Chemical Studies on the Sulfur of Japanese Coals(III)

Abstract

The results of an investigation of the relation of the distribution of sulfur compounds during carbonization to the various characteristics of coal, and that on the behavior of organic sulfur in softening stage were described as follows.(1) The distribution of the sulfur compounds during carbonization was considerably influenced by inorganic constituents in coal in respects of their total amount and the different kinds of constituents, and it was especially observed that the basic compounds have a property of fixing sulfur.(2) The sulfur compounds in coal remained in coke after carbonization at the ratio of 60% for total sulfur, 90% for pyritic sulfur, and 60% for organic sulfur.(3) Regarding the chemical behavior of sulfur compounds during carbonization, the following results were obtained.In the case of caking coal having carbon content more than 80%, the reactivity for volatilization of organic sulfur and consequently the quantity of sulfur volatilized increased in softening stage, and the definite relation was found between the total of volatilized sulfur during carbonization and the rank of samples, that is, the more the reactivity for volatilization of organic sulfur is the larger the total of volatilized sulfur during carbonization.On the other hand, in the case of non-caking coal having carbon content less than 80%, the definite relation was not found among the total of volatilized sulfur during carbonization, the rank of coal and the reactivity for volatilization of organic sulfur, since it was supposed that the basic structure of coal substance in such coal have a great influence on the behavior of sulfur compounds during carbonization.