{"title":"The Role of PbO2 in the Metal Lead Recovery from Lead Paste Via Suspension Electrolysis with Sulfuric Acid as Electrolyte","authors":"Zihan Su, Lixin Zhao, Sen Xie, Songyan Qin","doi":"10.1007/s40831-024-00796-4","DOIUrl":null,"url":null,"abstract":"<p>The suspension electrolysis system using sulfuric acid as the electrolyte (SE II system) provides a zero-emission strategy to recover high-purity lead from lead paste. It realized one-step lead recovery without desulfurization pre-treatment process. The dilemma of SE II system for lead past recovery is the difficulty of its main component poor conductive PbSO<sub>4</sub> reduction. PbSO<sub>4</sub> reduction with the help of PbO<sub>2</sub> is worthy to explore as PbO<sub>2</sub> is the second component and is good-conductive. In this study, through exploring the PbO<sub>2</sub> transformation process in SE II system, it is found that PbO<sub>2</sub> was firstly reduced to regular cubic structured newborn PbSO<sub>4</sub> crystals, and later to metal Pb with 94.12% purity. The PbO<sub>2</sub> and its reduction products were deposited and grown on the cathode plate to form an amorphous skeleton. The electrolysis experiment of lead paste in SE II system showed that the three-dimensional skeleton structure could wrap the raw PbSO<sub>4</sub> in the lead paste and then further reduce it to metal lead. The lead recovery rate was 86.26% with a purity of 97.45% Pb. The role of PbO<sub>2</sub> in the lead paste in the SE II system was deeply understood, which is helpful to enhance suspension electrolysis efficiency for the lead paste resource utilization in the future.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\n","PeriodicalId":17160,"journal":{"name":"Journal of Sustainable Metallurgy","volume":"77 1","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Sustainable Metallurgy","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s40831-024-00796-4","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY","Score":null,"Total":0}
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Abstract
The suspension electrolysis system using sulfuric acid as the electrolyte (SE II system) provides a zero-emission strategy to recover high-purity lead from lead paste. It realized one-step lead recovery without desulfurization pre-treatment process. The dilemma of SE II system for lead past recovery is the difficulty of its main component poor conductive PbSO4 reduction. PbSO4 reduction with the help of PbO2 is worthy to explore as PbO2 is the second component and is good-conductive. In this study, through exploring the PbO2 transformation process in SE II system, it is found that PbO2 was firstly reduced to regular cubic structured newborn PbSO4 crystals, and later to metal Pb with 94.12% purity. The PbO2 and its reduction products were deposited and grown on the cathode plate to form an amorphous skeleton. The electrolysis experiment of lead paste in SE II system showed that the three-dimensional skeleton structure could wrap the raw PbSO4 in the lead paste and then further reduce it to metal lead. The lead recovery rate was 86.26% with a purity of 97.45% Pb. The role of PbO2 in the lead paste in the SE II system was deeply understood, which is helpful to enhance suspension electrolysis efficiency for the lead paste resource utilization in the future.
以硫酸为电解质的悬浮电解系统（SE II 系统）为从铅膏中回收高纯度铅提供了一种零排放策略。它实现了一步法铅回收，无需脱硫预处理过程。SE II 系统在铅膏回收方面的难题在于其主要成分 PbSO4 的还原导电性较差。由于 PbO2 是第二组分且导电性好，因此借助 PbO2 还原 PbSO4 的方法值得探讨。本研究通过探索 PbO2 在 SE II 体系中的转化过程，发现 PbO2 首先被还原成规则立方结构的新生 PbSO4 晶体，随后被还原成纯度为 94.12% 的金属铅。PbO2 及其还原产物在阴极板上沉积生长，形成无定形骨架。铅膏在 SE II 系统中的电解实验表明，三维骨架结构可将原 PbSO4 包裹在铅膏中，然后进一步还原成金属铅。铅的回收率为 86.26%，铅的纯度为 97.45%。深入了解了铅膏中的 PbO2 在 SE II 系统中的作用，有助于提高悬浮电解效率，促进铅膏资源化利用。
期刊介绍：
Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.
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