75 results about "Calcium aluminates" patented technology

The present application relates to the technical field of building materials, in particular to a thermodynamic modified material for grotto rock mass fissure grouting and a preparation method thereof, which comprises the following components in a mass ratio: lime-based material 100-200 parts; quartz sand 30-50 parts; metakaolin 30-70 parts; calcium aluminate expansive agent 10-20 parts.The present application has the advantages of optimized thermal conductivity, controlled thermal expansion coefficient, improved microstructure and comprehensive performance.The thermal conductivity of the lime-based grouting material is higher than that of traditional tung oil materials, reducing thermal stress concentration caused by temperature gradient;the thermal expansion coefficient can be changed from negative to positive by adjusting the water-cement ratio and the amount of expansive agent, and tends to be close to the limestone rock mass, reducing the risk of interface peeling;the optimized material has higher crystallinity and denser structure, reducing microfissures and improving heat conduction efficiency;while maintaining high mechanical strength and durability, the material realizes directional modification of thermodynamic properties, providing technical support for long-term preservation of grottoes.

This invention discloses a treatment process for high-concentration sulfate wastewater, belonging to the field of wastewater purification technology. The invention first provides a multifunctional composite ion sieve, the raw materials of which include magnetic core microspheres, calcium aluminate precursor components, heavy metal chelating agents, scale inhibitors, antioxidants, antibacterial agents, host-guest recognition agents, polysaccharide compounds, polyacrylic acid compounds, crosslinking agents, and initiators. The ion sieve is prepared through steps including magnetic core preparation, calcium aluminate precursor functional layer deposition, small molecule modification layer loading, and pH-responsive outer shell coating. In use, the ion sieve is added to wastewater and stirred for adsorption. After adsorption saturation, solid-liquid separation is achieved through magnetic separation, and the material is regenerated and recycled sequentially using desorption and reconstruction solutions.

This invention provides a quadruple ion-coupled erosion-protected concrete and its preparation method, relating to the field of special concrete materials technology. The concrete comprises basic components and functional admixtures. The basic components include cementitious materials, aggregates, and water. The functional admixtures include a coupling ion locking agent, a dual-interface film-forming aid, and a salt-expansion-resistant crack-resistant agent. The coupling ion locking agent includes calcined calcium aluminum hydrotalcite and diethylenetriamine pentacarboxylate; the dual-interface film-forming aid includes isobutyltriethoxysilane and lithium silicate; and the salt-expansion-resistant crack-resistant agent includes calcium sulfoaluminate expansion agent and lightly calcined magnesium oxide. The three admixtures work synergistically from three dimensions: active ion solidification, in-situ interface shielding, and full-cycle volume compensation, achieving simultaneous solidification of the four erosion ions, continuous blocking of penetration channels, and effective offsetting of salt crystallization expansion stress. This ensures the long-term safe service of the concrete under extreme conditions of high water pressure, high humidity, alternating wet and dry conditions, and multi-ion coupling erosion.

This invention discloses a method for preparing a composite-layer reinforced long-life zirconia sizing nozzle. The method involves uniformly mixing yttrium-stabilized zirconia fine powder, high-purity calcium hexaaluminate fine powder, activated alumina fine powder, and calcium aluminate cement, adding deionized water and stirring until homogeneous, casting into a mold, demolding, and drying to obtain a composite layer preform. The composite layer preform is then isostatically pressed, sintered, cooled, crushed, ball-milled, and sieved to obtain composite layer powder. Activated alumina fine powder, yttrium oxide fine powder, calcium aluminate cement, and the composite layer powder are then uniformly mixed, water is added, and the mixture is rolled to obtain a mud. This mud is then bonded to the inner wall of the nozzle body's inner bore, dried, isostatically pressed, and sintered to obtain the finished product. The composite layer in this invention has the characteristics of being non-wetting and non-reactive with molten steel. The prepared nozzle exhibits excellent thermal shock resistance, erosion resistance, scour resistance, and high strength, improving the cleanliness of molten steel during continuous casting and contributing to the improvement of billet quality.

