Details

Autor(en) / Beteiligte

• Zhang, Yonglu
• Yao, Zhichao
• Jie, Xiaowu
• Ma, Baozhong
• Wang, Chengyan
• Chen, Yongqiang

Titel

Anodic Process of Stibnite in Slurry Electrolysis: Indirect Electro-Oxidation

Ist Teil von

• JOM (1989), 2023-05, Vol.75 (5), p.1551-1558

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The application of slurry electrolysis for high-arsenic antimony–gold concentrate treatment provides several benefits, including a short treatment process, complete separation of antimony and gold, and low environmental impact. A key process in slurry electrolysis is the anodic reaction. In this study, pure stibnite was used as raw material and linear sweep voltammetry was adopted to investigate the anodic process with the introduction of the Fe(III)/Fe(II) redox couple. The results indicated that the anodic polarization curve comprised three distinct regions: a low potential region (0.47–0.65 V), where the reaction rate was controlled by the electrochemical reaction; a medium potential region (0.65–0.90 V), where the electrochemical reaction was accelerated with an increase in overpotential, and the diffusion of Fe(II) gradually became the rate-controlling step; and a high potential region, where the reaction reached a stable state in which Fe(II) diffusion controlled the rate, and the polarization current density changed minimally with an increase in potential. The effects of particle size, liquid–solid ratio, stirring speed, temperature, and iron ion concentration were also investigated. The introduction of Fe(III)/Fe(II) considerably improved the oxidative leaching rate and significantly reduced the power consumption of electrolysis, offering the possibility of using slurry electrolysis in industrial applications.