Scholarlink

<p>To address the issues of high energy consumption, lengthy processes, and poor lead selectivity associated with the conventional method of pyrometallurgical pretreatment followed by plate anode electrolytic refining, this study proposes a novel one-step process, which utilizes a granular anode structure to enable direct purification of complex raw materials. Electrochemical techniques, including linear sweep voltammetry, galvanostatic polarization, and electrochemical impedance spectroscopy, were employed to investigate the passivation and impurity dissolution mechanisms of plate anodes. The results demonstrated that the granular structure increases the surface area, allows for independent control of the anode current density, and prevents passivation caused by high antimony content. Under optimal conditions, this process achieved a current efficiency of 98.91% and a specific energy consumption of 166.24&#xa0;kWh/t. The residual anode ratio was reduced to below 10.85%, representing a significant improvement compared to the conventional rate of 22–45%. The process produced cathode lead with 4N purity and effectively enriched the concentration of precious metals such as gold and silver in the anode slime. Therefore, the granular anode electrolysis technique successfully overcomes passivation challenges posed by high impurity content, providing essential theoretical and technical support for the short-route refining of secondary non-ferrous metal resources.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Selective Anodic Dissolution Enables a Simplified Electrolytic Route to 4N Lead Directly from High-Impurity Crude Lead

  • 期刊论文

  • 发表日期：

    2026年7月6日

查看全文
  • ShaSha He,
  • YaQi Song,
  • XiaoYong Huang,
  • GuoZheng Zha,
  • Xu Zhang,
  • Bin Yang,
  • Wenlong Jiang

摘要

To address the issues of high energy consumption, lengthy processes, and poor lead selectivity associated with the conventional method of pyrometallurgical pretreatment followed by plate anode electrolytic refining, this study proposes a novel one-step process, which utilizes a granular anode structure to enable direct purification of complex raw materials. Electrochemical techniques, including linear sweep voltammetry, galvanostatic polarization, and electrochemical impedance spectroscopy, were employed to investigate the passivation and impurity dissolution mechanisms of plate anodes. The results demonstrated that the granular structure increases the surface area, allows for independent control of the anode current density, and prevents passivation caused by high antimony content. Under optimal conditions, this process achieved a current efficiency of 98.91% and a specific energy consumption of 166.24 kWh/t. The residual anode ratio was reduced to below 10.85%, representing a significant improvement compared to the conventional rate of 22–45%. The process produced cathode lead with 4N purity and effectively enriched the concentration of precious metals such as gold and silver in the anode slime. Therefore, the granular anode electrolysis technique successfully overcomes passivation challenges posed by high impurity content, providing essential theoretical and technical support for the short-route refining of secondary non-ferrous metal resources.