200 results about "Bulk density" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention provides a soil health evaluation method. The method comprises the following steps: acquiring community characteristics of soil arthropods of to-be-evaluated soil; the soil arthropods are selected from at least one of diptera arthropods, arthropods of arachnids, coleoptera arthropods, hymenoptera arthropods and lepidoptera arthropods; the community characteristics comprise species composition and relative abundance of species; predicting soil indexes according to the community characteristics; the soil index is selected from at least one of a soil physicochemical index, a soil degradation index and a soil health index; the soil physical and chemical indexes are soil pH, soil total carbon, soil organic carbon and soil total nitrogen; the soil degradation indexes comprise a soil pH degradation index, a soil total carbon degradation index, a soil organic carbon degradation index and a soil total nitrogen degradation index; the soil health index is determined based on soil pH, soil microbial biomass nitrogen, soil respiration rate, soil total carbon, soil organic carbon, soil total nitrogen and soil bulk density; and performing soil health evaluation based on the soil indexes.

The invention relates to the technical field of soil physical parameter in-situ measurement, and discloses a soil layer natural water content portable intelligent measuring instrument based on multi-source sensing fusion, which comprises a composite probe assembly and an intelligent measurement and control host which are physically connected, the composite probe assembly is configured to be inserted into a soil layer to be tested to construct a multi-physical field test environment, and an electrical transceiving unit and an acoustic transceiving unit are integrated in the composite probe assembly. By constructing a cross physical field excitation and multiphase parameter collaborative decoupling mechanism, a multidimensional dynamic correlation model is established by using the thermosensitive drift characteristic of the sound velocity of a mixed medium during thermal disturbance and the transient step response of a dielectric constant under an acoustic radiation force field; the problems that the coupling influence of the water content and the volume weight cannot be distinguished and the conductivity of bound water and the conductivity of free water are difficult to separate in a traditional means are effectively solved, and four independent physical quantities including the volumetric water content, the in-situ dry volume weight, the bound water content and the actual conductivity of pore water are synchronously inverted through a single probe. And the decoupling precision of the equipment on complex multi-phase soil medium parameters is improved.

The invention relates to a preparation method of quartz sand, and belongs to the technical field of quartz. The preparation method comprises the following steps: S1, adding a polyvinyl butyral solution into silica sol, and uniformly stirring to obtain silica sol dispersion liquid; the polyvinyl butyral solution comprises polyvinyl butyral (PVB) and tert-butyl alcohol; s2, performing spray drying on the silica sol dispersion liquid to obtain quartz microspheres; and S3, carrying out oxidation carbon removal treatment and vacuum dehydroxylation treatment on the quartz microspheres to obtain the quartz sand. Drying cracking and micro-hollow structure defects of the quartz sand can be effectively eliminated, it is ensured that the product is compact and free of pores, and the structural integrity and the use reliability are greatly improved; the density performance bottleneck of quartz sand is successfully broken through, and the bulk density after sintering is remarkably improved; the particle size distribution of the quartz sand can be accurately controlled, and the product particle size uniformity is ensured.

The invention provides a ceramsite proppant as well as a preparation method and application thereof. The method comprises the following steps: grinding a coal gangue raw material, pre-sintering, cooling and then grinding again; grinding the tungsten tailing sand, the low-grade bauxite, the carbide slag and the clay; grinding after mixing the raw materials; the raw materials comprise 45-60 parts of low-grade bauxite, 20-35 parts of pre-sintered coal gangue, 15-20 parts of tungsten tailing sand, 1-5 parts of carbide slag and 7-14 parts of clay; the total amount of the low-grade bauxite, the pre-sintered coal gangue and the tungsten tailing sand is 100 parts; granulating and drying; carrying out first sintering at 800-950 DEG C; second sintering is conducted at the temperature of 1050-1200 DEG C; and naturally cooling to obtain the ceramsite proppant. The technical problem to be solved is how to realize high-valued utilization of mine solid waste and low-grade bauxite, reduce dependence on high-quality bauxite and production cost, reduce sintering energy consumption and carbon emission, reduce product body density and improve key performance such as strength and sphericity of the proppant by optimizing raw material combination and a preparation process. And the requirements of oil and gas field fracturing operation are met.

