Control of the drying kilns, indurating machine burners and grinding circuits with conventional PID controllers is unstable, mainly due to process delays.
APC for metals
maintained the individual temperature profile, delivering a 15% reduction in standard deviation for the indurating machine temperature profile along the indurating machine burner zone, improving pellet quality and reducing burner fuel consumption by ensuring burn-out temperature is reached at the right location.
APC maintained the outlet temperature of the iron ore dryer at the desired setpoint despite intermittent disturbance in feed rate and process delays.
APC was installed on a grinding circuit that included a roller-press with static V-separator and single chamber ball mill, improving control performance with a 4% productivity increase, 3% energy savings and 60% reduction of returns standard deviation.