The steel balls will be the most important grinding medium of Ore Milling Equipment . The more substantial and heavier the steel balls are, the more powerful the impacting force is. The grinding capacity of steel balls is decided by its wear-resistant capacity and hardness, and to the hard grinding ore with wonderful hardness and tight construction, we ought to include additional significant and heavy steel balls into the ball mill. On the other hand, to be able to ensure that the efficiency of grinding fine particles and boost the impacting times inside a unit interval, a lot more tiny steel balls need to be added. The proportion, hardness, composition and toughness of steel balls are the key technical indicators from the steel ball. In accordance together with the common prerequisites, the proportion of forged steel ball and rolling steel ball is seven.8, the proportion of steel ball and cast iron ball is 7.5, but it could possibly be decreased to seven.1 if there have been also many sand holes. Cast iron ball has more carbon, but the hardness doesn’t meet the needs and there are also a lot of sand holes and hollow balls. Compact proportion will always lead to serious broken situation. The quality of steel balls decreases, so the grinding efficiency decreases obviously, and the efficiency of ore beneficiation will be influenced, however the single consumption of balls is increased. So, we should really choose grinding balls with good hardness and toughness, and cast steel ball and forged steel ball are much suitable. After the calculation of suitable diameter of balls and relative granularity of feeding ore, the proportion of steel ball will be reasonably made the decision according to the nature of granularity with the total feeding amount ( newly-fed ore and returning ore) in the ball mill—the proportion problem of steel ball. The procedures are: (1) determination in the sand back than on the sand back to the ball mill to the mine sieve analysis. Ball mill total feed size characteristics drawn curve calculated according to the results with the sieve analysis. (2) According to the characteristic curve of total feed size and suitability with the ball diameter - to the ore particle size is calculated should really be additional to the proportion of different size steel balls. (3) calculate according to the proportion from the total plus ball and the ball should be additional to each level ball. 

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