Investigation of dissolution kinetics of natural magnesite in gluconic acid solutions

被引：0
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作者：
Bayrak, Bahar [1 ]
Laçin, Oral [2 ]
Bakan, Feray [1 ]
Saraç, Hanifi [1 ]
机构：
[1] Department of Chemical Engineering, Atatürk University, 25240 Erzurum, Turkey
[2] Atatürk Üniversitesi, Mühendislik Fakültesi Kimya Mühendisliǧi Bölümü, 25240 Erzurum, Turkey
来源：
Chemical Engineering Journal | 2006年 / 117卷 / 02期
关键词：
In this study; the dissolution of magnesite particles in aqueous gluconic acid solutions was investigated in a batch reactor employing the parameters of stirring speed; particle size; temperature; solid/liquid ratio and acid concentration. The shrinking core model was evaluated for the rate increased by decreasing particle size and increasing the temperature and initially; the dissolution in terms of acid concentration and then fell with the increasing concentration. No important effect of stirring speed was observed and the dissolution rate decreased as solid/liquid ratio increased. It was shown that the model is:-2.0 ln((1-XB)1/3+1.63)+1.0 ln((1-XB)2/3-1.63(1-XB)1/3+2.66)-3.47 arctan(0.58(1.23(1-XB)1/3-1))=3bkSCA0ρBRt Dissolution curves were evaluated in order to test shrinking core models for fluid-solid systems. Consequently; it was determined that the dissolution rate is controlled by surface chemical reaction. The activation energy of the process was determined to be 61.7 kJ mol-1. © 2006 Elsevier B.V. All rights reserved;
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页码：109 / 115
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