Abstract Large amounts of industrial waste discharge have serious implications for the environment. The production of coarse Al-Si alloy by carbothermal reduction is considered to be one potential method for making use of industrial aluminiferous waste slag. Here, we discuss the influence of different processing parameters on electrolytic refining of aluminum alloy and investigate the mechanism of extracting Al from coarse Al-Si alloy in a low-temperature molten salt system. Aluminum is obtained with the use of coarse Al-Si alloy as a soluble anode in the AlCl3-NaCl-KCl molten salt system. The current efficiency reached over 94% when the electrolysis temperature was 170 ℃, the current density was 30 mA/cm2 and electrolysis was performed for 1.5 h. In the electrolysis process, Al in the coarse Al-Si alloy was present in the form of Al2Cl7− and AlCl4−, which precipitated at the cathode. The purity of aluminum electrodeposited on the aluminum cathode was 99.3%.

中文翻译：

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低温熔盐电解从废铝合金中回收铝

摘要 大量工业废弃物排放对环境造成严重影响。通过碳热还原生产粗铝硅合金被认为是利用工业含铝废渣的一种潜在方法。在这里，我们讨论了不同工艺参数对铝合金电解精炼的影响，并研究了在低温熔盐系统中从粗铝硅合金中提取铝的机制。铝是在 AlCl3-NaCl-KCl 熔盐系统中使用粗铝硅合金作为可溶性阳极获得的。当电解温度为170 ℃，电流密度为30 mA/cm2，电解1.5 h时，电流效率达到94%以上。在电解过程中，粗铝硅合金中的铝以 Al2Cl7- 和 AlCl4- 的形式存在，它们在阴极沉淀。电解沉积在铝阴极上的铝纯度为99.3%。