Abstract
Some problems in the preparation process of highly loaded Coal-Water Mixtures(CWM) were discussed. The optimization of particle size distribution based on the two-stage pulverizing process was examined to attain stability in storage and fluidity in transport. The optimum particle size distribution obtained in this work was difficult to realize by using the actual pulverizer. Therefore, a possibility of a semi-optimum particle size distribution was sought in consideration of the experimental results of viscosity measurements of highly loaded CWM. A thixotropy model, in which the yield stress was adopted as a structural parameter, was proposed in connection with the stability problem of CWM storage. The model was able to explain well the buildup and breakdown processes of network structure in CWM. It was shown that the yield stress at the final stage of network structure buildup could be adopted as the index for the evaluation of stability in CWM storage.
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Schedule a callMore From: Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)
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