Metall. Res. Technol.
Volume 117, Number 4, 2020
|Number of page(s)||7|
|Published online||06 July 2020|
A novel process for cobalt and copper recovery from cobalt white alloy with high silicon
School of Metallurgy and Environment, Central South University,
410083, PR China
2 Changsha Research Institute of Mining & Metallurgy CO., Ltd., Changsha 410012, PR China
Accepted: 11 June 2020
The cobalt white alloy, an intermediate product of cobalt smelting, is difficult to leach at atmosphere due to its corrosion-resistant structure. The current study proposed a novel process to extract Co and Cu from the cobalt white alloy with high silicon content. The process mainly involves three steps: desilication of the alloy melt through oxidation smelting using MnO-MgO-SiO2 slag, powder making of the desilication alloy melt by water atomization and atmospheric sulfuric acid leaching of the alloy powders. The results showed that 83.64% of Si in the white alloy was removed effectively by oxidizing it preferentially into the MnO-MgO-SiO2 slag. 97.99% of cobalt and 97.78% of copper were leached under optimal conditions according to: temperature of 95 °C, liquid/solid ratio of 10/1, excess of sulfuric acid of 1.3 times the stoichiometric demand, stirring rate of 1500 rpm, leaching time of 8.0 hours, and oxygen gas flow rate of 0.15 L/min. The overall recovery in this process attained 93.41% for cobalt and 94.33% for copper, separately.
Key words: cobalt white alloy / desilication / MnO-MgO-SiO2 slag system / water-atomized alloy powders / atmospheric sulfuric acid leaching
© EDP Sciences, 2020
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.