1377 results about "Clinker (cement)" patented technology

The invention provides an energy optimization management method for cement production, and relates to the technical field of intelligent manufacturing, and the method comprises the steps: obtaining and collecting multiple types of historical energy consumption data; storing the historical energy consumption data and historical working condition data of cement production by using a time domain alignment strategy based on a time sequence optimization structure; the historical energy consumption data, the historical working condition data and the equipment characteristic data are combined, the equipment characteristic data serve as input variables, an energy consumption prediction model is trained, and change modes of unit clinker energy consumption, grinding power consumption and vertical mill power consumption under different production working conditions are recognized through the energy consumption prediction model; a multi-target energy efficiency evaluation function is constructed based on the energy consumption prediction model, energy consumption interval clustering is carried out on full-cycle data, and different energy consumption levels are delimited; in combination with real-time working condition data and real-time energy consumption data which are collected in real time, a corresponding energy consumption level is determined, and then production parameters are dynamically adjusted through a multivariable regression algorithm. According to the invention, automatic energy optimization management in the cement production process can be realized.

The invention belongs to the technical field of cement production, and particularly discloses a cement decomposing furnace temperature field simulation method based on digital twinning, and the method comprises the steps: firstly, carrying out the preliminary selection of input parameters according to a cement clinker sintering technology, and then building a time sequence data set from a decomposing furnace; secondly, data preprocessing is carried out through mean filtering and homogenization, and a time sequence data set is divided into a training set, a verification set and a test set; establishing a deep learning model for training to obtain a digital twin virtual model layer, and establishing a decomposition furnace geometric model for training to obtain a prediction model; and carrying out anomaly detection and prediction simulation on the input decomposition furnace variables by using the two trained models. According to the method, the decomposition furnace digital twinborn model is established through the decomposition furnace mechanism model and the data driving model, so that the method has the advantages of prediction capability, operation optimization, decision support and the like, temperature distribution and dynamic change in the decomposition furnace can be reflected in real time, and abnormal conditions in operation can be found.

The invention relates to low-carbon high-durability concrete in the field of concrete. The low-carbon high-durability concrete comprises the following components in parts by weight: 30-35 parts of cement, 40-46 parts of a cementing material, 180-190 parts of coarse aggregate, 150-160 parts of fine aggregate, 4-6 parts of an air entraining and water reducing agent and 60-70 parts of water, the cementing material comprises the following components in percentage by weight: 50-55% of granulated blast-furnace slag, 5-10% of steel slag, 3-5% of desulfurized gypsum, 1-3% of tailings, 2-4% of desulfurized fly ash, 2-4% of red mud, 3-5% of a reinforcing agent and the balance of silicon hydrochloric acid cement clinker. The method has the effect of improving the durability and strength of the low-carbon concrete.

The invention provides a mining inorganic environment-friendly reinforcing material and application thereof, and belongs to the technical field of mining reinforcing materials. A component A comprises the following components in parts by mass: 60-80 parts of anhydrite, 5-20 parts of lime, 5-10 parts of silica fume, 2-8 parts of sodium silicate, 1-0.5 part of a naphthalene water reducer, 3-7 parts of an early strength agent and 0.2-0.8 part of lithium salt; the component B comprises the following components in parts by mass: 50-70 parts of cement clinker, 10-30 parts of slag cement, 5-10 parts of iron powder, 1-8 parts of aluminum sulfate, 5-10 parts of calcium carbonate and 0.5-1 part of sodium tripolyphosphate; the component C is prepared from the following components in parts by mass: 10 to 25 parts of water glass, 10 to 20 parts of emulsion, 40 to 60 parts of water, 5 to 10 parts of high-efficiency water reducing agent and 1 to 5 parts of triethanolamine. The mining inorganic environment-friendly reinforcing material provided by the invention is low in reaction heat and is not easy to cause coal combustion.

