The grindability of raw material is generally determined by Bond’s standard ball mill grindability test (developed by the Allis Chalmers company). The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic. The ore resistance to grinding and energy consumption can be expressed using the work index and Bond’s Third Theory. The Bond Third Theory method is widely used in the design of the grinding cycle, selection of grinding equipment, determination of required grinding power, and performance evaluation of the process. Despite widespread use for more than seventy years, doing a precise and complete Bond test can be challenging due to a variety of restrictions imposed by Bond. The initial size of the sample is strictly defined to be −3.35 mm. This paper describes the methodology for the determination of the Bond work index when coarse or fine raw material is found in the initial sample (i.e. when the initial sample not less than 3.35 mm).

原料的可磨性一般通过邦德的标准球磨机可磨性试验（由Allis Chalmers公司开发）来确定。球磨机可磨性测试用于描述矿石硬度，它非常普遍，以至于从测试中产生的粘结功指数通常被称为矿石特性。矿石的抗磨性和能耗可以用功指数和邦德第三理论来表示。Bond Third 理论方法广泛应用于磨削周期的设计、磨削设备的选择、所需磨削功率的确定和工艺性能评价。尽管已广泛使用 70 多年，但由于 Bond 施加的各种限制，进行精确和完整的 Bond 测试可能具有挑战性。样品的初始尺寸严格定义为-3.35 mm。本文介绍了在初始样品中发现粗或细原材料时（即初始样品不小于 3.35 毫米时）确定邦德功指数的方法。