The Kinetics of Dissolution of Colemanite in H3PO4 Solutions

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• 作者：Hakan Temur ; Ahmet Yarta//pubs.acs.org/images/entities/scedil.gif" border="0">i ; Mehmet &Ccedil ; opur ; and M. Muhtar Kocakerim
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：November 2000
• 年：2000
• 卷：39
• 期：11
• 页码：4114 - 4119
• 全文大小：88K
• 年卷期：v.39,no.11(November 2000)
• ISSN：1520-5045

文摘

The dissolution kinetics of colemanite in phosphoric acid solutions was studied. The effects ofparticle size, temperature, acid concentration, solid-to-liquid ratio, and stirring speed on thedissolution rate were determined. It was observed that the dissolution rate increased withdecreasing particle size and solid-to-liquid ratio and with increasing temperature, but stirringspeed had no effect on it. The dissolution rate increased up to an acid concentration of 19.52%(by wt) and then decreased with increasing acid concentration. The dissolution kinetics ofcolemanite were examined according to the heterogeneous and homogeneous reaction modelsfor the acid concentration range of 1.43-19.52% (by wt) of acid concentration, and it was foundthat the dissolution rate was controlled by surface chemical reaction. The activation energy ofthis process was determined to be 53.91 kJ mol^-1.