A single-particle laminar-flow techniquewas used to study reactions of sulfidic nickel particles.The studied materials were three natural nickelconcentrates and four synthesised nickel mattes. Thevariables of the experiments were the gas preheatingtemperature (500-1300°C), the composition of thereaction gas (N2+0-75 vol-% O2) and the particle size ofthe feed. Chemical analysis of the particles was usedto determine the oxidation degree of the materials, andoptical and scanning electron microscopy were used todetect alteration in their morphology, internalcomposition and structure. General reactivity of thematerials was monitored by the extent of sulfur removal.The reaction mechanism of the studied materials wasfound to depend primarily on the materials compositionas well as oxygen content of the reaction gas.
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