The centrifugal pump is usually incorporated into another system and simply provides the transportation for material. Mining is effected using more mechanical means such as a hydraulically controlled arm or rotary drill head. Pumps currently being used range up to suction sizes of 600mm, being driven electrically and in some cases with variable speed control for optimum performance. Pumping efficiency is much higher than with airlift and depending upon the means of agitation can usually provide a higher solids ratio in pumped material. Flow rate is even (4-8m/sec) and so surface exit velocity remains similar to that at inlet, the advantage here is that the process plant inlet design is simpler and cheaper. Pumps can be deployed subsea i.e. onboard a subsea crawler, or housed onboard the surface vessel.

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2012-07-03

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