抄録
There are two methods for determining sulphide sulphur in slags, namely direct method or evolution method and indirect method. The principle of the former is that slags are treated with hydrochloric acid and H2S evolved is absorbed in absorbing solution and determined. The principle of the latter method is that total sulphur and sulphate sulphur in slags are respectively determined and the differerence between those two values is taken as representing sulphide sulphur. In order to decide which f these two methods is better as the method for determining total sulphide sulphur, we applied both methods to blast furnace slags and basic open-hearth slags, and found that values obtained by the latter method were always higher than those obtained by the former. An investigation into the cause of this disagreement clarified the fact that slags contain more or less HCl-insoluble sulphide which can not be determined by direct method, but can be determined by indirect method ; and arrived at the c nclusion that indirect method is more reasonable than direct method from the point of view of the determination of total sulphide sulphur. Moreover, we found that in blast furnace slags 1-3% of total sulphur were contained as sulphate while with basic open-hearth slags the content was 2-12%.
