Crushing and grinding minerals deposits of the western area Nurkazgan

Abstract

The paper calculated the total surface energy of the mineral deposits Nurkazgan West, which is equal to: σ = 0,806 J/m2. The main contribution to the surface energy of the field West Nurkazgan minerals contribute quartz (SiO2) and corundum (Al2O3). Designed overall operation of the fragmentation of 1 ton of mineral deposits Nurkazgan to a piece of 5 mm, which is A = 3.014 J. This corresponds to a specific energy consumption E = 30.2 kW·h/t. It shows that to increase the efficiency of ore crushing need to increase the defects of the mineral structure, reduce the temperature and increase the power of crushing. Cooling is best in ore hopper using liquid cryogenic plants. It is shown that an abrupt change of work crushing and defects in the mineral structure can be achieved with the optimal use of energy in the blast ore production stage or electroimpulse crushing hopper. It is shown that the minimum value of the grain size is determined by the surface energy: mind → minσ2. This condition determines the efficiency of ore grinding. To increase it is necessary to decrease the surface energy minerals. It is shown that the most cost-effective mix before the process of crushing and grinding the ore Western and Northern regions Nurkazgan field.