Thermal decomposition and chemism of hydronium jarosite

Abstract

A study is reported of the controlled decompositions and chemism of the technological hydronium jarosite. Chemical and spectroscopic methods were employed to determine the amounts of impurities present in jarosite. Thermogravimetric data were amassed both in the increasing and constant temperature mode. Proposed kinetic equations of Arrhenius type were tested against the results of constant temperature experiments. Differences are explored in the course of the decomposition of hydronium jarosite and that of pure ferric sulphate enneahydrate. In addition, the effects of temperature and reaction time were investigated on the amount of sulphates remaining in the calcined particles.