Refractory clays in the Transvaal : exploration, genesis and property interrelationships

Abstract

Refractory clay is defined for the purposes of this study as having a fusion temperature of at least I 605°c (Seger cone 27). It can be regarded as one of the most important industrial raw materials in view of its impact on virtually all high-temperature industries. Long-term statistics reveal the somewhat alarming trend that more flint than non-flint refractory clay will be consumed in South Africa over the next 20 years in spite of the much more limited reserves of the former. The basic aims of the study were to locate sufficient resources of refractory clay and to investigate aspects which could serve as an aid in future exploration.