Abstract
An on-stream coal slurry analyser for both ash and % solids has been developed co-operatively by the Julius Kruttschnitt Mineral Research Centre and the Utah Development Company Limited. An industrial prototype of this unit has been operating successfully at the Peak Downs coal preparation plant since April 1984, and has been used for automatic control of a bank of coarse flotation since January 1985.This paper will include a brief description of the ASHSCAN coal slurry analyser together with details of its accuracy. An analysis of the limitations of present manual control will precede a discussion of computer control of flotation utilizing the ASHSCAN signals to control cell level and reagent addition. The aim of the control is to use the ash and % solids assays from the feed, concentrate and tailings streams to maintain the concentrate ash at specification ash while maximizing recovery.
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