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首页> 外文会议>TMS annual meeting exhibition;International symposium on high-temperature metallurgical processing >One-Step Extraction of Lead from Spent Lead-Acid Battery Paste via Reductive Sulfur-Fixing Smelting: Thermodynamic Analysis
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One-Step Extraction of Lead from Spent Lead-Acid Battery Paste via Reductive Sulfur-Fixing Smelting: Thermodynamic Analysis

机译：还原性硫固定熔炼从废铅酸电池浆料中一步提取铅：热力学分析

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A new innovative process for one-step and cleaner extraction of lead from spent lead-acid battery by reductive sulfur-fixing smelting was presented. This paper summarized and discussed several potential sulfur-fixing agents and molten salts which can be used in this new technique. Thermodynamic analysis involving reaction mechanism, AG_T- and predominance-area diagrams of different smelting systems were performed, respectively. The results proved the technical feasibility and high-efficiency of this process. Copper oxide ash (CuO), zinc oxide ash (ZnO) and iron oxide bearing residues (Fe_xO_y) can be used as sulfur-fixing agent to extract lead through exchange reactions. Sulfur-fixed efficiency of CuO, ZnO and FeO decrease slightly in turn. Sulfur contained in PbSO_4 is fixed in form of Cu_2S, ZnS and FeS respectively which avoids SO_2 emission. The addition of molten salt can significantly decrease temperature of reductive sulfur-fixing reactions. Molten salt can be regenerated and recycled in smelting system after filtering solid residues.
机译：提出了一种新的创新工艺，该工艺可通过还原性固硫熔炼一步一步更干净地从废铅酸电池中提取铅。本文总结并讨论了可用于这项新技术的几种潜在的固硫剂和熔融盐。分别进行了涉及反应机理的热力学分析，不同熔炼系统的AG_T图和优势区图。结果证明了该工艺的技术可行性和高效率。氧化铜灰（CuO），氧化锌灰（ZnO）和氧化铁残渣（Fe_xO_y）可用作固硫剂，通过交换反应提取铅。 CuO，ZnO和FeO的固硫效率依次降低。 PbSO_4中所含的硫分别以Cu_2S，ZnS和FeS的形式固定，从而避免了SO_2的排放。熔融盐的添加可以显着降低还原性固硫反应的温度。过滤固体残渣后，熔融盐可以在熔炼系统中再生和再循环。

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