The present invention relates to: a repair composition for a self-heating cement composite material; and a repair method using same The present invention provides a repair composition for a self-heating composite material, comprising: calcium sulfoaluminate cement, calcium aluminate cement, a conductive filler, and a fluidizing agent

The utility model discloses a kind of automatic feeding devices for producing calcium aluminate powder of liquid polyaluminum chloride, comprising: support frame, support frame bottom is fixedly connected with automatic guided vehicle, support frame middle part is fixedly connected with feeding shell, support frame top is fixedly connected with material tank, material tank bottom is equipped with discharging mechanism, feeding shell tail portion one end is equipped with discharging butt joint mechanism, feeding shell inner side is rotatably connected with auger, feeding shell head one end is fixedly connected with motor, feeding shell top is fixedly connected with sealing shell cover;The utility model moves to specified station by automatic guided vehicle drive device, after feeding to material tank by feeding pipe, then, it is moved to the vicinity of reaction kettle, electric push rod drives butt joint pipe to be accurately butt-jointed with reaction kettle feed inlet through telescopic folding pipe and connecting pipe and supplies material, realizes whole-process automation movement, without manual handling, adapt to multi-station switching, can be flexibly fed to multiple reaction kettle, solve fixed pipeline one-to-one limitation.

This invention provides a method for quantitatively assessing the degree of sulfate attack on concrete, relating to concrete attack assessment technology, including: plotting SO4... 2‑ Concentration standard curve; determination of free SO4 in the sample. 2‑ Content, denoted as C （游离） Determine the total SO4 content of the same mass of test samples from the same source. 2‑ Content, denoted as C （总） C （总） With C （游离） The difference is the content of bound sulfate ions in the sample to be tested, denoted as C. （AFt，AFm） ; Calculate the bound sulfate content C per gram of the sample to be tested. 1 （AFt，AFm） :;C 1 （AFt，AFm） The value represents the amount of ettringite and monosulfide-type hydrated calcium sulfoaluminate formed. Using the formation of ettringite and monosulfide-type hydrated calcium sulfoaluminate as an evaluation index, the degree of sulfate attack on concrete is assessed. This method achieves a quantitative assessment of the degree of sulfate attack on concrete from the perspective of the chemical nature of the attack, and features accurate quantification, simple operation, and the ability to distinguish SO4. 2‑ Advantages such as shape.

The present invention describes a multi-component inorganic anchoring system for chemically fastening anchors and post-installed reinforcements in a mineral matrix, comprising a curable powdered aluminum cement component A and an initiator component B for initiating a curing process in an aqueous phase, wherein the powdered aluminum cement component A is an aluminum cement component based on powdered calcium aluminate cement, and wherein component B comprises an accelerator component and water, characterized in that at least a portion of the calcium aluminate cement contained in component A has an average particle size in the range of 0.5 to 15 [mu] m. Furthermore, the present invention relates to the use of a calcium aluminate cement having an average particle size in the range of 0.5 to 15 [mu] m in a multi-component inorganic anchoring system for increasing the load value, and to a method for chemically fastening anchoring members, preferably metal anchors and post-installed reinforcements, in a mineral matrix, the mineral matrix is such as a structure made of bricks, concrete, pervious concrete or natural stone.

The application discloses a kind of porous fluidized bed plate of boiling calcination kiln and preparation method, wherein, after mixing and stirring of mullite aggregate, calcium aluminate cement, water reducing agent, join proper amount of water and mix evenly, join high-temperature-resistant fiber to form castable, wherein, the high-temperature-resistant fiber includes any one of silicon carbide whisker, alumina fiber, mullite fiber, aluminum-chromium fiber;The castable is poured into the mold of porous fluidized bed plate and is shaped, after being cured at room temperature naturally, demolding is carried out and is dried, to obtain porous fluidized bed plate. Therefore, the application can effectively improve the normal temperature flexural strength, normal temperature compressive strength, high temperature flexural strength, thermal shock stability and tensile strength and other properties of the porous fluidized bed plate of boiling calcination kiln, so as to be favorable to improving the safety risk resistance and service life of the porous fluidized bed plate of boiling calcination kiln.

