Abstract
Coals of different ranks having their sulfur content distributed in different forms were heated up to 1000°C. It was shown that the higher the rank of the coal the more sulfur remained in the coke. The retention of sulfur in the coke is strongly dependent on the proportion of the thiophenic sulfur in the organic coal sulfur. The sulfur in the cokes examined was mainly organic in form. Iron sulfide, FeS, constituted most of the inorganic sulfur. A correlation was observed between the sulfide sulfur content in coke and the pyritic sulfur content in coal. The form and size of the iron sulfide present in the coke were determined by microscopic examination.
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