Abstract: The invention relates to a method for injecting reducing agents into a shaft furnace in which the reducing agent is transported within a pneumatic delivery stream to the shaft furnace according to the flowing steps; a) dividing the delivery stream into a number of partial streams, b) transferring the individual partial streams through a heating unit, and c) heating the reducing agent within the individual partial streams inside of the heating device. A device for carrying out the inventive method comprises, for example, a delivery line in order to pneumatically deliver the reducing agent to the shaft furnace, and a number of heat exchange pipes which are integrated in the delivery line using a parallel connection, said connection relating to flow techniques, such that the pneumatic delivery stream is divided into a number of partial streams. The inventive device also comprises a heating unit for transmitting heat energy to the individual partial streams.

Abstract: The invention relates to a process for regenerating used foundry sand, whose original molding sand contained, as the molding material, inorganic binders such as, for example and especially, bentonite ("inorganic used sand") and/or organic binders such as, for example and especially, phenolic resins and/or furan resins ("organic used sand"), wherein the used sand to be reconditioned is impregnated with water and then transferred in the moist state into a heated fluidized bed.

Abstract: A method for processing hot, liquid slag includes the steps of: conveying the slag to be processed to an upper region of a granular material forming a fluidized bed that has a temperature below the solidification temperature of the slag; cooling the slag to a temperature below its solidification temperature while simultaneously forming granules; and maintaining the temperature of the fluidized bed at a temperature below the solidification temperature of the slag.

Abstract: A device for the separation of solid particles from a gas flow that is loaded with solid particles, particularly for the separation of coarsely grained solid particles, includes a housing through which the gas flow to be cleaned has to pass and a discharge opening for the solid particles. A generally dynamically balanced guidance and torsion element is disposed within the housing a specifiable distance from the inner wall of the housing. A submerged tube is disposed on the discharge end of the housing. The torsion element has at least one spiral-shaped helical element on its outer side which imparts a rotational directionality to the gas flow that is loaded with solid particles about a symmetry axis of the separator.

Abstract: A process and apparatus for the metered introduction of fine-grain materials, particularly pulverulent solid substances (i.e., coal dust) from a pressurized metering container which contains a supply of solid material, into an industrial furnace having a plurality of feed locations such as a blast furnace or cupola furnace is presented. The solid material is fed to the individual feed locations in a carrier gas stream through a conveying duct, the gas stream being highly charged with the solid material. The carrier gas is fed to the lower end section of the metering container in a flow which causes a local loosening in the lower section of the supply of solid material with the conveying ducts opening into the loosening region. The apparatus includes a metering container, which is designed as a pressure vessel and which is adapted to be filled at its upper end section with solid material to be fed to the furnace. The metering container includes at its lower end section a plurality of upwardly open chambers.