Brief Description ball mill grinding mill flow principle 1, feeding method, the material is the first to enter the innermost trajectory, and only rely on centrifugal force and the material constantly fed circular motion of the material in the grinding gap gradually to the sport outer trajectory, in the end mill run some distance before movement into the outer track. 2, the trajectory of the ball is the inner layer, grinding smaller role, dressing mill, coarse particles can not be effectively broken, it enriched a lot of coarse particles. In cross section mill, the material from the grinding capacity at the weakest to the strongest movement, coarse material is difficult to move to the grinding capacity of the strongest outer material distribution is unreasonable, mill manufacturers, is not conducive to wear machine grinding ability to play. 3, coarse grinding mill warehouse deafening sound on the other hand also shows that the outer layer of the strongest in the grinding lack of cushioning material, producing a large void between collisions resulting in grinding and grinding bodies and linings, consumption a lot of kinetic energy, ball mill price, converted into sound energy and heat dissipated to do is exercise in futility. Coarse grinding of materials in the warehouse track gradually moved from the inner track outwardly process, once close to the outer tracks have simplified certain material, the material in the track is more than sufficient to enable the mill sports out of balance, resulting in "full mill" took place . Flotation machine within multiphase flow characteristics and dynamics of large-scale mechanical flotation machine with a strong beneficiation processing capability, low power consumption per unit volume, etc., used in mineral processing industry more widely. Currently, large-scale flotation machine generally by reference to the mechanical structure of a small flotation machine is designed in accordance with the scaling relations, it has not yet been refined design from the internal flow field level, basically still in the empirical design stage. l, based on the structural characteristics of multiphase flow field characteristics and flotation process mechanical flotation machine inside, ignoring the impact of the foam layer flow structure, internal flow area of ??the flotation machine has been simplified, the well will it is divided into pulp · air mixing zone, mineralization bubble transport and non-purpose mineral particles settling separation zone three regions; 2, based on the basic theory of multiphase flow and flow characteristics of pulp a bubble, ignoring flotation reagents for pulp and the role of the bubble, large mechanical flotation machine inside multiphase flow depth research, the use Mixture multiphase flow model and RNG ke turbulence model for the flow field inside the flotation machine described by a small float Analytical and experimental analysis of the flow field sorting machine demonstrates the feasibility of this flow model of mechanical flotation machine Flowfield; 3, using the above model and method using FLUENT software JFC-150 flotation machines 8 different impeller speed, internal flotation machine flotation inflation pressure of 9 different case _ multiphase flow into the line of flow field numerical simulation and analysis. 4, the pulse concentration of thought and residence time distribution based on mathematical models, based on the steady-state flow field, two-step, pulse tracer movement in the flotation machine was unsteady flow calculation, Beijing ball established within the flotation pulp residence time distribution prediction method, and the effect of impeller speed on the pulp residence time: 5, through the internal flow field analysis and simulation repeatedly proposed JFC-150 flotation machine structure parameters improvement programs to achieve energy saving flotation machine, improve product yield and quality, and further verify the validity and reliability of the calculation model. _ North mine mill prices Zhongcheng (Online) _ Beijing Ball from Shenyang North Mine Zhongcheng machinery Limited. Shenyang North Mine Zhongcheng equipment Limited (sybkzc.com) (www.sybkzcjq.com) Liaoning Shenyang, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In North mine public into leadership with the staff warmly welcome all inquiries negotiations to create the North mine public into a better future.