An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining

Xuan Zhang; Junqing Pan; Yanzhi Sun; Yongjun Feng; Huixia Niu

doi:10.1016/j.cjche.2018.09.005

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An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining

Energy, Resources and Environmental Technology | Updated：2026-01-06

- An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining
- Chinese Journal of Chemical Engineering Vol. 27, Issue 5, Pages: 1191-1199(2019)
- Affiliations：
  
  State Key Laboratory of Chemical Resource Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology,Beijing,China,100029
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2018.09.005
  CLC：
- Published：2019
- Accepted：
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Xuan Zhang, Junqing Pan, Yanzhi Sun, Yongjun Feng, Huixia Niu. An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining[J]. Chinese Journal of Chemical Engineering, 2019, 27(5): 1191-1199.
DOI：

Xuan Zhang, Junqing Pan, Yanzhi Sun, Yongjun Feng, Huixia Niu. An energy saving and fluorine-free electrorefining process for ultrahigh purity lead refining[J]. Chinese Journal of Chemical Engineering, 2019, 27(5): 1191-1199. DOI： 10.1016/j.cjche.2018.09.005.

摘要

Abstract

The present paper reports a new fluoride-free and energy-saving lead electrolytic refining process in order to solve the serious problems of the existing Betts lead electrorefining process

such as low production efficiency

high energy consumption and fluorine pollution. In the process

a mixed solution of perchloric acid and lead perchlorate (HClO

-Pb(ClO

)

) with the additives of gelatin and sodium lignin sulfonate is employed as the new electrolyte. The cathodic polarization curves show that HClO

is very stable

and there is no any reduction reaction of HClO

during the electrolytic process. The redox reactions of lead ions in HClO

solution are very reversible with an ultrahigh capacity efficiency

so the HClO

acts as a stable support electrolyte with higher ionic conductivity than the traditional H

SiF

electrolyte. The results of the scale-up experiments show that under the optimal conditions of 2.8 mol·L

-1

HClO

0.4 mol·L

-1

Pb(ClO

)

and electrolysis temperature of 45℃

the energy consumption is as low as 24.5

kW·h·(t Pb)

-1

only about 20% of that by Betts method at the same current density of 20 mA·cm

-2

and the purity of the refined lead is up to 99.9992%

much higher than that specified by Chinese national standard (99.994%

GB/T 469-2013) and European standard (99.99%

EN 12659-1999).

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