Segregation and Process Features in a Teeter Bed Separator as Revealed by High Speed Videography and Image Processing

Roy, Subrata and Mandal, S K and Das, Avimanyu (2012) Segregation and Process Features in a Teeter Bed Separator as Revealed by High Speed Videography and Image Processing. Mineral Processing and Extractive Metallurgy Review: An International Journal, 06 Aug 2012 .

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Gravity concentration in a liquid fluidized bed floatex density separator (FDS) was investigated through high speed videography and image analysis. Process performance in terms of yield and grade of the product for fine coal beneficiation in the FDS was established experimentally. The feed coal (-1.18 mm) with 36% ash was enriched to 24% ash at a mass yield of 65%. Coarsest underflow with a d50 of 700 µm was obtained at 5.8 kPa bed pressure, 120 kg/h feed rate and 12 lpm teeter water flow. The lowest SG50 of 1.62 was obtained at 5.4 kPa, 15 lpm and 80 kg/h. At 9 lpm water flow, steady state was achieved in 400 sec when the voidage and suspension density distributions became constant. From the suspension density distribution, the SG50, 1.69 under this set of conditions, was estimated with reasonable accuracy. Increase in teeter water was shown to increase the time required for attaining steady state. It was established that particle size distribution at the bottom of the bed in the column offers a good indication of the separation performance. The influences of the operating variables on the axial steady state profile of the suspension density and voidage were also established. Image analysis is shown to be quite useful in collecting quantitative transient and steady state data that may be difficult to obtain otherwise. The process performances were adequately described using such transient and steady state observations.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:image analysis, partition curves, suspension density, transient state, voidage
Divisions:Mineral Processing
ID Code:5975
Deposited By:Dr. A K Sahu
Deposited On:30 Aug 2012 10:07
Last Modified:15 Jan 2014 13:08
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