337 results about "Clinker (cement)" patented technology

The invention discloses a light telegraph pole cement material and a preparation method thereof, and relates to the technical field of cement concrete. The method comprises the following steps: firstly, carrying out acid pickling, silane coupling agent grafting and nanoparticle vacuum impregnation treatment on shale ceramsite to obtain modified light ceramsite; the preparation method comprises the following steps: ultrasonically dispersing graphene oxide, compounding with Portland cement clinker and modified fly ash, and reacting with epoxy resin emulsion, a curing agent and a silane coupling agent to prepare organic-inorganic composite modified cement; the bamboo skeleton is subjected to silane coupling agent pretreatment to obtain a modified skeleton; then, mixing composite cement, an additive and water into slurry, adding the modified ceramsite and aggregate, and performing high-speed stirring and ultrasonic dispersion to form homogeneous concrete slurry; and finally, putting the modified bamboo skeleton into a mold, injecting the slurry, and performing centrifugal forming, steam curing and natural curing to obtain the cement material. The prepared lightweight telegraph pole cement material has excellent mechanical strength.

The invention discloses a metal mine space carbon sequestration system and method based on upward filling of a segmented stope. A closed filling chamber is arranged in a staged blasting stope between a lower-stage filling body and an upper-stage unblasted ore body; an upper-stage drift roadway is arranged between the top of the closed filling chamber and the upper-stage unexploded ore body; a horizontal filling pipeline and a CO2 horizontal filling pipeline which are used for conveying the filling slurry and the CO2 gas to the closed filling chamber are arranged in the upper-stage access roadway, and the CO2 gas is mineralized to realize carbon sequestration through the filling slurry and the CO2 gas in the closed filling chamber. According to the method, the closed filling chamber is arranged in the goaf of the metal mine to seal and store the CO2 gas, the CO2 is utilized to be subjected to carbonization reaction with clinker minerals and hydration products in the filling cementing material, so that the dual purposes of'filling reinforcement 'and'filling carbon sequestration' are achieved, and environmental pollution cannot be generated in the whole CO2 gas sealing and storing process.

The invention discloses non-dispersible cement for underwater repair of concrete. The non-dispersible cement is prepared from the following raw materials in parts by weight: 30-50 parts of Portland cement clinker powder; 20-40 parts of functional grouting material dry powder; 15 to 30 parts of anti-dispersion reinforcing powder; 2-5 parts of a composite admixture; after the non-dispersible cement is mixed with water, the ratio of the underwater compressive strength of the formed underwater pouring slurry to the onshore standard curing compressive strength is not less than 0.7; therefore, the anti-dispersing agent is compounded with the carrier in advance to prepare stable powder, and the problems that the anti-dispersing agent is prone to caking on site and uneven in dispersion are solved. The single-component dry powder material can be used only by adding water and stirring, the construction is simple and convenient, and the dependence on the process and the cost is reduced while the excellent underwater anti-dispersion property and the early strength property are ensured.

The present application belongs to the technical field of underground filling of metal mines, and particularly relates to an iron tailings powder-based cementitious material for mine full tailings cemented filling, a preparation method and application thereof. The geopolymer-based anti-cracking mortar is made of iron tailings ultrafine powder, ore powder, sulphoaluminate clinker, Portland cement clinker, desulfurization gypsum and methyl cellulose ether. The iron tailings powder-based cementitious material can completely replace ordinary Portland cement in full tailings filling and achieve better cementing effect than cement, thereby greatly reducing the consumption of cement and other cementitious materials, lowering the filling cost, reducing carbon emissions and increasing the utilization rate of tailings. The rheological properties, mechanical properties and durability of the full tailings cemented filling material made of the iron tailings powder-based cementitious material can meet the requirements of mine filling, and the material can achieve the effect of expansion and roof contact without adding external additives, thereby solving the shrinkage problem of cement-based filling materials.

The invention belongs to the technical field of cement production line transformation, and discloses a method for transforming a cement clinker production line into a coal gangue suspension calcination production line, the cement clinker production line comprises five stages of double-series preheaters and a decomposing furnace, the five stages of double-series preheaters are divided into A-row preheaters and B-row preheaters, a preheater in the column A is transformed into a preheating device of the coal gangue powder suspension calcination production line, a preheater in the column B is transformed into a gas-solid separation cyclone and a cooling device of the coal gangue powder suspension calcination production line, and a pipeline furnace is arranged between an air outlet of a decomposing furnace and an air inlet of the gas-solid separation cyclone. A decomposing furnace and a pipeline furnace are jointly transformed into a coal gangue suspension calcining furnace. According to the method, an obsolete cement clinker production line is transformed into a coal gangue suspension calcining production line with the working procedures of coal gangue grinding, conveying, metering, preheating, calcining, cooling and the like.

