Correction to: “Advanced Method for Recycling Red Mud by Carbothermal Solid-Phase Reduction Using Sodium Sulfate”

Grudinskii, P. I.; Zinoveev, Dmitry; Semenov, A. F.; Zakunov, Andrey; Dyubanov, V. G.; Петелин, А. Л.

doi:10.1007/s11015-020-00958-1

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“…Hence, to promote iron grain segregation, special additives are used, mainly alkali and alkaline earth metal salts. If Na 2 CO 3 [41][42][43], Na 2 SO 4 [39,[44][45][46], Na 2 B 4 O 7 [47], K 2 CO 3 [48], KCl [49], CaF 2 [50] were used for solid-phase carbothermic reduction of red mud, high iron recovery and high grade of the concentrates could have been achieved. As reported in our previous work [48], the roasting of red mud with addition of 17.1% Na 2 CO 3 or 22.05% K 2 CO 3 at 1300 • C for 180 min followed by magnetic separation resulted in iron recovery of 77.27% and 85.54%, respectively, and iron concentrate with grade of about 72% in both cases.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sodium Sulfate Addition on Iron Grain Growth during Carbothermic Roasting of Red Mud Samples with Different Basicity

Grudinsky

Zinoveev

Pankratov

et al. 2020

Metals

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Red mud is an iron-containing waste of alumina production with high alkalinity. A promising approach for its recycling is solid-phase carbothermic roasting in the presence of special additives followed by magnetic separation. The crucial factor of the separation of the obtained iron metallic particles from gangue is sufficiently large iron grains. This study focuses on the influence of Na2SO4 addition on iron grain growth during carbothermic roasting of two red mud samples with different (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21, respectively. Iron phase distribution in the red mud and roasted samples were investigated in detail by Mössbauer spectroscopy method. Based on thermodynamic calculations and results of multifactorial experiments, the optimal conditions for the roasting of the red mud samples with (CaO + MgO)/(SiO2 + Al2O3) ratio of 0.46 and 1.21 were duration of 180 min with the addition of 13.65% Na2SO4 at 1150 °C and 1350 °C followed by magnetic separation that led to 97% and 83.91% of iron recovery, as well as 51.6% and 83.7% of iron grade, respectively. The mechanism of sodium sulfate effect on iron grain growth was proposed. The results pointed out that Na2SO4 addition is unfavorable for the red mud carbothermic roasting compared with other alkaline sulfur-free additives.

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