Khmil I. Features of the magnetite quartzite grinding technology in conditions of volume non uniform-component compression.

The thesis is the finished research work in which the actual scientific and practical task of the magnetite quartzite crushing in the conditions of volume non uniform component compression for disclosure of ore processing features of magnetite quartzite on Industrial corporate enterprise SEVGOK is solved which change will allow to improve of ores crushing process. It is proved that when crushing the magnetite quartzite in tube mills in the conditions of non uniform component compression of ore piece by contact forces there exist the energy saving mechanism of destruction which is realized due to existence of concentration of the maximum shift tensions which arise in the points of a piece cross-section located on its neutral axis which define concentration of the maximum normal tension in ore. The imitating kinetic model of polydisperse ore crushing, which unlike existing ones, on the simulating basis of the stochastic dynamic mill processes in the conditions of unevenly component compression of a ore piece by contact forces is improved. As entry conditions are used fractional streams of ready material, the set volume of mill loading, a control class of the crushed product, existence and properties of valuable components, an ore grindability that allows to estimate a disclosure coefficient of mineral joints at change of qualitative composition of ore charge and mill pulley lagging type. It is established that for the magnetite quartzite crushing in ball mills the it is necessary increase of shift tension concentration due to increase of relative speed of ball rotation owing to increase of a mill volume by 3-5 % because of replacement of mill space modification. It allows to increase a class - 0,056 mm rise on 17-29 % and to increase of ore grain disclosure on 1,8-3%, nonmetallic - on 1,3 % that increases final concentrate quality on 0,3 %. The idea of work consists in increase of shift tension concentration at which mineral disclosure happens mainly at achievement of tension value which induces in grains the shift tension equal to shear and tensile strength. Branch - rozrobka rodovisch korisnih copaline (tehnіchnі Science)/