Mining University (Russia):

Andreev Ye. Ye., Associate Professor, opiopi@bk.ru

Zakhvatkin V. V., Associate Professor, opiopi@bk.ru

Lvov V. V., Associate Professor, opilvv@mail.ru

Nikolaeva N. V., Lecturer, opiopi@bk.ru

Testing of materials with different strength by means of falling weight by JKTech, intended for determination of disintegration functions (occurrence) of ore five size fractions in the range from 13 to 63 mm at different energy levels (from 0.1 to 2.5 kW·hr/t), is presented. The testing results appear as two parameters — A and b. The apparatus comprises the system of variable weight falling on rock specimens of various size from different height. Established parameters may be used in modeling and simulation with application of JKSimMet grinding cycle package, as well as combination of crushing, autogenous and semiautogenous grinding, classification and secondary grinding cycles. Crushing energy requirements may be estimated by falling weight test results, and energy consumption in autogenous and semi-autogenous grinding — by simulation data. Test results may be used in plants operation simulation for studies related to changes in ore types, classification equipment standard sizes, ore grain size distribution, ball charge, mesh size, application of pebble crushers, etc. Simulation may be applied in design of new circuits for checking different flow sheet configurations and equipment choice optimization. Falling weight test procedure requires 65 kg of material, to be subjected to special preparation in order to obtain from 30 to 90 lumps of five size fractions in narrow size range. Lump density is in the range of 2800–4000 kg/m³. Crushing energy change per particle is regulated over the range from 0.1 to 2.5 kW·hr/t through changes in weights' mass (from 20 to 50 kg) and their falling height (from 0.5 to 1.0 m). Examples of disintegration functions (occurrence) calculation are presented.

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