50results about How to "High closed porosity" patented technology

The invention relates to a micro closed-cell light-weight corundum refractory aggregate and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: by using 45-65 wt% of gamma-Al2O3 fine powder, 30-50 wt% of alpha-Al2O3 micropowder and 1-10 wt% of nano aluminum oxide micropowder as raw materials, adding water accounting for 40-80 wt% of the raw materials, and carrying out wet milling with a planet ball mill for 0.5-3 hours; putting the slurry subjected to wet milling in a mold, standing at room temperature for 12-24 hours, and stripping; and drying at 110-200 DEG C for 12-36 hours, and keeping the temperature at 1750-1900 DEG C for 1-8 hours to obtain the micro closed-cell light-weight corundum refractory aggregate. The micro closed-cell light-weight corundum refractory aggregate has the characteristics of low apparent porosity, high closed porosity, low volume density, small average pore size, lower heat conductivity and high molten slag erosion resistance.

The invention relates to lightweight micro closed cell magnesium-containing corundum refractory aggregate and a preparation method of the refractory aggregate. The method comprises the steps of taking 80-95wt% of gamma-Al2O3 fine powder, 1-10wt% of nano alumina powder and 1-10wt% of magnesium oxide micropowder as raw materials, adding water accounting for 40-70wt% of the raw materials, mixing, wet-milling with a planet ball mill for 0.5-3h to form slurry, putting the slurry in a mold, placing under a room temperature condition for 12-24h, removing the mold, drying a demolded green body for 12-36h at 110-200 DEG C, and carrying out heat preservation for 1-8h at 1750-1900 DEG C to form the lightweight micro closed cell magnesium-containing corundum refractory aggregate. The prepared lightweight micro closed cell magnesium-containing corundum refractory aggregate has the characteristics of low apparent porosity, high closed porosity, lower volume density, small mean pore size, lower heat conductivity, and strong washout and slag erosion resistance.

The invention relates to a high-strength pore-closed mullite material and a preparation method thereof. The material comprises, by weight, 30-84wt% of alumina raw material, 1-55wt% of alumina-silica raw material, 15-60% of silica raw material and 2-10wt% of additive. The preparation method includes: mixing the raw materials according to the above proportion, adding the additive, stirring well, and pouring into a die; performing mechanical pressing under 80-150MPa to obtain a blank, and drying the blank at 60-140 DEG C for 3-16h; putting the blank in a high-temperature kiln for calcining to obtain the high-strength pore-closed mullite material. Sintering in-situ pore forming technology is adopted, so that the high-strength pore-closed mullite material prepared by the method has the advantages of high closed porosity, high pressure-resistant strength and high refractoriness under load and can be used for a long time at high temperature of 1550-1700 DEG C.

The invention relates to a light-weight composite corundum refractory aggregate, and a preparation method for the light-weight composite corundum refractory aggregate. According to the technical scheme, the preparation method comprises the following steps: taking 80-95 wt% of gamma-Al2O3 fine powder, 1-10 wt% of Al(OH)3 micro powder, 1-10 wt% of a glycopolymer and 0.1-5 wt% of an antifreeze protein as raw materials, adding 20-60 wt% of water, and conducting wet grinding; pelleting slurry obtained after wet grinding into particles with the grain sizes being 1-2.5 mm through a disk, freezing, drying, and keeping the temperature for 3-6 h at the temperature of 300-800 DEG C to obtain porous corundum particles; then taking 80-97 wt% of alpha-Al2O3 micro powder, 2-10 wt% of nanometer aluminium oxide sol, and 1-5 wt% of MgO micro powder as mixtures, adding 30-50 wt% of organic alcohol, and conducting mixed grinding; pelleting the slurry obtained through mixed grinding and the porous corundum particles into particles of which the grain sizes are 3-10 mm, drying, and sintering for 1-5 h at the temperature of 1,700-1,900 DEG C, so as to obtain the light-weight composite corundum refractory aggregate. The light-weight composite corundum refractory aggregate product prepared by the invention is low in volume density, high in closed porosity, and high in slagging corrosion resistance.

The invention relates to a foam glass ceramic composite building thermal insulation material and a preparation method thereof. The material comprises a hydrated glass substrate, a crystal phase mineral and inorganic fibers. The preparation technology includes hydrated glass substrate preparation by a wet chemical method, crystal phase mineral and inorganic fiber blending, low-temperature foaming and dehydroxylation heat treatment. The material is excellent in physical and chemical property and fireproof performance, has moderate open pore rate and breathing humidity controlling behaviors and meets grade-A non-combustible standards. Raw materials are wide in variety and low in cost, the preparation process is green and environmentally friendly, and the material is applicable to thermal insulation of building walls.

