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度量原料可磨度的邦德(Bond)功指数W_1不是一个物料常数,它随着磨矿产品粒度的变化而变化。因此实践中对于给定的磨矿产品粒度,若没有相应的由试验所确定的功指数W_1的数值,则根据公式计算能耗会有困难和误差。本文对上述问题进行研究并提出了解决办法。对铜矿石、安山岩和石灰石进行了试验,结果发现,通过试验筛的物料量G与筛孔尺寸P_k的关系可由下式确定:G=K_1(P_k)~(1/2)对于邦德球摩机而言,磨矿产品粒度P是磨矿产品通过80％的筛孔尺寸;P与试验筛筛孔尺寸P_k的函数关系可以用公式P=P_k/K_2表示。如果我们知道了功指数W_1和筛孔尺寸P_k,根据G与P的上述关系式,可以计算与任何磨矿产品粒度对应的W_1值。
The Bond work index W_1, which measures the degree of shapability of a raw material, is not a material constant and varies with the particle size of the grinding product. Therefore, in practice, for a given particle size of the grinding product, there would be difficulties and errors in calculating the energy consumption according to the formula without a corresponding numerical value of the work index W_1 determined by the test. This article studies the above problems and proposes solutions. The results of the tests on copper ore, andesite and limestone show that the relationship between the material quantity G passing through the test sieve and the mesh size P_k can be determined as follows: G = K_1 (P_k) ~ (1/2) In the case of a friction machine, the particle size P of the grinding product is the mesh size of the grinding product passing 80%; the function of P as a function of the mesh size P_k can be expressed as P = P_k / K_2. If we know the work index W_1 and the mesh size P_k, the W_1 value corresponding to the grain size of any grinding product can be calculated from the above relation of G and P.