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Dissolution Kinetics of Sepiolite in Hydrochloric Acid And Nitric Acid

Published online by Cambridge University Press:  01 January 2024

Mİne Özdemİr  and
İlker Kipçak
Mİne Özdemİr*
Affiliation:
Department of Chemical Engineering, Engineering and Architectural Faculty, Osmangazi University, 26480-Batı Meşelik, Eskişehir, Turkey
İlker Kipçak
Affiliation:
Department of Chemical Engineering, Engineering and Architectural Faculty, Osmangazi University, 26480-Batı Meşelik, Eskişehir, Turkey
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The dissolution kinetics of sepiolite in hydrochloric acid and nitric acid were studied in a batch reactor. The effects of reaction temperature, acid concentration, particle size and solid-to-liquid ratio on the dissolution process were investigated. Experimental studies were carried out in the ranges of 25–75°C for reaction temperature, 0.25–1.00 mol/L for acid concentration, 0.00755–0.05020 cm for average particle size and 2.5 to 12.5 g of solid/100 mL of acid for solid-to-liquid ratio. It was determined that the dissolution process is controlled by resistance of the diffusion through the product layer. The activation energies of the process were determined to be 40.8 and 38.3 kJ/mol for hydrochloric and nitric acid, respectively. The apparent rate constants were expressed as a function of reaction temperature, acid concentration, particle radius and solid-to-liquid ratio: kαe−4910(1/T)Cr−0.6 (s/l)−1 and kαe−4606(1/T)Cr−0.5 (s/1)−1 for hydrochloric and nitric acid, respectively; k is the apparent rate constant in min−1; T, the reaction temperature (K); C, the acid concentration (mol/L); r, the initial particle radius (cm); s/l, the solid-to-liquid ratio (g of solid/100 mL of acid).

Keywords

Dissolution KineticsHydrochloric AcidNitric AcidSepiolite
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 6 , December 2004 , pp. 714 - 720
Copyright
Copyright © 2004, The Clay Minerals Society

