PbSO4 decomposition kinetic and phase transformation mechanism during lead waste recycling

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL Process Safety and Environmental Protection Pub Date : 2024-09-18 DOI:10.1016/j.psep.2024.09.074

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Abstract

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.

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铅废物回收过程中 PbSO4 的分解动力学和相变机制

PbSO4 是铅膏、铅烟和其他含铅固体废物的主要成分。它通常与原生铅精矿相匹配，共同熔炼提炼铅，主要是在氧化熔炼阶段。铅废料从进炉到反应结束，会迅速经历不同的温度场和气氛场。这项工作研究了铅废料火法冶炼回收过程中 PbSO4 的分解动力学和相变机理。结果表明，在 800 ℃∼1000 ℃ 的 Ar 大气中，PbSO4 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骤分解过程，可能经历 PbSO4 → PbO-PbSO4 → 2PbO-PbSO4 → 4PbO-PbSO4 → PbO。PbSO4 的直接分解不会产生 PbO。预计研究结果将为铅废物共熔工艺提供指导，以实现目标 PbSO4 分解产物。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.