37 results about "Cenosphere" patented technology

The invention relates to the field of building heat storage materials, in particular to fly ash-based inorganic phase-change heat storage aggregate based on solid waste utilization and a preparation method of the fly ash-based inorganic phase-change heat storage aggregate. According to the inorganic phase change aggregate, fly ash is selected as a raw material, gel balls are used as a template, fly ash hollow balls are obtained through granulation, drying and sintering, and the hollow balls have good compressive strength; and enabling the fly ash hollow spheres to bear inorganic hydrated salt through a vacuum adsorption method, and packaging for three times to obtain the fly ash-based phase change aggregate. According to the inorganic phase-change aggregate prepared by the method, the fly ash is selected as an aggregate matrix, the gel beads are used as a core material for granulation, water spraying is not needed in the granulation process, and the process flow is simple, low in cost and easy to implement. The inorganic phase change aggregate prepared by the invention has the mechanical strength of the aggregate and also has a phase change heat storage function; and the inorganic hydrated salt phase change material is used, so that the phase change material also has nonflammable performance.

This invention relates to the field of non-fired brick preparation technology, specifically disclosing a method for preparing non-fired bricks with recycled concrete aggregate for thermal insulation. The method includes the following steps: (1) Immersing the recycled concrete coarse aggregate in a saturated calcium bicarbonate solution, then removing and drying the coarse aggregate to obtain pretreated coarse aggregate. (2) Taking the following raw materials: 45-62 parts by weight of slag powder, 18-25 parts by weight of silicate cement, 6-10 parts by weight of fly ash cenospheres, 30-40 parts by weight of the pretreated coarse aggregate, 55-70 parts by weight of sand, and 1-2 parts by weight of water-reducing agent. The above raw materials are mixed evenly, and then mixing water is added according to a water-cement ratio of 0.18-0.22. After mixing, the resulting brick is pressed into a blank and naturally cured to obtain non-fired bricks. The method of this invention can effectively reduce the adverse effects of recycled concrete aggregate on the mechanical properties of non-fired bricks, and the non-fired bricks prepared by this invention also have good thermal insulation properties.

The application discloses a method for enhancing the compressive strength of hollow microspheres and relates to the technical field of hollow microsphere processing. Traditional hollow microspheres have internal unevenness during the manufacturing process, especially the voids gather due to thermal diffusion, form a gap, and then form a crack nucleus under the action of stress. The crack nucleus diffuses to the glass surface and develops into a microcrack. In addition, the structure of the glass surface also affects the generation of the microcrack. Under the condition of ultrahigh pressure, these small microcracks directly limit the upper limit of the strength of the hollow microspheres. The application utilizes a water-isostatic pressure resistant equipment to remove the hollow microspheres with small microcracks and other hollow microspheres with low compressive strength, such as eccentricity and multiple cavities, generated in the production process, so as to improve the strength of the remaining whole hollow microsphere products.

The invention belongs to the technical field of coatings, and discloses a Pb-Mg-Si-C composite hollow sphere with high corrosion resistance and a preparation method thereof.The preparation method comprises the steps that light magnesium oxide powder, monatomic silicon powder, lead-series low-melting-point glass powder and an additive are subjected to ball milling and premixing and then added into a polyamide resin solution, floating beads are used as spherical supporting bodies, and the Pb-Mg-Si-C composite hollow sphere with high corrosion resistance is obtained; controlling the wrapping degree of a shell layer on the surface of the floating bead according to the dosage of the polyamide resin solution and the stirring speed; the high-corrosion-resistance Pb-Mg-Si-C composite hollow spheres are prepared by the steps of mixing the raw materials, performing molding in a granulator, performing sieving, performing drying, performing heat treatment and the like. The raw materials which are low in cost and easy to obtain are adopted, the characteristics of low cost and simple preparation process are achieved, and the prepared Pb-Mg-Si-C composite hollow sphere has excellent corrosion resistance and toughness.

