A problem arises when discharging rock into vertical or near vertical ore/waste passes and storage bins and is specifically the potential for contamination at the open tipping point with dusty air from the transient reverse airflow pulse caused by the air expansion when tipping stops. The higher the vertical sections of an ore or waste pass the greater the falling rock induced pressure increase leading to stronger transient back flow.Click here for the full pdf on Air Quality and Dust.
Thanks PMJ
