6225 results about "Aluminium hydroxide" patented technology

A method for extracting silicon dioxide, alumina and gallium oxide from high-alumina fly ash relates to the technology fields of environmental mineralogy and material, chemical industry and metallurgy. The method comprises the main steps as follows: causing the high-alumina fly ash to react with sodium hydroxide solution; filtering the solution; introducing CO2 to the filtrate for full gelation; cleaning, purifying, drying, grinding and calcining the silica gel after gel filtration to obtain finished white carbon black; adding limestone and a sodium carbonate solution into the filter mass after the reaction and filtration of the high-alumina fly ash and the sodium hydroxide solution; ball grinding the mixture into raw slurry; dissolving out the clinker obtained by baking the raw slurry; subjecting the filtrate to deep desiliconization to obtain sodium aluminate extraction liquid; filtrating the sodium aluminate extraction liquid after subjecting the sodium aluminate extraction liquid to carbon dioxide decomposition; baking the aluminum hydroxide after washing the filter mass to form the aluminum hydroxide product; and extracting the gallium oxide from the carbon dioxide decomposition mother solution and desiliconized solution. The method has the advantages of low material price, simple operating procedures, low investment, low production cost, low energy consumption and less slag.

The invention discloses a preparation method for aluminum oxide by a direct forming method. The method is characterized in that the aluminum oxide is directly formed by a wet filter cake, wherein pore volume is 0.3-0.8ml / g; a specific surface area is 150-300 m<2> / g; and crushing strength is 30-120 N / particle; the preparation process comprises the steps: a) meta-aluminate containing aluminum or a strong acid salt compound is neutralized with a precipitator solution at a temperature of 30-80 DEG C and pH of 6-9; accessory ingredient is added in a neutralizing process; mixture is aged for at least 10min after neutralizing; b) prepared aluminium hydroxide gel is washed by de-ionized water for 4-10 times; dosage of the de-ionized water for each time is 10-40 times of mass of a dried substrate of prepared aluminium hydroxide; a hydrated alumina filter cake is obtained after washing and filtering; content of the aluminium hydroxide in the filter cake is controlled to be 5-50%; and c) the accessory ingredient is added into one or various liquid in the step a) and step b); the filter cake after washing is formed by a normal forming method; and the formed filter cake is dried at a temperature of 80-120 DEG C and calcined at a temperature of 450-1000 DEG C to obtain a finished product of the aluminum oxide.

A stabilized catalyst support having improved hydrothermal stability, catalyst made therefrom, and method for producing hydrocarbons from synthesis gas using said catalyst. The stabilized support is made by a method comprising treating a crystalline hydrous alumina precursor in contact with at least one structural stabilizer or compound thereof. The crystalline hydrous alumina precursor preferably includes an average crystallite size selected from an optimum range delimited by desired hydrothermal resistance and desired porosity. The crystalline hydrous alumina precursor preferably includes an alumina hydroxide, such as crystalline boehmite, crystalline bayerite, or a plurality thereof differing in average crystallite sizes by at least about 1 nm. The crystalline hydrous alumina precursor may be shaped before or after contact with the structural stabilizer or compound thereof. The treating includes calcining at 450° C. or more. Preferred structural stabilizers can include cobalt, magnesium, manganese, manganese, zirconium, boron, aluminum, barium, silicon, lanthanum, oxides thereof, or combinations thereof.

A process for extracting aluminum oxide from powdered coal ash includes such steps as grinding, calcining, mixing with H2SO4 solution, heating while reaction for extracting aluminum oxide, boiling in water, concentrating, cooling while educing out aluminum sulfate crystals, heating for dewatering, heating for decomposing to obtain gamma-Al2O3, and further preparing metallurgy-class aluminum oxide.

The invention discloses a method for recovering and recycling waste lithium ion battery cathode material, belonging to the fields of lithium ion battery material preparation and recycling use of waste resources. The method has the technical proposal with the key points as follows: the recovered waste batteries are sorted, cathode waste material (after being sorted) which is stripped to remove the shell and generated in the production process of the lithium ion battery is directly crushed and ground, and then processed by the procedures such as aluminum removing, acid dipping, copper extracting, chemical purification and the like under different conditions, so that byproduct materials such as aluminum hydroxide, carbon black, graphite, copper sulphate and the like are generated; reaction products are added with precipitator with certain concentration for liquid-phase precipitation and then added with lithium source, so that cathode material can be generated in the high temperature environment. The technical proposal successfully realizes the valuable constituent recovery and cathode material regeneration of the waste lithium ion battery cathode material.