The invention discloses graded metal powder for cold metal fusion additive manufacturing, which is characterized in that metal powder with different particle sizes is graded to form multimodal particle size distribution powder, and the metal powder with different particle sizes is compounded in a gap filling manner; multi-peak particle size distribution powder obtained by grading metal powder of various particle sizes balances the fluidity and the stacking density, the metal powder of different particle sizes can be subjected to gap filling, for example, coarse particle powder dominates the fluidity, the CMF powder laying uniformity is ensured, gaps of the coarse particle powder are filled with medium particle powder, and the CMF powder laying uniformity is ensured. And then superfine particle powder is adopted to fill the remaining gaps, the superfine particle powder provides a high specific surface area, and the sintering driving force is improved. Compared with single powder, the tap density obtained through powder grading is increased by more than 10%. And the CMF process can be well adapted through the graded metal powder, the thickness of a powder laying layer can be better matched, and interlayer dislocation is avoided.

A method of shaping a shaping material, the shaping material including a powder of a fluororesin, the powder of the fluororesin having a static bulk density of 0.3 g / ml or more and 1.5 g / ml or less, and the powder of the fluororesin having a particle diameter of 10 μm or more and 300 μm or less in terms of D50.

The invention discloses an undisturbed soil bulk density measuring method and measuring device based on sediment characteristics, and the undisturbed soil bulk density measuring method comprises the following steps: sampling undisturbed soil, putting the undisturbed soil into a measuring bottle, and injecting water to a standard water level to obtain a water-soil mixed solution and stirring; the measuring bottle is placed in an NFC induction area on the soil bulk density measuring table, an NFC chip sticker at the bottom of the measuring bottle is inducted, the induction time serves as the sedimentation starting time of soil particles in the measuring bottle, and the sedimentation starting time of the soil particles is transmitted to a data terminal to be recorded; moving the measuring bottle to other places for standing until the soil particles are completely deposited at the bottom of the container; the measuring bottle is placed in the NFC sensing area again to sense the NFC chip patch, the sensing time serves as the settling ending time of the soil particles, the laser distance measuring sensor is controlled to be started through the controller, and the distance between the upper surface of the wet sediment and the laser distance measuring sensor and the distance between the bottom of the measuring bottle and the laser distance measuring sensor are measured respectively; and transmitting the acquired data to a data terminal to calculate the volume weight of the undisturbed soil.

This invention discloses a process for preparing solid sodium silicate based on controllable particle size water quenching, belonging to the field of inorganic silicate chemical technology. The specific steps are as follows: S1: raw material melting and homogenization; S2: controllable particle size water quenching; S3: solid-liquid separation and online classification; S4: deep drying and packaging. This invention achieves innovation and simplification of the production process: through a one-step "atomization-cooling" forming method, the high-energy-consuming crushing and screening processes in traditional processes are completely eliminated, shortening the process flow and reducing equipment investment and maintenance costs; it significantly improves the overall quality of the product: directly generating solid particles with high sphericity and smooth surface, the product has good flowability, stable bulk density, high whiteness, and no tendency to agglomerate during subsequent dissolution, with a faster dissolution rate and superior application performance.

The invention discloses a deep surrounding rock anchor rod spacing quantitative determination method based on fracture toughness parameters. The method comprises the following steps: obtaining the fracture toughness and uniaxial compressive strength of rock through an indoor test; determining a uniaxial compression parameter and an elastic modulus of the rock mass by combining a geological strength index GSI, a damage factor D and a Hoek-Brown criterion; calculating a brittleness index B4 by using the fracture toughness of the surrounding rock, the uniaxial compressive parameter of the rock mass and the elastic modulus; and based on the brittleness index B4, the rock mass elasticity modulus, the engineering burial depth and the rock mass volume weight, a quantitative calculation formula of the anchor rod spacing is established, an empirical coefficient is solved in combination with the spacing range of the corresponding surrounding rock grade in the specification, and finally quantitative determination of the anchor rod spacing is achieved. The method overcomes the defect that quantitative basis is lacked in spacing adjustment in existing specifications, and is particularly suitable for anchor rod support design for controlling brittle failure of surrounding rocks under the deep high-stress condition.

