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MEI Online: Plant Operation News: Africa: July 9th 2004

 
 

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:: Flotation Plant for Greenside Colliery

AngloCoal has awarded the contract for a 60tph fine coal flotation plant at Greenside Colliery to Dowding, Reynard & Associates (DRA). The contract, valued at R30M, was awarded in September last year and is expected to boost coal production from the colliery by approximately 30tph of additional export product.

The flotation plant will treat the slimes from three existing dense media modules originally built by DRA. Construction commenced at the end of October 2003 and commissioning is targeted for the end of June this year. The plant will make use of flotation cells that have been developed by AngloCoal. Slimes from two existing thickeners will automatically be diluted to the correct slurry density and distributed evenly to four sets of multi-cells. Mass flow will be measured, and collector and frother dosing added at a controlled rate for consistent, optimal flotation performance. Instrumentation on the flotation units will allow automatic control of the mass pull and product quality.

Flotation concentrates gravitate to a surge tank/thickener. The tails gravitate to a tailings thickener and are pumped to the existing tailings disposal system. Flotation concentrates are dewatered with spiral plant product using solid bowl centrifuges. The centrifuges are fitted with variable speed main drives and scroll drives, allowing the facility to optimise throughput and final product moisture. To avoid problems associated with reagent contamination, the flotation plant water circuit is independent of the water circuits in the dense medium plants.

 

 

   

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