Abstract Aluminium-chromium slag is a by-product of the thermal reduction of aluminium during chromium smelting, which is generally considered solid waste with a low utilisation rate. In this work, a fused carbonisation reduction method has been proposed to separate the Al 2 O 3 and Cr 2 O 3 from the slag and produce fused alumina and chromium carbide materials for refractory applications. The thermodynamic parameters of this process were determined using a standard thermal analysis method. In the molten slag, Cr 2 O 3 reacts with C to produce high-density chromium carbide, which effectively precipitates at the bottom of the reaction vessel, while Al 2 O 3 is converted into the corundum phase during cooling. The results of chemical analysis showed that the Al 2 O 3 content in fused alumina was greater than 95 wt%, while its main crystalline phase was the corundum with a bulk density of 3.57 g cm −3 , thermal conductivity of 6.4–7.4 W m −1 K −1 (at temperatures above 600 °C), and average thermal expansion coefficient of about 7.5–8.2 × 10 −6 /°C (in the temperature range of 800–1300 °C).

中文翻译：

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铝铬渣制备电熔氧化铝的分离与表征

摘要 铝铬渣是铝在铬冶炼过程中热还原的副产物，一般被认为是利用率低的固体废物。在这项工作中，已经提出了一种熔融碳化还原方法来从炉渣中分离 Al 2 O 3 和 Cr 2 O 3 并生产用于耐火材料的熔融氧化铝和碳化铬材料。该过程的热力学参数使用标准热分析方法确定。在熔渣中，Cr 2 O 3 与C反应生成高密度碳化铬，有效地沉淀在反应器底部，而Al 2 O 3 在冷却过程中转化为刚玉相。化学分析结果表明，电熔氧化铝中Al 2 O 3 含量大于95wt%，