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Preparation of zeolite NaA for CO_2 capture from nickel laterite residue

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 820-825页

作者： Tao Du Li-ying Liu Penny Xiao Shuai Che He-ming Wang School of Material and Metallurgy Northeastern University Department of Chemical and Biomolecular Engineering The University of Melbourne

Zeolite NaA was successfully prepared from nickel laterite residue for the first time via a fusion-hydrothermal procedure. The structure and morphology of the as-synthesized zeolite NaA were characterized with a range of experimental techniques, such as X-ray diffraction, scanning electronic microscopy, and infrared spectroscopy. It was revealed that the structures of the produced zeolites were dependent on the molar ratios of the reactants and hydrothermal reaction conditions, so the synthesis conditions were optimized to obtain pure zeolite NaA. Adsorption of nitrogen and carbon dioxide on the prepared zeolite NaA was also measured and analyzed. The results showed that zeolite NaA could be prepared with reasonable purity, it had physicochemical properties comparable with zeolite NaA made from other methods, and it had excellent gas adsorption properties, thus demonstrating that zeolite NaA could be prepared from nickel laterite residue.

关键词： zeolites nickel laterite residue synthesis structural properties carbon dioxide adsorption

Preparation of ferronickel from nickel laterite via coal-based reduction followed by magnetic separation

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International Journal of Minerals,Metallurgy and Materials 2018年第7期25卷 744-751页

作者： lun-wei wang xue-ming lü mei liu zhi-xiong you xue-wei lü chen-guang bai college of materials science and engineering chongqing universityChongqing 400044China engineer of cisdi thermal&environmental engineering co. ltd.Chongqing 401122China

The sticking phenomenon between molten slag and refractory is one of the crucial problems when preparing ferronickel from laterite ore using rotary hearth fulnace or rotary kiln processes. This study aims to ameliorate sticking problems by using silicon dioxide （SiO2） to adjust the melting degree of file briquette during reduction roasting. Thermodynamic analysis indicates that the melting temperature of the slag gradually increases with an increase in the SiO2 proportion （SiO2/（SiO2 ＋ A1203 ＋ MgO） mass ratio）. Experimental validations also prove that the briquette retains its original shape when the SiO2 proportion is greater than 75wt%, and sticking problems axe avoided during reduction. A ferronickel product with 8.33wt% Ni and 84.71wt% Fe was prepared via reductive roasting at 1500~C for 90 min with a SiO2 proportion of 75wt% and a C/O molar ratio of 1.0 followed by dry magnetic separation; the corresponding recoveries of Ni and Fe reached 75.70% and 77.97%, respectively. The micro stxucture and phase txmlsformation of reduced briquette reveals that the aggregation and growth of ferroinckel particles were not significantly affected after adding SiO2 to the reduction process.

关键词： nickel laterite caxbot^ermal reduction ferronickel magnetic separation

Computer modeling of high-pressure leaching process of nickel laterite by design of experiments and neural networks

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International Journal of Minerals,Metallurgy and Materials 2012年第7期19卷 584-594页

作者： Milovan Milivojevic Srecko Stopic Bernd Friedrich Boban Stojanovic Dragoljub Drndarevic Technical and Business College IME Process Metallurgy and Metal Recycling RWTH Aachen University Department of Mathematics and Informatics Faculty of Science University of Kragujevac

Due to the complex chemical composition of nickel ores, the requests for the decrease of production costs, and the increase of nickel extraction in the existing depletion of high-grade sulfide ores around the world, computer modeling of nickel ore leaching process be- came a need and a challenge. In this paper, the design of experiments （DOE） theory was used to determine the optimal experimental design plan matrix based on the D optimality criterion. In the high-pressure sulfuric acid leaching （HPSAL） process for nickel laterite in ＂Rudjinci＂ ore in Serbia, the temperature, the sulfuric acid to ore ratio, the stirring speed, and the leaching time as the predictor variables, and the degree of nickel extraction as the response have been considered. To model the process, the multiple linear regression （MLR） and response surface method （RSM）, together with the two-level and four-factor full factorial central composite design （CCD） plan, were used. The proposed re- gression models have not been proven adequate. Therefore, the artificial neural network （ANN） approach with the same experimental plan was used in order to reduce operational costs, give a better modeling accuracy, and provide a more successful process optimization. The model is based on the multi-layer neural networks with the back-propagation （BP） learning algorithm and the bipolar sigmoid activation function.

关键词： nickel laterite leaching computer simulation design of experiments （DOE） response surface method （RSM） neural networks

Application of response surface methodology in optimizaing thesulfation-roasting-leaching process of nickel laterite

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International Journal of Minerals,Metallurgy and Materials 2012年第3期19卷 199-204页

作者： Xue-yi Guo Dong Li Zhan Wu Qing-hua Tian School of Metallurgical Science and Engineering Central South UniversityChangsha 410083China

nickel was recovered from nickel laterite using a sulfation-roasting-leaching process and the effects of operation parameters in- cluding acid addition, roasting temperature, and roasting time on nickel extraction and iron dissolution were investigated using response sur- face methodology （RSM）. Two second-order polynomial models of high significance were presented to show the relationship between the responses and the variables. The analysis of variance （ANOVA） showed high coefficients of determination （R2） of 0.894 and 0.980 for the two models, respectively. Optimum areas of 〉-80% Ni extraction and 〈5% Fe dissolution were obtained by the overlaid contours. Verification experiments in the optimum areas were conducted and the results indicate a close agreement with the predicted values obtained from the models.

关键词： nickel laterite sulfation roasting leaching optimization response surface methodology

A new route of ferric ions rejection in a synthetic nickel leach solution

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International Journal of Minerals,Metallurgy and Materials 2010年第3期17卷 257-261页

作者： Hai-peng Wang Jing Zhao Wen Liang Yuan Mei Babak Houdeh Yuan Tian WA School of Mines ＆ AJ Parker Centre Curtin University of Technology Kalgoorlie WA 6430 Australia Faculty of Science ＆ Engineering East China University of Science and Technology Shanghai 200237 China Department of Mining Engineering The University of Tehran Tehran *** Iran School of Chemical Engineering The University of Adelaide Adelaide SA 5005 Australia

A new route of impurity rejection to remove ferric iron from a synthetic nickel leach solution was introduced, which simulated the chemical composition of a typical acid leach solution of nickel laterites under atmospheric pressure. The synthetic solution underwent a stepwise neutralization process, with each step adopting different pH value-temperature combinations. In a conventional nickel atmospheric leach （AL） process, the nickel loss could be as high as 10wt%, which was a longstanding issue and prevented this process from commercialization. The new impurity rejection route is the first step towards resolving this issue. The results show that, the best neutralization performance is achieved at the nickel loss of 3.4wt% in the neutralization scheme that employs ethylenediaminetetraacetic acid as a nickel stabilizer （pH： 1.3-3.5; temperature： 95-70℃）

关键词： nickel laterite acid leach iron removal impurity rejection neutralization