Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7044023 | Separation and Purification Technology | 2018 | 43 Pages |
Abstract
Molten salt electrolysis was utilized for the separation of cobalt and tungsten from cemented carbide scrap in the NaCl-KCl melt at 1023â¯K (750â¯Â°C). The WC-15 Co sacrificial anode was dissolved to cobalt and tungsten ions and consequently discharged on the cathode to deposit cobalt and tungsten during electrolysis. The carbon remained at the anode with a porous structure. The oxidation potential of the cobalt and the tungsten carbide in the cemented carbide were analyzed through the electrochemical method. The effects of anode potential, current and duration on the dissolution were investigated. The anodic dissolution processes under different conditions were characterized through SEM and EDX. Subsequently to the two-step electrolysis, the cobalt powders of 100â¯nm in diameter, the tungsten powders of below 200â¯nm in diameter and a porous structure of carbon were obtained.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
A. Liwen Zhang, B. Zuoren Nie, C. Xiaoli Xi, D. Liwen Ma,