A clinker inlet distribution grate for feeding a conveyor grate with clinker, previously discharged from a kiln onto the clinker inlet distribution grate wherein the clinker inlet distribution grate comprises at least a chute with at least two grate elements being arranged one besides the other providing a chute enables to easily remove clinker agglomerations, so called snowmen if at least a first of said at least two grate elements is static and that at least a second of said at least two grate elements is movable orthogonally to the cross direction of the chute.

The present invention relates to modification of hydratable cement and cementitious materials, such as mortar cement and masonry or ready-mix concrete using ketone alcohol oil waste (KAOW) material, obtained as an alkali-soluble liquor waste byproduct at a certain stage in the commercial production of cyclohexanol and cyclohexanone. Preferred applications for KAOW are in chemical admixture formulations whereby KAOW is used to substitute for a portion of a cement dispersant such as sodium lignosulfonate, sodium gluconate, or other conventional dispersant. Another preferred use is in mortar cement and masonry concrete units such as blocks, pavers, curbstones, and other concrete masonry units wherein air void systems advantageously foster freeze-thaw durability.

The present invention relates to modification of hydratable cement and cementitious materials, such as mortar cement and masonry or ready-mix concrete using ketone alcohol oil waste (KAOW) material, obtained as an alkali-soluble liquor waste byproduct at a certain stage in the commercial production of cyclohexanol and cyclohexanone. Preferred applications for KAOW are in chemical admixture formulations whereby KAOW is used to substitute for a portion of a cement dispersant such as sodium lignosulfonate, sodium gluconate, or other conventional dispersant. Another preferred use is in mortar cement and masonry concrete units such as blocks, pavers, curbstones, and other concrete masonry units wherein air void systems advantageously foster freeze-thaw durability.

Cement and concrete additives and related methods of making and using such additives are disclosed and described. An additive can include molasses and a carrier. An enhanced Portland cement composition can comprise about 97 wt % to 99.9 wt % of the composition and the above described additive comprises about 0.01 wt % to about 3 wt % of the composition.

Cement and concrete additives and related methods of making and using such additives are disclosed and described. An additive can include molasses and a carrier. An enhanced Portland cement composition can comprise about 97 wt % to 99.9 wt % of the composition and the above described additive comprises about 0.01 wt % to about 3 wt % of the composition.

The invention relates to a method and a system for producing cement clinker from raw cement mixture, wherein one part of the raw cement mixture is preheated in a calciner preheater, and the other part of the raw cement mixture is preheated in an oven preheater, the preheated raw cement mixture is pre-calcined in a calciner which is operated according to the oxyfuel method, the pre-calcined raw cement mixture is fired in an oven, the fired raw cement mixture is cooled in a cooler, the calciner preheater is operated using exhaust gases of the calciner, the oven preheater is operated using exhaust gases of the oven, an entrained flow reactor is used as the calciner, a part of the calciner exhaust gas being recirculated to the calciner after being used in the calciner preheater, and the oven exhaust gas undergoes a post-combustion CO.sub.2 separation.

The invention relates to a method and a system for producing cement clinker from raw cement mixture, wherein one part of the raw cement mixture is preheated in a calciner preheater, and the other part of the raw cement mixture is preheated in an oven preheater, the preheated raw cement mixture is pre-calcined in a calciner which is operated according to the oxyfuel method, the pre-calcined raw cement mixture is fired in an oven, the fired raw cement mixture is cooled in a cooler, the calciner preheater is operated using exhaust gases of the calciner, the oven preheater is operated using exhaust gases of the oven, an entrained flow reactor is used as the calciner, a part of the calciner exhaust gas being recirculated to the calciner after being used in the calciner preheater, and the oven exhaust gas undergoes a post-combustion CO.sub.2 separation.

A manufacturing apparatus for providing a reduced cementitious material comprising a heating device, a reducing device, and a cooling device. The reducing device has a first end comprising a gas seal and being connected to the heating device, such that a heated cementitious material from the heating device is feedable to the first end of the reducing device substantially without any gas from the heating device entering the reducing device. The reducing device has a second end connected to the cooling device, such that a reduced cementitious material formed in the reducing device is provided to the cooling device. The reducing device further has transporting means configured to transport cementitious material from the first end to the second end and is configured for receiving a reducing agent or a precursor for a reducing agent.

A manufacturing apparatus for providing a reduced cementitious material comprising a heating device, a reducing device, and a cooling device. The reducing device has a first end comprising a gas seal and being connected to the heating device, such that a heated cementitious material from the heating device is feedable to the first end of the reducing device substantially without any gas from the heating device entering the reducing device. The reducing device has a second end connected to the cooling device, such that a reduced cementitious material formed in the reducing device is provided to the cooling device. The reducing device further has transporting means configured to transport cementitious material from the first end to the second end and is configured for receiving a reducing agent or a precursor for a reducing agent.

A method for operating a plant for producing cement clinker, wherein the plant comprises as plant units, in the direction of gas flow, at least one clinker cooler, at least one rotary kiln, at least one calciner, at least one heat-exchanger line including heat-exchanger cyclones, and at least one device for crushing raw meal and/or cement clinker, and also a corresponding plant for producing cement clinker. At least one plant unit is enclosed, whereby the plant unit is provided with a second covering with respect to the atmosphere, and the enclosure is subjected to process gas from a compressor.