Acidic dissolution of hematite: Kinetic and thermodynamic investigations with oxalic acid

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• 作者：Riina Salmimies^a ; ^{riina.salmimies@lut.fi} ; Marju Mannila^a ; Juha Kallas^b ; Antti Hä ; kkinen^a
• 关键词：Dissolution ; Hematite ; Oxalic acid ; Kinetic modeling
• 刊名：International Journal of Mineral Processing
• 出版年：2012
• 期刊代码：43_03017516
• 类别：ce
• 出版时间：18 July, 2012
• 卷：110-111
• 期：Complete
• 页码：121-125
• 文件大小：506 K

摘要

Although extensively studied, consensus on the kinetics or thermodynamics of iron oxide dissolution has not yet been achieved among scientists. The aim of this study was to investigate the applicability of twelve different kinetic models in describing the dissolution of hematite (伪-Fe₂O₃). In this study, hematite was dissolved in 0.6 mol/L oxalic acid at 50 掳C to obtain kinetic data for modeling. In addition to the kinetic data, thermodynamic data were collected at 35 and 50 掳C to discuss the dissolution mechanism. The Kabai equation and the first order rate law were found most suitable in describing the dissolution. The associated reaction rate constants were 2.0路10^鈭?#xA0;5 s^鈭?#xA0;1 for both models.