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Low-Temperature Alteration of Palygorskite To Smectite

Published online by Cambridge University Press:  02 April 2024

D. C. Golden  and
J. B. Dixon
D. C. Golden*
Affiliation:
Department of Soil & Crop Sciences, Texas A&M University, College Station, Texas 77843
J. B. Dixon
Affiliation:
Department of Soil & Crop Sciences, Texas A&M University, College Station, Texas 77843
*
1Current address: Fertilizer & Lime Research Center, Department of Soil Science, Massey University, Palmerston North, New Zealand
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Abstract

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The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22° to 160°C was investigated in a series of laboratory experiments, in which alkalinity was maintained in the pH range of 11.4 to 12 by adding NaOH. The smectite formed was characterized by chemical, spectroscopic, and electron microscopic techniques. Smectite formed rapidly at > 100°C; the transformation was slow, however, at 22°C. The introduction of MgCO3 accelerated the alteration process, but changes in alkalinity at pH > 12 and the difference in elemental composition of the palygorskite samples did not significantly affect the alteration. A pressure of one atmosphere and a temperature of 22°C were sufficient for some transformation to occur within a few months, provided the alkalinity was maintained close to pH 12. X-ray powder diffraction characterization of the product indicated a smectite, and infrared spectroscopy indicated saponite. The alteration to smectite was appreciable even at room temperature, which suggests that the reaction can take place without any external heating.

Keywords

Alkaline solutionHydrothermal transformationPalygorskiteSmectiteX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 4 , August 1990 , pp. 401 - 408
Copyright
Copyright © 1990, The Clay Minerals Society

References

Bernas, B., 1968 A new method for decomposition and comprehensive analysis of silicates by atomic absorption spectrometry Anal. Chem. 40 1682 – 1686.CrossRefGoogle Scholar
Bigham, J. M., Jaynes, W. F. and Allen, B. L., 1980 Pedogenic degradation of sepiolite and palygorskite on the Texas High Plains Soil Sci. Soc. Amer. J. 44 159 – 167.CrossRefGoogle Scholar
Elprince, A. M., Mashhady, A. S. and Aba-Husayn, M. M., 1979 The occurrence of pedogenic palygorskite (attapulgite) in Saudi Arabia Soil Sci. 128 211 – 218.CrossRefGoogle Scholar
Farmer, V. C. and Farmer, V. C., 1974 The layer silicates Infrared Spectra of Minerals 331 – 363.CrossRefGoogle Scholar
Fukami, A. and Adachi, K., 1965 A new method of preparation of a self-perforated micro plastic grid and its application (I) J. Electron Microscopy 14 112 – 118.Google Scholar
Golden, D. C., Dixon, J. B., Shadfan, H. and Kippenberger, L. A., 1985 Palygorskite and sepiolite alteration to smectite under alkaline conditions Clays & Clay Minerals 33 44 – 50.CrossRefGoogle Scholar
Güven, N. and Carney, L. L., 1979 The hydrothermal transformation of sepiolite to stevensite and the effect of added chlorides and hydroxides Clays & Clay Minerals 27 253 – 260.CrossRefGoogle Scholar
Haden, W. L. Jr., Swineford, A. and Franks, P. C., 1963 Attapulgite: Properties and uses Clays and Clay Minerals, Proc. 10th Natl. Conf, Austin, Texas, 1961 New York Pergamon Press 284 – 290.Google Scholar
JCPDS (1967) Powder diffraction file, Sets 6–10 (Revised): Smith, J. V., ed., American Society for Testing and Materials, 1916 Race St., Philadelphia, Pennsylvania, p. 668.Google Scholar
Komarneni, S., 1986 Mechanisms of mineral alterations as revealed by 27Al and 29Si magic angle spinning nuclear magnetic resonance spectroscopy Agronomy Abstracts Madison, Wisconsin American Society of Agronomy 276.Google Scholar
van der Marel, H. W. and Beutelspacher, H., 1976 Atlas of Infrared Spectroscopy of Clay Minerals and their Admixtures New York Elsevier, Publishing Co..Google Scholar
SAS Institute, 1985 SAS Users Guide: Statistics Cary, North Carolina SAS Institute.Google Scholar
Shadfan, H., Mashhady, A. S., Dixon, J. B. and Hussen, A. A., 1985 Palygorskite from Tertiary Formations of eastern Saudi Arabia Clays & Clay Minerals 33 451 – 457.CrossRefGoogle Scholar
Singer, A., Dixon, J. B. and Weed, S. B., 1989 Palygorskite and sepiolite group minerals Minerals in Soil Environments 2nd ed. Madison, Wisconsin Soil Science Society of America 829 – 872.Google Scholar
Weast, R. C., 1989 CRC Handbook of Chemistry and Physics 70th ed. Boca Raton, Florida CRC Press Inc. B – 457.Google Scholar