Disclosed in the present invention are a wear-resistant high-strength lightening admixture for a drilling fluid, and a preparation method therefor. The lightening admixture comprises the following components in percentages by mass (on the basis of all the components totaling 100%): 65-75% of silicon dioxide, 5-10% of aluminum oxide, 5-10% of diboron trioxide, 5-10% of an alkaline earth metal oxide, 5-10% of an alkali metal oxide, 0.2-3% of a rare-earth element, 0-2% of ferric oxide, 0-2% of manganese dioxide, 0-2% of zirconium oxide, 0-2% of zinc oxide, and 0.2-5% of other trace element materials. The preparation method comprises: crushing, grinding and granulating all the components to prepare precursor particles; and pre-treating the precursor particles, then subjecting same to high-temperature hollow-sphere formation, and then performing a surface treatment to prepare a wear-resistant high-strength lightening admixture for a drilling fluid. The product has the advantages of being environmentally friendly an obvious density reducing effect, lubricating and resistance-reducing functions, no loss of MWD signals, etc.; moreover, the problems of low compressive strength, proneness to breakage, poor wear resistance, etc., of existing low-density hollow glass bead lightening admixtures are solved.

The application belongs to the technical field of building materials, and particularly discloses a semi-flexible pavement grouting material, a preparation method and a use method thereof. The semi-flexible pavement grouting material comprises the following raw material components: high-free calcium belite sulphoaluminate clinker, gypsum, granulated blast furnace slag powder and fly ash cenospheres; wherein the high-free calcium belite sulphoaluminate clinker comprises the following mineral components: anhydrous calcium sulphoaluminate, free calcium sulphate, free calcium oxide, belite and iron phase. The application uses a large amount of industrial waste such as gypsum, granulated blast furnace slag powder, fly ash cenospheres and steel slag powder as main raw materials, and adds high-free calcium belite sulphoaluminate clinker, amorphous calcium aluminate and silica fume and the like, so as to utilize the synergistic effect of the components and prepare a high-strength semi-flexible pavement grouting material. The application effectively solves the problems of low strength, poor water resistance and poor durability of the grouting material under a large amount of gypsum.

The application discloses a wear-resistant high-strength lightening agent for preparing low-density drilling fluid, and the mass content of each component of raw material components is calculated according to 100%: 64-75% of silicon dioxide, 4.5-8% of aluminum oxide, 4.5-9% of boron oxide, 4.5-9% of calcium oxide and magnesium oxide, 5-9% of sodium oxide and potassium oxide, 0.2-2.2% of cerium oxide and lanthanum oxide, 0.3-1.5% of iron oxide and manganese dioxide, and 0.5-5% of other trace element materials. All components are crushed, ground and granulated to prepare precursor particles; the precursor particles are pretreated, high-temperature hollow spheroidized, and then surface treated to prepare the wear-resistant high-strength lightening agent for preparing low-density drilling fluid. The product has the advantages of environmental friendliness, obvious density reduction effect, lubrication and drag reduction, no loss of MWD signal, and the like, and solves the problems of low pressure strength, easy breakage and poor wear resistance of the existing low-density hollow glass microsphere lightening agent.

The invention discloses a photo-thermal micro-electrolysis floating material as well as a preparation method and application thereof, and relates to the technical field of photo-thermal interface water evaporation. The floating material is prepared from iron-carbon composite powder, fly ash floating beads, a binder, a pore forming agent and deionized water according to a specific ratio. The preparation method comprises the following steps: preparing iron-carbon composite powder, preparing forming slurry, forming a mold, spraying carbon dots, drying and sintering. Meanwhile, the invention also provides application of the photo-thermal type micro-electrolysis floating material or the photo-thermal type micro-electrolysis floating material prepared by the preparation method in wastewater purification. The floating material has excellent photo-thermal conversion performance and micro-electrolysis performance and good floatability and mechanical strength, VOCs / water separation in the wastewater distillation and purification process can be efficiently promoted through solar energy, the wastewater treatment efficiency is improved, and the wastewater treatment energy consumption is reduced. The preparation method is simple and easy to operate, the raw materials are obtained from the coal-series solid waste, the cost is low, and recycling of the coal-series solid waste can be promoted.

