Abstract: A process and apparatus for manufacturing cement clinker in which pellets of raw material containing the necessary components for manufacturing the clinker are introduced into an apparatus where the pellets flow under gravity, successively through a preheating zone, a clinkering zone using a fluidized bed and a cooling zone. The pellets contain an amount of comminuted carbon determined so that its combustion produces an amount of heat within each pellet sufficient to carry out decarbonation of the material, taking into account the heat introduced by the hot gases passing upwardly through the apparatus. Decarbonation is completed at the base of the preheating zone and the pellets enter the clinkering zone at a temperature which is close to the clinkering temperature. Additional heat is supplied through burners within the clinkering zone.
Abstract: In a method of reduction of a mineral on a continuous moving grate, the material layer is passed through a plurality of processing zones of the grate on a layer of chemically inert material and the gas flows through the layers in the zones alternate between a downward direction and an upward direction to limit the temperature of the grate and to use the heat taken up by the inert layer to heat the processing gases.
Abstract: An installation for the agglomeration of minerals including, a rotatable circular track, a plurality of grate-carrying cars which rest on the track and move with it through various treatment zones, and a device for moving the cars relative to the track through a discharge zone. The device may tilt each car as it passes through the discharge zone in order to unload treated minerals from the grate on the car.
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