The invention provides a novel, steam-assisted production methodology and associated compositions and methods of use in the manufacture of carbonatable or non-carbonatable metal silicate or metal silicate hydrate (e.g., calcium silicate or calcium silicate hydrate) compositions. These metal silicate compositions and related phases are suitable for use hydraulic, partially hydraulic or non-hydraulic cement that sets and hardens by a hydration process, a carbonation process or a combination thereof, and may be applied in a variety of concrete components in the infrastructure, construction, pavement and landscaping industries.

The invention relates to a method and a system for obtaining a recyclable product from waste minerals by heating the mineral waste in a combustor by combusting waste fuel in a closed loop combustion process and treating the mineral waste with high levels of oxygen and/or carbon dioxide. A mixture of waste minerals for recycling and waste fuel for combustion is supplied to a combustor, also concentrated oxygen and recycled flue gas comprising carbon dioxide is supplied to the combustor for heating the mineral waste in an atmosphere of increased oxygen and carbon dioxide level to obtain a recyclable product from the waste minerals.

The invention relates to a method and a system for obtaining a recyclable product from waste minerals by heating the mineral waste in a combustor by combusting waste fuel in a closed loop combustion process and treating the mineral waste with high levels of oxygen and/or carbon dioxide. A mixture of waste minerals for recycling and waste fuel for combustion is supplied to a combustor, also concentrated oxygen and recycled flue gas comprising carbon dioxide is supplied to the combustor for heating the mineral waste in an atmosphere of increased oxygen and carbon dioxide level to obtain a recyclable product from the waste minerals.

An installation for thermal treatment of free-floating raw material, in particular cement raw meal and/or mineral products, may include a riser line through which hot gases can flow. The riser line has at least one fuel inlet for introducing fuel into the riser line. The riser line has at least one raw meal inlet for introducing raw meal into the riser line, which raw meal inlet is arranged upstream of the fuel inlet in a flow direction of gas inside the riser line. Further, a method for thermal treatment of free-floating raw material may involve introducing fuel via a fuel inlet into a riser line for guiding hot gases and introducing raw meal into the riser line. The raw meal is introduced into the riser line upstream of the fuel inlet in the flow direction.

The disclosure relates to the technical field of cement manufacturing, and specifically relates to a calcination system and method for low-carbon cement clinker. The calcination system includes: a kaolin calcination assembly including a preheater and a decomposition furnace, where the preheater is provided with a multi-stage cyclone cylinder; the preheater is provided with a feed port and a discharge port; the decomposition furnace is provided with a fuel adding port and a raw material inlet; the raw material inlet is connected to the discharge port; activated kaolin is generated by the decomposition furnace through calcination; and the decomposition furnace has a calcination temperature of 700 C. to 850 C. and calcination time of 0 h to 1.5 h, and a calcination atmosphere in the decomposition furnace is an oxygen-enriched atmosphere or a CO reducing atmosphere; and a cement calcination assembly configured to generate cement clinker through calcination, where the activated kaolin is added to a discharge side of the cement calcination assembly according to a predetermined ratio of the activated kaolin to the cement clinker. Use of carbon-containing raw materials in clinker production and carbon emissions of clinker are reduced, and a hydration rate of the cement clinker is adjusted.

The present application belongs to the technical field of a cement material, and specifically relates to a method for preparing cement clinker and a cement material. The method for preparing cement clinker provided by the present application comprises the following steps: 1) preparing cement raw meal; 2) calcining the cement raw meal under an oxygen-rich atmosphere, the oxygen-rich atmosphere being mixed gas of oxygen and carbon dioxide in a volume ratio of (0.21-0.61):(0.39-0.79). The method for preparing the cement clinker of the present application is not easy to generate the pollutant NO.sub.x, the main component in the flue gas is CO.sub.2, which is more conducive to carbon capture and sequestration, and the cement clinker obtained has a high content of C.sub.3S, and the cement clinker has good performance (hydration effect and stability).