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INTENSIFICATION OF BOND BALL MILL WORK INDEX TEST THROUGH VARIOUS METHODS
Abstract
The paper presents comparative studies aimed at reducing labor costs of Bond Ball Mill Work Index test (BWi) by using a number of alternative techniques. Methods of Ahmadi and Shahsavari, Berry and Bruse, Gharehgheshlagh, Horst and Bassarear, Kapur, Magdalinovich, a standard Bond test with feed sizing into limited size grades, and a standard Bond test with grain size analysis of subsamples of milled product were compared. Magdalinovich-Ahmadi and Kapur testing techniques were modified. The modified Magdalinovich-Ahmadi and Kapur techniques require no more than two cycles of ball grinding to determine BWi (while normally 6-8 cycles are required) and 4-5 kg of initial feed. The relative error in determining BWi by using the modified Magdalinovich-Ahmadi and Kapur techniques for apatite-nepheline ore is less than 3.6 % and 1.6% accordingly. The suggested modified Magdalinovich-Ahmadi and Kapur techniques allow to reduce labor and BWi test costs considerably, which makes them useful for mass sampling of deposits and monitoring physical and mechanical properties of ores entering a beneficiation plant.
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References12
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