Abstract
A description is given of recent developments in flotation control strategy at Peak Downs Mine based on the ASHSCAN’coal gauge. Additional testwork undertaken to enhance this control strategy is detailed. Both short and long term behaviour is outlined, particularly in relation to the concentrate froth. Simple empirical relationships are derived between concentrate ash % and several key operating parameters. Froth mobility is discussed in terms of a sharp transitional phenomenon between two different froth regimes. In the mobile regime, characterised by free flowing watery froth, concentrate ash can be readily controlled by manipulating pulp level. However, no such control is possible in the immobile regime, characterised by a viscous dry froth. On-line data logging has also uncovered underlying long term plant cyclic behaviour.
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