Abstract Bauxite residue (red mud) is a promising anthropogenic source of scandium because only at the aluminum plants of Ural region (Russia) nearly 150 tons of this trace metal appears in the waste dumps annually. This work describes a method of red mud carbonization by carbon dioxide that results on the one hand to scandium leaching and on the other hand decrease of toxicity of the red mud due to conversion of hydroxides to carbonates and decrease of pH value from 12 to less than 9. The ways of increase of scandium leaching degrees based on ultrasonic treatment and mechanical activation were evaluated. It was supposed that carbonated red mud had high sorption activity being the main cause of secondary loss of scandium in the carbonate treatment process.

中文翻译：

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赤泥（铝土矿渣）中碳酸盐钪的强化浸出

摘要 铝土矿残渣（赤泥）是一种很有前景的人为钪来源，因为仅在乌拉尔地区（俄罗斯）的铝厂，每年有近 150 吨这种微量金属出现在垃圾场中。这项工作描述了一种通过二氧化碳碳化赤泥的方法，一方面导致钪浸出，另一方面由于氢氧化物转化为碳酸盐和 pH 值从 12 降低到小于9.评价了基于超声处理和机械活化提高钪浸出度的方法。推测碳酸化赤泥吸附活性高是碳酸盐处理过程中钪二次流失的主要原因。