PbSO4 is the main component of lead paste, lead smoke and other lead-containing solid wastes. It usually matches with the primary lead concentrate to co-smelt for lead extraction, mostly in the oxidation smelting stage. The lead waste quickly experiences different temperature and atmosphere fields from feeding the furnace to the completion of the reactions. This work investigated PbSO4 decomposition kinetic and phase transformation mechanism during lead waste pyrometallurgical recycling. The results show that the activation energy of the decomposition reaction of PbSO4 at 800 ℃∼1000 ℃ in Ar atmosphere is 121.35 kJ/mol. The PbSO4 decomposition reaction in Ar and Air is a multi-step decomposition process, which may undergo PbSO4 → PbO·PbSO4 → 2PbO·PbSO4 → 4PbO·PbSO4 → PbO. PbO is not generated through direct decomposition of PbSO4. The results are expected to provide guidance for the lead wastes co-smelting process to achieve a target PbSO4 decomposition product.

中文翻译：

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铅废料回收过程中的 PbSO4 分解动力学和相变机制


PbSO4 是铅浆、铅烟和其他含铅固体废物的主要成分。它通常与初级铅精矿匹配，共熔炼以提取铅，主要在氧化冶炼阶段。铅废料从进料到反应完成，很快就会经历不同的温度和气氛场。本工作研究了铅废料火法冶金回收过程中 PbSO4 的分解动力学和相变机制。结果表明，在Ar气氛中，PbSO4在800 °C∼1000 °C分解反应的活化能为121.35 kJ/mol。PbSO4 在 Ar 和空气中的分解反应是一个多步分解过程，可能会发生 PbSO4 → PbO·PbSO4 → 2PbO·PbSO4 → 4PbO·硫酸铅4 → PbO。PbO 不是通过直接分解 PbSO4 生成的。研究结果有望为铅废料共熔炼工艺实现目标 PbSO4 分解产物提供指导。