The present application aims at the problems of excessive consumption of traditional cement limestone resources, excessive energy consumption and high carbon emission, and provides a carbonated hardened low-calcium cement and a preparation and hardening method thereof, which is a hardening method for curing low-calcium cement by CO2 carbonation. The mass percentage composition of cement raw material components is: limestone: 60-70%, sandstone or clay or silica ash: 15-25%, phosphogypsum, fluorogypsum or desulfurization gypsum: 5-25%, component A: 0.5-2%. Component A is composed of the following raw material components in mass percentage: fluorite 0-50%, barium slag: 0-50%, lithium slag 0-50%, wood ash 0-50%, industrial sodium carbonate 0-30%. The composition design of carbonated hardened cement clinker minerals is C2S: 10-90%, C5S2$: 10-90%, C$: 0-5%, C4A3$: 0-10%, etc. In the present application, the limestone required for the cement clinker is lower than that of ordinary Portland cement clinker, the calcination temperature is reduced by 200-350 DEG C than that of ordinary Portland cement clinker, and the energy consumption and carbon emission are significantly lower than those of Portland cement; the low-calcium cement is hardened by CO2 carbonation curing, which can make the cement obtain excellent mechanical properties within 2 hours.

The invention discloses a process and system for preparing an auxiliary cementing material by calcining granular coal gangue coupled with a cement clinker sintering system, and the process comprises the following steps: treating large undisturbed coal gangue to obtain granular coal gangue, and quantitatively analyzing minerals in the granular coal gangue; feeding the granular coal gangue raw material into an activating calcining kiln for activating and calcining; then feeding into a grate cooler for cooling to obtain calcined activated coal gangue; wherein an activation calcination heat source comes from high-temperature section hot air of a grate cooler and hot air at an outlet of a C4 preheater, the proportion of the high-temperature section hot air, the hot air at the outlet of the C4 preheater and combustion-supporting air is controlled, and temperature and oxygen concentration adjustment at the activation calcination stage is achieved. According to the invention, the system for preparing the auxiliary cementing material by calcining the coal gangue is coupled with the original cement clinker sintering system, so that the on-line doping of the auxiliary cementing material in the cement clinker is realized, and meanwhile, the carbon emission is reduced.

The invention discloses a cement clinker f-CaO content prediction method and system based on transfer learning, and belongs to the field of cement industry intelligent manufacturing and soft measurement. According to the method, process variable data of three sub-systems in a cement production line are collected, a CNN-Transform prediction model is constructed, local time sequence features of the sub-systems are extracted through three independent one-dimensional convolutional neural networks, a cross-variable cross attention mechanism is introduced to capture a dynamic coupling relationship among the different sub-systems, and the dynamic coupling relationship among the sub-systems is determined. A Transform encoder is used for learning global time sequence dependence, and an f-CaO content prediction value is output; according to the method, a transfer learning strategy is adopted, a model is pre-trained on source domain large sample data, and a specific layer freezing and fine tuning strategy is adopted on target domain small sample data for adaptation, so that the prediction precision of the f-CaO content and the generalization ability across production lines are remarkably improved, and effective support is provided for real-time optimization control in the cement production process.

The invention discloses microcapsule self-regeneration-based long-acting formaldehyde-removing cement and a preparation method thereof, and belongs to the field of building materials and environmental functional materials. The material is composed of Portland cement clinker and a functional composite additive, wherein the additive comprises Zn < 2 + > modified zeolite, a manganese-based catalyst, a pH-responsive sustained-release microcapsule and alpha-semi-hydrated gypsum. According to the invention, through the cooperation of zeolite selective adsorption, non-photocatalytic oxidation of the manganese-based catalyst in an alkaline environment and pH-triggered microcapsule self-regeneration, an adsorption-catalysis-regeneration function closed loop is formed, efficient and lasting removal of formaldehyde under a dark condition is realized, and the mechanical properties of a cement matrix are not damaged. According to the preparation method, the functional components are pre-compounded and then co-ground with the cement clinker, the process is simple, and the preparation method is suitable for industrial production.

