Prediction of Attrited and Fragmented Crystal Size by Micro-hardness Parameters in Suspension-crystallization Processes

DOI Web Site 30 References
  • Asakuma Yusuke
    Department of Mechanical and Systems Engineering, University of Hyogo
  • Terashima Tomonobu
    Department of Mechanical and Systems Engineering, University of Hyogo
  • Honda Takahiro
    Department of Mechanical and Systems Engineering, University of Hyogo
  • Maeda Kouji
    Department of Mechanical and Systems Engineering, University of Hyogo
  • Miki Hideo
    Crystal Engineering Corporation
  • Fukui Keisuke
    Department of Mechanical and Systems Engineering, University of Hyogo

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  • ＭＳＭＰＲ晶析槽内での微小硬度評価による磨耗，断片化粒子サイズの予測
  • MSMPR晶析槽内での微小硬度評価による摩耗,断片化粒子サイズの予測
  • MSMPRショウセキソウ ナイ デ ノ ビショウ コウド ヒョウカ ニ ヨル マモウ ダンペンカ リュウシ サイズ ノ ヨソク

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Abstract

In chemical engineering processes in which solids are produced, the strength of the substances plays a key role for contact nucleation. In this study, micro-level measurements of the fracture strength of K2SO4 crystals were performed under various operating conditions of an MSMPR (mixed suspension and mixed product removal) crystallizer. The degree of attrition and fragmentation behavior was predicted from the fracture strength, the fracture energy, the roundness of the crystal, and the attrition coefficient calculated from micro-hardness properties. The results showed that these properties had different values for each operating condition, and that the minimum and maximum size of the crystal fragmented by attrition could be predicted by means of the attrition coefficient. By evaluating parameters based on micro-hardness, we demonstrated that the stirring speed and the crystal size were the most important of the various operation conditions in the attrition process.

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