Abstract: The invention relates to a process for the desulphurization treatment of a pig iron melt in a container. The characterizing feature of the invention is that the treatment is performed in three phases:In the initial phase such solids are injected that deoxidize the initial slag and increase its basicity and also produce a circulatory movement of the melt and form a basic deoxidized cover slag. In the middle phase the desulphurizing agent is injected for the main desulphurization and in the final phase such solids are injected that purify the melt and produce a final desulphurization and also so influence the desulphurization slag formed that its content of iron granules is low.

Abstract: The invention relates to a slidable closure element for slide closures of metallurgical vessels, composed of a one-piece plate of heat resistant material which is engaged at its two opposite narrow edges by frame members that are drawn together by screws serving to tension them and hold them in contact with the edges of the plate.

Abstract: A slide gate nozzle for a slide gate carried by a closure frame which includes two independent arms pivotally connected with a casting vessel for slidably moving the slide gate with respect to the casting vessel and for moving the slide gate away from the vessel to facilitate changing of the ceramic plates. Rocker frames are pivotally connected with the arms and include rollers on which a guide rail rides in the sliding direction of the slide gate, and the swivelly connected rocker frame assures even pressure of the ceramic plates.