The invention discloses high-durability quick-hardening concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials: aluminoferrite cement, vitreous calcium aluminate clinker, a coagulant nucleation agent, a nano hybrid siliceous material, a calcium-magnesium composite expanding agent, a self-healing agent, a hydration heat regulating agent, a water reducing agent, an early strength agent, a defoaming agent, a thickening agent, a retarder, an air entraining agent and aggregate. The coagulating nucleating agent is prepared from semi-hydrated gypsum, ferrous sulfate and aluminum potassium sulfate; the nano hybrid siliceous material is prepared by reacting acidic silica sol with sodium methyl silicate at 40-60 DEG C for 1-3 hours. According to the high-durability quick-hardening concrete and the preparation method thereof, the iron aluminate cement, the vitreous calcium aluminate clinker, the coagulant nucleation agent, the nano hybrid siliceous material, the calcium-magnesium composite expanding agent, the self-healing agent and the hydration heat regulating agent are utilized to form a brand-new high-durability and high-adaptability quick-hardening system. The mechanical property, the volume stability and the durability are comprehensively superior to those of the traditional quick-hardening concrete.

The application provides a cement rotary kiln batching and feeding method for synergistically treating flue gas adsorbents, and relates to the technical field of cement clinker production, and comprises the following steps: sampling flue gas adsorbents for high-temperature thermogravimetric analysis, and establishing a batch fuel characteristic file; calculating a mixed equivalent calorific value according to the calorific values of new and old batches, and adjusting the mixed equivalent calorific value according to the calorific value difference gradient; sampling from a homogenizing bin discharge pipeline for high-temperature thermogravimetric analysis to obtain a measured calorific value and a real-time combustion characteristic index; comparing the measured calorific value with the calibrated mixed equivalent calorific value, and performing corresponding operations according to the deviation degree; establishing a heat load balance model to determine the optimal feeding amount of flue gas adsorbents and coal powder; determining the combustion type according to the real-time combustion characteristic index, and determining the mixing mode of flue gas adsorbents and raw materials, feeding after mixing according to the optimal feeding amount and raw materials, and simultaneously spraying coal powder into the cement rotary kiln. The scheme can improve the temperature stability of the cement rotary kiln, and realizes the recycling of flue gas adsorbents.

The application discloses a kind of solid sealing chromium composite cementitious material and preparation method thereof, solid sealing chromium composite cementitious material includes the following mass percentage of substance: 65wt.%~75wt.% of clinker with heavy metal content, 20wt.%~34wt.% of poly-element auxiliary cementitious material, the rest is gypsum;Total chromium content in clinker with heavy metal content is greater than 150mg / kg;Poly-element auxiliary cementitious material includes the following mass percentage of substance: 30wt.%~50wt.% of microbial mineralization steel slag powder, 20wt.%~40wt.% of metakaolin, the rest is fly ash;Microbial mineralization steel slag powder is prepared by carbonic anhydrase producing bacteria and steel slag powder carbon fixation grinding.The application is based on the synergistic effect between clinker with heavy metal and the overall chemical composition of poly-element composite auxiliary cementitious material, and the pH value of solidified body is reduced by secondary hydration.

The utility model discloses a novel efficient heat exchange low-pressure-loss preheater which achieves the technical effects of reducing system resistance, improving separation efficiency and reducing C1 outlet temperature by increasing the height of a volute in a gradient mode, prolonging the length of an inner barrel in a proportion mode, optimizing the structure of an air inlet pipe and improving a material scattering device. The method is particularly suitable for energy-saving transformation of a 5000t / d cement clinker production line, and has the characteristics of low investment, quick effect, lasting effect and the like.

This invention provides an ultra-high ductility cement-based composite material for marine engineering and its preparation method. The ultra-high ductility cement-based composite material comprises, by weight, the following raw materials: 250-500 parts cement clinker, 400-600 parts fly ash, 200-300 parts mineral powder, 100-150 parts silica fume, 160-240 parts metakaolin, 600-900 parts quartz sand, 10-20 parts organic synthetic fiber, 20-30 parts organic rust inhibitor, 180-240 parts water, and 1-8 parts water-reducing agent. The organic rust inhibitor provided by this invention can inhibit steel corrosion and chloride ion intrusion into concrete through the dual effects of binding chloride ions and forming a passivation film, thereby improving concrete durability. By controlling the mix proportions of the four mineral admixtures and the dosage of the synthetic fiber component, the concrete can better balance high strength, high ductility, high durability, high flowability, and excellent resistance to deformation.

