Clean version of the Abstract A production method of ready injection material aims at developing natural hydraulic lime at nano-size by using a single raw material. The production method includes: selecting marl, comprising at least 70% CaCO.sub.3, as the raw material, grinding the marl to have particle size lower than 400 lam, calcining the marl at a temperature between 1000-1200 C., re-grinding the marl after the calcination process, reducing a d.sub.90 particle size of calcined marl to between 200-700 nm after the grinding process, applying a dry mixing process to the material having a reduced particle size, adding water to the material after dry mixing and applying mechanical mixing process during duration between 3-6 minutes at a revolution between 800-1000 rpm, adding super-fluidizing chemical additive to the obtained material, and mixing the material for duration between 3-6 minutes by using ultrasonic homogenizer and mechanic mixing.

A calcination unit able to decarbonate raw materials intended for clinker production, the unit including: a main duct in which the raw materials circulate according to a first movement direction, the raw materials being calcined in the main duct; a solid fuel supply duct opening onto the main duct via a fuel outlet, the solid fuel moving according to a second movement direction; a retaining device located in the main duct and arranged opposite the solid fuel outlet so that the solid fuel arriving in the main duct via the fuel outlet passes through the retaining device.

The present disclosure relates to a method of thermal treatment of air-dispersible raw material, especially cement raw meal and/or mineral products, wherein the raw material is introduced into a conduit through which hot gases flow and is subjected to thermal treatment by the hot gases and/or the radiant heat in the conduit, fuel is at least partly converted in a treatment region, and the heat generated in the treatment region is supplied at least partly to the conduit, and an oxygen-rich gas is introduced into the treatment region, wherein the oxygen content in the hot gas and/or the gas temperature is ascertained and the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained and/or the oxygen content.

A belite-ye'elimite-ternesite cement clinker includes: ye'elimite: 20-50 wt. %; ternesite: 24-50 wt. %; belite: 10-35 wt. %; and free-calcium sulfate (f-C$): 2-10 wt. %. The composition of cement clinker includes an appropriate amount of ye'elimite minerals, ensuring fast early hydration and high early strength of the cement clinker. The cement clinker further includes a certain amount of free-calcium sulfate (f-C$), and is characterized by its good grindability, leading to decreased energy and mechanical losses essential for clinker grinding. This environmentally conscious and energy-efficient method aligns with the global objective of reducing carbon emissions.

A low-carbon cement clinker, having the following parameter ranges: alkalinity coefficient C: 1.0?C?1.5; aluminum-sulfur ratio P: P<1.92; aluminum-silicon ratio N: N<1; and limestone saturation coefficient Cs: 0.9?Cs<1.0. The specific range of each parameter value ensures an idea ratio of mineral composition in the low-carbon cement clinker. The ratio promotes a coordinated interaction among different minerals and compounds present when exposed to water, leading to improved strength development and overall performance of the final cement product.

A fluidized calciner is provided which allows a reduction in the rate of unburned fuel at an outlet of a fluidized calciner to enable sufficient calcination while preventing possible occlusion in a preheater, even when pulverized coal of coal or coke, which has low combustion quality, is used as fuel, based on calculations in accordance with computational fluid dynamics based on the shape of an actual furnace and operational conditions. The present invention provides a fluidized calciner including a tubular furnace body (2) in which an axial direction is an up-down direction, a pulverized coal blowing line (3) through which fuel is blown into the furnace body (2), a raw material chute (4) through which a cement raw material is loaded into the furnace body (2), at least one air introduction pipe (5) through which introduced air is sucked, the pulverized coal blowing line (3), the raw material chute (4), and the air introduction pipe (5) being connected to a side portion of the furnace body (2), and a fluidizing air blowing port (6) disposed at a bottom portion of the furnace body (2) and through which fluidizing air is blown into the furnace body (2), in which a blowing port of the pulverized coal blowing line (3) is disposed below a suction port of the air introduction pipe (5) and above the fluidizing air blowing port (6).

A calcination unit able to decarbonate raw materials intended for clinker production, the unit including: a main duct in which the raw materials circulate according to a first movement direction, the raw materials being calcined in the main duct; a solid fuel supply duct opening onto the main duct via a fuel outlet, the solid fuel moving according to a second movement direction; a retaining device located in the main duct and arranged opposite the solid fuel outlet so that the solid fuel arriving in the main duct via the fuel outlet passes through the retaining device.

A powder metallurgical component has a chromium content of at least 80% by weight and pores and/or oxide inclusions which are present in the component. The number per unit area of a sum of pores and oxide inclusions at a cut surface through the component in at least one region is at least 10,000 per mm.sup.2.

A plant for production of cement clinker from raw meal, having a calciner for deacidification of the raw meal and a rotary furnace for sintering the deacidified raw meal to give cement clinker. The deacidified raw meal flows through a cyclone preheating stage into the rotary furnace. A reactor is provided upstream of the calciner on the flow path of the rotary furnace offgas to the calciner, to which an inlet for the rotary furnace offgas leads. A corresponding method of operating such a plant wherein fuel is added to the reactor in a superstoichiometric amount in relation to the residence time of the offgases in the reactor, such that carbon dioxide present in the offgases is reduced to carbon monoxide. At least one input air conduit for supplying input air, preferably coming from a tertiary air conduit, is provided at at least one point in the reactor.

A method for denitrification of flue gases and a system, wherein flue gases generated in a rotary kiln are conveyed to a calcining zone for the deacidification of raw cement meal. Aqueous ammonia solution, ammonia, or ammonia-releasing substances for denitrifying the flue gases injected into the calcining zone according to the method of selective non-catalytic reduction (SNCR), and the flue gas stream, together with an ammonia slip generated during the denitrification, is passed through a heat exchanger and through at least one dedusting device. The flue gas is guided through a exhaust gas line via a catalyst for the decomposition of excess ammonia with residues of nitrogen oxide in accordance with a method of selective catalytic reduction (SCR), wherein the catalyst is arranged in a reactor provided in the exhaust line, and is no larger than is required for a sufficient decomposition of the ammonia.