Effect of NaOH on aragonite precipitation in batch and continuous crystallization in causticizing reaction

被引：26
作者：
Konno, H
Nanri, Y
Kitamura, M
机构：
[1] Nippon Paper Ind Co Ltd, R&D Div, Pulp & Paper Res Lab, Kita Ku, Tokyo 1140002, Japan
[2] Hiroshima Univ, Dept Chem Engn, Higashihiroshima 7398527, Japan
来源：
POWDER TECHNOLOGY | 2003年 / 129卷 / 1-3期
关键词：
crystallization; aragonite; causticizing reaction; continuous operation; batch operation; supersaturation;
D O I：
10.1016/S0032-5910(02)00275-9
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
In order to obtain CaCO3 crystals with high aragonite content in the causticizing reaction in the paper industry, the effect of the NaOH addition at various temperatures was investigated using a batch operation. It is apparent that the NaOH addition increased aragonite composition in the crystal at all temperatures investigated. Then, aragonite crystallization was investigated using a continuous operation. In the continuous operation, it appeared that the dominant factor for the aragonite formation is the low molar ratio of Na2CO3 to Ca(OH)(2). The lower supersaturation and the higher ratio of [Ca2+]/[CO32-] in the presence of NaOH are advantageous to precipitate aragonite in the causticizing reaction. (C) 2003 Elsevier Science B.V. All rights reserved.
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页码：15 / 21
页数：7
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