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Effect of Grinding Media Type on Ball Mill Capacity

机译：研磨介质类型对球磨机的影响

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In recent years, the use of high-chromium cast grinding media has been promoted as an alternative for use in conventional grinding applications with the argument of an improvement in the recovery of minerals in the flotation process, however as at this point in time the concept has not been demonstrated conclusively. During investigations into the use of high chromium cast grinding media, a fundamental aspect, which is the effect of the grinding media density on ball mill throughput has been neglected. If we consider the very well demonstrated concept: That the milling process is based on the amount of energy generated to obtain a given product (P80), and the energy demand is directly related to the mill speed and ball charge weight, with the latter dependent on the bulk density of the load. Then it is valid to argue that the mill power draw primarily depends on the grinding media density.In recent years, the Moly-Cop group has carried out several laboratory evaluations of the effect of different grinding media types, these tests have demonstrated that high-chromium cast grinding media generates up to 4 % less power than the forged grinding media under the same conditions.Recently, a copper concentrator undertook an industrial evaluation trial using high chromium cast media. After 4 months of evaluation they verified that the power generation was as much as 5 % less in comparison to the same sized forged media. The most significant result was an average throughput reduction of 6 % during the testing period. In addition to the decreased power observed during the testing period, a coarser ball mill discharge product was also identified as well as no observed improvement in recovery due to the use of high chromium cast grinding media.
机译：近年来，使用高铬铸造研磨介质的使用是作为常规研磨应用的替代方案，其具有改善浮选过程中矿物质的改善的论点，但是在这一点的概念中尚未得到最终证明。在研究使用高铬浇铸介质的使用期间，忽略了基本方面，这是研磨介质密度对球磨机产量的影响。如果我们认为非常熟悉的概念：铣削过程基于所产生的能量量，以获得给定产品（P80），并且能量需求与研磨速度和球电荷重量直接相关，后者依赖关于负荷的堆积密度。争辩说，轧机主要取决于研磨介质密度。近年来，莫利康集团对不同研磨介质类型的效果进行了几种实验室评估，这些测试表明了很高铬铸磨介质在相同条件下产生的功率高达4％的功率。即，铜浓缩器采用高铬铸造介质进行了工业评价试验。在4个月的评估后，与相同大小的伪造介质相比，发电量比相同的备用介质相比减少5％。最显着的结果是测试期间平均吞吐量为6％。除了在测试期间观察到的功率降低之外，还鉴定了较粗的球磨机排出产品，也没有由于使用高铬浇铸磨介质而无法观察到的恢复改善。

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