A pilot-scale beneficiation study for removal of alumina and silica prior to metallurgical sintering
摘要
Present study follows a beneficiation and characterization campaign for the alumina-silica rich iron ore prior to sintering. The collected ore had a mineral assay with Fe grade—60.03%, Al2O3—3.12%, and SiO2—7.86%, with 84.35% material of size above 0.5 mm, and a majority of hematite type. The end process being sintering no further size reduction is carried out restricting the further chances of liberation. Considering the high alumina and silica in the ore, a beneficiation treatment needs to be deployed. For which, a suitable beneficiation route is identified depending on the material characteristics, cost, and end-user requirements. A gravity concentration method was recommended due to its economy and suitability for a coarser feed size (− 10 + 0.15 mm). Under gravity separation, a jig-spiral route was levied where jig and spiral were utilized for treating the − 10 + 1 mm and − 1 + 0.15 mm fraction, respectively. Concentrates with a Fe grade of 64.97%, Al2O3—1.20%, and SiO2—1.65% was obtained. The concentrate obtained after beneficiation was then subjected to an in-depth characterization to seek out the occurrences if any have been advanced with respect to the as-received ore characterization. A substantial reduction was observed within the impurity constituent that highlights the efficacy of the followed beneficiation route. This campaign established a low operational expenditure process to reduce the alumina and silica from the iron ore.