817 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 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 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 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 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 present invention discloses a high-concentration carbon dioxide capture system built on a cement kiln system and a low-carbon emission type cement clinker production line. Among them, the high-concentration carbon dioxide capture system includes a first decomposing furnace, a preheater assembly, a first gas-solid separator, a second decomposing furnace device, and a second gas-solid separator; the feed end of the first decomposing furnace is connected to the discharge end of the preheater assembly, and the intake end of the first decomposing furnace is connected to the cement kiln system; the inlet end of the first gas-solid separator is connected to the outlet end of the first decomposing furnace, the discharge end of the first gas-solid separator is connected to the second decomposing furnace device, and the outlet end of the first gas-solid separator is connected to the intake end of the preheater assembly; the inlet end of the second gas-solid separator is connected to the second decomposing furnace device. The low-carbon emission type cement clinker production line includes a cement kiln system, a high-concentration carbon dioxide capture system, and a carbon monoxide generation system that are connected to each other. The present invention effectively realizes the series connection and circulation of the production of cement clinker, carbon dioxide, and carbon monoxide.

The application discloses a method for preparing auxiliary cementitious material and concrete products by carbonizing steel slag with industrial kiln tail gas, and steps are as follows: original steel slag is crushed, iron is removed, and screening is performed, so that a steel slag coarse-fine aggregate mixture and steel slag fine powder are obtained; the steel slag coarse-fine aggregate mixture is carbonized to obtain carbonized coarse aggregate and carbonized fine aggregate; the steel slag fine powder is ground to obtain steel slag micro-powder, the steel slag micro-powder is made into a cake to obtain a steel slag cake; the steel slag cake is subjected to carbonization treatment, and then is dried and ground to obtain a steel slag-based auxiliary cementitious material; the steel slag-based auxiliary cementitious material, silicate cement clinker powder and gypsum powder are mixed to obtain a new low-carbon cementitious material; the carbonized coarse aggregate, the carbonized fine aggregate, the new low-carbon cementitious material and sand are mixed and pressure-formed, and are subjected to carbonization treatment, so that a steel slag multi-stage carbonized product is obtained. The application effectively improves the carbonization rate and carbonization strength through the multi-stage carbonization technology, and avoids the occurrence of uneven carbonization caused by the fact that CO2 carbonization cannot reach the inside of particles.

The invention relates to the technical field of cement preparation, and particularly discloses dry-process clinker cement and a preparation process thereof. The dry-process clinker cement comprises the following raw materials in parts by weight: 180-200 parts of limestone; 30-50 parts of iron tailing powder; 20 to 30 parts of coal gangue; 10 to 20 parts of fly ash; 5-8 parts of calcium fluoride; 5-8 parts of nano silicon dioxide; 1-5 parts of nano calcium carbonate; 1-5 parts of sodium sulfide; 1-5 parts of a charcoal-ferrous sulfate loading material; 100 to 200 parts of water; 5-20 parts of a sintering aid; the biochar-ferrous sulfate loading material is obtained by loading ferrous sulfate on biochar particles. According to the dry-process clinker cement disclosed by the invention, the reduction activity and chromium removal efficiency of the ferrous sulfate can be effectively enhanced through the charcoal-ferrous sulfate loading material, so that hexavalent chromium in the cement can be efficiently removed by using a relatively small amount of ferrous sulfate, and the cement can keep relatively good compressive strength while the cost is reduced.

The invention discloses low-hydration-heat iron aluminate cement and a preparation method thereof, and belongs to the technical field of maritime work cement, and the low-hydration-heat iron aluminate cement comprises 70-85 parts of iron aluminate cement clinker, 5-7 parts of a bio-based retarder, 4-8 parts of a nano friction regulator, 3-4.5 parts of a microcapsule dual repair agent, 5-10 parts of gypsum and 15-25 parts of a mixed material. The fucoidan polysaccharide sulfate and calcium ions in a cement hydration product form a complex through sulfate groups in molecules of the fucoidan polysaccharide sulfate, and further hydration of cement particles is prevented, so that the early heat release rate is effectively reduced, temperature cracks are prevented from being generated in a concrete structure, and the stability and durability of the structure are improved. According to the microcapsule dual-repairing agent, the problem of delayed volume expansion of the steel slag powder caused by fluctuation of the content of free calcium oxide is effectively solved through the matching effect of the inner-layer repairing agent and the outer-layer carrier. According to the gradient clinker sintering process, mineral distribution and chemical reaction paths in clinker are optimized, so that the generation amount of cement hydration heat is remarkably reduced, and meanwhile, the thermal stability of slurry is improved.