This invention relates to the field of solid waste cementitious material preparation technology, specifically to a rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste and its preparation method, comprising the following steps: S1. Mixing and stirring modified red mud, carbide slag, mineral powder, and modified mineralizer evenly, and then pressing into shape; S2. Performing a first-stage calcination, calcining from room temperature to 950-1000℃, and then performing a second-stage calcination to 1220-1300℃ and holding at that temperature for 30-120 minutes, and cooling to room temperature to obtain modified mineral phase clinker; S3. Passing through a 200-mesh square hole sieve, mixing with modified multi-element solid waste mineral materials in a mixer, and stirring evenly to obtain the rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste. This invention significantly reduces the calcination temperature of clinker through the synergistic effect of various raw materials, thereby greatly reducing energy consumption and carbon emissions. The complex ionic reaction mechanism and the complementary physicochemical properties of multi-component solid waste enrich the diversity of hydration products and the density of the gel structure, thus ultimately achieving the excellent performance of "fast setting, fast hardening, and high strength" of the all-solid waste cementitious material.

The utility model belongs to calcium aluminate binder powder grinding technical field, concretely relates to a kind of particle size optimization type calcium aluminate binder preparation device, including left support and right support, left support and right support are respectively fixedly connected with left bearing seat, right bearing seat, left bearing seat and right bearing seat are respectively rotationally connected with discharge port, feed inlet, the right end of discharge port is connected with discharge cylinder, feed inlet is fixedly connected with flange plate, flange plate and discharge cylinder are fixedly connected with cylinder between, cylinder is built-in with several grinding balls, the inboard left end of cylinder is fixedly connected with isolation structure, the left end of cylinder, discharge cylinder and discharge port are correspondingly provided with discharge spiral in, cylinder is connected with rotary drive component, the left end of feed inlet is connected on isolation structure, feed inlet is provided with feed spiral that penetrates its both ends, feed inlet is provided with multiple feeding holes along left-right direction. The utility model sets up multiple feeding holes, can make material more evenly fall into cylinder, effectively improve the grinding efficiency of material.

This application relates to the field of building materials technology and discloses a low-cost micro-expansion ultra-high performance concrete and its preparation method. The raw materials of the concrete include water, cement, silica fume, limestone powder, fine aggregate, coarse aggregate, polycarboxylate superplasticizer, CaO-calcium sulfoaluminate-based composite expansion agent, and sodium polyacrylate-based internal curing agent. The fine aggregate is river sand, and the coarse aggregate is basalt crushed stone. During preparation, the powders are first mixed dry, then an aqueous solution of the superplasticizer is added and stirred into a uniform slurry. The aggregate is then added, stirred, and finally molded and cured. This invention utilizes the internal curing agent to desorb moisture when the internal humidity of the concrete matrix decreases, providing moisture compensation for the later hydration of the composite expansion agent, causing the dense matrix to undergo micro-expansion deformation and convert it into self-stress. This solution effectively compensates for the volume shrinkage caused by the low water-cement ratio, reducing the risk of cracking. Simultaneously, the use of conventional sand and gravel instead of pure quartz sand significantly reduces the cost of large-scale preparation.

This invention belongs to the field of refractory material preparation technology, specifically relating to a refractory brick and its preparation method. The refractory brick of this invention uses calcined bauxite and fused white corundum as the main raw materials, providing a high-strength refractory skeleton to ensure the basic compressive strength of the refractory brick. The addition of kyanite and andalusite, through a kyanite-andalusite composite, achieves gradient control of the expansion rate; kyanite rapidly responds to mid-temperature shrinkage, while andalusite sustains high-temperature expansion, synergistically achieving volume stability. Secondary alumina ash, hematite tailings, and serpentine tailings are also added to the raw materials to promote the formation of magnesium iron spinel and mullite phases; lanthanum oxide, yttrium aluminum garnet, titanium silicon carbide, and yttrium titanate are added to further improve the strength and crack resistance of the refractory brick; calcium hexaaluminate micron powder, p-Al2O3 micron powder, and deionized water are used as composite binders. Thus, the synergistic effect between the raw materials ensures that the prepared refractory brick has excellent strength and crack resistance.

