A Study on Modeling and Control of Salt Crystallization under High Suspension Density Conditions

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  • Takiyama Hiroshi
    Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Technology

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  • 高懸濁条件下の食塩晶析のモデル化および制御に関する研究
  • コウケンダク ジョウケン カ ノ ショクエンショウセキ ノ モデルカ オヨビ セイギョ ニ カンスル ケンキュウ

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Industrial crystallization should be carried out under high suspension conditions in order to obtain salt products efficiently. However, under such conditions, the nucleation rate becomes high. Therefore, it is necessary to make a model of fine crystal generation and to control the excess number of fine crystals. This study focused on the characteristics of fine crystals generated under high suspension conditions and on the dissolution phenomena by modulated (undersaturation) operation. Undersaturation condition was carried out by injecting of dissolution water. As results, the following conclusions were obtained. (1) The fine crystals could be classified into two types according to the shape of the fine crystals. The effects of the injection of dissolution water were different depending on the shape of the fine crystals. (2) The dissolution water was effective for the preferential dissolution of the fine crystals and modification of the crystal surfaces directly related to the fine crystal generation. (3) Control strategies with local under saturation were proposed in order to control fine crystal generation.

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