Optimization Design Of SAG Mill Lining Structure Base On Statistical Mechanics Method

Semi-autogenous mill is one of the most widely crushing equipment be used in mining areas. The main problems focus on the reasonable lectotyp of semi-autogenous mill lining.Therefore, the crux is to find out the relationship of the lining structure parameters and semi-autogenous mill grinding performance, and put forward optimization scheme for lining structure design.The following work have been finished by combining theory research, simulation and test method: Analyse the law of semi-autogenous mill lining structure parameters acting on the particles motility pattern base on statistical mechanics method. Use dynamic analysis to establish to the semi-autogenous mill useful power mathematical model by taking lining structure parameter as a variable. According to the model analysis, come up the trend and optimization area of semi-autogenous mill lining structure parameters on the grinding performance. The reliability of the model have been validated by computer simulation and grinding experiment. The following results are obtained based on the above study.(1) Analyse the motion trajectory and motion state of internal particles at the different position level inside semi-autogenous mill, discover that particles motion law is similar if they be in the similar position level. For this reason, the internal particles distribution area division rule have been deduced by this rule. And SAG internal particles area have divided as four distribution parts: ascending zone, dead zone, cataract zone and drop zone.(2) Establish to the SAG mill useful power mathematical model base on dynamic analysis of internal particles in each area. Select the useful power and mechanical efficiency of the model as evaluation index. Point out the influence trend of crushing effect and crushing efficiency with SAG mill lining shape and structure parameters at the mathematical analysis aspect. Obtain the scope of lining structure parameters optimization.(3) With the visualization simulation experiment in the EDEM, estimate the number of the internal drop particles, regional distribution and the broken bonded number of particles(material). Obtain the changing trend of grinding performance and optimize range of SAG mill lining structure parameters. And this conclusion accorded with the model analysis.Prove the reliability of the model which was applied to SAG mill lining structure parameters optimization in the simulation.(4) Choose the -1mm size product yield and energy consumption than broken quality as evaluation index in grinding experiment. With the change of SAG mill lining structure parameters, obtain the changing trend of grinding performance and energy conversion efficiency, and optimize combination of lining structure parameters. This conclusion is consistent with the analysis of model and simulation. Validate the reliability of the SAG mill useful power mathematical model.Through the above show that the research will provide theoretical reference for SAG mill lining structure optimization design. It has a good significance for theoretical study and practical application value in increase consumption and improve the grinding performance of SAG mill.