Abstract
To identify and establish beneficiation techniques for slime, a comprehensive research work was carried out on beneficiation plant 2 thickener underflow (Tailing). Iron ore slimes (-45 micron ~80.0%) generated at beneficiation plant 2 assaying 46.7% Fe, 10.82% SiO2, and 4.58% Al2O3 have been subjected to various beneficiation studies like cyclone, wet high intensity magnetic separator and flotation to recover the iron bearing minerals. The effects of different operating parameters have been studied to get a product suitable for pellet making. Detailed beneficiation studies indicate that it is possible to obtain a product containing 61.8% to 66.6% Fe, 1.80% to 3.35% SiO2, and 1.65% to 2.40% Al2O3 with 8.0% to 22.3% weight recovery by adopting de-sliming followed by magnetic separation. Within this product grade range the pellet grade fines (JSW norms-minimum 63.0% Fe) consist of 63.0% Fe, 2.97% SiO2 and 2.48% Al2O3 with 16.9% weight recovery and 56.9% Fe recovery at 0.5 Tesla magnetic field intensity, pulsation rate 230 rpm and 2 min residence time.
Highlights
In JSW Steel Limited, iron ore is being beneficiated to meet the quality requirement for iron making units
Detailed beneficiation studies indicate that it is possible to obtain a product containing 61.8% to 66.6% Fe, 1.80% to 3.35% SiO2, and 1.65% to 2.40% Al2O3 with 8.0% to 22.3% weight recovery by adopting de-sliming followed by magnetic separation
From the size analysis it was realized that the separation of gangue minerals from iron in the bulk ore by any classification technique, which had been used to treat typical Indian iron ore slimes where gangue materials preferentially accumulated in finer sizes, would be effective
Summary
In JSW Steel Limited, iron ore is being beneficiated to meet the quality requirement for iron making units. The beneficiation of iron ore slime produced from washing plants and tailing ponds of Kiriburu mines was studies [1] using wet high intensity magnetic separator followed by classification in a hydrocyclone. They showed that a concentrate assaying 63% Fe and 3.3% alumina could be produced with an overall iron recovery of 56%. Das et al [2] studied iron ore slimes from Barusa, Bolani and Kiriburu using classification by hydrocyclone followed by wet high intensity magnetic separation Their results indicated that a concentrate assaying 60% to 65% Fe with 60% to 80% recovery can be obtained. In the present case magnetic separation and flotation process were adopted on hydrocyclone product to study the slimes of the size 25 to 50 micron size
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