The invention provides an ultrahigh-ductility cement-based composite material for ocean engineering and a preparation method of the ultrahigh-ductility cement-based composite material for ocean engineering. The concrete is prepared from the following raw materials in parts by weight: 250 to 500 parts of cement clinker, 400 to 600 parts of fly ash, 200 to 300 parts of mineral powder, 100 to 150 parts of silica fume, 160 to 240 parts of metakaolin, 600 to 900 parts of quartz sand, 10 to 20 parts of organic synthetic fiber, 20 to 30 parts of organic corrosion inhibitor, 180 to 240 parts of water and 1 to 8 parts of water reducing agent. The organic corrosion inhibitor provided by the invention can be combined with chloride ions to form a passive film, so that the corrosion of reinforcing steel bars and the invasion of the chloride ions into concrete are inhibited, and the durability of the concrete is improved; by regulating and controlling the mixing ratio of the four mineral admixtures and the mixing amount of the synthetic fiber component, the concrete can well consider high strength, high ductility, high durability, high flow state and excellent deformation resistance. The ultrahigh-ductility concrete for ocean engineering, which can meet the toughness requirements of high compression resistance, fracture resistance and impact resistance and the requirements of high chloride ion permeation resistance and steel bar corrosion resistance, can be obtained.

The invention belongs to the technical field of new building materials, and provides a low-alkalinity and early-strength ardealite filling and curing material and a preparation method thereof.The low-alkalinity and early-strength ardealite filling and curing material is prepared from ardealite, a curing agent and water, the curing agent comprises silica fume, limestone powder, superfine granulated blast furnace slag powder, metakaolin, calcium aluminate powder, Portland cement clinker powder, a suspension stabilizer and hydroxypropyl methyl cellulose ether. The problems of delayed coagulation, low early strength and high alkalinity of a common cement-based ardealite filling material can be solved, and the technical requirements of ardealite cemented filling are met.

The invention relates to the technical field of cement materials, in particular to a red-mud-containing steel slag composite cementing material and a preparation method thereof.The method comprises the steps that red mud, slag, steel slag, desulfurized gypsum and sulphoaluminate cement clinker are subjected to dry mixing to obtain an initial mixture; determining whether the excitation capability of the potential hydration activity reaches the standard or not based on the alkaline matching index, and adjusting the weight part of the sulphoaluminate cement clinker; adding a composite exciting agent to obtain activated slurry; determining whether the dispersion effect of the flocculation structure of the initial mixture is qualified or not based on the dispersion index of the flocculation structure, and adjusting the ball milling rotating speed; adding a polymer emulsion to obtain an initial composite cementing material; determining whether the synergistic enhancement effect of the polymer emulsion and the activated slurry is qualified or not based on the synergistic enhancement index, and adjusting the dripping rate of the polymer emulsion; the steel slag composite cementing material containing the red mud is obtained. The preparation stability of the red mud-containing steel slag composite cementing material is improved.

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 belongs to the field of grouting materials, and discloses a composite grouting material as well as a preparation method, a construction method and application thereof. The composite grouting material comprises the following components: sulphoaluminate cement clinker powder, Portland cement clinker powder, a reinforcing agent, a coagulant and a modifier, the reinforcing agent comprises superfine mineral powder, superfine fly ash, silica fume and calcium sulfate whiskers; the coagulant comprises alumina clinker powder, calcium hydroxide, lithium carbonate and aluminum hydroxide; the modifier comprises a shrinkage reducing agent, a thickening agent, a water reducing agent and a retarder. The composite grouting material has the advantages of being good in pumpability, short in gelation time, free of plastic shrinkage, high in early strength, good in volume stability, high in durability, appropriate in price, environmentally friendly, free of toxicity and the like, and the requirement for rapid grouting maintenance is met in the subway operation window period.

The invention provides a lithium slag-based cementing material and a preparation method thereof. The preparation method of the lithium slag-based cementing material comprises the following steps: carrying out water washing dealkalization treatment on lithium slag; carrying out chemical excitation on the lithium slag subjected to water washing and dealkalization, and drying; grinding and activating the dried lithium slag to obtain pretreated lithium slag; mixing the pretreated lithium slag, industrial solid waste, cement clinker and an exciting agent in proportion to form a lithium slag-based cementing material; wherein the content of the pretreated lithium slag is [30%, 60%] in percentage by mass. The problems of low hydration activity, high alkali content, large component fluctuation and the like of the lithium slag are solved through pretreatment of water washing dealkalization, chemical excitation and mechanical activation of the lithium slag, and recycling, high-performance and harmless utilization of the large-mixing-amount lithium slag in the process of preparing a cementing material is achieved. And moreover, the lithium slag-based cementing material is used for replacing Portland cement, so that the CO2 emission is reduced while the lithium slag solid waste is recycled.

