Abstract: Thrust grate with a stationary grate component and with a grate component (2) moved forwards and backwards and is connected to members for its lateral guidance. These members are formed by oppositely arranged tension elements (3) stretched between the moved grate component (2) and a stationary structural part (1) essentially horizontally and perpendicularly to the direction of movement of the grate.

Abstract: Cooler for combustion products, with a conveyor through which air flows, which cooler is formed by a stationary grate surface (7) and a conveyor (8). The conveyor contains a plurality of drivers (9) moved at a distance from one another over the grate surface. A pre-space (30) is formed at the back of the feed stream fed to the grate (7,8), which pre-space is delimited on the underside by the conveyor (7,8) and accommodates a slope of the products to be cooled. The products in the pre-space are intensively cooled and surround the drivers in a protective manner as the latter enter the hot product bed.

Abstract: In a grate cooler, the unstable state which is attributable to an unusually strong accumulation of the combustion material is prevented by the fact that the waste air from the cooler, which is to be fed as secondary air to the kiln, is injected with water. This is expediently carried out in the inlet region of the cooler in dependence upon the temperature and/or the pressure of the secondary air in the kiln hood.

Abstract: A method and an apparatus for separating crops and impurities are described, which exploit the different specific gravities of the materials to be separated. The separation is performed with the help of a liquid exploiting the different lifting forces, since the materials to be separated differ clearly in specific gravity. If the specific gravity of the separating liquid does not suffice to effect the necessary lift for the crop, one produces a flow acting against the sinking direction of the impurities to increase the lifting force for the crop and cause it to collect by floating on the surface of the separating liquid. Water is preferably utilized as a separating liquid, and the flow is produced with the help of a pump wheel or bucket wheel. The method has proven especially useful for separating potatoes and stones.

Abstract: The invention relates to a method for blowing oxidizing gases into molten metal located in a reaction vessel having tuyeres below the metal bath surface, whereby the oxidizing gases are blown into the molten metal from these tuyeres and fed to the tuyeres at an inlet pressure between 85 bars and 170 bars.

Abstract: In a process for the production of a metal melt in a metallurgical vessel, the filter dusts incurring in producing the metal melt are to be processed to charging substances without causing a load on the environment and without great expenditures.This is achieved in that the filter dusts are introduced into the metallurgical vessel by aid of a gaseous conveying medium composed of natural gas or a mixed gas primarily containing natural gas, the filter dusts being supplied to the metallurgical vessel in a closed system and reduced by the carrier gas.