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• W2068985004 abstract "The oxidation mechanism of nickel concentrate from ambient up to 1000 °C was investigated by thermogravimetric (TG) and differential thermal analysis (DTA) to improve the understanding of the oxidation behavior of the nickel concentrate during industrial roasting. The reaction products at intermediate temperatures were analyzed by X-ray powder diffraction (XRD), SEM/EDS, electron probe micro-analysis (EPMA), and chemical analysis. A reaction scheme was deduced, in which the preferential oxidation of iron sulfide species took place in the temperature range of 350–700 °C, forming Ni1−xS and Fe2O3. Subsequently, the resulting Ni1−xS was transformed into Ni3±xS2. Ni3±xS2 core melted at 813 °C and accelerated its oxidation forming NiO and NiSO4. At 942 °C, NiSO4 decomposed and the complete oxidation of the remaining nickel sulfide took place due to the absence of the protective sulfate shell. The kinetic results indicate that the diffusion of O2 through the sample bed controls the reaction rate if the bed depth is larger than approximately 125 μm." @default.
• W2068985004 created "2016-06-24" @default.
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• W2068985004 date "2012-04-01" @default.
• W2068985004 modified "2023-09-23" @default.
• W2068985004 title "TG/DTA study on the oxidation of nickel concentrate" @default.
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• W2068985004 doi "https://doi.org/10.1016/j.tca.2012.01.017" @default.
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