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Process development for the direct solvent extraction of nickel and cobalt from nitrate solution:aluminum,cobalt,and nickel separation using Cyanex 272

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International Journal of Minerals,Metallurgy and Materials 2017年第1期24卷 37-46页

作者： zela t.ichlas Don C.lbana Leaching and Separation technologies Group Department of Mining Engineering and Metallurgical EngineeringWA School of MinesCurtin UniversityKalgoorlieWA 6430Australia

A direct solvent extraction（DSX） process for purifying nickel and cobalt from the nitric acid leach solution of nickel laterite ores was conceived and experimentally probed. the proposed process consists of two solvent extraction（SX） steps but with only one extractant - bis（2,4,4-trimethylpentyl）phosphinic acid（Cyanex？ 272） - used in both steps. the first extraction step involved the removal of aluminum and zinc, whereas the second extraction step involved the separation of cobalt along with manganese from nickel. the experimental results showed essentially quantitative removal of aluminum（〉97%） and zinc（〉99%） in a single extraction stage using 20vol% Cyanex 272 at pH 2.1. Some cobalt（32%） and manganese（55%） were co-extracted but were easily scrubbed out completely from the loaded organic phase using dilute sulfuric acid at pH ≤ 1.38. Cobalt and manganese in the first extraction raffinate were extracted completely in four extraction stages at staggered pH values of 4.0, 4.4, 4.5, and 4.0 in the first, second, third, and fourth stages, respectively, using also 20vol% Cyanex 272. A small amount of nickel（up to 6.6%） was co-extracted but was easily scrubbed out completely with dilute sulfuric acid at pH 2.0. A flow diagram showing the input and output conditions and the metals separated under the deduced optimum conditions is presented.

关键词： solvent extraction aluminum cobalt nickel nickel laterite ores

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Dissolution of lateritic nickel ore using ascorbic acid as synergistic reagent in sulphuric acid solution

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transactions of Nonferrous Metals Society of China 2018年第8期28卷 1652-1659页

作者： Sait KURSUNOGLU zela tanlega ichlas Muammer KAYA Department of Materials Science & nanotechnology Engineering Abdullah Gul University Kayseri 38100 Turkey Department of Metallurgical Engineering Faculty of Mining and petroleum Engineering Institut teknologi Bandung Bandung 40132 Indonesia Division of Mineral processing Department of Mining Engineering eskisehir Osmangazi University Eskisetfir 26480 Turkey

the dissolution of nickel and cobalt from Caldag lateritic nickel ore using the combination of sulphuric and ascorbic acids was investigated. the use of other organic acids, namely citric, maleic and stearic acids, as synergistic reagents was studied for comparison. the results revealed that the use of ascorbic and citric acids markedly improved the dissolution of cobalt compared to the other two organic acids that only showed slight synergistic effect on the leaching rate. In terms of nickel dissolution, ascorbic acid is the most effective synergist, followed by citric, maleic and stearic acids in descending order. Under the most optimized conditions found in this study, i.e., using 1 mol/L of sulphuric acid with the presence of 4 g/L of ascorbic acid at 80 ℃and solid-to-liquid ratio of 1/10, more than 99% and 98% leaching rates of cobalt and nickel, respectively, can be achieved within 4 h of leaching. In addition, the leaching performance is relatively insensitive to the change of ascorbic acid concentration from 2 to 4 g/L which is highly desirable from operational perspective.

关键词： laterite ore Caldag lateritic nickel ore synergistic reagent ascorbic acid nickel cobalt

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