The application discloses a control system and a control method for optimizing clinker cooling of a grate cooler, and aims to provide a control system and a control method for optimizing clinker cooling of a grate cooler, wherein the inside of a box body of the grate cooler is sequentially divided into multiple cooling sections according to the material flow direction, cement clinker formed after raw materials are calcined flows into the cooling sections of the grate cooler, air doors of each air cooling chamber of the cooling sections are sequentially opened to blow and cool the cement clinker, according to the air pressure and the temperature of the current cooling section, the high-pressure cooling air flow above the grate bed is opened or closed, the air pressure on both sides of the grate bed is adjusted, the cement clinker is conveyed through the grate bed in the box body from the feeding end of the grate bed to the discharging end to realize step-by-step blowing and cooling. The application automatically adjusts the air pressure on both sides in the cooling area, solves the problem that the air in the air-filled beam cannot blow through the cement clinker to form a “red river” phenomenon due to air leakage at a position with a thin material layer, and improves the clinker cooling efficiency.

This invention proposes a method for preparing cement clinker based on fluorite, belonging to the field of cement production technology. Through steps such as fluorite raw material pretreatment and particle size classification, co-grinding of fluorite and raw meal, dynamic adjustment of fluorite admixture, clinker firing, and rapid cooling to obtain the finished product, fluorite is uniformly dispersed in the raw meal system, stably exerting its mineralization effect. This can reduce the liquidus appearance temperature by 50-80℃, reduce the clinker sintering temperature by 50-100℃, significantly promote the formation and development of core strength minerals such as C3S, shorten the clinker firing time, and improve the production efficiency of the kiln system.

The utility model discloses a cement clinker calcining and decomposing device, which relates to the technical field of cement clinker production and comprises a supporting frame, a plurality of supporting rods are arranged on one side of the top end of the supporting frame, a fuel connecting cylinder is arranged at the top ends of the supporting rods, a feeding cylinder is arranged at one end of the fuel connecting cylinder, and a preheating assembly is arranged at the top end of the feeding cylinder. A fixing rod is arranged on the other side of the top end of the supporting frame, a discharging box is arranged at the top end of the fixing rod and connected with the feeding cylinder through a furnace cylinder assembly, and an exhaust pipe is arranged at the top end of the discharging box. According to the utility model, by arranging the preheating assembly, the cement raw material can be preheated, so that the cement raw material can reach the firing temperature more quickly, thereby effectively shortening the time required by calcination and decomposition, not only improving the production efficiency, but also reducing the heat consumption of clinker firing, and further improving the overall production benefit.

The utility model relates to an automatic dust cleaning structure of cement rotary kiln burner, including cement rotary kiln burner structure, is provided with air cannon automatic dust cleaning pipe fitting structure at the top of cement rotary kiln burner structure, air cannon automatic dust cleaning pipe fitting structure includes the dust cleaning main pipe set between the cylinder structure and anchor fastener at the top of cement rotary kiln burner structure, the dust cleaning spray head body structure of uniform distribution setting on the dust cleaning main pipe upper portion and the air cannon gas transmission pipeline connected in the dust cleaning main pipe rear end and the air cannon gas transmission pipeline connection air cannon generating device. This structure can clean the top dust in time in operation, reduces the dust of burner center line subsidence under the adverse environment of burner, improves the clinker section burning quality and reduces the damage of burner protection layer caused by artificial cleaning, guarantees the normal operation of burner, ensures the stable production of kiln section burning system, improves the production economic benefits.

A combustion method using a fuel combustion device, a cement manufacturing method, and a cement calcination facility including a fuel combustion device, in which while the amount of a fossil fuel used as a fuel supplied to a fuel combustion device provided in various facilities such as a cement calcination facility is reduced, the radiation heat transfer amounts of various burners are maintained, whereby the amount of heat transferred to a heating target such as a powder raw material of cement clinker is maintained to maintain a state suitable for calcination, the amount of carbon dioxide emitted from the various facilities is reduced, and the various facilities can be operated at a low cost, and a fuel combustion device including a fuel supply mechanism having a mechanism that supplies a flammable powder, a mechanism that supplies a fuel gas, and a mechanism that supplies a non-flammable powder are used.

