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Development of a process flowsheet for the beneficiation of low-grade iron ore fines from the Bellary-Hospet region of Karnataka, India

Minerals & Metallurgical Processing , 2014, Vol. 31, No. 3, pp. 162-168

Umadevi, T.; Abhishek, K.; Singh, A. Pratap; Sah, R.


It was possible to beneficiate a low-grade iron ore fines sample from Bellary-Hospet, Karnataka, India assaying
56% Fe, 9.1% SiO2 and 5.2% Al2O3 and produce two concentrates, namely, a sinter-grade fines concentrate
(43.7% by weight), assaying 63.6% Fe, 2.6% SiO2 and 1.7% Al2O3, and a pellet-grade concentrate (30.7% by
weight) assaying 64.7% Fe, 2.9% SiO2 and 1.7%Al2O3. Rejects (25.6% by weight) assayed 32.5% Fe, 27.9%
SiO2 and 15.4% Al2O3. The mineralogical characterization indicated that the sample consisted of 69.5% ironbearing
minerals (56% hematite, 7.5% martite and 6% goethite-limonite), 12.5% quartz and 15.2% clay, and
the rest were minor minerals. Liberation size was found to be in the size range of 25 to 100 μm. The process
flow sheet consists of jigs, spirals, grinding and low- and high-intensity magnetic separation of the deslimed feed.