This invention discloses a tetrachloroaluminate-modified type A molecular sieve, its preparation method, and its application. The invention uses fly ash cenospheres as the main raw material to prepare a type A molecular sieve. Through modification with a mixture of fly ash and tetrachloroaluminate, it exhibits excellent adsorption performance for cobalt, cesium, and strontium ions. The type A molecular sieve prepared in this application has a good synergistic effect with tetrachloroaluminate, effectively solving the problems of complex processes, high costs, and poor adhesion of existing molecular sieve adsorbent preparation methods in the market. 137 Cs, 60 Co, 90 This method addresses the problem of low adsorption rates of major hazardous nuclides in radioactive wastewater such as Sr, and can be used to adsorb radionuclides in nuclear wastewater.

A method is presented for producing hollow microspheres of metal oxides (HMOMS) and / or hollow metal silicates microspheres (HMSMS) in a transforming solution. The transforming solution contains an atom M, or an M-ion, or a radical containing M. M in the transforming solution has the thermodynamic ability to replace silicon atoms in hollow silica microspheres (HSMS) and / or hollow glass microspheres (HGMS). The maximum temperature for transformation is set by the chemical physical properties of the transforming solution, and the viscosity of the silica in the walls of the HSMS and / or the glass in the walls of the HGMS. Viscosity, of enough magnitude, helps retain the desired shape of the hollow sphere as it is transformed to HMOMS and / or HMSMS. Non-spherical shapes can be produced by increasing the transformation temperature whereby the viscosity of the walls of the HSMS and / or the HGMS is reduced. Transformation can take place at a single temperature or at several temperatures, each temperature for a separate hold time.Methods are presented for:1. production of micro composite castings and continuous production of sheets of micro composites, both consisting of hollow spheres in a matrix,2. harvesting of HMOMS and HMSMS, and3. specialty castings for anisotropic properties using 3-dimensional printing

This invention relates to the field of antibacterial and antifouling materials, specifically to a MOF-coated hollow spherical core-shell structure material, its preparation method, and its applications. The core-shell material uses hollow Cu2O spheres as a substrate, with a continuous MOF shell layer coated on the outer surface of the substrate. The diameter of the hollow Cu2O spheres is 200-300 nm, and the shell layer thickness is 40-60 nm. The MOF shell layer covering the outer surface of the hollow Cu2O spheres has a thickness of 80-130 nm. This invention also provides a method for preparing the above-mentioned core-shell structure material, combining hollow structure design with a heterogeneous nucleation epitaxial growth strategy. Using hollow Cu2O spheres as a substrate, a MOF shell layer is grown in situ on its surface, forming a core-shell structure composite material with a tight heterogeneous interface, significantly improving the antioxidant capacity of cuprous oxide. The core-shell material can be directly used as a photocatalytic antifouling agent, suitable for catalytic antifouling and microwave absorption applications.

The invention relates to the technical field of composite heat-insulating bricks for rotary kiln liners, and discloses a composite heat-insulating brick for a rotary kiln liner and a preparation method thereof.The composite heat-insulating brick for the rotary kiln liner comprises a connecting column 1, a light refractory layer 2 and a heat-insulating base layer 3; the heat insulation base layer 3 comprises the following raw materials in parts by weight: 10-15 parts of silica fine powder, 4-7 parts of aluminum silicate, 3-5 parts of aluminum silicate fibers, 1-3 parts of polyacrylamide, 0.5-1 part of silicon carbide whiskers, 2-3 parts of corundum powder and 1.5-3 parts of an auxiliary agent, and the light refractory layer 2 comprises the following raw materials in parts by weight: 4-7 parts of floating beads, 5-8 parts of aluminum oxide hollow spheres and 2-5 parts of zirconium oxide hollow spheres. According to the invention, the polyacrylamide and the silicon carbide whiskers are added into the heat-insulating base layer, so that the problem that the performance and the service life of the heat-insulating brick are reduced due to the fact that the heat-insulating brick for the traditional rotary kiln lining possibly cracks under the action of thermal shock in the operation process of the rotary kiln is solved.

