Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-23T04:22:10.743Z Has data issue: false hasContentIssue false
  • English
  • Français

The 1640 cm-1 infrared band, monitor for the gain and thermal stability of water produced in ground kaolinites

Published online by Cambridge University Press:  09 July 2018

E. Mendelovici ,
R. Villalba ,
A. Sagarzazu  and
O. Carias
E. Mendelovici
Affiliation:
Laboratory of Physico-Chemistry of Materials, IVIC, Apartado 21827, Caracas 1020A, Venezuela
R. Villalba
Affiliation:
Laboratory of Physico-Chemistry of Materials, IVIC, Apartado 21827, Caracas 1020A, Venezuela
A. Sagarzazu
Affiliation:
Laboratory of Physico-Chemistry of Materials, IVIC, Apartado 21827, Caracas 1020A, Venezuela
O. Carias
Affiliation:
Laboratory of Physico-Chemistry of Materials, IVIC, Apartado 21827, Caracas 1020A, Venezuela
Get access Rights & Permissions [Opens in a new window]

Abstract

The development of the infrared (IR) absorption band at 1640 cm−1 (δH2O) is employed to monitor the gain in molecular water of progressively mortar-ground kaolinite. The planimetred area of this band shows a linear correlation with weight loss at 105°C (free moisture) between 2 and 18 h grinding, indicating a steady increase of molecular water in this range. Heating of ground products to 105°C causes a decrease of about ⅓ in the 1640 cm−1 peak area for all ground samples. This area decrease corresponds to a 34% (average) loss of free moisture as determined by gravimetry. The remaining water is held up to 280°C and is more tightly held in the kaolinite ground for shorter (2–5 h) intervals than in further ground kaolinites. The 1640 cm−1 peak is not detected in any ground kaolinite after heating to 600°C the temperature at which kaolinite dehydroxylates completely. The differentiation of the energetically different OH groups present in ground kaolinite and the mechanism of water gain are compared and discussed from IR spectroscopy and weight loss results.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 4 , December 1995 , pp. 307 - 313
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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

Dragsdorfr, D., Kissinger, H.E. & Perkins, A.T. (1951) An X-ray study of the decomposition of kaolinite. Soil Sci. 71, 439–448.Google Scholar
Gonzalez, G.F., Ruzz, A.M.T. & Gonzalez, R.M. (1991) Effects of dry grinding on two kaolins of different degrees of crystallinity. Clay Miner. 26, 549–565.Google Scholar
Hlavay, J., Jonas, K., ELEK S, & Inczedy, J. (1977) Characterization of the particle size and the crystallinity of certain minerals by infrared spectrophotometry and other instrumental methods - I. Investigations on clay minerals. Clays Clay Miner. 25, 451–456.Google Scholar
Kelley, W.P., Jenny, H. & Brown, S.M. (1936) Hydration of minerals and soil colloids in relation to crystal structure. Soil Sci. 41, 367–382.Google Scholar
Laws, W.D. & Page, J.B. (1946) Changes produced in kaolinite by grinding. Soil Sci. 62, 319–336.CrossRefGoogle Scholar
Mendelovici, E. & Sagarzazu, A. (1994) Prototropy in ground kaolinite explained as a mechanochemical reaction. Int. J. Mechanochemistry Mechanical Alloying (in press).Google Scholar
Mendelovici, E., Villalba, R. & Sagarzazu, A. (1983) Selective destruction and differentiation of clay minerals from natural diaspore admixture by mortar grinding. Int. J. Miner. Processing, 11, 131–138.Google Scholar
Miller, J.G. & Oulton, T.D. (1970) Prototropy in kaolinite during percussive grinding. Clays Clay Miner. 18, 313–323.Google Scholar
Perkins, A.T., Dragsdorf, R.D., Lippincotf, E.R., Selby, J. & Fateley, W.G. (1955) Products of clay mineral decomposition as related to phosphate fixation. Soil Sci. 80, 109–120.Google Scholar
Takahashi, H. (1959) Effects of dry grinding on kaolin minerals. I. Kaolinite. Bull. Chem. Soc. Japan, 32, 235–245.Google Scholar
Yariv, S. (1975) Infrared study of grinding kaolinite with alkali metal chlorides. Powder Technology, 12, 131–138.Google Scholar