The invention discloses a desulfurizing agent for a cement kiln as well as a production method and application of the desulfurizing agent. The desulfurizing agent is prepared from the following raw material components in percentage by weight: 88-96 wt% of limestone; 2-6 wt% of an iron raw material; 1-6 wt% of gypsum; and 0-4 wt% of a silicon-aluminum material. The desulfurizer is produced by utilizing a kiln line of a cement enterprise, is dried and ground with raw materials according to a mass ratio of 1: 100 to 3: 100, and then is put into a cement kiln system for cement clinker production, so that the emission concentration of sulfur oxides in kiln tail flue gas produced by sulphoaluminate cement clinker can be reduced from more than 2000mg / Nm < 3 > to less than 35mg / Nm < 3 >; and for other types of cement clinker, the content of the cement clinker can be reduced from 1000 mg / Nm < 3 > or above to 35 mg / Nm < 3 > or below, the desulfurization effect is stable, and the environment-friendly emission requirement can be continuously met.

This invention discloses a high-early-strength, low-shrinkage composite silicate cement and its preparation method, comprising: low-shrinkage silicate cement clinker, early-strength component, and gypsum component; the low-shrinkage silicate cement clinker is prepared from calcareous raw materials, siliceous-aluminous raw materials, ferrous raw materials, a first activator, and a mineralizer; its mineral composition includes: C3S 30-50 parts, C2S 20-40 parts, C3A 0.5-5 parts, and C4AF 10-25 parts; its particle size distribution characteristics are D10≥5μm, D90≤45μm, uniformity index of 1.2-1.6, and characteristic particle size of 25-30μm; the early-strength component is prepared from F-type fly ash or C-type fly ash, limestone, magnesium oxide, and a second activator; its mineral composition includes: C 20 A 13 M3S 350-65 parts, C2S 35-50 parts. The cement prepared by this invention not only has high early strength, but also has a small drying shrinkage rate.

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 invention relates to the technical field of building engineering materials, in particular to an inorganic grouting material with adjustable curing time and a use method thereof. The inorganic grouting material provided by the invention comprises a main material and an adjusting material, the main material comprises the following components in parts by mass: 50-70 parts of sulphoaluminate cement clinker, 10-20 parts of quartz powder, 10-20 parts of gypsum, 3-5 parts of nano volcanic ash, 0.5-1 part of a water reducing agent and 0.1-1.5 parts of a retarder; the adjusting material comprises a composite coagulant and hydroxypropyl methyl cellulose. Through innovation of a material formula and innovation of a construction process, the problem that the grouting effect is poor due to the fact that a traditional grouting material cannot change the solidification time according to variable underground grouting scenes and requirements is solved; accurate grouting can be achieved under the conditions of different grouting depths, different crushing degrees, different diffusion radiuses, different mixing water temperatures, different coal and rock mass temperatures, different water inflow and the like.

The invention discloses a sprayable ECC for early-strength tunnel repair and a preparation method thereof. The sprayable ECC comprises the following components in parts by mass: 300-380 parts of Portland cement clinker, 25-40 parts of silica fume, 30-50 parts of superfine slag, 100-150 parts of quartz sand, 5-15 parts of a polycarboxylic acid water reducer, 5-10 parts of a nano CSH crystal nucleus suspension, 5-15 parts of mixed fibers, 0.4-1.2 parts of a polyether defoamer and 10-16 parts of an accelerator. And 72-92 parts of tap water. The jettable ECC has the technical requirements of ultrahigh early strength, ultrahigh ductility and jettable performance.

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 invention relates to a component, device and process for a comparative cement-based sample for detecting the activity index of slag powder. The base sample includes the following weight ratios of each component: Portland cement clinker: citric acid slag: limestone: volcanic rock: fly ash: cement modifier = 24: 1.5: 1.8: 1.5: 1.2: 0.009; the attached moisture content of each group is less than 0.2%; Portland cement clinker: the content of C3S + C2S is 75.5% ± 0.5%, f-CaO: ≤ 1.0%, loss on ignition ≤ 1.0%, alkali content ≤ 0.6%, 3-day compressive strength ≥ 30 MPa, 28-day compressive strength ≥ 55 MPa; citric acid slag: SO3 content is 45% ± 1%; the present invention is reasonably designed, compact in structure and convenient to use.

