apr 06, 2021 these types of mills are low-speed pulverizer grinding machine that grinds coal with steel balls in a cylinder that is horizontally rotated. they are both terms are ball tube mills due to its shape and the ball grinding structures. medium speed. medium speed pulverisers include ring and ball mill, bowl mill, and vertical spindle roller mill.,application grinding mills motornostix,applications grinding mills are a critical component in mining processing and downtime can lead to costly production losses. with a motornostix solution you can know at all times the health status of the motor, gearbox, pinion bearings and trunnions so that breakdowns can be prevented and maintenance tasks can be performed timeously.