Abstract
Abstract Cobalt is abundant only in some countries including Democratic Republic of the Congo. It would be necessary to secure over-seas Co ores and Co extraction technology. Two kinds of matte varying the sulfur content were manufactured by smelting reduc-tion of Co concentrate containing ~8 wt% Co, ~19 wt% Cu, and ~3 wt% Fe. The amount of Co, Cu and Fe was concentratedto 19~21 wt%, 39~41 wt%, and 7~9 wt% respectively in the resulting matte. High-pressure leaching of matte was performedin an autoclave with considering the effect of oxidizing agent, H 2 SO 4 concentration as a lixiviant, and the amount of sulfur addedto the matte. An oxidizing agent (oxygen) is necessary to improve Co leaching efficiency enabling usage of a dilute H 2 SO 4 leach-ing agent. An increase in H 2 SO 4 concentration prevents selective leaching of Co, and the sulfur content in matte has a minorinfluence on the Co leaching efficiency.Key words : cobalt, matte, autoclave, oxidizing agent, leaching · Received : June 5, 2015 · Revised : June 24, 2015 · Accepted : July 29, 2015Corresponding Author : Kyungjung Kwon (E-mail : kjkwon@sejong.ac.kr)Department of Energy & Mineral Resources Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 143-747, KoreaⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.
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