The invention discloses a concrete admixture and a preparation method thereof, and relates to the technical field of building materials, and the admixture is composed of a polycarboxylate superplasticizer, sulphoaluminate cement clinker, sodium silicate, N-methylethanolamine, modified nano-silica, a retarder and hyaluronic acid according to a specific proportion. The preparation method comprises the key steps of premixing, compounding, clinker adding, pH and temperature adjusting, low-temperature ultrasonic doping of hyaluronic acid, homogenizing, filtering, packaging and the like. According to the admixture disclosed by the invention, through the synergistic effect of all the components, the quick-setting and early-strength performance of concrete is remarkably improved, the injection rebound rate is effectively reduced, and the compressive strength, the anti-permeability grade and the freezing resistance are greatly improved. The admixture is especially suitable for recycled aggregate concrete, supports replacement of 20-50% of recycled aggregate through matched aggregate pretreatment and fly ash compounding, and has significantly improved strength. The coating has excellent temperature adaptability, construction performance and storage stability.

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 provides a method for extracting vanadium by negative pressure roasting of dolomite and acid leaching of vanadium slag, and belongs to the technical field of resource recovery, the method comprises the following steps: crushing the vanadium slag, the dolomite and the vanadium slag to a certain particle size, mixing according to a certain proportion, and pelletizing; carrying out negative pressure roasting on the pellets by adopting a closed furnace to obtain roasted clinker and carbon dioxide; leaching and trapping the carbon dioxide through a calcium-containing aqueous solution to prepare light calcium carbonate; the roasted clinker is leached through sulfuric acid, and a vanadium-containing solution and leaching residues are obtained after leaching; extracting the vanadium-containing solution to prepare vanadyl sulfate; and carrying out magnetic separation on the leaching residues to obtain magnetite, and taking residual tailings as a cement raw material. According to negative pressure roasting, the normal pressure calcification roasting temperature is reduced, the cost is greatly saved, meanwhile, an iron component in the vanadium slag is converted into magnetic ferroferric oxide, the utilization rate of iron is increased, in addition, carbon dioxide enrichment is achieved through the closed furnace, a light calcium carbonate product is prepared through trapping and mineralization, and full-quantization high-value utilization of the vanadium slag component is achieved.

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 relates to a portland cement product for negative temperature and application thereof, in particular to application of a negative temperature product containing portland cement clinker and an anti-freezing agent in preparation of a negative temperature product capable of maintaining mechanical properties under a negative temperature condition. According to the present invention, the negative temperature environment applicability is strong, the temperature range of the conventional winter construction can be reached, the rapid strength development rate can be maintained in the negative temperature environment, the hydration heat release peak is advanced by 2-3 h, the construction requirement without the external heat source can be met, the hydration product mainly comprises ettringite and C-S-H, and the foundation is established for the cement product strength. The adopted mixing solution not only can prevent freezing, but also can accelerate coagulation. On one hand, the anti-freezing agent is added into the water, so that the vapor pressure of the water is changed, and the freezing point of the solution is reduced; and on the other hand, the anti-freezing agent contains a component for promoting hydration of the sulfur silicate cement, so that the sulfur silicate cement can be rapidly hydrated under a negative temperature condition, and the purposes of rapid setting and hardening and strength improvement of a cement product are achieved.

The invention discloses a cement mortar reinforcing agent and a preparation method thereof, relates to the field of cement mortar reinforcing agents, and is characterized in that the limit ranges of the DEAIPA dosage (15-20 parts), the titanate coupling agent hydrolysis time (3-5 hours) and the main mixing reaction temperature (60-70 DEG C) are controlled. A titanate coupling agent is hydrolyzed at specific pH and temperature until the conversion rate of-SiOR groups is high, sodium polyacrylate adsorbs sodium bicarbonate to form CO2-loaded microspheres, then the CO2-loaded microspheres are mixed and reacted with raw materials such as calcium formate and DEAIPA at limited temperature, and finally the reinforcing agent is prepared. Ten groups of contrast experiments are designed for verification: 1-5 groups are conventional groups with parameters within a limited range, 6-9 groups are control groups with parameters exceeding the range, and 10 groups are traditional raw material blank groups. Experiments show that the 3-day / 28-day compressive strength and the total shrinkage rate of a conventional group are remarkably superior to those of an out-of-range group and a blank group, a nonlinear relation exists in the synergistic effect of parameters, and it is proved that the limited range has practical significance for improving the mechanical property and the crack resistance of the low-clinker cement.

