Hostname: page-component-7c8c6479df-24hb2 Total loading time: 0 Render date: 2024-03-19T08:54:07.076Z Has data issue: false hasContentIssue false

Comments on the characterization of untreated and ground kaolin from Ranong, Thailand

Published online by Cambridge University Press:  02 January 2018

Bernard A. Goodman*
Affiliation:
College of Physical Science & Engineering, and State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004 Guangxi, China
Niramon Worasith
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Rajamangala University of Technology Krungthep, 2 Nang Lin Chi Road, Soi Suan Plu, Sathorn, Bangkok, Thailand

Abstract

Aung et al. (2014, 2015) described the activation of kaolin samples to remove coloured pigments from rice-bran oil, the effects of various treatments on their decolourization capacity, and the characterization of these kaolin samples by physical methods. This research used a kaolin sample from Ranong in southern Thailand, and investigated the effects of grinding and heat treatment prior to acid activation of the mineral. The various activated mineral phases were then characterized by a combination of X-ray diffraction, Fourier-Transform infrared spectroscopy and X-ray fluorescence. This work represented an extension of research reported previously by Worasith et al. (2011a), in which various samples of the same Ranong kaolin were characterized after grinding and acid activation, and their capacities to decolourize rice-bran oil evaluated (Worasith et al., 2011b). However, despite the similarities in the experiments, there are some important differences in the results presented in these two sets of publications, which raise questions concerning the conduct of this type of research and the generality of any conclusions derived.

Type
Short Note
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Aglietti, E.F., Porto Lopez, J.M. & Pereira, E. (1986) Mechanochemical effects in kaolinite grinding. II. Structural aspects. International Journal of Mineral Processing, 16, 135146.CrossRefGoogle Scholar
Anwar, F., Anwer, T. & Mahmood, Z. (2005) Methodical characterization of rice (Oryza sativa) bran oil from Pakistan. Grasas y Aceites, 56, 125134.Google Scholar
Aung, L.L., Tertre, E., Worasith, N., Suksabye, P. & Thiravetyan, P. (2014) The capacity of activated kaolins to remove colour pigments from rice bran oil: the effects of acid concentration and pre-heating prior to activation. Clay Minerals, 49, 513526.CrossRefGoogle Scholar
Aung, L.L., Tertre, E., Suksabye, P., Worasith, N. & Thiravetyan, P. (2015) Effect of alumina content and surface area of acid-activated kaolin on bleaching of rice bran oil. Journal of the American Oil Chemist’ Society, 92, 295304.Google Scholar
Churchman, G.J., Whitton, J.S., Claridge, G.G.C. & Theng, B.K.G. (1984) Intercalation method using formamide for differentiating halloysite from kaolinite. Clays and Clay Minerals, 32, 241248.Google Scholar
Frost, R.L., Makó, É., Kristof, I., Horváth, E. & Kloprogge, J.T. (2001a) Mechanochemical treatment of kaolinite. Journal of Colloid and Interface Science, 239, 458166.CrossRefGoogle ScholarPubMed
Frost, R.L., Makó, É., Kristof, I., Horváth, E. & Kloprogge, J.T. (2001b) Modification of kaolinite surfaces by mechano-chemical treatment. Langmuir, 17, 4731738.Google Scholar
Frost, R.L., Horváth, E., Makó, É., Kristof, I. (2004) Modification of low- and high-defect kaolinite surfaces: implications for kaolinite mineral processing. Journal of Colloid and Interface Science, 270, 337346.CrossRefGoogle ScholarPubMed
Lombardi, G., Russell, J.D. & Keller, W.D. (1987) Compositional and structural variations in the size fractions of a sedimentary and a hydrothermal kaolin. Clays and Clay Minerals, 35, 321335.Google Scholar
Makó, É., Frost, R.L., Kristof, I. & Horváth, E. (2001) The effect of quartz content on the mechanochemical activation of kaolinite. Journal of Colloid and Interface Science, 244, 359364.CrossRefGoogle Scholar
Mitrovic, A. & Zdujic, M. (2013) Mechanochemical treatment of Serbian kaolin clay to obtain a highly reactive pozzolana. Journal of the Serbian Chemical Society, 78, 579590.Google Scholar
Nuntiya, A. & Prasanphan, S. (2006) The rheological behavior of kaolin suspensions. Chiang Mai Journal of Science, 33, 271281.Google Scholar
Reynolds, R.C. & Bish, D.L. (2002) The effects of grinding on the structure of a low-defect kaolinite. American Mineralogist, 87, 16261630.Google Scholar
Sayre, R.N., Nayyar, D.K. & Saunders, R.M. (1985) Extraction and refining of edible oil from extrusion-stabilized rice bran. Journal of the American Oil Chemists’ Society, 62, 10401043.Google Scholar
Velde, B. (1995) Origin and Mineralogy of Clays: Clay and the Environment. Springer-Verlag, New York.CrossRefGoogle Scholar
Worasith, N., Goodman, B.A., Neampan, J., Jeyachoke, N. & Thiravetyan, P. (20 11a) Characterisation of modified kaolin from the Ranong deposit Thailand by XRD, XRF, SEM, FTIR and EPR techniques. Clay Minerals, 46, 525545.Google Scholar
Worasith, N., Goodman, B.A., Jeyachoke, N. & Thiravetyan, P. (2011b) Decolorization of rice bran oil using modified kaolin. Journal of the American Oil Chemists’ Society, 88, 20052014.CrossRefGoogle Scholar