development of column flotation technology at national metallurgical ...
development of column flotation technology at national metallurgical ...
development of column flotation technology at national metallurgical ...
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N<strong>at</strong>ional Metallurgical Labor<strong>at</strong>ory Madras Centre Page 6 <strong>of</strong> 10Design, Install<strong>at</strong>ion & Commissioning <strong>of</strong> Commercial Scale Flot<strong>at</strong>ion ColumnsBased on the successful demonstr<strong>at</strong>ion <strong>of</strong> semi-commercial <strong>flot<strong>at</strong>ion</strong> <strong>column</strong> (0.5 m diameter) for thebenefici<strong>at</strong>ion <strong>of</strong> sillimanite and limestone , commercial size <strong>column</strong>s were designed andcommissioned for the following industries.(a). Indian Rare Earths Limited, OSCOM,Ch<strong>at</strong>rapur, Orissa: A commercial size <strong>flot<strong>at</strong>ion</strong><strong>column</strong> <strong>of</strong> 1.3 m dia and 10 m height was designedto tre<strong>at</strong> 7 t/h <strong>of</strong> sillimanite for IREL and installed <strong>at</strong>OSCOM, Ch<strong>at</strong>rapur. The <strong>column</strong> is equipped withst<strong>at</strong>e-<strong>of</strong>-the-art electronic gadgets for the effectivecontrol <strong>of</strong> the slurry/froth interface, slurry feed, airand wash w<strong>at</strong>er flow r<strong>at</strong>es. An indigenouslydeveloped ceramic spargers were incorpor<strong>at</strong>ed towith stand the highly abrasive sillimanite particles.The <strong>column</strong> was successfully commissioned duringNovember 2005. The performance <strong>of</strong> the <strong>flot<strong>at</strong>ion</strong><strong>column</strong> was evalu<strong>at</strong>ed and it was observed th<strong>at</strong> the<strong>column</strong> produced excellent <strong>metallurgical</strong>results for the designed capacity.The sillimamnite concentr<strong>at</strong>e assaying 98% (after magnetic separ<strong>at</strong>ion) with the recovery <strong>of</strong> 90% wasobtained from <strong>flot<strong>at</strong>ion</strong> <strong>column</strong>. With the introduction <strong>of</strong> the <strong>flot<strong>at</strong>ion</strong> <strong>column</strong> in the sillimanite circuit,the production <strong>of</strong> sillimanite has been increased by about 40%.
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