The invention discloses a condensation solar cement calcining kiln with a heat storage function and a working method thereof, and belongs to the field of energy and building material production, the condensation solar cement calcining kiln comprises a solar condenser, a cement calcining kiln, a solid heat storage material, a circulating heat release unit and a system control device, the solar condenser focuses solar energy through a daylighting opening of the cement calcining kiln, and cement clinker sintering is achieved; low-temperature gas discharged from the calcining kiln enters the raw material preheating tank to provide raw material preheating heat; the solid heat storage material in the kiln cavity absorbs sunlight and raw material radiant heat to store heat; when solar irradiation fluctuates, the circulating heat release unit enables air to exchange heat with a heat storage material, and high-temperature air required by continuous calcination is provided; the system control device regulates and controls the position, temperature and reaction process of the kiln body. Through integration of light condensation, heat absorption and heat storage, calcination of the zero-carbon cement is achieved, high-temperature CO2 gas and high-temperature air in the calcination process can be used for preheating raw materials, and gradient utilization of solar energy is achieved.

The invention discloses high-durability aluminoferrite cement-based self-compacting concrete and a preparation method thereof, and belongs to the technical field of maritime work concrete.The high-durability aluminoferrite cement-based self-compacting concrete is prepared from 60-70 parts of freeze-thaw-resistant clinker, 20-30 parts of chlorine-resistant steel slag micro powder, 8-13 parts of high-strength corrosion-resistant desulfurized gypsum, 0.8-1.3 parts of an additive, 88-124 parts of coarse aggregate, 76-116 parts of fine aggregate and 22-38 parts of water. According to the freeze-thaw-resistant clinker, the freezing resistance of concrete is enhanced by reducing the porosity and the pore diameter. The desulfurized gypsum subjected to crystal form regulation and control enhances the sulfate corrosion resistance of the concrete. The PAA / QCS-CA hydrogel enables the early strength of the concrete to be rapidly increased, accelerates the construction progress, and ensures that the airport pavement can be rapidly put into use. The high-strength corrosion-resistant desulfurized gypsum can promote early hydration of the cement and improve the early strength.

The application relates to a cement rotary kiln control parameter optimization method, which comprises the following steps: firstly, obtaining each target bit number data type related to the cement f-CaO content under the target cement rotary kiln working state; then, obtaining each to-be-referenced optimal control parameter vector based on a vector composed of each target bit number data type data value at each to-be-analyzed time point; then, obtaining the to-be-referenced optimal control parameter vector with the highest similarity to the current vector in each to-be-referenced optimal control parameter vector based on a current vector composed of the data values of each target bit number data type of the target cement rotary kiln under the current working state, and forming a target optimal control parameter vector; finally, adjusting each target bit number data type corresponding to the current working state of the target cement rotary kiln with the target optimal control parameter vector as the target; in this way, the working condition gradually approaches or reaches the historical best level, so that the output and quality of the clinker are effectively improved.

The invention relates to the technical field of building materials, in particular to a shotcrete coagulating early strength agent and a preparation method thereof. Comprising the following components in percentage by mass: 45%-70% of sulphoaluminate cement clinker, 20%-45% of an early strength exciting material, 5%-15% of a nano reinforcing material, 3%-9% of a magnesium oxide expanding agent, 1%-3% of a retarding material, 0.8%-3% of a water retention material and 0.1%-1% of a dispersing agent. The coagulant early strength agent for sprayed concrete provided by the invention takes powder as a main material, can significantly improve the compressive strength of the sprayed concrete at an extremely early age, enables the compressive strength of the sprayed concrete at 3h to be greater than or equal to 1.2 MPa, the compressive strength of the sprayed concrete at 8h to be greater than or equal to 10MPa, the compressive strength of the sprayed concrete at 1d to be greater than or equal to 15MPa and the compressive strength of the sprayed concrete at 28d to be free from shrinkage, and is relatively convenient to transport and store, relatively good in stability and free from layering and caking problems; and the manufacturing process is relatively simple.