A hydraulic binder including (in % by dry weight); A. at least 50 of at least one ground and granulated blast-furnace slag; B. more than 5 of at least one calcium aluminate cement and / or of at least one calcium sulfoaluminate cement; C. more than 5 of at least one source of sulfate ions; D. between 1 and 5 of Ca(OH)2 and / or Portland cement; E. between 0.01 and 1 of at least one alkali metal carbonate; F. and at least one alkalifying reagent consisting of at least one alkali metal carbonate and / or bicarbonate, different from E; under the following conditions: (i) amount of C allows sulfate ions of C to react with B and A; (ii) the amount of F sufficiently causes a reaction with D in water resulting in a wet formulation with a pH not less than 12, for a water-to-mortar mixing rate between 10 and 35% by weight.

The application discloses a kind of dicalcium silicate-calcium sulphoaluminate-calcium sulphosilicate cement clinker and its industrialized preparation method, it is related to building material technical field, method includes steps: S1, raw material preparation, calcareous, siliceous and sulphuric raw materials are proportioned according to proportion, raw material rate value is limestone saturation coefficient 0.9~1.0, aluminium sulphur ratio ≤2.2, aluminium silicon ratio ≤1.0;S2, preheating decomposition, raw meal is handled by multistage cyclone preheater and decomposition furnace, the temperature of first-stage cyclone preheater outlet ≤310 ℃, the middle part temperature of decomposition furnace 770±10 ℃;S3, calcination, material enters rotary kiln, sintering zone temperature 1200~1250 ℃, weak oxidation or neutral atmosphere in kiln;S4, quenching, kiln clinker is cooled by grate cooler, 15~25min is cooled to 100 ℃ below from 1200~1250 ℃;S5, crushing storage, after cooling clinker is crushed and is stored, finished product is obtained, solve the problem that existing dicalcium silicate-calcium sulphoaluminate-calcium sulphosilicate cement clinker is easily decomposed at high temperature, sintering temperature zone is narrow, industrialized mineral composition fluctuation is big and kiln system is easily crust blocking.

The application discloses a processing method of a phosphorus removal material and a phosphorus removal device using the material, and relates to the technical field of water body phosphorus removal. The technical scheme points of the application are as follows: S1, 2000 kg of concentrated hydrochloric acid (20%) is reacted with 200 kg of aluminum hydroxide for 1.5 hours; S2, after the reaction in the step S1 is completed, 1200 kg of calcium aluminate powder is added and the reaction is continued for 2 hours; S3, after the reaction in the step S2 is completed, 200 kg of ferrous sulfate is added and the reaction is continued for 0.5 hours; S4, after the reaction in the step S3 is completed and the liquid is cooled to normal temperature, a reaction product A is obtained; S5, sodium alginate aluminum bauxite and iron powder are added into the product A obtained in the step S4 and stirred to obtain a product B; S6, the product B obtained in the step S6 is poured into a mold and cast and pressed into a 10*10*10mm cube to obtain a water body phosphorus removal material C. The application aims to provide a processing method of a phosphorus removal material and a phosphorus removal device using the material.

The application belongs to the technical field of refractory materials, and discloses a high-purity dense calcium hexaluminate-based refractory material, a preparation method thereof and a working lining using the same. The mixed proportion of CaO-containing raw materials, Al2O3-containing raw materials and ZrO2-containing raw materials is adjusted according to the chemical composition of the final product, and the mixed proportion is such that the mass ratio of the chemical composition Al2O3:CaO:ZrO2 is 45.5-95.5%:2.0-8.4%:0-50% according to mass parts. The materials are put into a high-temperature furnace and a mold for hot-pressing sintering, and the hot-pressing is performed while the temperature is rising, with the highest temperature being 1550-1800 DEG C and the hot-pressing strength being 0.5-30 MPa. According to the hot-pressing sintering process in the proportioning mode, the high-purity dense calcium hexaluminate-based refractory material is obtained without adding a sintering agent. The refractory material has excellent resistance to molten steel erosion and thermal shock stability, and can be widely used in the metallurgy, building material and petrochemical industries. The preparation method is scientific and reasonable, the product has high purity, and the refractory material product can increase the equipment operation cycle, reduce the production cost, and achieve the energy-saving and emission-reducing effect.

