metal-magnetic scale-board for ball mill. The abrasion of scale-board for general ball mill is due to the scale-board directly contact with mine slurry and medium of mine-milled. The main abrasion is occur between steel balls and scale-board, as well as corrosion from electro-chemistry etc. While it will be different with the magnetic scale-board because of using an alternate array. It is installs on the inner space wall of ball mill body and formed the system with curve magnetic surface.

It forms quite adequate strong magnetic field. During work, the broken ball and magnetic mine materials adsorbing on the surface of scale-board, formed a steel ball protecting layer. Due to this layer is firmly adsorbed on the surface of magnetic scale-board, prevent direct contact the medium slurry with inner surface of ball mill, greatly decrease the mechanism of abrasion and electro-chemistry corrosion by slurry and others medium to the ball mill scale-board. Enormously lengthen the operating life. Therefore the magnetic scale-board was named "The scale-board without abrasion forever". Generally speaking, the usage the magnetic scale-board is several times even can say in several ten times longer than the life of high-manganese steel scale-board.

metal-magnetic scale-board works reliably. There are no leakage of mine from mill case. It is convenient for assembling and disassembling. To increase the efficiency of grinding. Do not make any blight toward next operation. This constructive decision help to keep a balls in working state and reduce the power consumption. The demagnetization and wearing of scale-board are quite small, the working life can reach 6-8 years that in 4~6 times longer than the working life with steel lining.