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金属磨球是选矿厂的大宗消耗件。目前,各矿山一次磨机所用的大直径磨球多采用锻钢球。由于钢球原料成本高,生产工艺复杂,硬度较低,因此近年有些选矿厂试用中锰稀土球墨铸铁球代替锻钢球。如东北某厂采用φ127毫米中锰稀土球墨铸铁球在1983年1—5月进行了单机装机试验,其耐磨性为锻钢球的1.36倍,耐冲击性也较好。但是也发现有一较大缺陷,就是铸球内存在缩孔和疏松,因而比重较低(比重为6.7,锻钢球为7.8),这样就减少
Metal grinding ball is a large mineral processing plant consumables. At present, the mill used in a large diameter grinding ball more forged steel ball. Due to the high cost of steel ball raw materials, the production process is complex, the hardness is low, so in recent years some beneficiation plant manganese rare earth ductile iron ball instead of forged steel ball. Such as a factory in northeast China with φ127 mm manganese rare earth ductile iron ball in January-May 1983 conducted a single machine installed test, the wear resistance of 1.36 times the forged steel ball, impact resistance is also better. However, it has also been found that there is a large defect that there is shrinkage cavity and looseness in the cast ball, so the proportion is lower (specific gravity is 6.7 and forged steel ball is 7.8), thus reducing