Abstract
The influence of medium viscosity on dense medium cyclone performance, and the influence of various factors on medium viscosity, are briefly reviewed. Experimental work was carried out in the DM cyclone preconcentration plant at Mount Isa Mines to investigate the effect of using demagnetising coils to reduce the viscosity of the circulating ferrosilicon medium. The effect on viscosity of natural fine contamination from the ore, including magnetic pyrrhotite, was also studied by replacing the medium charge with fresh medium and then allowing it to become re-contaminated. The viscosity of the circulating medium was monitored over a range of operating densities using an on-line viscometer. It was found, as expected, that operation of the demagnetising coil significantly reduced viscosity, and that the viscosity of the contaminated medium was much higher than that of the fresh medium. It is recommended that demagnetising coils be considered for all DM cyclone plants operating with ferrosilicon media.
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