Feasible Beneficiation Studies to Enrich Grade and Recovery by Adopting Grinding Followed by Gravity and Magnetic Separation

The recovery of Fe from an oversized sample in a spiral classifier upgrades a 55% Fe to 59% Fe output in a size range (- 3 mm + 150 mu m). The output was subjected to fine grinding making it suitable for pellet plant. The ground fine ore was subjected to 2 processing routes: gravity concentration followed by magnetic separation. The tailing after gravity separation was subjected to magnetic separation with varying Gauss. One set of Fe enrichment was achieved in the concentrate after gravity separation and in the mag part of magnetic separator. The overall concentrate was 61.38% Fe, 4.53% SiO2, and 2.97% Al2O3, with an yield of 83.45%. The Fe recovery was 86.27%. Alternately, fine ore was directly subjected to magnetic separation at 8000 Gauss, enriching the ore to 65.12%Fe with 48.15% yield which corresponds to 52.81% Fe. Thus, gravity concentration followed by magnetic separation gave higher grade, yield and Fe recovery.