The demand for bauxite has increased sharply due to the fast development of alumina industry, so new technology must be developed to take full advantage of nontraditional bauxite resources to realize a continuous supply of bauxite. In this experiment, anatase sulfuric acid leaching liquor is taken as the research object to conduct aluminum–iron separation and high-purity alumina preparation. The leaching solution contains 34.20 g/L of Al₂O₃, 25.30 g/L of TFe, 7.96 g/L of TiO₂, 12.74 mg/L of Sc₂O₃, and 288.72 g/L of H₂SO₄. When the temperature is low, aluminum and iron condensation, which are not conducive to the separation and recovery of various elements, may occur easily. In this study, the ammonium aluminum sulfate crystallization–recrystallization and ion exchange–calcination method is adopted to effectively separate aluminum and iron in a strong acid solution comprising high concentrations of aluminum and iron without consuming high residual acid in the leaching liquor. Consequently, successful production of high-added-value product 4N (99.99%) level γ-Al₂O₃ with ammonium aluminum sulfate is obtained through separation as the raw material. The product has a specific surface area of 7.845 m²/g with a nearly spherical shape and being evenly distributed. Therefore, it realizes high-value aluminum utilization from nontraditional bauxite.

中文翻译：

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高酸浸出液中铝铁分离及高纯氧化铝制备

由于氧化铝行业的快速发展，对铝土矿的需求急剧增加，因此必须开发新技术，充分利用非传统铝土矿资源，实现铝土矿的持续供应。本实验以锐钛矿型硫酸浸出液为研究对象，进行铝铁分离和高纯氧化铝制备。浸出液含Al ₂ O ₃ 34.20 g/L、TFe 25.30 g/L、TiO ₂ 7.96 g /L、Sc ₂ O ₃ 12.74 mg /L、H ₂ SO ₄ 288.72 g/L. 温度低时，容易发生铝、铁冷凝，不利于各种元素的分离和回收。本研究采用硫酸铝铵结晶-重结晶和离子交换-煅烧方法，在含有高浓度铝和铁的强酸溶液中有效分离铝和铁，同时不消耗浸出液中的高残留酸。从而以硫酸铝铵为原料，成功生产出高附加值产品4N（99.99%）级γ-Al ₂ O ₃。该产品的比表面积为 7.845 m ²/g 近似球形，分布均匀。因此，它实现了非传统铝土矿的高价值铝利用。