<論文>Work Index相当数による石灰石の微粉砕性評価

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Comminution is the oldest mechanical unit operation for size reduction ofsolid materials and an important step in many processes where raw materialsare converted into intermediate or final products. Limestone is self-sufficientmineral resource in Japan and has been using as a sample for grinding tests.Recently, a demand for fine or ultra-fine particles is increasing in manykinds of industries.The energy efficiency of comminution is very low and the energy requiredfor comminution increases with a decrease in feed or produced particle size.Research and development to find energy-saving comminution processes havebeen performed. Then, it is necessary to estimate the comminution energy.Bond had proposed Work Index and it is an important factor in designing comminutionprocesses and has been widely used. The measurement procedure ofWork Index is closely defined by JIS. In a previous paper, the authors proposeda corresponding Work Index which is proportional to the Work Index.A corresponding Work Index could be estimated by the examination of the zeroorderincreasing rate constant of mass fraction less than a evaluating sizeusing an arbitrary ball mill.In this paper, ball mill, vibration mill and planetary mill grinding, compressivecrushing of powder bed, and autogenous grinding with a stirred millwere carried out on limestone. The relationships between the correspondingWork Index and the evaluating size (sieving size) were studied.As a result, the corresponding Work Index had the minimum value whenthe evaluating size was approximately the grain size of limestone in the fivekinds of mills.
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<論文>Work Index相当数による石灰石の微粉砕性評価

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