Grinding balls for ball mills (Ф20-Ф100)
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Ball mills are key grinding equipment for material pulverization. Steel balls, as the grinding medium, further grind the materials to achieve certain fineness requirements and obtain better grinding effects. Most mines use overflow ball mills. Materials such as ore are crushed and gradually flow towards the discharge end with the rotation of the cylinder and the movement of the grinding medium, finally overflowing from the hollow shaft neck at the discharge end. Therefore, compared with semi-autogenous mills, ball mills have a smaller diameter, smaller ore supply, smaller steel ball size, and relatively lower operating speed, with a higher filling rate. The purpose of crushing and grinding is mainly achieved through the impact and grinding of multiple steel balls on the ore. Materials and steel balls that do not reach a certain size cannot be discharged from the mill, which requires the steel balls to have high wear resistance. However, due to the complex working conditions inside the mill, when the steel balls are worn to a smaller diameter, unavoidable phenomena such as deformation and ovalization are likely to occur, resulting in reduced grinding efficiency. If the hardness is too high, it cannot disappear quickly, occupying part of the effective filling rate of the mill, causing energy waste, and being unfavorable for mine energy saving and emission reduction.
After in-depth discussion and analysis, Jinpu New Materials Co., Ltd., through the analysis and research of the failure mechanism of steel balls, combined with the actual operating conditions of ball mills, and through the research of steel ball materials and supporting heat treatment processes, has developed special steel balls suitable for ball mills. Within the effective use volume, the hardness is high and the wear resistance is good. When the diameter is smaller, the hardness is appropriately reduced, thereby ensuring that the grinding effect is not reduced, reducing the waste of the effective filling rate of the ball mill, improving grinding efficiency, and contributing to the mining industry. Through actual use in large foreign mines, steel ball wear has been reduced by 15% to 20%, significantly improving mine production efficiency, and has been fully recognized by mine leaders and employees.
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