The invention provides a manufacturing method of an artificial inorganic imitated stone texture decorative plate, the modified cellulose is prepared from the wheat straw and the corn straw, and the mechanical property of the decorative plate is improved through the synergistic effect of the modified cellulose, the coal ash and the white carbon black; foamed glass is prepared by uniformly coating the surfaces of hollow glass beads with a layer of graphite-like phase carbon nitride, and the foamed glass is pressed on the main body mixture to form a thermal insulation layer, so that the high temperature resistance and flame retardance of the decorative plate are improved; by adding and rographolide and radix isatidis, the mildew-proof and antibacterial properties of the decorative plate are improved; the insulating layer is coated with an imitated stone coating. The decorative plate produced by the method realizes reasonable matching of high strength, obdurability, high temperature resistance and water resistance, and has the advantages of lower production cost, higher process applicability, higher operability, controllable product quality and the like.

The invention discloses a thermal insulating mortar and a preparation method thereof and belongs to the technical field of preparation of building materials. The thermal insulating mortar is preparedfrom the following raw materials including silicate cement, coal ash, limestone powder, polystyrene particles, bentonite, thickener, heavy calcium carbonate powder, tackifier, carboxyethyl methylcellulose, lauryl sodium sulfate, calcium fluoride, styrene maleic anhydride copolymer and organosilicon-polyurethane copolymer, sodium carbonate and hydrochloric acid through the steps of mixing, stirringand the like. The thermal insulating mortar can improve the compressive strength and reduce dry apparent density, heat conductivity coefficient and water absorption per volume.

The invention discloses microporous foamed glass prepared by taking waste glass as a main raw material. The microporous foamed glass is prepared from the following components in percentage by mass: 62.8 to 77.0 percent of waste glass, 7.3 to 16.8 percent of albite, 4.0 to 11.8 percent of hollow glass beads, 0.1 to 0.3 percent of sodium nitrate, 0.01 to 0.12 percent of calcium carbonate, 0.6 to 3.0 percent of borax, 3.1 to 9.5 percent of boric acid and 0.25 to 1.2 percent of fluorite. The true density of the hollow glass beads is 0.15-0.18 g/cm<3>, and the particle size of the hollow glass beads is 10-85 [mu]m. The preparation method comprises the following steps: firstly preparing a blank material, heating the blank material in a high-temperature furnace to 780-860 DEG C at a speed of 5-8 DEG C/min, preserving heat for 30-50 minutes, and then conducting cooling along with the furnace to obtain the microporous foamed glass. The hollow glass beads are adopted as a physical foaming agent, abnormal holes in the foaming process are effectively avoided, the prepared microporous foamed glass is low in volume weight, the closed porosity is larger than or equal to 91%, and the aperture less than 80 [mu]m, and the compressive strength and the thermal insulation performance of the material are remarkably improved.

The invention discloses foamed ceramic based on Muyu stone tailings. The foamed ceramic comprises the following components in percentage by mass: 60-85% of the Muyu stone tailings, 9-20% of quartz, 5-25% of feldspar and 0.1-0.4% of a foaming agent. The Muyu stone tailings are used as a main raw material, various low-grade raw materials are used as auxiliary materials, and the formula composition and the preparation process are optimally designed, so that the mechanical properties and the thermal insulation property of the obtained foamed ceramic product can be effectively considered. The obtained foamed ceramic has the advantages of being high in closed porosity, good in decorative effect, good in heat preservation, heat insulation and fireproof performance and the like, high-additional-value utilization of the high-doping-amount muyu stone tailings can be achieved, and remarkable environmental and economic benefits are achieved.

The invention provides a method for preparing high-closed-porosity cordierite-aluminium phosphate ceramic. The method is characterized by including the following steps that (1), aluminium dihydrogen phosphate and aluminium nitrate are dissolved in water, and a solution is prepared; (2), the prepared solution is dropped onto the surface of porous cordierite ceramic at room temperature till the porous cordierite ceramic achieves adsorption saturation; (3), the porous cordierite ceramic on which the mixed solution is adsorbed is dried at the temperature of 50 DEG C; (4), a dried product is heatedto 1,150 DEG C in the atmosphere and subjected to heat preservation for 2 hours, then the dried product is cooled to 800 DEG C at the speed of 5 DEG C/min and subjected to heat preservation for 2 hours, finally the product is naturally furnace-cooled to room temperature, and the high-closed-porosity cordierite-aluminium phosphate ceramic is prepared, wherein the open porosity is not higher than 10% and the closed porosity is 39% to the maximum degree.

