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Published byGuy Skeens Modified about 1 year ago

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Performance of the centrifugal "X-Mill" Toshio Inoue

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History of Centrifugal Mills 1970 - 1980 ? Loyd et al. and Lurgi 1980 - Hicom Mill Boys and Hoyer, MD Research, Aus. X-Mill

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Hicom Mill (MD Research)

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Possible Types of Mills for Fine to Very Fine Grinding High speed mechanical impact Use of fluid energy Use of grinding media

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Mills using Grinding Media Tumbling mill Vibration mill Planetary mill Fluid energy (agitation) mill Centrifugal mill

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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

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Prototype design of the X-Mill

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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

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Theoretical Model

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Result of Theoretical Model Analysis

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Theoretical solution - 1 N.A.

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Theoretical solution - 2 N.A.

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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

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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

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Ref. : 1 m tumbling mill

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Grinding efficiency

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Autogenous Comminution of Limestone

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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

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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?

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