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Processing Studies on Banded Hematite Quartzite’s of Sandur Sciht, Karnataka, India
oleh: Aspari Kumara Swamy, Suresh Nikkam, Palthur Sharath Kumar
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-03-01 |
Deskripsi
The greater demand for high-quality iron ores has forced the iron and steel industries to utilize low-grade iron ores, such as banded hematite quartzite (BHQ). In the present work, a striped hematite quartzite sample from the Haraginadoni area, in the Sandur schist belt, Ballari District, Karnataka, India, was subjected to characterization studies and conventional mineral processing methods to produce pellet-grade concentrate, assayed as Fe > 63.0%, SiO<sub>2</sub> + Al<sub>2</sub>O<sub>3</sub> < 7%, (Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> < 0.5). The sample was analyzed as 35.70% Fe, 47.44% SiO<sub>2</sub>, 0.75% Al<sub>2</sub>O<sub>3</sub>, 0.06% Mn, 0.07% TiO<sub>2</sub>, 0.03% P, 0.02% S, and 0.83% LOI. We focused on two routes of beneficiating BHQ samples: (1) conventional gravity followed by reverse floatation and (2) magnetic separation followed by cleaning of magnetic concentrate by reverse floatation. Route 1, achieved pellet-grade concentrate through assaying, and was 63.73% Fe, 6.20% SiO<sub>2</sub>, 0.19% Al<sub>2</sub>O<sub>3</sub>, 0.03% Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>, and 0.23% LOI, D<sub>80</sub> 45 µm, with 70.1% Fe recovery and 62.8% concentration efficiency at 39.6 wt% yield. Using Route 2, the process consisted of WHIMS at −74 µm, D<sub>80</sub> 54 µm, 10,000 Gauss, and with a 3 mm ball matrix, followed by flotation of the WHIMS concentrate, which produced a concentrate through assaying and was 63.34% Fe, 6.30% SiO<sub>2</sub>, 0.20% Al<sub>2</sub>O<sub>3</sub> (0.03 Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub>), and 0.20% LOI with 77.4% Fe recovery, achieving a 68.8% concentration efficiency at 44.0 wt% yield, meeting pellet-grade specifications. Comparing and analyzing both routes for the concentration methods, Route 2, i.e., WHIMS and the reverse flotation of WHIMS concentrate, was amenable compared to Route 1.