The invention provides micro-pore dead burned high-calcium magnesite. The micro-pore dead burned high-calcium magnesite is prepared from the following raw materials: 50 to 70 weight percent of light burned magnesium powder, 25 to 40 weight percent of light-burned dolomite powder and 5 to 10 weight percent of an additive, wherein the additive is carbonate micro-powder and the D50 value of the additive is 50 to 500nm. The micro-pore dead burned high-calcium magnesite has the beneficial effects that 1) the added carbonate micro-powder is decomposed at high temprature to generate carbon dioxide and remain a lot of air pores by adopting a carbonate micro-powder in-situ decomposition method, the added micro-powder is nano-grade micro-powder, almost air pores generated by decomposition are sealedair pores and have a small air pore diameter; components of the added carbonate micro-powder are the same as main components and impurity components are not introduced; 2) the micro-pore dead burnedhigh-calcium magnesite provided by the invention is detected to find out that the volume density is 2.80 to 3.05g/cm<3>, the porosity is greater than 3.0 percent, the ratio of the closed porosity to the total porosity is greater than 60 percent and the average pore diameter is 0.05 to 0.3mum; and 3) the dead burned high-calcium magnesite provided by the invention has the characteristics of low volume density, small average pore diameter, high closed porosity, low heat conductivity, good thermal shock stability and strong washing-out resisting and molten slag erosion resisting capabilities.

The invention relates to a light-weight equal-diameter micro-porous corundum complex-phase sphere and a preparation method thereof. The preparation method includes the following steps: (A) employing 90-99 wt% of Al2O3 micro-powder and 1-10 wt% of MgO micro-powder as raw materials, adding a saccharide polymer accounting for 5-15 wt% of the raw materials, and mixing the components in a planetary ball mill; (B) adding water accounting for 6-20 wt% of the raw materials, performing rotary granulation to obtain pre-fabricated spheres; (C) mixing aluminum oxide sol and [rho]-Al2O3 micro powder according to mass ratio of (0.04-0.1):1 to prepare slurry, spraying the slurry uniformly onto the surfaces of the pre-fabricated spheres, wherein a ratio of the thickness of the slurry sprayed onto the surfaces of the pre-fabricated spheres to the radials of the pre-fabricated spheres is (0.05-0.12):1; and (D) drying the spheres and calcining the spheres at 1900-2100 DEG C for 2-5 h in an ultrahigh-temperature vertical kiln to prepare the light-weight equal-diameter micro-porous corundum complex-phase sphere. The light-weight equal-diameter micro-porous corundum complex-phase sphere is low in volume density and is less in average pore diameter, is high in closed porosity, is low in heat conductivity, is good in thermal shock stability, is washing-resistant and is strong in anti-slag-erosion capability.

The invention provides a method for preparing high-closed-porosity aluminium oxide-aluminium phosphate ceramic. The method is characterized by including the following steps that (1), aluminium dihydrogen phosphate and aluminium nitrate are dissolved in water, and a solution is prepared; (2), the prepared solution is dropped onto the surface of porous aluminium oxide ceramic at room temperature till the porous aluminium oxide ceramic achieves adsorption saturation; (3), the porous aluminium oxide ceramic on which the mixed solution is adsorbed is dried at the temperature of 50 DEG C; (4), a dried product is heated to 1,150 DEG C in the atmosphere and subjected to heat preservation for 2 hours, then the dried product is cooled to 800 DEG C at the speed of 5 DEG C/min and subjected to heat preservation for 2 hours, finally the product is naturally furnace-cooled to room temperature, and the high-closed-porosity aluminium oxide-aluminium phosphate ceramic is prepared, wherein the closed porosity is 39% to the maximum degree.

The invention relates to a method for preparing a high closed porosity forsterite-aluminium phosphate ceramic. The method is characterized by comprising the following steps: (1) dissolving aluminium dihydrogen phosphate and aluminium nitrate in water to prepare a solution; (2) dropping the prepared solution on the surface of a porous forsterite ceramic at room temperature until the porous forsterite ceramic reaches adsorption and saturation; (3) drying and adsorbing the porous forsterite ceramic of the mixed solution at 50 DEG C; and (4) heating the dried product to 1,150 DEG C under the atmosphere and preserving heat for 2 h, and cooling to 800 DEG C at the speed of 5 DEG C/min and preserving heat for 2 h, and finally naturally cooling to room temperature along with a furnace, thereby preparing the high closed porosity forsterite-aluminium phosphate ceramic. The high closed porosity forsterite-aluminium phosphate ceramic is not higher than 10% in open porosity, and is 39% in maximum closed porosity.