ISPEC 10th INTERNATIONAL CONFERENCE ON ENGINEERING & NATURAL SCIENCES, Siirt, Turkey, 16 - 18 May 2021, pp.2-7
In the field of mineral processing, the grinding process has great importance. This process is the last step of the size reduction, which is classified into wet or dry depending on the flow of the process and the state of the ore. The efficiency of the size reduction is influenced by several parameters such as mill type and speed, ball size, filling rate, feed size distribution, materials hardness and the method of grinding (wet or dry).
In this study, experimental data for hand-picked ulexite samples under dry grinding are characterized by particle size distribution functions. The kinetics of batch dry grinding of ulexite from the feeds of sieve sizes chosen as -3350+2360 μm, -2360+1700 μm, -800+600 μm, -600+425 µm, using a standard Bond mill. The standard Specific Rate of Breakage Function (Si) and Breakage Distribution Function (Bij) values for ulexite were determined by a laboratory size steel ball mill of 205 mm in diameter. The results indicated that ulexite followed the first-order kinetics of grinding. The breakage parameters for ulexite obtained from the grinding tests were found as Si=0.286 min-1, g= 0.78, β=4.49, Φ=0.70. Si values of ulexite increase with increasing feed size fractions. Additionally, the slowing down effect for ulexite was calculated as 6 min.
Keywords: Spesific Rate of Breakage Function, Breakage Distribution Function, Ulexite