69results about How to "No need for high temperature calcination" patented technology

The invention discloses a nano additive modified high strength wall self heat preservation brick and a preparation method thereof. The method comprises the following steps: according to mass portion, 1 to 20 portions of bonding agent, 0.1 to 5 portions of admixture and 0.5 to 5 portions of nano additive are evenly mixed and added with admixtures, the weight of which is 0.001 to 0.1 times against the weight of the mixture, and evenly mixed again; and the mixture obtained is added with water and shaped. For the wall self heat preservation brick prepared by the method of the invention, the pressive strength is between 5 and 14MPa, the coefficient of thermal conductivity is between 0.1 and 0.2w/m.k, so that the brick is a highly efficient energy saving building material with superior performance.

The invention relates to preparation and application methods of a high-efficiency composite photocatalytic material MoS2/SrTiO3. The photocatalytic material is formed by compounding strontium titanate and molybdenum disulfide through a secondary hydrothermal method. The preparation method comprises the following steps: mixing isopropyl carbonate and citric acid, respectively dropwise adding a strontium nitrate solution and a sodium hydroxide solution under ultrasonic stirring conditions to obtain a precursor, heating the obtained precursor in a hydrothermal kettle, and washing and drying a product, thereby obtaining nano strontium titanate; fully mixing strontium titanate with a molybdenum disulfide precursor solution, heating in the hydrothermal kettle, and washing and drying a product, thereby obtaining the photocatalytic material MoS2/SrTiO3. The photocatalytic material is simple in preparation method, does not need high-temperature calcining, is low in cost and recyclable, is capable of efficiently degrading methyl orange or organic dyestuffs with similar developing groups with the methyl orange, and has wide application prospects in the field of treatment of wastewater containing the organic dyestuffs.

The invention discloses a preparation method of pollucite sub-microspheres with kilogram yield grade. The preparation method is characterized by comprising the following steps: firstly, taking solid raw materials such as amorphous silica, amorphous alumina, metakaolin and cesium hydroxide monohydrate, and adding the solid materials into a autoclaved reaction kettle; secondly, taking deionized water according to the weight ratio of the solid materials to the deionized water being 1 to (15 to 20) and then adding the deionized water into the autoclaved reaction kettle; thirdly, reacting for 4 to 20 hours under the conditions that the temperature is 140 to 200 DEG C, the pressure is 0.3 to 0.8MPa and the stirring speed is 60 to 100r/min, then cooling and filtering; washing solids with water and then drying to obtain the pollucite sub-microspheres. According to the preparation method disclosed by the invention, synthesis and preparation of the pollucite sub-microspheres with the kilogram grade under mild conditions are realized; the preparation method is suitable for industrial scale production. The prepared pollucite sub-microspheres can be used for preparing a ceramic container for storing a cesium radioactive source core material or radioactive wastes, and also can be used for high-temperature-resisting ceramics in the field of aerospace.

The invention provides a method for preparing ABO3 perovskite nano powder. The method comprises the following steps: dropwisely adding a B-site element source alcohol solution into surfactant/acetic acid-dissolved deionized water to obtain a mixed solution, adding ammonia water into the mixed solution, and reacting the reaction system at constant temperature to obtain a B-site element hydrous oxide gel; and preparing a B-site element hydrous oxide gel dispersion solution, adding an A-site element source into the dispersion solution, and carrying out hydrothermal reaction under normal pressure to obtain the ABO3 perovskite nano powder. The aqueous gel-normal pressure hydrothermal process and raw materials with lower cost are adopted, and the aqueous reaction is utilized to avoid the toxicity of the organic solvent. The pH value, surfactant amount, reaction raw material concentration, reaction time, reaction temperature and other conditions of the system are regulated to effectively control the size of the product, thereby obtaining the well-crystallized monodisperse perovskite powder with the particle size of 15-300nm.

