Abstract The thermodynamic analysis and kinetics of the carbothermal reduction of aluminum sulfate using anthracite as the reducing agent are reported. The results showed that the reduction reaction was controlled by interfacial chemical reaction when the carbon excess coefficient was 1.15 (aluminum sulfate, anthracite coal particle size, respectively 100 mesh, 180 mesh) and the reaction temperature was in the range of 450–600 °C. The reaction could be represented using the Erofeev equation: and the apparent activation energy was 227.50 kJ·mol−1. From the XRD pattern, FTIR spectra and SEM image of the product after reduction was determined at 600 °C for 2 h, it was amorphous alumina and the particle size was small, which provided good conditions for the preparation of metallurgical grade alumina. Graphical Abstract

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硫酸铝碳热还原的热力学和动力学

摘要 报道了以无烟煤为还原剂的硫酸铝碳热还原的热力学分析和动力学分析。结果表明，当碳过量系数为1.15（硫酸铝、无烟煤粒度分别为100目、180目）、反应温度在450～600℃范围内时，还原反应受界面化学反应控制。 . 反应可以用Erofeev 方程表示： 表观活化能为227.50 kJ·mol-1。由XRD图谱、FTIR光谱和SEM图像确定600℃还原2h后产物为无定形氧化铝，粒径较小，为制备冶金级氧化铝提供了良好的条件。图形概要