Study of the dehydroxylation of kaolinite and alunite from a Mexican clay with DRIFTS-MS
Por:
Osornio-Rubio, N. R., Torres-Ochoa, J. A., Palma-Tirado, M. L., Jimenez-Islas, H., Rosas-Cedillo, R., Fierro-Gonzalez, J. C., Martinez-Gonzalez, G. M.
Publicada:
1 mar 2016
Categoría:
Geochemistry and Petrology
Resumen:
Few reports exist on the use of Diffuse Reflectance Infrared Fourier Transform Spectrometry coupled with Mass Spectrometry (DRIFTS-MS) in situ to monitor the dehydroxylation of kaolinitic clays. The use of DRIFTS-MS in situ allows study of the effect of heat treatment on the dehydroxylation, identifying intensities and temperatures at which the hydroxyl groups are released, forming metakaolinite and meta-alunite. The effluent gases from the infrared cell were analysed by mass spectrometry. The decrease in intensity of the bands at 3694, 3669, 3650 and 3621 cm-1 associated with the-OH stretching vibration modes of AlVI-OH-AlVI of kaolinite began at 450°C. Two additional bands at 3513 and 3485 cm-1 are associated with the vibration of AlVI-OH of alunite that also began to disappear during thermal treatment. Monitoring of the fractions m/e 17 and 18 using a mass spectrometer revealed that the intensity of these fractions increased starting at 450°C. Therefore, it is possible to study the dehydroxylation process of clays during thermal treatment.Chemical and mineralogical characterization of a kaolinitic clay (KN) from Mexico showed that the clay consists of 64.8% kaolinite, 11.0% alunite and 24.4% quartz based on PXRD, EDS, TG/DTA, TEM and FTIR results, and suggested that the material might have potential for use in the manufacture of ceramics, refractory bricks or geopolymers. © 2016 by Walter de Gruyter Berlin/Boston.
Filiaciones:
Osornio-Rubio, N. R.:
Inst Tecnol Celaya, Dept Ingn Quim, Av Tecnol & A Garcia Cubas S-N, Celaya 38010, Gto, Mexico
Torres-Ochoa, J. A.:
CINVESTAV, Unidad Queretaro, Libramiento Norponiente 2000, Queretaro 76230, Mexico
Palma-Tirado, M. L.:
UNAM Juriquilla, Unidad Microscopia INB, Blvd Juriquilla 3001, Queretaro 76230, Mexico
Jimenez-Islas, H.:
Inst Tecnol Celaya, Dept Ingn Bioquim, Av Tecnol & A Garcia Cubas S-N, Celaya 38010, Gto, Mexico
Inst Tecnol Celaya, Ciencias Ingn, Av Tecnol & A Garcia Cubas S-N, Celaya 38010, Gto, Mexico
Rosas-Cedillo, R.:
Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Av San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
Fierro-Gonzalez, J. C.:
Inst Tecnol Celaya, Dept Ingn Quim, Av Tecnol & A Garcia Cubas S-N, Celaya 38010, Gto, Mexico
Martinez-Gonzalez, G. M.:
Inst Tecnol Celaya, Dept Ingn Quim, Av Tecnol & A Garcia Cubas S-N, Celaya 38010, Gto, Mexico
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