Abstract: In order to reduce the wear and to facilitate the replacement, a nozzle block comprises a mounting plate which is connected to the kiln shell, a nozzle tube which extends in the mounting tube and defines a clearance with the mounting tube and with the kiln lining, an abutment surface provided at the lower end of the nozzle tube and engaged by the orifice plate and which is clear of the body of the nozzle tube, a retaining tube which extends in the nozzle tube and defines a clearance with the nozzle tube and with the orifice plate, a gas feed duct attached to the side of the mounting tube and a cover on the mounting tube.

Abstract: The invention concerns a rotating round cooler for the cooling of hot loose material, especially hot iron ore sinter, consisting of a ring-form base plate, which is supported with treadrollers on a circular rail, a holding apparatus fastened to the base plate, a cooling chamber which is fastened movably to the holding device with inner and outer walls permeable to gas, whereby at least the bottom edge of the outer wall is located some distance from the base plate, a horizontal passage to the center of the cooler, a charging apparatus above the cooling chamber, a pick-off above the base plate and in the midst of the cooled material, a drive device for the rotary movement of the cooler, inlet devices for the gaseous cooling medium on the inside of the holding device, as well as blowers for the production of the pressure required for the cooling medium.