Ball mill is suitable for grinding kinds of minerals, and it is widely used in beneficiation, building materials, and chemical industry, which is divided into dry and wet type grinding. According to different ways of discharge, ball mill is classified into grid ball mill, overflow ball mill, and peripheral discharge ball mill.
Wet grid ball mill is composed with cylinder: wearable lining board is inlayed in cylinder inside, and two ends have flange, which is connected with end cover of mill by bolts. Ore feeding end: includes end cover, hollow axis cervical, and ore feeder three parts. Discharge part includes grid liner, end cover and discharge hollow. Main bearing, lubrication system, and transmission system.
In working process of grid ball mill, minerals inside move towards discharge part with the pressure of feeding part. There are ladder discharge holes in grid liner of discharge part, and the minerals which are qualified with grinding fineness enter into sectorial ventricular back side of grid liner. Minerals rotate with cylinder. Meanwhile, the slurry is raised to high, flow into discharge hollow axis cervical, and it is discharged finally. Therefore, grid ball mill belongs to a kind of low-level forced discharge, and the fine minerals are discharged in time, reducing over-grinding. Since grid ball mill’s discharge liquid level is lower than that of overflow, maximum density fine minerals are not like those in overflow ball mill, in which minerals have faster free settling speed, leading to discharge difficulty, and taking up ball mill working space. Meanwhile, due to limited size of discharge holes in grid liner, steel balls inside of ball mill will not be discharged with minerals. Big and little steel balls are used together in grid ball mill, contributing to improving grinding efficiency. Wet grid ball mill has a faster speed of discharge. Therefore, unit volume capacity is bigger than that of same specification overflow ball mill.