This utility model discloses a molar ratio control device for highly active calcium aluminate refractory binders, belonging to the field of mixing technology. The device includes a mixing tank and a support base. The mixing tank is mounted on the support base, and a top cover is provided on the top of the mixing tank. Multiple feed inlets are evenly distributed around the circumference of the top cover. Multiple metering pumps are installed on the top cover, connected to the feed inlets. Each metering pump has a storage tank on its top. A stirring motor is installed in the center of the top of the mixing tank, and a stirring paddle is installed at the output end of the motor. The lower end of the mixing tank has a conical bottom, and a sampling module for extracting materials from the tank is provided at the bottom. The sampling module is connected to a component analyzer. This device solves the problems of automatic quantitative feeding and online component detection of highly active calcium aluminate refractory binders, achieving precise control of the binder's molar ratio.

This invention discloses a method for preparing calcium aluminate for water treatment agents using secondary aluminum ash, belonging to the field of calcium aluminate synthesis technology. The method involves soaking and drying secondary aluminum ash to obtain pretreated aluminum ash; mixing the pretreated aluminum ash with a calcium source and a binder to form pellets; subjecting the pellets to low-temperature oxidative calcination followed by high-temperature calcination; and cooling and grinding the calcined product to obtain the calcium aluminate product for water treatment agents. This method uses secondary aluminum ash from hazardous waste as the aluminum source to prepare a high-performance calcium aluminate product for water treatment agents, and is simple to operate, low in cost, and suitable for industrial production.

The application provides a composite flocculant suitable for alkali reduction wastewater treatment and a preparation method thereof, and relates to the technical field of wastewater treatment; the method comprises the following steps: mixing magnesite tailings and sintered red mud according to a mass ratio of 1:3 and grinding to 200 meshes, and performing ladder calcination under the protection of nitrogen to obtain a magnesite-red mud mixture; a sodium silicate solution is adjusted to a pH of 3.5 by sulfuric acid, and after stirring to form a sol, titanium tetrachloride is added to perform temperature curing to obtain a prepolymer; hydrochloric acid is added to the magnesite-red mud mixture to perform reaction, and then calcium aluminate powder, the prepolymer and konjac glucomannan phosphate are added in sequence to perform stirring reaction; calcium hydroxide suspension liquid is added to adjust the alkalinity of the system to 75-80%, and after static curing, the composite flocculant is obtained; through the multi-metal cooperation of aluminum, iron, magnesium, titanium and calcium, a four-dimensional flocculation mechanism of "electric neutralization-precipitation-net capture-bridging" is realized, and the problem of easy gelation instability of traditional polysilicate aluminum salt is solved.

This invention discloses a method for preparing a gradient structure electric arc furnace cover with low thermal conductivity and high corrosion resistance. Carbon fibers are ultrasonically dispersed in an aluminosilicate sol, then 0.1-0.5% (by mass) of fine powder is added. After ultrasonic dispersion and vacuum drying, the mixture is sintered in a vacuum furnace to obtain sol-coated carbon fibers. High-purity fused white corundum particles, activated alumina fine powder, calcium aluminate cement, and sol-coated carbon fibers are added, along with a water-reducing agent. The mixture is stirred evenly, cast into shape, and dried to obtain a furnace cover green. The sides and bottom of the furnace cover green are coated with clay slurry. The green cover is then placed in alumina powder, except for the top surface which is in contact with air, and kept at 1600-1750℃ for 4-8 hours. The clay layer is then scraped off to obtain the finished product. The refractory material for the electric arc furnace cover prepared in this invention has advantages such as wide applicability, high strength, excellent thermal shock resistance and corrosion resistance, long-term non-peeling, and good heat insulation, meeting the requirements of energy saving, consumption reduction, and long service life.