This invention discloses a preparation process for a composite conductive concrete material made of coal gangue and carbon black, comprising the following steps: (1) Tetraethyl orthosilicate and anhydrous ethanol are mixed to form a pretreatment solution. Carbon black powder is mixed with the pretreatment solution and then ultrasonically treated, and then allowed to stand. After completion, the solid product is separated to obtain the pretreated carbon black. (2) The pretreated carbon black is dispersed in water to form a dispersion, and an alkaline solution is added to adjust the dispersion to alkalinity, and then a heating reaction is carried out. After completion, the solid product is separated, dried, and ground to obtain modified carbon black powder. (3) The following raw materials are taken: silicate cement, coarse aggregate, conductive fine aggregate made of coal gangue, modified carbon black powder, fly ash cenospheres, water-reducing agent, and defoamer. The raw materials are mixed evenly and then water is added and stirred evenly to obtain the conductive concrete material. The process of this invention not only improves the conductivity of concrete, but also overcomes the problem of reduced concrete strength caused by the addition of carbon black.

Process for the preparation of hollow spherical glass particles comprising at least SiO2, Al2O3, and an alkali metal oxide, wherein the process comprises the preparation of precursor particles comprising at least SiO2, Al2O3, and an alkali metal oxide by mixing the starting materials, slurrying the starting materials with water followed by spry-drying and heat-treating the obtained precursor-particles at a temperature from 1000° C. to 1800° C., preferably from 1300° C. to 1600° C. by contacting the precursor particles with at least one naked flame.

The invention discloses a method for preparing gradient foam metal based on fly ash floating bead occupation and product application, and belongs to the field of porous metal materials. The method comprises the steps that fly ash floating beads serve as removable placeholders, the fly ash floating beads and a binder are prepared into a prefabricated body with the porosity gradient, then pores of the prefabricated body are filled with metal melt through seepage casting, after cooling, the floating beads confined in a metal framework are crushed and separated through a mechanical crushing method, and finally the gradient foam metal of the three-dimensional communicating hole structure is obtained. The traditional cognition that fly ash floating beads can only serve as permanent reinforcements is subverted, and low-cost and green preparation of the high-performance gradient foam metal is achieved through the double properties of low cost and easy removal of the fly ash floating beads. The obtained product has the advantages of light weight, high strength and function designability, and has wide application prospects in the fields of aerospace energy absorption structures, efficient heat exchangers, electromagnetic shielding spaces and the like.

This invention belongs to the field of solid waste treatment technology, specifically disclosing a method for preparing artificial cenospheres using solid waste fly ash. The method involves weighing solid waste fly ash, a high-temperature foaming agent, a modifier, and an adhesive, mixing them evenly, and drying the mixture. The resulting mixture is then granulated to form artificial cenosphere blanks. The dried artificial cenosphere blanks are placed in a vortex expansion vitrification furnace for heat treatment. During this process, the modifier transforms into a liquid phase at high temperature and fills the pores of the microspheres. Simultaneously, the gas generated by the high-temperature foaming agent increases the internal pressure of the blank and promotes the formation of a porous structure within the microspheres. Finally, the blanks are cooled in the furnace, resulting in artificial cenospheres with a porous internal structure and a dense, hard glaze layer on the surface. This method is simple, low-cost, and suitable for industrial production. The implementation of this method requires the consumption of a large amount of solid waste fly ash, thus reusing the waste and effectively solving the environmental pollution problem caused by the large accumulation of solid waste fly ash.

The invention discloses an asphalt concrete anti-stripping agent which comprises the following components in parts by weight: 5-15 parts of fly ash sinking beads and 10-20 parts of carbide slag. The fly ash sinking beads comprise the following components in percentage by weight: 50-60% of silicon oxide, 30-40% of aluminum oxide and 1-10% of calcium oxide; the carbide slag comprises the following components in percentage by weight: 3-8% of silicon oxide, 1-3% of aluminum oxide and 50-70% of calcium oxide. According to the asphalt concrete anti-stripping agent provided by the invention, the fly ash sinking beads containing silicon oxide, aluminum oxide and calcium oxide and the carbide slag with high calcium oxide content are selected, the fly ash sinking beads have relatively high reaction activity, calcium aluminosilicate is generated under an alkaline condition, and the calcium aluminosilicate can be chemically bonded with asphalt; the stability of the asphalt concrete at high temperature and low temperature is enhanced, and the anti-stripping performance is remarkably improved.

