Study on the Utilization of Pyrrhotite Principally Composed of Iron and Sulfur. III : On Sulfur Making by the Catalytic Reduction of Roasting Gases with Blast Furnace Gases

1. In the first place, pure sulfur dioxide was catalytically reduced with pure carbon monoxide, using three kinds of catalyser, and the following conditions were studied with a view to obtaining the greatest yields of sulfurs : - (1) Kind of catalyser. (2) Temperature of catalyser. (3) Decrease of catalyser-efficiency, due to continuous use. (4) the relation between weight of catalyser and flow of gas. 2. From a practical standpoint the use of blast furnace gases, instead of pure carbon monoxide, yielded comparatively better results, preventing the decrease of catalyser-efficiency, because of dilution of gas with nitrogen. 3. Finally, using the roasting gases, from which oxygen was removed, in place of pure sulfur dioxide, still better results were otained