温度和焙烧时间。结果表明,增加操作条件有利于提高铅的回收率,推测该反应机理为Ø4C氢氧化钠铅含量。确定的最佳条件为:NaOH /粉尘质量比为1.0,碳/粉尘质量比为0.2,焙烧温度为650°C和焙烧时间为180分钟。在这种条件下,粉尘中的Pb以金属颗粒的形式直接回收,收集了96.48%的Bi,并将97.06%的As转化为碱溶液,而Zn和Cd则保留在浸出残渣中。此过程清洁且对环境友好,可回收含有高含量PbSO 4的二次资源。

更新日期:2020-01-14
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