The invention discloses a method for preparing strontium titanate nano powder through a microwave hydrothermal method. The method includes: mixing titanate, ethanol and acetic acid, adding water solution containing strontium ions in dropwise mode to form sol, then adding alkali, adjusting potential of hydrogen (pH) value of the sol to 8-14, obtaining precursor slurry, placing the precursor slurry in a reaction kettle, performing microwave hydrothermal reaction, and separating and drying reaction products to obtain the strontium titanate nano powder. Compared with a conventional hydrothermal method, the method is rapid in reaction, easy to control, free of high-temperature calcination, simple in device and low in cost. The obtained strontium titanate nano powder is intact in crystallization, even in particle size and narrow in distribution range.

The invention discloses a water permeable brick prepared from alkali-residues and construction waste and a preparation method thereof, belonging to the technical field of construction material preparation. The water permeable brick is prepared from the following substances in parts by weight: 100 parts of alkali residues, 200-800 parts of construction waste, 2-8 parts of silica fume, 5-15 parts of cement, 2-7.5 parts of alkali activator and 18-40 parts of water. The water permeable brick is prepared from industrial waste residues and construction waste, and has high solid waste utilization and low production cost; the molding method adopts press molding, is simple in process, does not need high-temperature calcining, and has the advantages of low carbon, environmental friendliness and low energy consumption; and the gel material is alkali-activated alkali residue gel material to prepare the water permeable brick having the advantages of high strength, high water permeability, low hydration heat, carbonization resistance, good durability and the like.

The invention relates to a method for improving the stability of an Ni-Cu/SiO2 nanocomposite catalyst in methane dry reforming by using mesoporous silica as a carrier and nickel nanocrystal as a mainactive component through copper doping, belonging to the technical field of catalyst preparation. The nanocomposite catalyst is prepared from raw materials like nickel nitrate, sodium silicate and diluted nitric acid by a simple precipitation method through steps of aging, filtering and washing, drying, grinding and reducing; the method provided by the invention has simple preparation process, noneed of high-temperature calcination, cheap and easily available raw materials and low cost; and the catalyst prepared by using the method provided by the invention has the advantages of high catalytic activity, good stability, no significant decrease in activity after reacted under the condition of 700 DEG C for 140 hours, strong capability of resisting sintering and carbon deposition, etc. The catalyst provided by the invention is applied to a methane dry reforming reaction, and provides an effective solution channel for effective utilization of natural gas and emission reduction of CO2.

The invention relates to a method for preparing a photocatalyst with a core-shell structure, which comprises the following steps: (A) activating an acid-resisting non-metallic ore or a non-metallic synthetic compound, and removing acid-soluble impurities; (B) under the synergistic action of hydrochloric acid and a macromolecular compound, moderately hydrolyzing titanium tetrachloride, and preparing the hydrolyzate required for coating a core; and (C) depositing and coating the core and a shell. The invention has the advantage that under the conditions of normal pressure, low temperature and no need of high temperature calcination, 2-8 nanometers of titanium dioxide particles are deposited and coated on the surface of an acid-resisting non-metallic inorganic mineral or a synthetic inorganic compound. The preparation technology not only keeps the high catalytic activity of 2-8 nanometers of titanium dioxide but also eliminates the defect of agglomeration or coating of photocatalytic materials in application systems, such as plastics, paint and the like. Compared with the prior method, the anatase type nano titanium dioxide coated on the surface can form a complete crystal at the temperature lower than 100 DEG C without calcination, thus the invention has simple preparation technology and low energy consumption and is suitable for industrial production.

The invention discloses a method for direct synthesis of Mn<+>-doped SnO2 nanocrystals with a one-step hydrothermal method, wherein the method comprises the following steps: under stirring, slowly dropwise adding an Sn<4+> salt solution into an NaOH solution, and forming a transparent solution; then dropwise adding an Mn<+> salt solution into the above solution, and forming a suspension; transferring the suspension into a high-pressure reaction kettle, adding distilled water, then sealing, putting into an electric heating drying oven, and at the temperature of 140-200 DEG C, carrying out a reaction for 12-36 h; after the reaction is finished and after the high-pressure reaction kettle is naturally cooled, opening the reaction kettle, taking out a precipitate in a polytetrafluoroethylene container, separating, and respectively washing with distilled water and absolute ethyl alcohol, putting the precipitate in a 60 DEG C vacuum drying oven, drying for 4-6 h, and thus obtaining the product. The Mn<+>-doped SnO2 nanocrystals have the advantages of good morphology and regular dimension; and the method has the advantages of simple instrument and equipment, simple process, easily controlled conditions, and green environmental protection.

