Reactions of ammonium sulphates with kaolinite and other silicate and oxide minerals
- 1 September 1982
- journal article
- Published by Mineralogical Society in Clay Minerals
- Vol. 17 (3) , 271-283
- https://doi.org/10.1180/claymin.1982.017.3.01
Abstract
Interactions of ammonium sulphates and various silicate and oxide minerals have been studied by X-ray heating methods and simultaneous TG-DTA. Kaolinite and other clay minerals were found to be very susceptible to these sulphating treatments, (NH4)3Al(SO4)3, (NH4)Al(SO4)2 and Al2(SO4)3 being formed successively with increasing temperature from 350 to ∼550°C. The same reaction products were obtained on heating mixtures of (NH4)2SO4 and γ-Al2O3, Al(OH)3 and bauxite. Fe-, Mg- and Ti-silicates and oxides gave NH4-double sulphates below 400°C and the corresponding metal sulphates above this temperature.Keywords
This publication has 2 references indexed in Scilit:
- The crystal structure of triammonium hydrogen disulphate, (NH4)3H(SO4)2Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1978
- Sheet SilicatesPublished by Springer Nature ,1974