Abstract: In a cyclone and a method for operating a cyclone, in a duct leading to an inlet of the cyclone, at least partial separation of particles according to size takes place. A bypass arrangement diverts selected particles to the discharge duct of the cyclone. The cyclone is suitable for separating particles from blast furnace waste gases.

Abstract: In a cyclone and a method for operating a cyclone, in a duct leading to an inlet of the cyclone, at least partial separation of particles according to size takes place. A bypass arrangement diverts selected particles to the discharge duct of the cyclone. The cyclone is suitable for separating particles from blast furnace waste gases.

Abstract: An apparatus for cooling a vessel containing molten metal has a quantity of liquid coolant atomized by a gaseous medium and onto a surface to be cooled. The supply of gaseous medium is constant while the supply of liquid coolant to the spray nozzles is controlled by at least one valve the operation of which is brought about by a non-electrical temperature responsive element in thermal contact with the surface to be cooled. The rate at which the liquid coolant is sprayed on to the hot surface is controlled such that the volume of coolant sprayed on to the surface to be cooled does not exceed the volume of liquid that is capable of being vaporized from the surface.

Abstract: A granulator comprises a rotary atomizer on to which the molten material to be granulated is poured in a stream. The rotation of the atomizer causes the molten material to be ejected therefrom in the form of globules. No fluid jets are used to break up the molten material. The globules pass through an enclosure and partially freeze to form granules which are collected in an annular trough. A gas is injected into the trough to induce a circumferential movement of the granules within the trough towards at least one exit from the trough.