The invention discloses a multi-solid-waste baking-free steaming-free water permeable brick with a double-layer structure and a preparation method thereof, and belongs to the field of preparation of building materials; the water permeable brick comprises a surface layer and a base layer, and the surface layer is composed of the raw materials in parts by weight: 80-100 parts of steel slag micro powder, 20-30 parts of silica fume, 1-4 parts of epoxy resin, 0.5-2 parts of a curing agent, 0.1-0.5 part of a water reducing agent and 10-20 parts of water; the base layer is composed of the raw materials in parts by weight: 10-20 parts of cement, 80-100 parts of iron ore waste rock, 20-30 parts of iron tailing powder, 0.1-0.5 part of a water reducing agent and 10-20 parts of water; the water permeable brick has the beneficial effects that the solid waste utilization rate is high, resource utilization of solid waste is achieved, the process is simple, high-temperature calcination is not needed,energy consumption is low, the surface layer adopts extremely fine particles, and the situation that the interior of the water permeable brick is blocked due to overlong use time is avoided; and silica fume is added into the surface layer as an excitant, so that the strength and the wear resistance of the water permeable brick are improved.

The invention relates to structure gradient type cement-based water-permeable pavement bricks and a preparation method thereof. Each water-permeable pavement brick is composed of a bottom layer and asurface layer; the thickness of the surface layer is 2 to 15 percent of the total thickness of the water-permeable pavement brick; the bottom layer is prepared from the following components in parts by weight: 300 to 500 parts of a gel material, 1200 to 1800 parts of aggregate, 85 to 120 parts of water, 5 to 15 parts of an additive and 1 to 3 parts of fiber; the surface layer is prepared from thefollowing components in parts by weight: 300 to 500 parts of a gel material, 1200 to 1800 parts of aggregate, 85 to 120 parts of water, 5 to 15 parts of an additive and 0 to 5 parts of a coloring agent. The structure gradient type cement-based water-permeable pavement bricks provided by the invention have the advantages of high strength, good water-permeable performance, simple preparation technology and low cost.

The invention relates to a mesoporous carbon material preparation method, and belongs to the technical field of preparation and applications of a carbon material. Compared with the background art, the mesoporous carbon material preparation method has obvious progresses, a small organic molecule is taken as a carbon source, a Na-K alloy is taken as a reducing agent, methylbenzene is taken as a solvent, the materials are stirred at the room temperature to prepare a reaction solution, the reaction solution is subjected to suction filtration, washing and vacuum drying to prepare a mesoporous carbon material, the process of the preparation method is advanced, the data are full and accurate, the preparation is fast, high-temperature calcination is not needed, the product is a black powder, the black powder has a mesoporous porous structure, the yield of the product is as high as 75.6%, the mesoporous carbon material can be matched with various chemical substances, and the preparation method is a quite ideal method for preparing the mesoporous carbon material.

The invention relates to a titanium dioxide nanosphere which can be prepared by the following method comprising the following steps: (A) dissolving water-soluble organic macromolecules in a 5%-25% hydrochloric acid solution; (B) dripping the mixed solution which is prepared in step A and has the volume which is 1-5 times of the volume of titanium tetrachloride into a titanium tetrachloride solution to obtain brownish-black hydrolyzate; (C) adding a surfactant into the hydrolyzate obtained in step B; and (D) maintaining the temperature of the mixed solution obtained in step C at 50 DEG C-100 DEG C, continuously adding a 15%-20% hydrochloric acid solution according to the volume ratio, and simultaneously adding phosphoric acid, the adding amount of which is 0.1%-3% of the adding amount of the titanium tetrachloride. The invention also provides applications of the titanium dioxide nanosphere in building decoration materials and plastic materials. The invention has the advantage that the antibacterial test and the formaldehyde degrading test prove that the titanium dioxide nanosphere has stronger photocatalytic activity in the ranges of ultraviolet light and visible light.

