Influence of Na2CO3 and K2CO3 Addition on Iron Grain Growth during Carbothermic Reduction of Red Mud

Metals - Tập 9 Số 12 - Trang 1313
Dmitry Zinoveev1, Pavel Grudinsky1, Andrey Zakunov2,1, A. F. Semenov1, Maria Panova1, Dmitry Valeev3,4, A. Kondratiev4, V. G. Dyubanov1, A. L. Petelin2
1Laboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky prosp, 119334 Moscow, Russia
2Department of Energy-Efficient and Resource-Saving Industrial Technologies, National University of Science & Technology (MISIS), 4 Leninsky prosp., 119049 Moscow, Russia
3I.P. Bardin Laboratory for Problems of Metallurgy for Complex Ores, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky prosp., 119334 Moscow, Russia
4Scientific Research Centre “Thermochemistry of Materials”, National University of Science & Technology (MISIS), 4 Leninsky prosp, 119049 Moscow, Russia

Tóm tắt

Red mud is a by-product of alumina production from bauxite ore by the Bayer method, which contains considerable amounts of valuable components such as iron, aluminum, titanium, and scandium. In this study, an approach was applied to extract iron, i.e., carbothermic reduction roasting of red mud with sodium and potassium carbonates followed by magnetic separation. The thermodynamic analysis of iron and iron-free components’ behavior during carbothermic reduction was carried out by HSC Chemistry 9.98 (Outotec, Pori, Finland) and FactSage 7.1 (Thermfact, Montreal, Canada; GTT-Technologies, Herzogenrath, Germany) software. The effects of the alkaline carbonates’ addition, as well as duration and temperature of roasting on the iron metallization degree, iron grains’ size, and magnetic separation process were investigated experimentally. The best conditions for the reduction roasting were found to be as follows: 22.01% of K2CO3 addition, 1250 °C, and 180 min of duration. As a generalization of the obtained data, the mechanism of alkaline carbonates’ influence on iron grain growth was proposed.

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