Research On Grinding Mechanism And Dynamic Simulation Analysis Of Vertical Spiral Agitating Mill

With high-grade and easy-selection ores resources to large-scale mined to make the simple and easy-selection of mineral resources were facing increasing shortages; rich reserves of lean, fine, miscellaneous low-grade refractory ore resources development and utilization rate increased year by year. Compared to easy dressing, the difficult beneficiation of sorting difficulties and low energy utilization was an indisputable fact. Vertical spiral agitating mill machine as a kind of high-efficiency and energy-saving of ultra-fine grinding equipment, for the difficult beneficiation of fine grained disseminated can effectively grinding, regrinding and beneficiation. Although Vertical spiral agitating mill has been widely used in metal and non-metal grinding work, but about tower mill cylinder body ore material movement, the speed of the cylinder body mineral aggregate and the pressure change and spiral mixer in the grinding force in the process of research during grinding operation mode are relatively few. Based on the grinding principle of vertical spiral agitating mill machine, through the analysis of its working principle completed the following several aspects work:(1) Detailed analysis and research of vertical spiral agitating mill machine working principle of grinding for grinding process ore material movement and two circular motion analyzed; Introduced two tower mill grinding mechanism in the process of grinding: grinding mechanism of friction and impact grinding mechanism; Finally, analysis of the working principle of grinding when grinding mineral aggregate operations in two laminar motion: centrifugal sedimentation and gravity sedimentation.(2) The relationship between the reference inertial and non-inertial coordinate system coordinates, the relationship between the use of inertia cylindrical coordinates noninertial reference frame was deduced, set up the tower mill rotating fluid dynamics modeling fluid domain; then from the Angle of the micro analysis of mineral aggregate particles movement way.(3) Accorded to ore material in the cylinder position relationship when the vertical spiral agitating mill grinding to tower mill’s fluid-domain 3D overall modeling. Combined with ANSYS FLUENT software for the fluid-domain grinding fluid simulation in the commissioning, using simulation results validate the tower mill fluid domain modeling correctness, and for the rest of the vertical spiral agitating mill machine provides a model on the basis of the iron concentrate of FLUENT simulation.(4) In the tower mill modeling fluid domain are correct premise, the article used ANSYS-FLUENT software for fluid simulation of vertical spiral agitating mill iron ore grinding. Through the cylinder body fluid domain movement, two-phase material is provided(iron ore concentrate and water), interface surface binding and appropriate iteration steps settings and so on for tower mill fluid-simulation experiments, simulation results of velocity contours and pressure contours to analyze the status of movement during grinding mill tower; combined with the mill tower fluid-domain’s FLUENT simulation for making use of ANSYS-Workbench to single-phase fluid-solid coupling analysis of spiral mixer, the simulation of the change of the stress and the deformation of helical blade when spiral mixer in grinding. And then the simulation results provides an important basis to the tower mill spiral agitator design; while made modal analysis of the spiral mixer to simulate spiral mixer first eight-order modal shape figure.