Journal
TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY SECTION C-MINERAL PROCESSING AND EXTRACTIVE METALLURGY
Volume 125, Issue 3, Pages 126-131Publisher
TAYLOR & FRANCIS AS
DOI: 10.1080/03719553.2016.1155687
Keywords
REFLUX (TM) Classifier; Iron ore; Beneficiation; Ultra fine; Density separation
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Funding
- Australian Research Council
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The REFLUX (TM) Classifier is a recently developed water-based gravity separation technology that is already being used worldwide to beneficiate particles above 0.100 mm in size. This paper reports tests performed on an ultra-fine iron ore with nominal top size of 0.106 mm, but with 59 wt-% being below 0.038 mm in size. The REFLUX (TM) Classifier consists of a set of parallel inclined channels positioned above a vertical fluidised section. The Boycott effect generates a powerful throughput advantage and using narrow channels gives a high shear rate which generates a hydrodynamic lift force that helps to selectively re-suspend and elutriate the lower-density particles. The iron ore feed had a head grade of 35 wt-% Fe-T. At a low feed solids mass flux of 1.5 t m(-2) h(-1), the REFLUX (TM) Classifier produced high-grade products at a high recovery. Overall a grade of 66.1 wt-% Fe-T with Fe recovery of 80 wt-% could be achieved in a single-stage separation. Within the 0.020-0.038 mm size fraction, grades of 68.8 wt-% Fe-T were achieved with iron recoveries of 94.7 wt-%. Excellent recoveries of up to 57.0 wt-% were achieved even for the -0.020 mm size fraction.
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