A novel process for cobalt and copper recovery from cobalt white alloy with high silicon

Author:

Ren Guoxing,Liu Zhihong,Pan Bing,Xiao Songwen

Abstract

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.

Funder

National Natural Science Foundation of China

Publisher

EDP Sciences

Subject

Materials Chemistry,Metals and Alloys,Mechanics of Materials,Computational Mechanics

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