The invention relates to the technical field of cement-based pavement patching materials, and particularly discloses an aluminoferrite cement-based concrete pavement patching material as well as a preparation method and application thereof. The repairing material is prepared from the following raw material components in parts by weight: 25 to 45 parts of iron aluminate cement clinker, 2 to 5 parts of Portland cement clinker, 5 to 15 parts of composite gypsum, 2 to 4 parts of calcium sulphosilicate, 2 to 4 parts of vaterite, 10 to 25 parts of mineral powder, 40 to 50 parts of fine aggregate, 0.05 to 0.25 part of triisopropanolamine or diethanolisopropanolamine, 0.75 to 1.5 parts of calcium formate and 0.5 to 1.0 part of sulfate. The strength of the repairing material can be improved in the whole age, the freeze-thaw resistance is improved, and the repairing material has good bonding strength with the pavement.

The utility model discloses a medium-temperature low-dust denitration device suitable for cement clinker production line flue gas, which comprises a dust removal denitration tower, and the dust removal denitration tower is composed of a gas inlet flue, a dust hopper, a filter chamber, a gas purification chamber, a reducing gradually-shrinking connecting flue and a denitration reactor which are communicated in sequence; a dust removal cloth bag is arranged in the filter chamber, a filter bag ash removal mechanism is arranged in the gas purification chamber, a rectification grid is arranged in the reducing and gradually-shrinking connecting flue, and a high-temperature catalyst layer is arranged in the denitration reactor; according to the dedusting and denitration tower provided by the invention, the dedusting and denitration tower is characterized in that a connecting flue of a deduster and a denitration reactor adopts a reducing and gradually-shrinking connecting flue structure, so that on one hand, a flue gas flow field entering a first-layer catalyst of the denitration reactor is obviously uniform, and the denitration effect is obviously improved; on the other hand, the construction cost is also obviously reduced; the device is simple in structure, convenient to operate and worthy of popularization.

The invention discloses carbonized and activated steel slag, a preparation method and application of the carbonized and activated steel slag in preparation of cement clinker. The preparation method of the carbonized and activated steel slag comprises the following steps: activating steel slag by adopting an activating solution, adjusting the pH value to 7-8 after first stirring, and then performing second stirring, filtering, washing, drying, grinding and sieving to obtain the activated steel slag, and carbonizing the activated steel slag to obtain carbonized activated steel slag. The steel slag is subjected to chemical treatment and CO2 curing synergistic treatment, so that the existence form of CaO in the steel slag is changed into a unit from multiple elements, the existence form of CaO is optimized, the complex chemical composition of the steel slag is simplified, and the steel slag replaces limestone to serve as a raw material for calcining the cement clinker, so that the utilization rate of the limestone is reduced, and the utilization rate of the steel slag in the field of building materials is increased; the performance of the cement is also effectively improved.

The invention discloses an ion doping method based on first principle calculation and application thereof. Relates to the technical field of building materials. The method comprises the following steps: firstly, constructing a cement clinker mineral phase crystal structure model, and performing structural relaxation on the model to obtain a model crystal structure with a determined lattice constant; secondly, analyzing and optimizing microstructure changes and corresponding energy state changes of various mineral phases in the ion doping process by utilizing a quantum mechanical simulation means, representing the solid solubility of doped ions and mineral phase structures through the defect formation energy of ion doping, forming energy being negative reaction process being spontaneous process, the closer to 0, the better the solid solubility, and the more to 0, the better the solid solubility; therefore, how to enhance the hydration reaction activity and improve the strength by ion doping is disclosed. The mechanical property, durability and corrosion resistance of the cement are improved by accurately regulating and controlling the characteristics of the multi-mineral-phase structure.

The invention relates to the technical field of building materials, and discloses cement containing sulfonic acid cellulose and a preparation method thereof.The preparation method includes the steps that gypsum, coal gangue and Portland cement clinker are smashed and added into a concrete mixer to be stirred, then sulfonic acid cellulose, kieselguhr, calcium formate and quaternary ammonium salt modified polyurethane are added into the concrete mixer to be stirred, and the cement containing sulfonic acid cellulose is obtained; the cement containing the sulfonic acid cellulose is obtained. The cement containing sulfonic acid cellulose provided by the invention has better crack resistance, durability and good mechanical properties.

