Over 150 million tons of high-alkaline bauxite residue was produced during the Bayer process of Bauxite smelting in the world annually, causing massive encroachment and irreversible pollution of soil. In this work, we proposed a new way out of bauxite residue, synthesizing a micro-electrolysis composite material (MECM) by carbothermal reduction of the bauxite residue towards the degradation of high-concentration organic wastewater. Batch experiments of organic compounds degradation were conducted to evaluate the performance of MECM with or without synergistic Fenton process. XRD and SEM-EDS analysis results indicated that a proper calcination temperature (1000℃) could facilitate the generation and growth of zero-valent iron (ZVI), thereby forming a large number of galvanic cells with carbon, which could efficiently break the azo bonds. Additionally, the micro-electrolysis reaction of MECM could provide lots of Fe(Ⅱ), which constituted the Fenton system with the additional H₂O₂. In Fenton system, the aromatic rings and alkyl chains were further degraded and mineralized, which reduced the chemical oxygen demand (COD) of methyl orange (MO) from 450 to 54 mg/L. Therefore, the combination of the micro-electrolysis and Fenton process provides a clean and efficient method for the treatment of organic wastewater, which is a promising way out for bauxite residue.

全世界每年在铝土矿的拜耳法冶炼的拜耳法过程中，产生了超过1.5亿吨的高碱性铝土矿残渣，造成了巨大的侵蚀和不可逆转的土壤污染。在这项工作中，我们提出了一种从铝土矿残渣中脱除的新方法，该方法是通过铝土矿残渣的碳热还原以降解高浓度有机废水来合成微电解复合材料（MECM）。进行有机化合物降解的分批实验，以评估具有或不具有协同Fenton工艺的MECM的性能。XRD和SEM-EDS分析结果表明，适当的煅烧温度（1000℃）可以促进零价铁（ZVI）的生成和生长，从而形成大量含碳的原电池，可以有效地破坏偶氮键。 。₂ O ₂。在芬顿体系中，芳环和烷基链进一步降解并矿化，从而使甲基橙（MO）的化学需氧量（COD）从450降低至54 mg / L。因此，微电解与Fenton工艺的结合提供了一种清洁高效的有机废水处理方法，这是铝土矿残留物的有前途的出路。