Grinding Rate Functions

DmJl Diameter of mill m ft Su Grinding-rate function ... 

Grinding-Rate Functions These were determined by tracer experiments in laboratoiy mills by Kelsall et al. (op. cit.) as shown in Fig. 20-19 and in similar work by Szantho and Fuhrmann [Aujhereit. Tech., 9(5), 222 (1968)]. These cuives can be fitted by the following equation ... 

Equation (30) includes a term a grinding-rate function that corresponds to... 

Grinding Rate Function Let Wi = the weight fraction of material retained on each screen of a nest of n screens tcj is related to Pj, the fraction coarser than size Xj, by... 

There are few data demonstrating scale-up of the grinding-rate functions S and B from pilot- to industrial-scale mills. Weller et al. [Int. J. Mineral Processing, 22, 119-147 (1988)] ground chalcopyrite ore in pilot and plant mills and compared predicted parameters with laboratory data of Kelsall [Electrical Engg. Trans., Institution of... 

The size distribution of products from various types of size-reduction equipment can be predicted by a computer simulation of the comminution process. This makes use of two basic concepts, that of a grinding-rate function S and a breakage function A5 a. The material in a mill or crusher at any time is made up of partides of many different sizes, and they all interact with one another during the size-reduction process, but for purposes of computer simulation the material is imagined to be divided into a number of discrete fractions (such as the ones retained on the various standard screens) and that particle breakage occurs in each fraction more or less independently of the other fractions. 

Initial mass fractions and grinding-rate functions for Example 29.2... 

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