This invention discloses a method for determining the coal-based solid waste disposal rate in underground backfilling faces. The coal-based solid waste disposal rate is the ratio of the amount of coal-based solid waste disposed of in the backfilling faces to the total amount of coal-based solid waste in the mine. The determination steps are as follows: First, the total amount of coal-based solid waste Q in the mine is calculated; then, based on the proportion of backfilling materials used in the mine, the proportion of coal-based solid waste in the backfilling materials is determined; the layout of each backfilling face in the mine is determined, and the backfilling space volume V is calculated; the weak dynamic force P and the number of actions x of the backfilling support on the backfill body are determined, and a weak dynamic compaction test of the backfilling material is conducted to determine the bulk density ρ of the backfilling material after the weak dynamic action; finally, the total amount of coal-based solid waste Q disposed of in each backfilling face in the mine is calculated. c Finally, the coal-based solid waste disposal rate η is calculated. This invention quantitatively determines the coal-based solid waste disposal effect in the backfilling face through the coal-based solid waste disposal rate, and the results can provide a basis for the design of mine backfilling systems and the evaluation of backfilling effects.

The application provides a method for constructing a soil bulk density prediction model, related devices and equipment, which comprises: obtaining soil sample information of a target area, the soil sample information comprising first information, second information and third information, the first information being used to represent the physicochemical properties of the soil sample, the second information being used to represent the environmental characteristics of the target area, and the third information being used to represent the spectral information of the soil sample; calculating a first target parameter set of the soil sample according to the first information and the second information, the data in the first target parameter set being used to construct the soil bulk density prediction model, and the data in the first target parameter set being the data in the first information and the second information; processing the third information of the soil sample to obtain a second target parameter set of the soil sample, the second target parameter set comprising L principal components of the third information of the soil sample; and constructing a target soil bulk density prediction model according to the first target parameter set and the second target parameter set.

The invention discloses a coal gangue-based saline-alkali soil improver, which is prepared from the following components in parts by weight: 100 to 500 parts of coal gangue, 1 to 10 parts of fulvic acid and 1 to 100 parts of graphene sol, the concentration of the graphene sol is 10 to 600 mg / L; the coal gangue mainly comprises CaCO2, SiO2 and Al2O3, and the particle size of the coal gangue is smaller than 5 mm; the pH value of the fulvic acid is 4.8, and the ash content is 0.20; the graphene sol is graphene oxide sol, the interlayer spacing of the graphene oxide is 1.0-1.8 nm, and the number of layers is less than 5; according to the invention, a three-dimensional network structure system constructed by taking functionally modified graphene as a nanostructure framework, fulvic acid as a bioactive medium and coal gangue as a porous mineral is constructed, and 1 + 1 + 1 gt is realized through a design concept of organic-inorganic-nanocarbon material trinity; 3, the volume weight, the pH value, soil organic matters and the like of the saline-alkali soil can be effectively improved through the synergistic effect.

The deep soil bulk density measuring device comprises a well digging device and a soil taking device, the soil taking device is installed on a drill rod of the well digging device, the soil taking device is composed of a drill bit, a cutting ring and a pressure sensor, the drill bit is in a barrel shape, an opening of the drill bit faces downwards, the upper end of the drill bit is connected with the drill rod, and the lower end of the drill bit is connected with the cutting ring. A pressure sensor is installed in the center of the bottom of the barrel, and a cutting ring is installed below the pressure sensor in a pressing mode. According to the utility model, the characteristic that a well digging machine can collect deep soil and the characteristic that a cutting ring method is simple and operable are combined, and the deep soil is collected through the cutting ring, so that the purpose of accurately measuring the bulk density of the deep soil is achieved, and the device has certain positive significance on research in related fields such as soil physicochemical property analysis, civil engineering and soil carbon sink.

The invention relates to a titanium dioxide color master batch as well as a preparation method and application thereof. The titanium dioxide color master batch comprises the following components in parts by weight: 70-97 parts of titanium dioxide, 1-29 parts of calcium carbonate and 0.5-2 parts of polyvinylpyrrolidone. The D50 particle size of the calcium carbonate is 30 to 1260 nm; the mass ratio of the titanium dioxide to the calcium carbonate is (2.5-30): 1. The titanium dioxide color master batch provided by the invention is dust-free particles, is good in environmental protection property, regular in particle shape and moderate in fineness, has excellent flowability and bulk density, is convenient for precise metering, pneumatic conveying and automatic feeding, and has excellent automatic suitability; and meanwhile, uniform and stable white slurry can be formed after being dissolved in water, agglomerated particles and flocculates are avoided, and the dispersity is excellent.

