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An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Metals 2020, 10(1), 57; https://doi.org/10.3390/met10010057
Received: 22 November 2019 / Revised: 21 December 2019 / Accepted: 24 December 2019 / Published: 28 December 2019
In this study, a novel process was established for extraction of Fe and Al from a complex high aluminum iron ore (33.43% Fetotal and 19.09% Al2O3). The main steps in the proposed process included pre-reducing high alumina iron ore and subsequent smelting to produce pig iron and rich-alumina slag, followed by alkaline leaching of the slag to obtain sodium aluminate solution and a clean slag. When smelting the pre-reduced high alumina iron ore pellets at 1625 °C for 30 min with a slag basicity of 0.40, the pig iron yielded 97.08% Fe and extracted 0.13% Al2O3, together with an iron recovery of 94.54%. In addition, more than 68.93% Al2O3 was recovered by leaching the slag, which was achieved by firstly roasted the slag at 900 °C for 2 h and then alkaline leaching at 95 °C for 2 h with a liquid-to-solid ratio of 10 mL/g. In addition, the alkaline leaching slag could potentially be used as raw material for construction purpose, which mainly consisted of SiO2 and CaO. View Full-Text
Keywords: high-aluminum iron ore; smelting separation; modification; alkaline leaching high-aluminum iron ore; smelting separation; modification; alkaline leaching
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Li, S.; Pan, J.; Zhu, D.; Guo, Z.; Shi, Y.; Chou, J.; Xu, J. An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron. Metals 2020, 10, 57.

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