Abstract
In this study, extraction of aluminum-, iron-, and titanium-bearing constituents from diaspore-type bauxite ores was investigated by stepwise treatment consisting of pre-desilication via alkali-leaching of bauxite ore, extraction of alumina via Bayer process, and recovery of iron from red mud via magnetic separation. The pre-desilication results showed that the removal of silica reached 73.92% and that the mass ratio of alumina to silica (A/S) of bauxite concentrate increased from 2.92 to 9.25 under the conditions of sodium hydroxide concentration of 50 wt.%, leaching temperature of 95°C, leaching time of 30 min, and liquid-to-solid ratio of 5 mL/g. A total of 96.31% alumina was extracted from the bauxite concentrate via the Bayer process. Subsequently, by using two-step magnetic separation (intensity: 0.8 T and 0.2 T), TiO2-bearing iron concentrate with total iron grade of 56.39% and TiO2 grade of 8.66% was obtained with recoveries of iron and TiO2 of 55.79% and 17.37%, respectively. The grade of TiO2 reached 21.22% in the nonmagnetic fraction.
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Acknowledgements
The authors wish to express their thanks to the National Natural Science Foundation of China (Nos. 51234008 and 51174230) for financial support. This work was also financially supported by the Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources.
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Li, G., Gu, F., Jiang, T. et al. Beneficiation of Aluminum-, Iron-, and Titanium-Bearing Constituents from Diasporic Bauxite Ores. JOM 69, 315–322 (2017). https://doi.org/10.1007/s11837-016-2215-4
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DOI: https://doi.org/10.1007/s11837-016-2215-4