The application discloses special cement for wind power tower drum and a preparation method thereof, and relates to the technical field of low-carbon cement. The special cement for wind power tower drum comprises the following raw materials in parts by weight: low-carbon clinker 80-89 parts, desulfurization gypsum 3-5 parts, limestone 1-5 parts, blast furnace slag 6-15 parts, reinforcing modifier 8-12 parts, shrinkage reducing agent 0.8-1.2 parts and grinding aid 0.04 parts. The reinforcing modifier is prepared by the reaction of bis(4-isocyanate phenyl) methane and polyether amine to generate polyurethane prepolymer, the reaction of the polyurethane prepolymer and 6-chloro-1-hexene to generate tetraene polymer, and the reaction of the tetraene polymer and mercaptopropyl trimethoxysilane. The special cement for wind power tower drum prepared by the application has excellent flexural strength, compressive strength and low drying shrinkage.

The invention provides a multi-source data fusion monitoring method and system for cement clinker yield, and the method comprises the steps: determining at least two real-time clinker yields based on at least two different clinker real-time yield accounting methods and obtained monitoring data of a target production line; a yield difference value of the at least two real-time clinker yields is determined, and when the yield difference value is larger than a first preset difference value, first early warning information is generated; on the basis of the material balance principle, the monthly clinker output is determined according to the monthly clinker sales volume, the monthly cement sales volume, the clinker storage period end stock, the clinker storage period initial stock and the outsourcing quantity; and determining at least two monthly cumulative yields based on the at least two pieces of real-time yield data, generating second early warning information when a difference value between the monthly cumulative yields and the monthly clinker yield is greater than a second preset difference value, and calibrating key parameters of the clinker real-time yield accounting method. The real-time performance and the accuracy of the clinker yield are considered.

The present invention relates to the technical field of cement production and in particular to a calcination system and a calcination process for low-carbon cement clinker. The calcination system comprises: a kaolin calcination assembly comprising a preheater and a decomposition furnace; wherein the preheater is provided with a multi-stage cyclone; wherein the preheater is provided with an inlet and an outlet; wherein the decomposition furnace is provided with a fuel inlet and a raw material inlet; wherein the raw material inlet is connected to the outlet; wherein the decomposition furnace calcines to produce activated kaolin; wherein the calcination temperature in the decomposition furnace is between 700°C and 850°C, the calcination time is between 0 and 1.5 hours, and the calcination atmosphere in the decomposition furnace is an oxygen-rich atmosphere or a CO reduction atmosphere.and a cement calcining unit configured for calcination to produce cement clinker; wherein the activated kaolin is added to the outlet side of the cement calcining unit in a predetermined proportion of the activated kaolin in the cement clinker. It can reduce the use of carbon-containing feedstocks in clinker production, decrease the carbon emissions of the clinker, and adjust the hydration rate of the cement clinker.

The invention discloses low-carbon cement, a production method thereof and a low-carbon cement production system, and the production method comprises the following steps: reacting and calcining a cement raw material in the presence of an iron catalyst and a carbon-containing solid to obtain the low-carbon cement. According to the scheme, through an innovative reaction mechanism, an iron catalyst and a carbon-containing solid are introduced into a cement clinker calcination system, direct reaction of calcium carbonate and carbon is realized under specific conditions by utilizing the catalytic action of iron and the reducibility of carbon, and meanwhile, energy gas such as carbon monoxide is generated, so that low-carbon and resource utilization of cement production is realized.

The application discloses a low-carbon high-performance cement clinker and a preparation method thereof, and relates to the technical field of building materials, in particular to a low-carbon cement clinker and a preparation method thereof. The raw materials in the cement clinker include the following components in percentage by weight: 75-90% of raw material, 5-20% of steel slag and 2-8% of a conditioning material, wherein the conditioning material includes at least two of lead-zinc slag, copper slag, manganese slag and lithium slag. The lead-zinc slag in the conditioning material contains 0-5.5% of ZnO in percentage by weight; the copper slag contains 0-2.0% of CuO in percentage by weight; the manganese slag contains 0-7.0% of MnO2 in percentage by weight; and the lithium slag contains 0-3.0% of Li2O in percentage by weight. The application adds the conditioning material, ensures the content of zinc, copper, manganese or lithium in the cement clinker, realizes the purposes of stabilizing R-type tricalcium silicate and improving the strength of the cement clinker, does not add components such as fluorine and sulfur which pollute the environment, is environmentally-friendly, safe and reliable, and has a wide source of raw materials and strong applicability.