The invention discloses a mortar fluidity evaluation model and a mix proportion inverse calculation method thereof, and belongs to the technical field of building materials.The method comprises the steps that aggregate comprehensive characteristic indexes are built by quantifying the stacking density, the specific surface area and grain shape correction parameters of aggregate; based on a cement paste volume balance principle, establishing a paste film thickness quantification model containing aggregate gap filling and surface wrapping; accurate evaluation of the fluidity is realized through a correlation model of the slurry film thickness and the mortar fluidity; and finally, based on the target fluidity, reversely deducing to obtain mortar mixing ratio parameters (water-cement ratio, mortar-sand ratio and the like) meeting the requirements. The method solves the problems that the traditional method cannot quantify the multi-feature coupling influence of the aggregate, the fluidity evaluation error is large, and the mix proportion design depends on experience, realizes the accurate prediction of the mortar fluidity and the efficient back-stepping of the mix proportion, is suitable for various aggregates such as natural sand, machine-made sand, shaping sand and the like, and provides a scientific basis for the mortar engineering application.

This invention discloses a method for preparing silica checker bricks for high-density, low-porosity hot blast stoves, belonging to the field of refractory material preparation technology. The method includes the following steps: raw material selection and pretreatment, optimizing the particle size distribution of silica sand (coarse particles ≤5%, medium particles 70-80%, fine powder 15-20%), and introducing silica brick sand particles and silica fine powder to achieve close packing; batching and mixing, adding mineralizers, fluorite powder, binders, and high-efficiency water-reducing agents in proportion, and mixing until uniform through a specific feeding sequence; semi-dry pressing, using double-sided pressing technology to control the apparent porosity of the brick blank to ≤19.0% and the bulk density to ≥2.10 g / cm³; after drying, using a segmented firing regime, holding at 1420-1450℃ for 18-36 hours to promote the conversion of cristobalite to tridymite, with a residual quartz content ≤1.0%. This invention achieves high density, low porosity, high volume stability, and excellent high-temperature performance of the brick body through particle size optimization, composite additives, and precise firing control.

The invention provides a production method of lanthanum zirconate, and belongs to the technical field of inorganic non-metallic materials. According to the invention, an electric smelting method is adopted, during high-temperature smelting, a zirconia material and lanthanum oxide / lanthanum carbonate are fully subjected to a high-temperature liquid phase chemical reaction at high temperature, an all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be obtained, and the all-La2Zr2O7-phase electric smelting lanthanum zirconate product can be processed into particle size sand and fine powder with various particle sizes or can be processed into crushing and grading powder for a high-temperature thermal barrier coating material according to the requirements of users. Compared with a La2Zr2O7 material prepared by a solid-phase reaction method, a precipitation method, a sol-gel method, a self-propagating combustion method, a hydrothermal synthesis method and the like, the lanthanum zirconate prepared by the method provided by the invention is high in volume density and low in porosity, can be processed into particles and fine powder / graded powder with various particle size levels, is good in high-temperature volume stability, and can be used for preparing the lanthanum zirconate material. As an electric melting material, the material has the characteristics of small reheating shrinkage and small high-temperature creep deformation.

This utility model discloses a layered mesh integrated cultivation pot, relating to the field of cultivation pot technology. This layered mesh integrated cultivation pot includes a substrate pot, a lower trapezoidal sand storage pot, and an integrated structure. The lower trapezoidal sand storage pot is fixedly connected to the bottom of the substrate pot, with a ratio of 1:2 between the substrate pot and the lower trapezoidal sand storage pot. The integrated structure includes a mesh, a bottom plate, a feeding port, a rectangular support plate, a cultivation frame, and a spacing plate. The cultivation frame is mounted on the substrate pot, and the bottom of the cultivation frame is integrally formed with a spacing plate. Multiple sets of horizontal holes are provided on the spacing plate to facilitate the growth of seedling roots. Compared with traditional root-promoting cultivation methods, this utility model rationally separates the upper and lower layers. The substrate pot has ideal bulk density and good physicochemical properties, which is beneficial for fixing seedlings or miniature potted plants to maintain upright growth, ensuring normal root development, and achieving simultaneous root strengthening, root promotion, and root nourishment, reducing manpower, material resources, and financial resources during the root promotion period.