This invention discloses a low-carbon magnesium-carbon refractory material for smelting silicon-manganese deoxidized steel and its preparation method; the method includes the following steps: S1, preparing CMA fine powder; wherein, CMA is a limited solid solution of magnesium oxide in calcium hexaaluminate, containing Ca2Mg2Al 28 O 46 With CaMg2Al 16 O 27 Two core components: CMA fine powder is prepared from 6.93 wt% calcium oxide powder, 89.65 wt% alumina powder, and 3.42 wt% magnesium oxide powder; S2, magnesium oxide fine powder, CMA fine powder, Al powder, and B4C powder are mixed to obtain the first mixture; magnesium oxide aggregate is mixed with phenolic resin, and then natural flake graphite is added and mixed again to obtain the second mixture; S3, the first mixture and the second mixture are mixed to obtain the target mixture; S4, the target mixture is pressed into a crucible blank and cured to obtain a low-carbon magnesium-carbon refractory material for smelting silicon-manganese deoxidized steel. The low-carbon magnesium-carbon refractory material for smelting silicon-manganese deoxidized steel exhibits improved thermal shock resistance, enhanced oxidation resistance, and improved slag resistance, showing good application prospects in the smelting process of silicon-manganese deoxidized steel.

The application belongs to the technical field of building materials, and particularly relates to a time-divided shrinkage-controlling composite expansion agent and a preparation method thereof. The composite expansion agent is composed of the following components in parts by weight: 0.5-8 parts of an azo compound, 20-30 parts of magnesium oxide, 10-30 parts of calcium oxide, 30-50 parts of calcium aluminate-calcium sulfoaluminate cement clinker, 5-10 parts of spherical sodium polyacrylate after pre-water absorption, and 5-10 parts of core-shell structure polyacrylamide resin / kaolin composite ball. The time-divided shrinkage-controlling composite expansion agent improves the full-time volume stability of concrete, greatly reduces the volume shrinkage of cement stone, and fundamentally solves the problem of large shrinkage of ultra-low water-binder ratio concrete.

The application discloses a kind of high toughness low shrinkage concrete and preparation method thereof.The concrete is composed of cementitious material system, aggregate, modified fiber and auxiliary material;Cementitious material system includes cement, mixed mineral admixture and micro-expansion component, mixed mineral admixture is metakaolin and zeolite powder compound, and micro-expansion component is calcium sulphoaluminate mineral powder;Modified fiber includes basalt fiber surface modified by silane coupling agent and polyvinyl alcohol fiber compound system.The preparation method of the application includes fiber modification, mixed mineral admixture activation, stirring, pouring molding and maintenance and the like steps.The concrete of the application has low shrinkage, high toughness and excellent mechanical properties, and can be widely used in building structure, bridge engineering and prefabricated component field.

The application discloses a kind of high-speed flux for pipeline girth weld fine wire submerged arc welding and preparation method, including by mass percentage: fluorite 23-26%, calcined coke stone 20-23%, pre-melting calcium aluminate 18-21%, talc powder 12-14%, potassium fluosilicate 5-7%, zirconium-rich iron ore 5-7%, heavy rare earth silicon iron 2.5-4%, carbonized nickel-iron alloy 2-4%.The application meets the demand of multi-fine wire submerged arc welding X90Q pipeline girth weld, has good welding process and post-welding butt joint metal mechanical properties, is widely used in pipeline production industry, greatly improves the production efficiency and life quality of people.