The invention discloses a YSZ thermal barrier coating with a controllable non-through pore structure and a preparation method of the YSZ thermal barrier coating, the YSZ thermal barrier coating is formed by YSZ ceramic composite powder through plasma spraying, and the YSZ ceramic composite powder is formed by mixing the following components in percentage by mass: 20-30% of nanocrystalline agglomerated YSZ powder, 20-30% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal agglomerated YSZ powder, 5-10% of nanocrystal Micron YSZ (Yttria Stabilized Zirconia) powder accounting for 20 to 30 percent; hollow spherical YSZ (Yttria Stabilized Zirconia) powder accounting for 40%-60%; the porosity of the coating ranges from 6% to 12%, the pore structure is non-through, and pores are distributed in an isolated mode and are not communicated. According to the preparation method, the nanocrystalline agglomerated YSZ powder, the micron YSZ powder and the hollow spherical YSZ powder are mixed, a porous coating microstructure with non-communicated pores is realized through a plasma spraying technology, and the prepared coating has excellent heat resistance, comprehensive mechanical properties and good economical efficiency.

The present invention provides a method for preparing high-quality hollow spheres by using copper smelting waste slag, which relates to the technical field of secondary resource recycling in the non-ferrous metallurgy industry. The preparation method of the high-quality hollow spheres is as follows: taking copper smelting waste slag as the basic raw material, adding an appropriate amount of S, mixing to form a mixture, and using a ball mill to grind the mixture to obtain powder; making the powder into hollow spheres through a plasma spray gun; using an air sieve to screen the hollow spheres; under the protection of an inert gas, performing high-temperature roasting on the screened hollow spheres to reduce the content of toxic elements in the hollow spheres, that is, obtaining high-quality hollow spheres that meet national standards and can be industrially applied. The overall preparation process of the present invention is simple, can greatly reduce the content of the toxic element As in the hollow spheres, and enables the prepared hollow spheres to become products that can be directly industrially applied.

The present invention relates to the field of recycling of waste batteries containing lithium iron phosphate, in particular to a soft soil solidifying agent based on waste lithium iron phosphate cathode powder, a preparation method and an application thereof. The soft soil solidifying agent comprises, by mass parts: 10-30 parts of waste lithium iron phosphate cathode powder, 10-75 parts of silica fume, 50-80 parts of slag, 10-20 parts of fly ash cenospheres, and 1-3 parts of water glass. Under the synergistic action of each component, the soft soil solidifying agent has a relatively high unconfined compressive strength. The 7-day unconfined compressive strength of the solidified soil is 0.75-4.96 MPa, and the 28-day unconfined compressive strength of the solidified soil is 2.07-7.63 MPa. The soft soil solidifying agent of the present invention realizes the high-value utilization of waste lithium iron phosphate, reduces the cost of the soft soil solidifying agent, and reduces the environmental pollution caused by waste batteries.

The invention discloses a preparation method of a WO3 hollow sphere, an egg-shaped WO3-TiO2 heterojunction and a sea urchin-shaped WO3-ZnO heterojunction, and an application of the WO3 hollow sphere, the egg-shaped WO3-TiO2 heterojunction and the sea urchin-shaped WO3-ZnO heterojunction in an ultraviolet detector. The WO3 hollow sphere disclosed by the invention is composed of a large number of nano-particles and shows rough surface characteristics and a hollow spherical nano-structure with a hollow interior; the'egg '-shaped WO3-TiO2 heterojunction shows that a layer of thin TiO2 shell layer wraps the outer part of the WO3 hollow sphere, and the whole body is in an'egg'-shaped form; the'sea urchin '-shaped WO3-ZnO heterojunction takes a WO3 hollow sphere as a core, ZnO nanorods are densely and approximately vertically grown on the surface of the sphere, and the whole'sea urchin'-shaped microstructure is presented. The preparation method comprises the following steps: synthesizing a WO3 hollow sphere by adopting a hydrothermal method, further respectively preparing an egg-shaped WO3-TiO2 heterojunction composite material and a sea urchin-shaped WO3-ZnO heterojunction composite material through solution synthesis, and constructing an ultraviolet detector by taking the obtained material as a detection material, and the detector can detect ultraviolet light without additionally applying bias voltage. The WO3 hollow sphere, the egg-shaped WO3-TiO2 heterojunction with a unique microstructure and the sea urchin-shaped WO3-ZnO heterojunction with a unique microstructure are synthesized by utilizing a simple solution method, the ultraviolet detector with a self-energy-supply characteristic is further prepared, and the ultraviolet detector is suitable for the field of photoelectric detection. The preparation process is easy to operate, low in cost, free of environmental pollution and suitable for large-scale production, and has wide application prospects and remarkable practical value.