The invention relates to the use of SiC particles (grains) in a powder bed print method for providing a SiC ceramic preform (green body), wherein the SiC particles (grains) are characterized by - an average grain size (d50) of 2 to 70 µm, preferably 3 to 65 µm, more preferably 5 to 50 µm, such as 25 to 60 µm, preferably 40 to 55 µm, - a roundness of > 0.55, preferably > 0.58, more preferably > 0.6 (as described in experimental section), - bulk density of > 1.6 g / cm3, preferably > 1.65 g / cm3, more preferably > 1.7 g / cm3, even more preferably > 1.75 g / cm3 (according to DIN EN 725-9 ISO 23145-2).

The utility model relates to the technical field of material volume weight detection devices, and particularly discloses a flexible porous material volume weight detection device, which comprises a bearing part for placing a material to be detected; wherein in the length direction of the to-be-detected material, the plurality of bearing parts are arranged below the to-be-detected material at fixed intervals; the load detection part is used for detecting the load change of the bearing part; by using the device, the volume weight of the to-be-detected material can be quickly and simply detected, the to-be-detected material cannot be damaged, the volume weight of each product on a production line can be detected, and the quality control of the products can be effectively improved; besides, a terahertz wave detector does not need to be used, the overall cost of the detection device can be effectively reduced, the thickness of the to-be-detected material is not limited, and volume weight detection can be effectively carried out on the to-be-detected materials with different thicknesses.

A geopolymer composition can include a geopolymer matrix together with a density-reducing material and a thermally conductive material. Advantageously, the density-reducing material can have a bulk density less than the density of geopolymer matrix without the density-reducing material. The composition can include, based on a total weight of the composition, the density-reducing material in an amount of 5 wt% to 50 wt% and / or the thermally conductive material in an amount of 3 wt% to 30 wt%. Such geopolymer compositions can be applied as one or more geopolymer layer on a thermally conductive substrate. The geopolymer compositions and layers can withstand relatively high temperatures and transfer heat relatively rapidly, which can be useful for a variety of apparatuses.

Particles, powders thereof, particle dispersions throughout the stratosphere and corresponding methods for solar radiation modification and management (SRM) are provided. Disclosed particles are safe for inhalation and in the biosphere, inert towards most compounds in the atmosphere, optionally produced in large-scale production of millions of tons per year, scatter in the visible and ultraviolet (UV) ranges without significant absorption, scatter and minimize absorption in the infrared (IR) range, sized to achieve a residence duration in the stratosphere that is longer than a year, optical properties and safety criteria, tagged for monitoring dispersal and distribution, and dispersible from an airplane with a bulk density over 0.3 g / cc and with respect to the required energy and air available for dispersal from the airplane.

The utility model belongs to the technical field of geological exploration, and particularly relates to an easy-to-sample soil bulk density sampler which comprises a barrel body, an opening end and a barrel cover are arranged at one end of the hollow cylindrical barrel body, the opening end is used for being inserted into soil for sampling, and the barrel cover is used for being matched with the opening end of the barrel body in a covering and pressing mode. A mounting pipe is concentrically arranged at the other end, away from the open end, of the barrel, the two ends of the mounting pipe are open and communicate with the barrel, a handle is concentrically and rotationally mounted at the end, away from the barrel, of the mounting pipe, a threaded sleeve extending into the mounting pipe is arranged on the handle, and a threaded rod extending into the barrel is in threaded connection with the threaded sleeve; the end part of the threaded rod is provided with a push plate attached to the inner wall of the cylinder body, so that the soil bulk density measurement efficiency and accuracy are improved, the damage to a soil sample can be reduced, and the reliability of a sampling result is improved.

The invention provides a high-strength heat-insulating castable for a furnace top of an aluminum melting furnace and a preparation process of the high-strength heat-insulating castable, and belongs to the technical field of refractory materials for the aluminum melting furnace. The refractory castable product is prepared from the following raw materials: medium-low-density alumina clinker with the particle size of 8-1mm and the volume density of 1.50-2.60 g / cm < 3 >, high-alumina bauxite with the particle size of 1-0.088 mm and less than or equal to 0.074 mm, aluminum oxide micro powder with the particle size of less than or equal to 5mu m, silicon dioxide micro powder with the particle size of less than or equal to 2mu m, a sintering aid, an explosion-proof agent, a reinforcing agent, a water reducing agent and a binding agent. According to the invention, the middle-low density alumina clinker is selected as a main raw material, and the anti-explosion agent and the reinforcing agent are supplemented, so that the prepared castable has the breaking strength of 18-31 MPa at the high temperature of 1200 DEG C and the heat conductivity coefficient of 0.20-0.40 W / (m.K).

