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.

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.

A method for the manufacture of a high alumina hydraulic binder comprising hydrating a source of aluminium ions with a source of calcium ions in the presence of water to form mineral hydrates and subsequently heating said mineral hydrates to form said high alumina hydraulic binder.

A method for preparing a general-purpose cement by chlorination roasting of aluminosilicates is provided, in which a mixture of aluminosilicates and sodium chloride is roasted in a steam atmosphere to obtain a roasted slag. The roasted slag is mixed with a material containing calcium oxide and magnesium oxide and ground to prepare a raw meal powder. The raw meal powder is subjected to oxidative calcination at a temperature not lower than 1240 C., followed by rapid cooling to obtain a calcined slag. The calcined slag is mixed with 0-3% by weight of caustic alkali and ground to obtain the general-purpose cement.

Uses of industrial waste clays for the manufacture of a supplementary cementitious material (SCM), wherein the industrial waste clays are kaolinitic clays selected from reject tails, cyclone tails, overburden/interburden from a refractory, ceramic, paper, oil or kaolin industries are described herein. A supplementary cementitious material (SCM) derived from calcined industrial waste clays wherein the obtained SCM maintain the same performance in comparison with other materials traditionally used and a method for manufacturing said SCM.

A method for treating limestone comprising raw meal in a cement clinker plant can be improved by first reacting the raw meal with a carboxylic acid (ROOH), thereby producing at least Ca(RCOO).sub.2, wherein the symbol R represents an organic group and subsequently converting the such obtained Ca(ROO).sub.2 into calcined raw meal by thermally decomposing the produced Ca(RCOO).sub.2 and/or Ca(RSO2O).sub.2 to thereby obtain at least CaO, CO.sub.2 and RCOH and/or RCOR.

Provided herein are compositions, methods, and systems related to 3D printing a reactive vaterite cement composition, comprising feeding a composition comprising reactive vaterite cement through a 3D printing machine; printing a 3D printed reactive vaterite cement product; and curing the 3D printed reactive vaterite cement product by transforming reactive vaterite cement in the 3D printed reactive vaterite cement product to aragonite and/or calcite during and/or after the curing.

A low-carbon production method and production system for cement clinker. The production method comprises calcining a metal oxide, which is obtained by converting carbonate in a raw material by means of a methane dry reforming reaction, to form cement clinker, and meanwhile obtaining synthesis gas. The production system uses a reformer furnace for methane dry reforming of carbonate to replace a carbonate decomposition furnace in an existing cement production system.

A method for producing a cement clinker, that includes using fuel containing gas fuel as fuel of a precalcination burner in a precalcination furnace that precalcinates cement clinker powder raw material.

Provided herein are compositions, methods, and systems related to 3D printing a reactive vaterite cement composition, comprising feeding a composition comprising reactive vaterite cement through a 3D printing machine; printing a 3D printed reactive vaterite cement product; and curing the 3D printed reactive vaterite cement product by transforming reactive vaterite cement in the 3D printed reactive vaterite cement product to aragonite and/or calcite during and/or after the curing.