Methods for producing a hollow spheres, optionally with a vacuum inside, are disclosed. An example method includes providing a seed with a core and a coating. The seed is heated to a temperature sufficient to transform the coating into a continuous shell having an interior and an exterior. The shell isolates the core from the exterior of the shell. The temperature is also sufficient to cause a reaction with the materials of the core, and the reaction converts the core to a gas within said shell. Controlling the rate of heating and the pressure surrounding the shell allows the shell to expand responsive to gas pressure within the shell. Cooling the shell causes the gases within the shell to revert to a solid form, thereby creating a vacuum within the shell. Products incorporating the hollow spheres are also disclosed.

A method for preparing alumina hollow sphere heat-insulating material from chromium production waste residue, relates to a smelting waste residue comprehensive utilization method.The method uses the way of replacing the furnace shell, and lets the liquid of the reduced chromium oxide into the lower part of the furnace shell, and the upper layer covers the alumina melt, which avoids the possibility of the metallic chromium contacting air and being oxidized, and improves the efficiency of the aluminum-chromium residue refining metallic chromium.The invention converts the residue produced in the production of metallic chromium by aluminum thermal method into two products, one is alumina hollow sphere, one is high-grade heat-insulating material; the other is metallic chromium. The two products are both high-priced products, and realize the high-value utilization in the resource comprehensive utilization of aluminum-chromium residue waste residue.

The invention belongs to the technical field of tunnel engineering materials, and discloses a cement-based composite repair material for high ground stress tunnel void damage and a preparation method thereof, the cement-based composite repair material comprises the following components by mass: 250-300 parts of water; the building material is prepared from the following components in parts by mass: 750-950 parts of a cementing material, 300-420 parts of superfine fly ash floating beads, 4-6 parts of a water reducing agent, 4-6 parts of epoxy propoxy trimethoxy silane, 5-8 parts of PE / PVA fibers, 8-20 parts of basalt / micro-steel fibers, 4-8 parts of a CSA expanding agent, 2-5 parts of light calcined MgO, 2-6 parts of an SBR or PU emulsion, 2-4 parts of nano SiO2 and a defoaming agent, wherein the mass percent of the defoaming agent in the epoxy propoxy trimethoxy silane is 3-8%. The repair material has the characteristics of low shrinkage, controlled micro-expansion and high-toughness energy consumption, forms a modulus gradient and an energy consumption transition area on a structure and an interface layer, and realizes smooth transmission of stress-displacement softening and a long-term fitting effect.

This invention relates to the field of concrete pretreatment technology, specifically to a cenosphere drying device for aerated concrete slurry preparation. The device includes a cavity and a blind plate, heating components, and a premixing mechanism disposed within the cavity. The blind plate has a stepped structure. The premixing mechanism includes an exhaust pipe, a washing tower, and a monitoring component. By utilizing a quantitatively prescribed amount of water (which must be added to the aerated concrete itself) as the tail gas washing liquid in the washing tower, intact cenospheres that escape upwards are trapped. By configuring a monitoring component at the discharge end, the actual mass of solid cenospheres carried in the premixed suspension can be calculated in real time. This successfully transforms previously unrecognizable muddy water, which could only be considered environmental wastewater, into a pre-slurry with absolutely accurate and clear water and material data, eliminating drying dust while enabling the non-destructive quantitative recovery of scattered cenosphere aggregates.