References

Abdul-Latif, N. and Weaver, E.C., (1969) Kinetics of dissolution of palygorskite (attapulgite) and sepiolite Clays and Clay Minerals 17 169–178 10.1346/CCMN.1969.0170305.CrossRefGoogle Scholar
Aznar, A.J. Gutierrez, E. Diaz, D. Aluarez, A. and Poncolet, G., (1996) Silica from sepiolite: Preparation, textural properties and use as support to catalyst Microporous Materials 6 105–114 10.1016/0927-6513(95)00096-8.CrossRefGoogle Scholar
Balcı, S., (1996) Thermal decomposition of sepiolite and variations in pore structure with and without acid pretreatment Journal of Chemical Technology and Biotechnology 66 72–78 10.1002/(SICI)1097-4660(199605)66:1<72::AID-JCTB442>3.0.CO;2-T.3.0.CO;2-T>CrossRefGoogle Scholar
Bonilla, J.L. Lopez-Gonzalez, J.D. Ramirez-Saenz, A. Rodriguez-Reinoso, F. and Valenzuella-Calahorro, C., (1981) Activation of a sepiolite with dilute solutions of HNO3 and subsequent heat treatment: II. Determination of surface acid centers Clay Minerals 16 173–179 10.1180/claymin.1981.016.2.05.CrossRefGoogle Scholar
Brauner, K. and Preisinger, A., (1956) Struktur und entstahung des sepioliths Tschermaks Mineralogische und Petrographische Mitteilungen 6 120–140 10.1007/BF01128033.CrossRefGoogle Scholar
Çetişli, H. and Gedikbey, T., (1990) Dissolution kinetics of sepiolite from Eskişehir (Turkey) in hydrochloric and nitric acids Clay Minerals 25 207–215 10.1180/claymin.1990.025.2.06.CrossRefGoogle Scholar
Ceylan, H. and Sarıkaya, Y., (1989) The effect of HNO3 activation and heat treatment on the surface activity of sepiolite from Eskisehir in Turkey Doğa Türk Kimya Dergisi 13 130–137.Google Scholar
Corma, A. Perez-Pariente, J. Fornes, V. and Mifsud, A., (1984) Surface acidity and catalytic activity of a modified sepiolite Clay Minerals 19 673–676 10.1180/claymin.1984.019.4.14.CrossRefGoogle Scholar
Corma, A. Mifsud, A. and Perez, J., (1986) Etude cinetique de l’attaque deide de la sepiolite: Modifications des proprietes texturales Clay Minerals 31 69–84 10.1180/claymin.1986.021.1.06.CrossRefGoogle Scholar
Dekany, I. Turi, L. Fonseca, A. and Nagy, J.B., (1999) The structure of acid treated sepiolites: Small angle X-ray scattering and multi MS-NMR investigations Applied Clay Science 14 141–160 10.1016/S0169-1317(98)00056-8.CrossRefGoogle Scholar
Galán, E., (1996) Properties and applications of palygorskite-sepiolite clays Clay Minerals 31 443–453 10.1180/claymin.1996.031.4.01.CrossRefGoogle Scholar
Gonzalez-Hernandez, L. Ibarra-Ruoda, L. Rodriguez-Dias, A. and Chamorro-Anton, C., (1986) Preparation of amorphous silica by acid dissolution of sepiolite kinetics and textural study Journal of Colloid and Interface Science 109 150–160 10.1016/0021-9797(86)90290-0.CrossRefGoogle Scholar
Gülensoy, H., (1984) Kompleksometrinin Esasları ve Kompleksometrik Titrasyonlar Istanbul Fatih Yayınevi 259 pp.Google Scholar
Jimenez-Lopez, J. Lopez-Gonzalez, J.D. Ramirez-Saenz, A. Rodriguez-Reinoso, F. Valenzuela-Calahorro, C. and Zurita-Herre, L., (1978) Evaluation of surface area in a sepiolite as a function of acid and heat treatment Clay Minerals 13 375–385 10.1180/claymin.1978.013.4.03.CrossRefGoogle Scholar
Kara, M. Yüzer, H. Sabah, E. and Çelik, M.S., (2003) Adsorption of cobalt from aqueous solutions onto sepiolite Water Research 37 224–232 10.1016/S0043-1354(02)00265-8.CrossRefGoogle ScholarPubMed
Kıpçak, , (1999) Asidik ortamda sepiolitten magnezyumun çözündürülme reaksiyonunun kinetiğinin incelenmesi Eskişehir, Turkey Osmangazi University MS thesis.Google Scholar
Myriam, M. Suarez, M. and Marti-Pozos, J.M., (1998) Structural and textural modifications of palygorskite and sepiolite under acid treatment Clays and Clay Minerals 46 225–231 10.1346/CCMN.1998.0460301.CrossRefGoogle Scholar
Radojevic, M. Jovic, V. Karaulic, D. and Vitorovic, D., (2002) Study of sepiolite from Goles (Kosova, Yugoslavia). II Acid activation Journal of Serbian Chemical Society 67 499–506 10.2298/JSC0207499R.CrossRefGoogle Scholar
Rodriguez-Reinoso, F. Ramirez-Saenz, A. Lopez-Gonzalez, J.D. Valenzuella-Calahorro, C. and Zurita-Herrera, L., (1981) Activation of sepiolite with dilute solutions of HNO3 and subsequent heat treatment: III. Development of porosity Clay Minerals 16 315–323 10.1180/claymin.1981.016.4.01.CrossRefGoogle Scholar
Vicente, M.A. Suarez, M. Lopez-Gonzalez, J.D. and Banares-Munoz, M.A., (1996) Characterization, surface area and porosity analysis of the solids obtained by acid leaching of a saponite Langmuir 12 566–572 10.1021/la950501b.CrossRefGoogle Scholar
Wadsworth, M.E. Miller, J.D., Sohn, H.Y. and Wadsworth, M.E., (1979) Rate process of extractive metallurgy Hydrometallurgical Processes New York Plenum Press 133–199.Google Scholar
Yebra-Rodriguez, A. Martin-Ramos, J.D. Del Rey, F. Viseras, C. and Lopez-Galindo, A., (2003) Effect of acid treatment on the structure of sepiolite Clay Minerals 38 353–360 10.1180/0009855033830101.CrossRefGoogle Scholar