This utility model relates to the field of liquid polyaluminum chloride technology, and discloses an automatic preparation device for liquid polyaluminum chloride, including a support frame. A support plate is fixedly connected inside the support frame. A motor is fixedly connected to the top of the support plate. A drive column is fixedly connected to the drive end of the motor. A turntable is fixedly connected to the outside of the drive column. Limiting cylinders are fixedly connected to the holes at both ends of the turntable. A feeding hopper is fixedly connected to the outside of the limiting cylinder. Two turntables are fixedly connected to the outside of the two feeding hoppers. A support plate is fixedly connected inside the support frame. A limiting ring is fixedly connected to the top of the support plate. The limiting ring is rotatably connected to the outside of the drive column. In this utility model, the arc-shaped groove and the feeding hopper structure achieve the effect of quantitatively adding calcium aluminate powder to ensure sufficient reaction between the calcium aluminate powder and hydrochloric acid.

The application discloses a kind of high-temperature-resistant super-high-flow nano-modified polymer grouting materials and its preparation method and application, belong to geotechnical engineering technical field, the application is with composite Portland cement, fly ash and silica fume as basement, synergic calcium hydroxide, sodium carbonate, cellulose nanofiber, tannic acid controls its hydration process, fluidity and mechanical strength, nano-modified cementation particle is injected into deep surrounding rock, can keep high fluidity in high-temperature environment for a long time, effectively expand grouting diffusion range, and can realize the accurate control of grouting material gelation time.Meanwhile, high mass fraction fly ash and silica fume are excited to produce calcium silicate hydrate, solve the current conventional calcium silicate grouting cementing material in high-temperature environment poor reinforcement impermeability effect, slurry body is easy to crack and other problems.

The invention concerns a high-fluidity cementitious composition comprising between 85% and 94% of a hydraulic binder (HB) and between 6% and 15% in dry weight of calcium aluminate cement (CAC),said HB having a d10 less than or equal to 1µm, a d50 comprised between 3.5µm and 4.5 µm and a d85 comprised between 12µm and 15µm, and comprising:between 1% and 40% in dry weight of at least one lime source;between 5% and 69% in dry weight of at least on supplementary cementitious material;between 30% and 90% in dry weight of at least one filler;between 0.1% and 5% in dry weight, relative to the total weight of components a, b and c, of sulfate;said filler being a particles mixture of:- between 1% and 25% in dry weight, in respect with the total weight of the filler, of particles having a d50 greater than or equal to 0,05µm and strictly less than 2µm,- between 75% and 99% in dry weight, in respect with the total weight of the filler, of particles having a d50 greater than or equal to 2µm and strictly less than 200µm.

This utility model discloses a production line for producing calcium aluminate using aluminum ash, comprising a mixer, a first ball mill, a brick press, a tunnel kiln, and a conveying mechanism. The mixer is used to mix high-alumina alumina and calcium carbonate; the first ball mill is used to grind the mixture after mixing into a mixed powder; the brick press is used to press the mixed powder ground by the first ball mill into brick blanks; the tunnel kiln is used to calcine the brick blanks and includes a drying kiln chamber, a pre-firing kiln chamber, a calcining kiln chamber, and a cooling kiln chamber arranged sequentially; the conveying mechanism includes a material carrier and a drive assembly. The material carrier is used to carry the brick blanks, and the drive assembly is used to drive the material carrier sequentially through the drying kiln chamber, the pre-firing kiln chamber, the calcining kiln chamber, and the cooling kiln chamber. This utility model's production line for producing calcium aluminate using aluminum ash can reduce the impurity content of calcium aluminate, meet the requirements for the use of calcium aluminate in the water purification agent industry, and is conducive to its widespread application in the water purification agent industry, thus expanding the application range of aluminum ash.

Disclosed are a catalyst for reforming methane-containing gas, a method for manufacturing the same, and a method for reforming methane-containing gas using the same. The catalyst for reforming methane-containing gas includes a porous carrier and an active metal supported within the porous carrier; wherein the active metal includes nickel; the porous carrier includes calcium aluminate (CaAl2O4), a modified inorganic binder, and water; the modified inorganic binder includes an aluminum compound and an alkaline earth metal compound, and a tensile strength of the porous carrier measured by a compressive strength tester is greater than or equal to 300 N