The present invention concerns an apparatus and a method for manufacturing a product from a raw material. The apparatus comprises a rotary kiln having a first rotary kiln end and a second rotary kiln end, and a cooling unit which is connected to the second rotary kiln end, wherein a process direction is provided leading through the rotary kiln from the first rotary kiln end to the second rotary kiln end and further through the cooling unit, wherein the cooling unit is configured to transport the product in the process direction through the cooling unit for cooling the product, the rotary kiln comprising a burning unit at the second rotary kiln end, the burning unit being configured to receive a flammable material and an ignition gas to create heat inside the rotary kiln and to produce a combustion gas containing carbon dioxide, the rotary kiln being configured to transport raw material received at the first rotary kiln end in the process direction towards the second rotary kiln end, and, by using the heat, to transform the raw material into the product and into a resigning gas comprising carbon dioxide, characterized in that the apparatus comprises a gas outlet configured to remove an exhaust gas comprising the resigning gas and the combustion gas from the rotary kiln, and that the cooling unit is configured to transport a cooling gas in the process direction over the product.

The present invention discloses various applications of split hydrocarbon processing (SHCP) across an array of technologies for hydrogen (H.sub.2), power and industrial production purposes. These applications generate nearly pure carbon dioxide CO.sub.2 with no need for separation, making it ready for compression and storage or utilization.

A method for manufacturing cement clinker includes the steps: preheating a raw meal in a first preheater using kiln off-gas to provide a partially preheated raw meal, preheating the partially preheated raw meal in a second preheater to provide preheated raw meal, precalcination of the pre-heated raw meal in a calciner being a circulating fluidized bed reactor by burning fuel with oxygen and recirculated calciner exhaust gas instead of air to provide a precalcined raw meal wherein at least 2 mbar overpressure are adjusted in the calciner, transferring the precalcined raw meal to a rotary kiln for sintering to provide the cement clinker, cooling the cement clinker, and capturing carbon dioxide from a calciner exhaust gas in a carbon dioxide purification unit.

A cement clinker producing system, capable of providing a gas containing a carbon dioxide gas at a high concentration by increasing a carbon dioxide gas concentration for a part of an exhaust gas, includes a cyclone preheater to preheat a cement clinker raw material, a rotary kiln to burn the preheated cement clinker raw material so as to provide cement clinker, a calcination furnace to promote decarbonation of the cement clinker raw material, a clinker cooler to cool the cement clinker, a kiln exhaust-gas discharge passages to discharge an exhaust gas generated in the rotary kiln, a combustion-supporting gas supply device to supply a combustion-supporting gas having a higher oxygen concentration than air, a combustion-supporting gas supply passage to guide the combustion-supporting gas to the calcination furnace, and a calcination furnace exhaust-gas discharge passage to discharge a carbon dioxide gas-containing exhaust gas generated in the calcination furnace.

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.

A method for producing supplementary cementitious material. The method comprises contacting a mineral stream with an acid to form an activated mineral stream; reducing the moisture content of the mineral stream; and comminuting the mineral stream to form a supplementary cementitious material. A method of extracting a metal from a mineral stream. The method comprises contacting a mineral stream with an acid to form an activated mineral stream; filtering the activated mineral stream to extract leach liquor comprising the metal; and neutralizing the acid.

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 method of calcining a clay material for use as a supplementary cementitious material, includes providing a raw clay material, optionally drying the raw clay material, granulating the raw clay material in order to obtain raw clay granules, calcining the raw clay granules to obtain calcined clay granules, and grinding the calcined clay granules to obtain a pulverulent supplementary cementitious material.

A comprehensive utilization method for iron separation tailings from magnetizing-roasted red mud includes the following steps: performing a wet magnetic separation for tailing discarding on iron separation tailings from magnetizing-roasted red mud, to obtain a rough concentrate and non-magnetic minerals; performing a purification by gravity separation on the rough concentrate to obtain a wet iron concentrate and light minerals; dehydrating the wet iron concentrate to obtain an iron concentrate; combining, and then dehydrating, drying, and disintegrating the non-magnetic minerals and the light minerals, to obtain iron extraction tailings; uniformly mixing the iron extraction tailings, and crushed, ground, and dried limestone, clay, and quartz sand separation tailings according to a predetermined ratio to obtain a cement raw meal; pressing, and then calcining and quenching the cement raw meal to obtain a cement clinker; and mixing the cement clinker and a gypsum followed by a dry grinding to obtain a silicate cement.