Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System
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- 影响因子：9.224
- DOI码：10.1021/acssuschemeng.2c02922
- 发表刊物：ACS Sustaina ble Chemistry & Engineering
- 关键字：lead, electrorefining, methanesulfonic acid, additive, reversible redox reaction, electrochemical behavior, deposition morphology, distribution behavior
- 摘要：The conventional electrorefining process of crude lead (Pb) employing a bone glue (BG)- and calcium lignosulfonate (CL)-synergistically assisted fluosilicic acid (H2SiF6) system suffers the
undesired environment burden caused by the high saturated vapor pressure and low stability of H2SiF6. Herein, we propose an additiveassisted methanesulfonic acid (MSA) system for green and efficient electrorefining of crude Pb based on the low volatility and high stability of MSA. Combinations of MSA with additives are evaluated and screened using photographic images, SEM observations, XRD, white light interference, etc. The electrochemical analysis of cyclic voltammetry and chronoamperometry elucidates the Pb deposition behavior in the Lugalvan BNO12-assisted MSA system, in which a three-dimensional nucleation model is applicable. Using MSA as the
solvent and β-naphthol ethoxylate (Lugalvan BNO12) as the assisted additive, the bench-scale operation of crude Pb electrorefining experimentally achieves an electric energy requirement (W) of 87kWhe/t Pb and a cathodic current efficiency (η) of 99.6%. This is very competitive with the W of 120 kWhe/t Pb and η of 95.0% for the BG-CL-assisted H2SiF6 system. Also, the bench-scale operation obtains a plat and dense deposit sample with a Pb purity of>99.99%. The distribution behavior of elements shows that most of the Pb element is recovered in the form of the cathodic Pb, elements Sn, Zn, and Fe mainly accumulate in the electrolyte, and elements As, Sb, Bi, Ag, and Cu remain in the anode slime. This work opens new directions for more technically and economically feasible Pb electrorefining.
- 论文类型：期刊论文
- 学科门类：工学
- 一级学科：冶金工程
- 文献类型：J
- 卷号：10
- 页面范围：11223-11231
- 是否译文：否
- 发表时间：2022-08-15
- 收录刊物：SCI