The application discloses a kind of calcined coal gangue composite clinker low-carbon preparation system and preparation method based on cement production line, including cooling machine, vertical cylinder preheater, cyclone separator, prehydroxyl removal device, condenser and oil-water separator;The application proposes to use prehydroxyl removal device, combined with cooling machine to prepare composite clinker by calcining coal gangue, and the removed water does not enter the cement kiln firing system, and the prehydroxyl removal high-temperature coal gangue is calcined and activated in the cooling machine, the method is simple, has little effect on the cement kiln firing system, and the prepared calcined coal gangue active material has good quality and low cost, the coal gangue disposal amount is large, the heat value utilization rate is high, can reduce the energy consumption and carbon emission of cement industry, and has good economic benefit and social benefit.

The invention relates to the technical field of slag cement materials, in particular to low-carbon early-strength gypsum slag cement and a preparation method thereof. The low-carbon early-strength gypsum slag cement is prepared from the following components in parts by weight: 40 to 50 parts of semi-hydrated phosphogypsum, 45 to 55 parts of slag powder, 3 to 8 parts of modified metakaolin, 1 to 4 parts of quick lime, 4 to 10 parts of cement clinker, 0.2 to 0.8 part of accelerator, 0.1 to 0.3 part of water reducing agent and 0.5 to 2.5 parts of water glass, the modified metakaolin is prepared by firstly carrying out surface treatment on 3-methacryloxypropyltrimethoxysilane and then carrying out copolymerization reaction on the modified metakaolin, methyl methacrylate, modified organic silicon and methacrylamide. The low-carbon early-strength gypsum slag cement prepared by the invention not only has excellent mechanical properties, but also has excellent water resistance.

The application provides a fast-hardening early-strength high-pressure and freeze-resistant cement material and a preparation method thereof, belongs to the technical field of cement materials, and the cement material comprises silicate cement clinker, natural anhydrous gypsum, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent, a crystal bridge-pore dual functional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent is prepared by sintering, quenching and heat reaction of bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, and surface modification by KH-550. The crystal bridge-pore dual functional agent comprises a calcium silicate hydrate crystal bridge agent and a polymer-SiO2 composite elastic pore forming agent. The polymer-SiO2 composite elastic pore forming agent is prepared by shearing emulsification of an oil phase prepared from styrene, butyl acrylate, divinylbenzene and polyglyceryl-10 diisostearate and an aqueous phase prepared from deionized water, sodium dodecyl sulfate and polyethylene glycol allyl methyl ether, ammonium persulfate reaction and tetraethyl orthosilicate reaction.

The invention belongs to the technical field of building materials, and particularly relates to high-performance CFB ash clinker-free cement and a preparation method thereof. The high-performance CFB ash clinker-free cement provided by the invention is prepared from the following raw materials: a base material (CFB fly ash, ground CFB slag, S95 mineral powder, silica fume and desulfurized gypsum) and a composite modifier (calcium chloride, a polycarboxylate superplasticizer, aluminum sulfate, propyl p-hydroxybenzoate, nano silicon dioxide, nano calcium oxide, chrysotile nanofiber and hydrated magnesium silicate nanofiber). The high-performance CFB ash clinker-free cement provided by the invention does not contain clinker, does not need calcination treatment, has the advantages of early strength, high strength, micro-expansion and good durability, and also has the characteristics of prevention and reduction of cracking, greenness, energy conservation, environmental protection, high solid waste dosage utilization, low production cost and long service life.

Embodiments of the present invention disclose a cement production system, a preheating assembly of the system has a first inlet for receiving cement raw materials and a first outlet for discharging the cement raw materials preheated by the preheating assembly; a first cylinder is in communication with the first outlet to receive the preheated cement raw materials discharged from the preheating assembly, a combustion assembly is arranged on the outer wall of the first cylinder, the combustion assembly is used for heating and decomposing calcium carbonate in the cement raw materials into semi-clinker and carbon dioxide gas, the first cylinder has a second outlet for discharging the semi-clinker and a third outlet for discharging the carbon dioxide gas; a part of a sintering assembly is in communication with the second outlet to receive the semi-clinker discharged from the first cylinder and sinter the semi-clinker into clinker; a carbon capture assembly is in communication with the third outlet to receive the carbon dioxide gas discharged from the first cylinder and capture and recycle the carbon dioxide gas. The cement production system of the embodiments of the present invention significantly reduces the energy consumption of carbon capture.

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.