The invention discloses a high-efficiency coal-saving agent for cement clinker firing and a preparation process and application thereof. The coal saving agent comprises the following components in parts by weight: 10-20 parts of a penetrating agent, 7-15 parts of a dispersing agent, 20-25 parts of a catalyst, 9-13 parts of a swelling agent, 30-48 parts of a heat supply agent and 60-70 parts of hydrogen peroxide. Wherein the heat supply agent is powder formed by solidifying aluminum powder, iron oxide powder, magnesium powder and glass powder, and the mass ratio of the aluminum powder to the iron oxide powder is 1: (4-7). The magnesium powder accounts for 12-20% of the total mass of the aluminum powder and the iron oxide powder. The glass powder accounts for 14-16% of the total mass of the aluminum powder and the iron oxide powder. The coal saving agent not only can effectively reduce the use amount of coal, but also has a sulfur fixation effect, so that the emission of sulfur oxide gas is reduced.

The invention relates to a device (50) for determining the hardness (H) of cement clinker (ZK) in a cement plant (20) by evaluating an acoustic signal (AS) upon impact of the cement clinker on a substrate (12) after leaving a rotary kiln (9), a cement plant with such a device, a corresponding method (200) using this device, and a data carrier (300) with a software program (301) stored thereon for installation in an evaluation unit (70) of such a device for at least partially carrying out such a method.In the cement plant, the cement clinker falls from the rotary kiln onto a base and sets it into vibration upon impact, resulting in an acoustic signal (AS) characteristic of the respective hardness, comprising at least one frequency distribution (FV) or frequency-time distribution (FZV) or time signal (ZV) characteristic of the hardness, wherein the device (50) comprises one or more sensors (60) and an evaluation unit (70), wherein the sensors (60) are provided to record the respective acoustic signal (AS) and the evaluation unit (70) is provided to determine at least the hardness (H) of the cement clinker (ZK) from the recorded frequency distribution (FV) or the recorded frequency-time distribution (FZV) or the recorded time signal (ZV).

A conveying device for conveying bulk material for a plant for producing cement clinker, wherein the plant for producing cement clinker operates in the recirculation process and / or in the oxy-fuel process, and wherein the conveying device has a connection to the plant, in which the bulk material to be transported passes into the plant. The connection between the conveying device and the plant for producing cement clinker has a gas supply for pressurizing the connection with recirculation gas. Also a method.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The invention relates to the technical field of cement chemical component analysis, and discloses a cement raw material proportion optimization method and system, and the method comprises the steps: determining a target compressive strength value based on the chemical component proportion of a cement raw material; obtaining a first chemical component combination before optimization of the cement clinker matched with the target compressive strength value from a preset cement ratio database; according to the first chemical component proportion combination, the preset value range of different chemical components of the cement clinker and the preset constraint condition, iterative optimization is conducted through the genetic algorithm, and an optimized second chemical component combination is obtained. The method has the advantages that data deviation between laboratory conditions and actual production is avoided by optimizing the clinker component proportion combination through the cement proportion and the genetic algorithm, the optimal cement clinker component combination is found under the constraint of a plurality of performance indexes, and during the application process, when the cement raw material proportion is analyzed on the basis of the optimized cement clinker proportion, the optimal cement clinker component combination is obtained. And the accuracy of component analysis of the cement raw material is effectively improved.

The invention relates to the technical field of cement production and manufacturing, aims at solving the problems that an existing grinding system is single in function and cannot have multiple cement grinding processes at the same time, and provides a composite multi-process cement grinding system and process and a cement production method. Wherein the composite multi-process cement grinding system comprises a roller press grinding system and a ball mill grinding system, and the composite multi-process cement grinding process comprises three grinding processes, namely a combined grinding process, a semi-final grinding process and a final grinding process; the cement production method comprises the following steps: separately grinding clinker and a mixed material by using two sets of cement grinding systems, and then mixing by using a mixing system to obtain a finished product. According to the invention, the limitation of a single grinding system is broken through, the operability of the system is improved through an ingenious switching means, and the advantages and functions of production through one system and coexistence of multiple technological processes are realized.

