97/03538 Wet grinding of coal in the Szego mill

Abstract

New results from a systematic grinding study with the larger, SM 320 Szego Mill are reported. A wide range of flow rates, from 750 to 5300 kg/h of coal, at 60-65% solids concentration has been covered, with both single and multiple passes through the mill. Particle size distributions and power consumption have been measured. Data have been correlated in terms of the mass fraction of particles passing various mesh sizes 45{mu}m and up, also for the required energy consumption. Comparison with results from smaller mills and with scale-up criteria has been made. A dynamic wet-grinding model recently developed for the Szego Mill is reviewed. Use of this model will allow a priori predictions of limiting performance for all design and operating variables in the {open_quotes}past grinding{close_quotes} regime, i.e., at relatively high solids concentrations, optimal for wet grinding in the Szego Mill. Detailed comparisons with model predictions are yet to be made.