The application discloses a kind of positive pressure melting, homogenization method for improving the yield of hollow glass microsphere, belong to the technical field of hollow glass microsphere preparation, including glass batch ingredient, temperature melting, homogenization, water quenching, crushing classification, powder conveying, hollow spheroidization, collection sorting, also include pressurization processing, before temperature melting, first melt furnace is pressurized, control furnace pressure is at 101000Pa-130000Pa, 0.5-1 hour is used;Then temperature melting, temperature 1450~1550 DEG C, melting time 6~7 hours, and carry out stirring homogenization, after homogenization, melt furnace is discharged gas, adjust the air pressure balance in furnace.The application has the advantages that: batch ingredient is pressurized melting, stirring homogenization, realize the uniformity and completeness of reaction between batch ingredient, reach the best melting, homogenization effect, obtain bubble glass liquid absorption better powder method preparation hollow glass microsphere with high-quality glass raw material.

The application discloses light-weight dense-silica hollow sphere heat-insulating material and a preparation method and application thereof, and belongs to the technical field of novel heat-insulating materials.The application uses a special SiO2 hollow sphere structure, uses inorganic adhesive to bond, and makes the SiO2 hollow spheres tightly combine in a sintering process, thereby significantly improving the volume of air in the material, solving the problem of strong hygroscopicity caused by the fibrous aerogel material in the prior art, and being simple in the preparation steps, cheap and easy to obtain in raw materials, and being conducive to realizing large-scale production and being applicable to the field of aviation.

The invention discloses a corundum refractory material for a solid waste incinerator and a preparation method of the corundum refractory material. The corundum refractory material comprises a hollow sphere matrix prepared from corundum, alpha-alumina micro powder, chromium oxide green and an auxiliary agent and a composite hydrogen-resistant coating coated outside the hollow sphere matrix, the auxiliary agent is prepared from pyrophyllite, zirconium oxide, yttrium oxide and cerium oxide; the method comprises the following steps: S1, preparing the hollow sphere substrate; S2, coating the composite hydrogen-resistant coating; by preparing the composite hydrogen-resistant coating with a multi-layer structure, the effects of preventing hydrogen permeation, reducing the hydrogen embrittlement phenomenon, improving the anti-stripping performance of the material under the condition of rapid cooling and rapid heating circulation and providing good corrosion resistance are achieved.

The application relates to the technical field of gas sensor gas-sensitive materials, in particular to a nitrogen dioxide gas-sensitive material based on VTe2 and a preparation method and application thereof. The gas-sensitive material comprises VTe2, the VTe2 is in a hollow spherical structure composed of two-dimensional nanometer thin sheets, the thickness of the two-dimensional nanometer thin sheets is 40-60 nm, and the gas-sensitive material is prepared by one-step hydrothermal method or solvothermal method. The gas-sensitive material provided by the application has good gas sensitivity and selectivity to NO2 gas, can be used for detecting trace NO2 in the environment, the gas-sensitive sensing element prepared by using the gas-sensitive material has good selectivity to NO2 gas, excellent gas-sensitive performance, small influence by environmental humidity, good long-term stability, and good adsorption and desorption to NO2 gas, and can be used for multiple gas detections in a short time.

The invention relates to an alumina-based corundum mullite hollow sphere with a gradient structure and a preparation method of the alumina-based corundum mullite hollow sphere, and belongs to the field of heat-insulating refractory materials. The preparation method comprises the following steps: firstly, carrying out mineral separation and grading homogenization on high-alumina bauxite, then uniformly mixing III-grade high-alumina bauxite, silica, a mixed additive and an organic binding agent according to a certain mass percent, and carrying out granulation; the preparation method comprises the following steps: by taking spherical particles as cores, sequentially wrapping II-grade high-alumina bauxite and I-grade high-alumina bauxite under the rotation of a pelletizer, so as to obtain heterogeneous spherical particle blanks rich in SiO2 inside; and calcining at high temperature to finally obtain the corundum mullite hollow sphere with the gradient structure. The refractory hollow sphere is subjected to gradient structure design through a combined process of grading homogenization, coating forming and high-temperature calcination in-situ pore forming of high-alumina bauxite, phase performance characteristics of corundum and mullite are fully utilized, and the refractory hollow sphere which is low in heat conductivity coefficient, good in erosion resistance, high in use temperature and excellent in thermal shock resistance is developed.