One-step electrochemical reduction of stibnite concentrate in molten borax
来源期刊：International Journal of Minerals Metallurgy and Materials2019年第10期
论文作者：Levent Kartal Mehmet Bar?? Daryal Güldem Kartal ?ireli Servet Timur
文章页码：1258 - 1265
摘 要：In this study, antimony production from a stibnite concentrate（Sb2S3） was performed in one step using a molten salt electrolysis method and borax as an electrolyte. Electrochemical reduction of the stibnite concentrate was performed at 800℃ under galvanostatic conditions and explained in detail by the reactions and intermediate compounds formed in the borax. The effects of current density(100-800 mA·cm-2) and electrolysis time（10-40 min） on cathodic current efficiency and antimony yields were systematically investigated. During the highest current efficiency, which was obtained at 600 m A·cm-2, direct metal production was possible with 62% cathodic current efficiency and approximately 6 kWh/kg energy consumption. At the end of the 40-min electrolysis duration at 600 mA·cm-2 current density, antimony reduction reached 30.7 g and 99% of the antimony fed to the cell was obtained as metal.
Levent Kartal1，Mehmet Bar?? Daryal2，Güldem Kartal ?ireli2，Servet Timur2
1. Department of Metallurgical and Materials Engineering, Hitit University2. Department of Metallurgical and Materials Engineering, Istanbul Technical University
摘 要：In this study, antimony production from a stibnite concentrate（Sb2S3） was performed in one step using a molten salt electrolysis method and borax as an electrolyte. Electrochemical reduction of the stibnite concentrate was performed at 800℃ under galvanostatic conditions and explained in detail by the reactions and intermediate compounds formed in the borax. The effects of current density(100-800 mA·cm-2) and electrolysis time（10-40 min） on cathodic current efficiency and antimony yields were systematically investigated. During the highest current efficiency, which was obtained at 600 m A·cm-2, direct metal production was possible with 62% cathodic current efficiency and approximately 6 kWh/kg energy consumption. At the end of the 40-min electrolysis duration at 600 mA·cm-2 current density, antimony reduction reached 30.7 g and 99% of the antimony fed to the cell was obtained as metal.
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