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Microwave assisted atmospheric acid leaching of nickel from laterite ore

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Rare Metals 2010年第3期29卷 327-332页

作者： CHE Xiaokui SU Xiuzhu CHI Ru'an YU Junxia College of Resources and Civil Engineering Northeastern University Shenyang 110004 China Division of Mineral Resources Metallurgy & Materials General Research Institute for Nonferrous Metals Beijing 100088 China Key Laboratory for Green Chemical Process of the Ministry of Education of China & Hubei Key Lab of Novel Reactor & Green Chemical Technology Wuhan Institute of Technology Wuhan 430073 China

The recovery of nickel from laterite ore with sulphuric acid under the effect of microwave irradiation was *** experimental results indicated that the extraction rate of nickel was influenced by reaction time,sulphuric acid concentration,and temperature,especially by microwave *** results obtained from the experiments of orthogonal arrays showed that the optimum conditions of sulphuric acid concentration,reaction time,microwave power,and temperature were 25 vol.%,1.5 h,600 W,and 90°C,*** the optimal conditions,the nickel recovery could reach approximately 90.8%,which was higher than that obtained by conventional water bath *** experiments showed that the leaching of nickel in a sulphuric acid medium was controlled by chemical reaction occurring on the surface of laterite *** apparent activation energy was 38.9 kJ/*** heating technology is efficient,clean,and easy to control and facilitate continuous processing of materials.

关键词： microwave sulphuric acid-leaching laterite ore nickel

Thermodynamic of selective reduction of laterite ore by reducing gases

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 3133-3138页

作者：陈松郭曙强姜兰徐玉棱丁伟中材料科学与工程学院上海200072

As the sulfide ore deposits become less economical and environmental viable as a source of nickel,increasing attention is being paid to the laterite *** in the pyrometallurgical process of laterite,more efforts should be paid to control the reduction of iron oxide in order to get high nickel-content nickeliferous *** these reasons,equilibrium condition of iron oxide when laterite ore was selectively reduced by CO2/CO,H2O/H2 and CO2/H2 was studied from the perspective of iron activity with an assumption that the activities of Fe O and Fe3O4 equal 1 in this work,and it well accounts for the inescapability of Fe *** coefficient of iron in Ni-Fe binary solid alloy was calculated by Miedema model based on the known thermodynamics datum *** to Raoult＇s law,the relationship among the Fe/Ni ratio,reduction temperature and reduction gas composition was calculated when laterite ore was selectively reduced by the three different reduction *** calculation result was discussed and also compared with the experimental *** trend of metal iron content in the reduction product of laterite ore varying with temperature and gas composition was well predicted by the calculation result.

关键词： selective reduction laterite ore activity coefficient Miedema model

Feasibility of co-reduction roasting of a saprolitic laterite ore and waste red mud

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International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 591-597页

作者： Xiao-ping Wang Ti-chang Sun Jue Kou Zhao-chun Li Yu Tian School of Civil and Resource Engineering University of Science and Technology Beijing

Large scale utilization is still an urgent problem for waste red mud with a high content of alkaline metal component in the *** ores especially the saprolitic laterite ore are one refractory nickel resource,the nickel and iron of which can be effectively recovered by direct reduction and magnetic *** metal salts were usually added to enhance reduction of laterite *** feasibility of co-reduction roasting of a saprolitic laterite ore and red mud was *** show that the red mud addition promoted the reduction of the saprolitic laterite ore and the iron ores in the red mud were co-reduced and *** adding 35wt%red mud,the nickel grade and recovery were 4.90wt%and 95.25wt%,and the corresponding iron grade and total recovery were 71.00wt%and 93.77wt%,*** X-ray diffraction（XRD）,scanning electron microscopy,and energy dispersive spectroscopy（SEM-EDS）analysis results revealed that red mud addition was helpful to increase the liquid phase and ferronickel grain *** chemical compositions＂Ca O and Na_2O＂in the red mud replaced Fe O to react with Si O_2 and Mg Si O_3 to form augite.

关键词： laterite ore red mud reduction roasting phase transformation

Reinforcement of the two-stage leaching of laterite ores using surfactants

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Frontiers of Chemical Science and Engineering 2021年第3期15卷 562-570页

作者： Peiyu Zhang Hairui Wang Jingcheng Hao Jiwei Cui School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100China Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education Shandong UniversityJinan 250100China Shandong Environmental Protection Industry Group Co.Ltd. Jinan 250000China

A two-stage leaching process,namely,highpressure acid leaching-atmospheric acid leaching,was used to treat laterite ores under mild *** leaching ratio of Ni was low because of adsorption and incomplete *** this work,surfactants were used as additives to boost the leaching ratio of *** effect of surfactant type(cationic,anionic,and nonionic surfactants)on the leaching ratio of Ni was *** results showed that stearyl trimethyl ammonium chloride(STAC)apparently increased the leaching ratios of valuable *** variation in the physicochemical properties of the lixiviant and the residue improved the leaching ratio of Ni in the presence of *** analysis indicated that the leaching process was controlled by chemical reaction.

关键词： laterite ore Ni surfactant acid leaching

Dechromization and dealumination kinetics in process of Na_2CO_3-roasting pretreatment of laterite ores

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Transactions of Nonferrous Metals Society of China 2014年第12期24卷 3979-3986页

作者：郭强曲景奎韩冰冰魏广叶张培育齐涛湿法冶金清洁生产技术国家工程实验室北京100190 中国科学院过程工程研究所绿色过程与工程院重点实验室北京100190

A novel process was proposed for the activation pretreatment of limonitic laterite ores by Na2CO3 roasting. Dechromization and dealumination kinetics of the laterite ores and the effect of particle size, Na2CO3-ore mass ratio, and roasting temperature on Cr and Al extraction were studied. Experimental results indicate that the extraction rates of Cr and Al are up to 99%and 82%, respectively, under the optimal particle size of 44–74μm, Na2CO3-to-ore mass ratio of 0.6：1, and temperature of 1000 ℃. Dechromization within the range of 600–800 oC is controlled by the diffusion through the product layer with an apparent activation energy of 3.9 kJ/mol, and that it is controlled by the chemical reaction at the surface within the range of 900–1100 ℃ with an apparent activation energy of 54.3 kJ/mol. Besides, the Avrami diffusion controlled model with on apparent activation energy of 16.4 kJ/mol is most applicable for dealumination. Furthermore, 96.8%Ni and 95.6%Co could be extracted from the alkali-roasting residues in the subsequent pressure acid leaching process.

关键词： dechromization dealumination kinetics Na2CO3-roasting pretreatment laterite ore nickel cobalt

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