Abstract Due to the fact that the presence of aluminum in the leaching solutions of the ionic rare-earth ore adversely affects the subsequent extraction and separation of the REES (rare-earth elements), the aluminum must be reduced as soon as possible. Previously, organic substances with functional groups of carboxyl, hydroxyl, and amino, which can form stable and insoluble water complexes with aluminum ions in aqueous solutions under certain conditions, have been studied. This study used 8-hydroxyquinoline as the selective complexing precipitant for the purpose of complexing and precipitating aluminum in a rare-earth leaching solution. The results revealed that, when the amount of 8-hydroxyquinoline was 1.25 times that of the theoretical reaction amount; the reaction time was ten minutes; reaction temperature was 60 °C; and final pH of the solution was 4.5, then the Al3+ removal reached 94.39%, and the RE3+ loss was only 8.21%. Additionally, the obtained 8-hydroxyquinoline aluminum was found to have the advantages of a rapid precipitation rate, large crystal particles, and small entrainment losses, and filtration had been easily completed. In addition, the characteristics of the obtained 8-hydroxyquinoline aluminum would allow it to be used as photoelectric material with a high market value.

中文翻译：

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通过络合沉淀法从稀土浸出液中去除铝

摘要 由于离子型稀土矿浸出液中铝的存在对后续REES（稀土元素）的提取分离产生不利影响，因此必须尽快减少铝。以前曾研究过具有羧基、羟基、氨基等官能团的有机物质，在一定条件下，能与水溶液中的铝离子形成稳定不溶的水络合物。本研究以8-羟基喹啉作为选择性络合沉淀剂，在稀土浸出液中络合沉淀铝。结果表明，当8-羟基喹啉的用量为理论反应量的1.25倍时；反应时间为十分钟；反应温度为60°C；溶液最终pH为4.5，Al3+去除率达到94.39%，RE3+损失仅为8.21%。此外，发现所得8-羟基喹啉铝具有沉淀速度快、晶粒大、夹带损失小、过滤容易完成等优点。此外，所得8-羟基喹啉铝的特性使其可作为具有较高市场价值的光电材料。