Selective reductive leaching of oxidised cobalt containing residue |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Jiangxi Yunwei New Material Company Limited, Yichun 336000, China;3. School of Metallurgy and Environment, Central South University, Changsha 410083, China;1. Programa de Pós-graduação em Engenharia Metalúrgica, Materiais e de Minas, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Campus da Pampulha, 30160-030 Belo Horizonte, MG, Brazil;2. Laboratório de Modelagem Molecular, Centro de Tecnologia Mineral (CETEM), Av. Pedro Calmon, 900, Cidade Universitária, 21941-908 Rio de Janeiro, RJ, Brazil;3. Programa de Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro (UFRJ), Av. Horácio Macedo, 2030, Centro de Tecnologia, Cidade Universitária, 21941-598 Rio de Janeiro, RJ, Brazil;1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China;2. School of Metallurgy, Northeastern University, Shenyang 110819, China;3. CNMC Luanshya Copper Mines Plc (CLM), Independence Avenue, Luanshya City, 90456, Zambia |
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| Abstract: | Nickel was selectively leached from an industrial nickel-cobalt Mixed Hydroxide Precipitate (MHP) under mildly acidic, strongly oxidizing conditions. The resulting cobalt rich residues contained 14-21 wt.% Ni, 3-7 wt.% Co and 3-9 wt.% Mn. The selective extraction of nickel and cobalt from these residues was studied using weak acid and weak acid-reductive leaching. Without the reducing agent, nickel preferentially leached. The controlled addition of a reducing agent increased the extent of nickel leaching and solubilised a portion of the cobalt while manganese remained stable in the solid phase. The extent of copper, iron and aluminium leaching was controlled by pH adjustment. |
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| Keywords: | Leaching Hydrometallurgy Extractive metallurgy Non-ferrous metallic ores Nickel Cobalt |
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