Heat Altered Coal and Its Use in Metallurgical Coke Making

摘要

1. Introduction The effects of igneous intrusion on coal are observed in various parts of the world. Thermally altered coals are known by various names, such as, geological coke, natural coke, cinder etc. The nature and intensity of coal alteration depend on the temperature of the intrusion, the duration of magmatic heating and the distance from direct contact with the igneous rock. In general, igneous intrusions cause dramatic changes in vitrinite reflectance, mineralogy and geochemistry of the coal seams. In most cases, these changes are gradual with distinct physical, chemical and microscopical properties.