The yield of cement clinker which is reproduced from the kiln assembly, there is increasing the particulate material, for example, fly ash having at least one oxide of silica and calcium and aluminum hameuroseo supply in contact with the hot cement clinker, wherein the fly ash is chemically and hot clinker melt and the reaction partially soluble to the material making the heat treated cement clinker of determining hydraulic silicates, it is added to the hot cement clinker for the extender in the downstream for the formation of the cement clinker and, or kiln from an upstream end of the cooler of the kiln assembly within the in particular, downstream of the burning zone, and appropriately added to the hot cement clinker in the initial cooling zone at the discharge end of the kiln.; Kiln assembly, cement clinker, silica, calcium, aluminum, oxide, particulate materials, fly ash, bottom ash, hydraulic silicates, heat treatment, extenders
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