The invention relates to the technical field of civil engineering, in particular to coal gangue-based low-carbon cement with high chloride ion permeability resistance and a preparation method of the coal gangue-based low-carbon cement. The cement comprises the following components in parts by weight: 30-50 parts of cement clinker; 30 to 50 parts of coal gangue; 5-15 parts of an aluminum-rich mineral correction material; 10-20 parts of a carbonate filler; 10 to 15 parts of fine aggregate; 5-10 parts of a sulfate component; 0.4 to 0.8 part of a performance improver; the carbonate filler is prepared from styrene acrylate emulsion modified limestone powder, shell powder and magnesite tailings. The cement provided by the invention has excellent high chloride ion permeability resistance, and the toughness and strength of the cement are also improved greatly.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The invention relates to sulfur silicate cement and a preparation method thereof. Relates to the technical field of cement. Comprising sulfur silicate clinker, gypsum, a mixed material and a performance adjusting component, the sulfur silicate cement comprises the following components in parts by mass: 50-90 parts of sulfur silicate clinker, 4-25 parts of gypsum, 5-50 parts of a mixed material and 0-5 parts of a performance adjusting component. The mineral composition of the sulfur silicate clinker is as follows: 15 to 50 weight percent of calcium sulphoaluminate, 5 to 50 weight percent of calcium sulphosilicate, 10 to 70 weight percent of dicalcium silicate, 2 to 15 weight percent of free gypsum and 0 to 2 weight percent of free lime; the 45-micron screen residue of the sulfur silicate clinker is less than or equal to 25%. According to the invention, under the condition that the mineral composition of the sulfur silicate clinker is changed, the hydration degree of the clinker is improved and the consumption of the clinker is saved by compounding the proper gypsum and the admixture, the clinker coefficient can reach 0.5-1, and the cement cost and carbon emission are effectively reduced.

The bypass ventilation system comprises an air taking opening formed in a smoke chamber, a quench cooler, a cyclone dust collector, a bag dust collector, an ash bin and a pneumatic conveying device. The quench cooler adopts a volute structure, and an air inlet port of the quench cooler is connected with a quench fan; high-temperature flue gas passing through the quench cooler enters the cyclone dust collector, coarse particles in the flue gas are returned to the decomposing furnace by the cyclone dust collector, and relatively coarse particles are returned to the kiln tail, so that partial material consumption and heat consumption are reduced; fine particle dust separated by the cyclone dust collector enters a cloth bag dust collector to be collected, and clean air is directly discharged into a kiln tail chimney through an exhaust fan; ash collected in the cloth bag dust collector is firstly conveyed into the ash bin, and then the ash is conveyed to the steel bin at the clinker conveying belt or conveyed to the ash temporary storage bin of the water washing workshop and then is subjected to water washing. According to the bypass ventilation system, the skinning problem can be effectively relieved, and stable operation of a production line is guaranteed; and the quality of the cement is ensured.

The invention discloses an anti-erosion Al2O3-SiC-C slag runner castable containing pyrophyllite and a preparation method of the anti-erosion Al2O3-SiC-C slag runner castable, and belongs to the technical field of refractory materials. The Al2O3-SiC-C slag trough castable is mainly prepared from the following raw materials in percentage by mass: 30 to 45 percent of high-alumina clinker, 20 to 35 percent of pyrophyllite, 8 to 15 percent of silicon carbide, 5 to 10 percent of kyanite, 5 to 10 percent of graphite electrode powder, 3 to 6 percent of active Al2O3 micro powder, 2 to 4 percent of silicon micro powder, 1.5 to 2.5 percent of antioxidant, 3 to 5 percent of pure calcium aluminate cement and 1.5 to 2.5 percent of asphalt. In addition, explosion-proof fibers accounting for 0.03-0.15% of the total weight of all the raw materials and a water reducing agent accounting for 0.05-0.15% of the total weight of all the raw materials are added. The anti-erosion Al2O3-SiC-C slag runner castable is prepared by mixing the weighed raw materials uniformly and then obtaining the anti-erosion Al2O3-SiC-C slag runner castable. The Al2O3-SiC-C slag runner castable prepared by the method can completely meet the requirements of the use performance of the Al2O3-SiC-C slag runner castable, and the Al2O3-SiC-C slag runner castable can be well applied to a blast furnace casting house; meanwhile, the cost is reduced, and remarkable social benefits and economic benefits are achieved.

