Presentation on theme: "Performance of the centrifugal "X-Mill" Toshio Inoue."— Presentation transcript:
Performance of the centrifugal "X-Mill" Toshio Inoue
History of Centrifugal Mills ? Loyd et al. and Lurgi Hicom Mill Boys and Hoyer, MD Research, Aus. X-Mill
Hicom Mill (MD Research)
Possible Types of Mills for Fine to Very Fine Grinding High speed mechanical impact Use of fluid energy Use of grinding media
Mills using Grinding Media Tumbling mill Vibration mill Planetary mill Fluid energy (agitation) mill Centrifugal mill
Centrifugal Mill Scope of Investigation Machine design - Transfer from DEM simulation model to prototype machine Extensive simulation analysis Theoretical vs. simulation model analyses Verification by prototype X-Mill
Prototype design of the X-Mill
Specification of the Prototype X-Mill TypeBalanced twin cylindrical mill bodies OperationBatch or continuous Cylinder dia.150 mm Cylinder length300 mm Grinding mediaca. 17 kg * 2 (steel balls) Dimensional size762(W) * 935(H) * 1190(L) mm Motor7.5 kW 6 Poles
Result of Theoretical Model Analysis
Theoretical solution - 1 N.A.
Theoretical solution - 2 N.A.
Simulation Model Analysis Versatile Simulator ‘Mill Solver’ 2-D model For tumbling mill, centrifugal mill, vibration mill and planetary mill Visualize motion of balls and the center of gravity of ball charge Visualize energy dissipation maps in 2 camera angles Track mechanical effects and energy dissipation of individual collision events
Simulation Model Analysis Track energy dissipation on individual collision events by 6 components: - ball to ball radial component (bbr) - ball to ball tangential component (bbt) - ball to wall radial component (bwr) - ball to wall tangential component (bwt) - ball to liner bar radial component (blr) - ball to liner bar tangential component (blt) Record data for later (e.g. statistic) analysis
Ref. : 1 m tumbling mill
Autogenous Comminution of Limestone
Potentiality of the X-Mill High stress intensity Simple machine structure Compact size and low installation cost Little vibration and easy installation Competitive enough grinding efficiency
Applicable to both dry and wet grinding operations Suitable for fine to very fine grinding Easy maintenance Reasonable consumption of liner and grinding media Reasonable noise level Frequent but easy maintenance of liner bars/plates Heat dispersion - water jacket?