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Abstract
This work presents a semi-smelting reduction and magnetic separation process for the recovery of iron and alumina slag from iron rich bauxite ore. The effect of the process parameters on the recovery rate of iron, maximum particle size of the iron nugget, and the Al2O3 content of the alumina slag was investigated and optimized. The results show that the iron nuggets and alumina slag can be obtained in a short time through a semi-smelting reduction and magnetic separation process. The maximum particle size of iron nugget is about 15 mm, and the recovery rate of the iron and Al2O3 grade of the alumina slag are 96.84 wt % and 43.98 wt %, respectively. The alumina slag consisted mainly of alumina (α-Al2O3), calcium hexaluminate (CaAl12O19), gehlenite (Ca2Al2SiO7), and small amounts of hercynite (FeAl4O7), and metallic iron (M.Fe).
Highlights
At present, more than 0.5 billion tons of iron rich bauxite in western Guangxi, China, have been explored [1,2,3]
Numerous studies show that the synchronous extraction of Al and Fe is difficult to achieve using acid treatments, which can only be used for the selective chemical dissolution of goethite (FeOOH) and gibbsite (Al(OH)3 ) [8,9]
Zhang et al [22] reported a semi-smelting reduction and magnetic separation process to recover the iron nuggets from bauxite under a higher basicity condition. They found that the highest recovery rate of the iron nuggets was 92.79 wt %, and the high quality iron nugget consisted of iron (96 wt %–97 wt %) and carbon (2.5 wt %–3.0 wt %) with a low gangue content
Summary
More than 0.5 billion tons of iron rich bauxite in western Guangxi, China, have been explored [1,2,3]. Zhang et al [22] reported a semi-smelting reduction and magnetic separation process to recover the iron nuggets from bauxite under a higher basicity condition. They found that the highest recovery rate of the iron nuggets was 92.79 wt %, and the high quality iron nugget consisted of iron (96 wt %–97 wt %) and carbon (2.5 wt %–3.0 wt %) with a low gangue content. Semi-smelting reduction and magnetic separation technology was employed to recover iron and alumina slag from iron rich bauxite under a lower basicity condition. The properties of the iron nugget and the phase composition of the alumina slag were investigated
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