The invention discloses a cement kiln thermotechnical diagnosis analysis method and system based on heat balance calculation, and relates to the field of cement kiln thermotechnical diagnos.The analysis method comprises the steps that a corresponding heat balance state is calculated by obtaining cement kiln thermotechnical parameters and material component data, the material balance relation between the material input quantity and the material output quantity of the cement kiln is analyzed; evaluating the energy utilization efficiency of the cement kiln firing system by taking the ratio of the cement kiln clinker formation heat to the input total heat as a thermal efficiency index, and generating a diagnostic index by combining a thermal balance state and a material balance relationship; and comparing the diagnosis index with a historical operation optimal value to determine a deviation condition, evaluating heat loss abnormity and an operation state of the cement kiln thermotechnical engineering according to the deviation condition, constructing a causal atlas to predict a development trend of the cement kiln thermotechnical engineering, and obtaining a cement kiln combustion control result. The method can help to understand how each factor affects the overall performance of the thermal system, and facilitates the optimization and adjustment of different parameters according to the causal relationship in the later stage.

The invention relates to a low-carbon high-performance cement clinker and a preparation method thereof. Relates to the technical field of building materials, in particular to a low-carbon cement clinker and a preparation method thereof. The cement clinker comprises the following raw material components in percentage by weight: 75-90% of a raw material, 5-20% of steel slag and 2-8% of a tempering material, and the tempering material comprises at least two of lead-zinc slag, copper slag, manganese slag and lithium slag. The weight percentage of the lead-zinc slag in the tempering material is 0-5.5% according to the oxide ZnO; the weight percentage content of the copper slag is 0-2.0% based on the oxide CuO; the weight percentage of the manganese slag is 0-7.0% in terms of oxide MnO2; and the weight percentage content of the lithium slag is 0-3.0 wt% according to the oxide Li2O. The tempering material is added, the purposes of stabilizing R-type tricalcium silicate and improving the strength of the clinker are achieved by guaranteeing the content of zinc or copper or manganese or lithium in the clinker, components such as fluorine and sulfur which pollute the environment are not additionally added, the clinker is environmentally friendly, safe and reliable, and the used raw materials are wide in source and high in applicability.

The invention provides a method and a system for preparing low-carbon cement by grading gradient utilization of coal gasification ash. The method comprises the following steps: dividing the coal gasification ash into carbon-rich ash, medium-carbon ash and carbon-poor ash according to the carbon content; feeding the carbon-rich ash and feed coal into a pulverized coal preparation workshop to prepare a first mixture serving as clinker calcination fuel; metering the medium-carbon ash residue, feeding the medium-carbon ash residue and other raw material components into a raw material preparation workshop, and grinding and drying; decomposing and calcining the uniformly mixed second mixture, and cooling to obtain clinker; and feeding a mixture of the clinker, other cement components and carbon-poor ash into a cement preparation workshop to prepare finished cement. Coal gasification ash materials with different characteristics are obtained by grading the carbon content of the coal gasification ash, and are respectively used in three process sections of cement raw material grinding, clinker calcining and cement grinding in combination with the characteristics of a cement production process, so that the coal gasification ash realizes large-dosage and large-scale utilization in the aspect of building material resources; the carbon emission in the cement clinker production process is reduced.

The invention provides a composite mineral admixture based on iron ore tailing mud and a preparation method thereof, and the composite mineral admixture comprises the following raw materials by weight: 30-40 parts of activated iron ore tailing mud, 5-10 parts of layered ultrafine powder, 5-10 parts of a methacrylic acid-cellulose copolymer, 5-7 parts of limestone powder, 1-3 parts of a composite grinding aid, and 1-3 parts of a composite activator. According to the composite mineral admixture disclosed by the invention, the mixing amount of the composite mineral admixture in cement can be increased to the maximum extent, the use amount of cement clinker is reduced, the production cost of the cement is reduced, the composite cement has more excellent mechanical properties, volume stability and durability, and the composite mineral admixture plays a role similar to a crystal nucleus effect in a cement hydration process; and meanwhile, the hydration products tend to be uniformly distributed in the whole interface transition area, the hydration products with better stability are generated, and the anti-permeability performance is improved.