The present application relates to the field of engineering geology and geological disaster prevention technology, in particular to a system and method for evaluating the stability of dangerous rock with steeply inclined fissures in the rear edge, comprising: S1, obtaining high-precision point cloud data of the dangerous rock surface by using unmanned aerial vehicle oblique photography, aerial remote sensing or airborne LiDAR, and constructing a triangular mesh model of the dangerous rock surface; S2, constructing a three-dimensional entity model according to the boundary conditions and sliding surface of the dangerous rock; S3, extracting the volume, barycenter position, sliding surface area and spatial occurrence information of the sliding surface from the three-dimensional entity model, and calculating the self-weight of the dangerous rock by combining the rock mass bulk density and the additional weight of the water in the fissure; the present application constructs a fine three-dimensional scene model of the dangerous rock based on unmanned aerial vehicle oblique photography or LiDAR point cloud, which can accurately extract key geometric parameters such as the volume, barycenter, sliding surface area and inclination of the dangerous rock, avoids the morphological distortion problem caused by two-dimensional simplification, and makes the stability analysis more close to the actual engineering scene.

The invention discloses a solid sodium silicate preparation process based on particle size controllable water quenching, and relates to the technical field of inorganic silicate chemical industry, and the preparation process comprises the following specific steps: S1, melting and homogenizing raw materials; s2, particle size controllable water quenching; s3, carrying out solid-liquid separation and online grading; and S4, deep drying and packaging. According to the invention, the innovation and simplification of the production process are realized: through an atomization-cooling one-step forming method, high-energy-consumption crushing and screening procedures in the traditional process are thoroughly eliminated, the process flow is shortened, and the equipment investment and maintenance cost are reduced; solid particles with high sphericity and smooth surfaces are directly generated, the product fluidity is good, the bulk density is stable, the whiteness is high, the caking tendency is avoided in the subsequent dissolution process, the dissolution rate is higher, and the application performance is excellent.

The invention provides a high-strength microporous mullite aggregate and a preparation method thereof. The mullite aggregate comprises the following raw materials in parts by mass: 20-35 parts of coarse carbon particles with the particle size of 4-3mm; 10-20 parts of fine carbon particles with a particle size of less than 3-1 mm; 5-15 parts of sawdust powder with a particle size of less than 0.2 mm; 1-10 parts of fly ash with a particle size of less than 0.074 mm; 20-30 parts of white mud with a particle size of less than 0.088 mm; 10-20 parts of dust collection powder with the particle size lower than 0.088 mm; 10-25 parts of sinking beads with a particle size of less than 0.15 mm; 1-2 parts of yellow dextrin; 20 to 40 parts of water glass; and 3-5 parts of a foaming agent. The high-strength microporous mullite aggregate has the characteristics of low volume density, high compressive strength, good thermal stability, stable chemical performance and the like.

The invention belongs to the technical field of refractory material preparation, and particularly relates to a high-density CMA refractory material and a preparation method thereof.The high-density CMA refractory material comprises the main components of Ca2Mg2Al28O46 and CaMg2Al16O27, the mass percent of the Ca2Mg2Al28O46 and the CaMg2Al16O27 is larger than or equal to 90%, the volume density of the CMA refractory material is 3.5-3.62 g / cm < 3 >, the water absorption rate is smaller than 1.2%, and the refractoriness under load is 1680-1700 DEG C. According to the preparation method, modified raw materials containing low-melting-point C12A7 and C3A phases and an active magnesium aluminate spinel phase are firstly prepared, the modified raw materials are melted in subsequent high-temperature reaction sintering, rearrangement of raw material particles and diffusion reaction among the raw materials are accelerated, the reaction sintering process of the CMA material and formation of equiaxial CMA crystal grains are promoted, and the preparation process of the CMA material is accelerated. The volume density and the refractoriness under load of the CMA refractory material are effectively improved.