Halloysite-Kaolinite Transformation at Room Temperature
Halloysite (metahalloysite) of various particle sizes has been altered with oxalic and EDTA acids, at room temperature and during different periods of time (5–90 days). The oxalic acid attack at first achieved only a recrystallization of halloysite. The recrystallization is much more significant the smaller the size of the treated halloysite particles. Later the material is destroyed. The EDTA treatment also has provoked during the first days a recrystallization of the halloysitic material which is destroyed again after about 20–25 days. Later kaolinite is formed. The kinetic curve of kaolinite formation is symmetrical with respect to that corresponding to the diminution of amorphous material in the sample. The influence of the halloysite particle size and the complexing effect of the acids in relation to the resulting products are discussed.
Unable to display preview. Download preview PDF.
- Brindley, G. W. and Robinson, K. (1948) Structure of meta halloysite: Miner. Mag. 28, 393–406.Google Scholar
- Chen, P. Y. (1969) Occurrence and genesis of kaolin minerals from Taiwan (I). Kaolinite, halloysite and allo-phane: Proc. Geol. Soc. China 12, 30–48.Google Scholar
- Fieldes, M. (1955) Clay mineralogy of New Zealand soils —II: Allophane and related mineral colloids: N.Z. J. Sci. Technol. 37, 336–350.Google Scholar
- Galan, E. and Martin Pozas, J. M. (1971) Mineralogia de los caolines de La Guardia y El Rosal (Pontevedra, España): Est. Geol. 27, 75–80.Google Scholar
- Galan, E. (1972) Caolines españoles. Geologia, mineralogia y genesis. Thesis, Sciences Faculty, University of Madrid, Spain.Google Scholar
- Galan, E. and Martin Vivaldi, J. L. (1973) Caolines españoles. Geologia, mineralogia y genesis—III: Clasificación de los depósitos de caolines españoles segun su ambiente genetico: Bol. Soc. Esp. Ceram. y Vidrio. 12 (6), 333–340.Google Scholar
- Herri, J. D., Roberson, C. E., Lind, C. J. and Polzer, W. L. (1973) Chemical interactions of aluminum with aqueous silica at 25°C: Geol. Survey Water-supply Paper, 1827-E, p. 57.Google Scholar
- Keller, W. D. (1964) Processes of origin and alteration of clay minerals. Soil Clay Mineralogy (Edited by Rich and Kunze ), pp. 3–75. The University of North Carolina Press, Durham, North Carolina.Google Scholar
- Kinoshita, K. and Muchi, M. (1954) Bauxitic clay derived from volcanic ash: Kyushukozan-gakkai 22, 279–291.Google Scholar
- Klug, H. P. and Alexander, L. E. (1954) X-Ray Diffraction Procedures for Polycrystalline and Amorphous Materials. Wiley, New York.Google Scholar
- La Iglesia, A. and Martin Vivaldi, J. L. (1974) Synthesis of kaolinite by homogeneous precipitation at room temperature (I). Against anionic resins in (OH) form: 2nd Meeting of the European Clay Groups, Strasbourg. In press.Google Scholar
- Martin Pozas, J. M., Galan, E. and Martin Vivaldi, J. L. (1971) Il giacimento di caolino di Jove (Lugo, España): Atti. 1° Congresso Naz. Grup. Ital. AIPEA, 89–109.Google Scholar
- Sudo, T. and Takahashi, H. (1956) Shapes of halloysite particles in Japanese clays, pp. 67–79. Clays and Clay Min. 4th Conf. Nat. Acad. Sci. 456, Washington.Google Scholar