The invention relates to a rare earth ion doped nano calcium carbonate luminescent material with different morphologies and a preparation method and application thereof, and the luminescent material is prepared by taking natural limestone which is not subjected to any modification treatment as a calcium source and introducing rare earth ions into crystal lattices of synthesized nano calcium carbonate in a carbonization reaction process. The mass ratio of rare earth ions to Ca < 2 + > in the luminescent material is (0.001-0.06): 1; according to the invention, natural limestone is used as a calcium source, the reserves are rich, the cost is reduced, and the additional value of natural minerals is improved; the preparation method is simple in process, low in energy consumption and suitable for industrial production and application; by doping different rare earth ions in the carbonization crystallization process, the morphology of nano calcium carbonate can be changed, luminescent materials with different colors can be obtained at the same time, and the material is a light conversion material with good luminescent characteristics and stability, is applied to the field of optics, and ismainly combined with a near ultraviolet LED chip to prepare a white light LED with high luminescent performance.

Disclosed is an environment-friendly acoustical building panel which is of a double-layer porous structure formed by a surface material layer and a substrate layer. The surface material layer is made from construction waste regeneration fine aggregate, coal gangue, cement, lime and slurry; the substrate layer is made from the construction waste regeneration fine aggregate, the cement and the slurry. The environment-friendly acoustical building panel with solid waste of the slurry, the coal gangue and the like as main materials is of the porous structure, even pores are arranged in the surface and the interior of the material, and the acoustical effect of the material is higher when porosity is higher.

The invention belongs to the field of magnetic composite photocatalytic materials, and in particular relates to a ZnFe2O4/Bi7O9I3 magnetic composite photocatalytic material and a preparation method thereof. The preparation method comprises the following steps of: firstly, inserting ZnFe2O4 magnetic nanoparticles into a micron-sized flower-like structure formed by Bi7O9I3 nanosheets to form a composite structure in which particles are inserted into micron flowers; wherein the size of the ZnFe2O4 nanoparticles is 20-80nm, the thickness of the Bi7O9I3 nanosheet forming the Bi7O9I3 micron flowersis 5-10nm; ZnFe2O4 and Bi7O9I3 are compounded according to a mass ratio of 1:(2-6), the formed magnetic composite photocatalytic material shows superparamagnetism, is high in saturation magnetizationintensity, strong in photocatalytic activity and strong in magnetic separability, has good visible light degradation capability on a target pollutant bisphenol A, and can be quickly recycled through an external magnetic field to achieve the purpose of recycling for multiple times; and the preparation method of the magnetic composite photocatalytic material is reliable in principle, simple, easy tocontrol, green, safe, free of high-temperature calcination, conventional in equipment and low in cost, and has the industrial prospect of large-scale production.

The invention provides a preparation method of particle spherical lanthanum titanate. The method comprises the following steps: under a stirring condition, adding 10 to 20 parts of a lanthanum source-water mixed solution into 40 to 50 parts of a titanium source-alcohol mixed solution; adding sodium hydroxide into the solution and magnetically stirring for 20min to 30min; then transferring a mixture into a reaction kettle and raising the temperature to 180 DEG C to 220 DEG C; reacting for 3h to 48h; standing to room temperature; after removing supernatant, adding a sediment part into a reactor containing 100 parts of a hydrochloric acid solution; after stirring for 20min to 30min, washing with water; centrifugally separating; drying at 60 DEG C to 100 DEG C to obtain white powder, namely the particle spherical lanthanum titanate. The method provided by the invention has the advantages of simple process, low cost, uniform components and a novel shape.