The invention belongs to the technical field of tunnel construction, and relates to an alkali-free liquid accelerating agent for tunnel wet jet concrete and a preparation method thereof. The alkali-free liquid accelerating agent is characterized in that aluminium sulphate is adopted to serve as a main accelerating component; aluminium is added to an aluminium sulphate solution to be polymerized in a form of aluminium fluoride; aluminium ions are introduced to the greatest extent so as to reduce other ion introduction; and the accelerating effect is ensured. The alkali-free liquid acceleratingagent comprises the following components in percentage by mass: 30-55% of aluminium sulphate, 5-15% of aluminium hydroxide, 10-30% of hydrofluoric acid, 0.5-5% of water glass, 0-0.2% of stabilizing agent, and the balance of water. For jetting concrete, the alkali-free liquid accelerating agent disclosed by the invention has the positive effects that: ordinary cement can be initially solidified within 2 min in lower doping quantity and finally solidified within 4 min; the 1d strength of cement plaster can achieve above 15 MPa; the 28d compressive strength ratio is more than 100%; and the alkali-free liquid accelerating agent has good adaptability to different types of cements.

The process of preparing alumina includes: the reaction of flyash from circular fluidizing bed and acid to obtain aluminum chloride solution, eliminating silicon impurity, concentrating to crystallize and heating to decompose and to obtain crude alumina product; reaction of crude alumina product and hot alkali solution to obtain sodium aluminate solution; eliminating iron, titanium and other impurity, adding aluminum hydroxide crystal seed into sodium aluminate solution for seed separating decomposition to obtain aluminum hydroxide precipitate; and final calcining aluminum hydroxide to obtain metallurgical alumina. The normal pressure process has no any cosolvent added, and the alumina product has Al2O3 content up to 98 %. The process has small sodium hydroxide consumption, reuse of most of sodium hydroxide, simple operation, low cost, low power consumption, capacity of reducing flyash pollution and other advantages.

The invention discloses a silicone rubber for a composite insulator, wherein the silicone rubber comprises the following raw materials in parts by weight: 30-50 parts of methyl vinyl silicone rubber A, 50-70 parts of methyl vinyl silicone rubber B, 25-50 parts of fumed silica, 100-130 parts of aluminium hydroxide, 1-6 parts of silane coupling agent, 0.2-2 parts of ultraviolet absorber, 2-6 parts of zinc oxide, 0.5-3 parts of triethanolamine, 0.2-1 parts of stearic acid, 0.5-2 parts of hydrogen-containing silicone oil, 0.2-1 parts of vinyl silicone oil, 0.5-3 parts of color masterbatch rubber, 2-6 parts of hydroxyl silicone oil and 0.5-1 parts of vulcanizing agent. The silicone rubber provided by the invention can achieve the following performances: the tensile strength is larger than 4 MPa; the breaking elongation is larger than 350%; the peel strength is larger than or equal to 12 KN.m<-1>; the shore hardness is 60+ / -5 degrees; the thermal aging tensile strength retention is larger than or equal to 90%; the anti-creep track passes a grade of 1A4.5; the flame retardance reaches a grade of FV-0; the average static contact angle is larger than 105 degrees; the electrical surface resistivity is larger than 2*10<15> omega; the dielectric constant is smaller than 3.8; and the dielectric loss angle tangent is smaller than 0.01.

The invention discloses an alumina carrier and a preparation method thereof. In the alumina carrier, aluminum hydroxide gel prepared by a molten salt supersolubilizing micelle method is taken as a raw material. After a surfactant and a hydrocarbon component contained in the gel are molded and baked, nano-alumina particles formed by removing water from the polymerized aluminum hydroxide still have a basic rod-shaped structure and are piled up in an unordered way so as to form a frame structure. The alumina carrier has the characteristics of large pore volume, large pore diameter, high porosity, large orifice on the outer surface and high pore canal penetrability. In particular for macromolecules, the alumina carrier prevents catalyst inactivation caused by the blocking of an ink bottle-shaped orifice, so that impurity deposition is increased, and the running period of a catalyst is prolonged. The alumina carrier can be applied to a catalytic reaction which contains a macromolecule reactant or a macromolecule product.

A hydrogenation catalyst and its preparation and use are disclosed. The said catalyst consists of NiO 10-30wt.% and Al2O3 70-90wt.%, obtained by: drying quasi-hydrated aluminum oxide powder, passing steam to ream, roasting to have macroporous aluminum oxide carrier, dipping it in a solvent containing nickel compound, filtering, drying, roasting to form the final product. It is suitable for fractional oil containing dialkene and styrene and their derivatives to directly prepare solvent with high aromatic hydrocarbon and gasoline with high octane level by hydrogenation.

A process for extracting alumina from powdered coal ash while generating white carbon black includes such steps as grinding powdered coal ash, activating, adding ammonium sulfate, reacting, adding water, filtering, filling ammonia gas into the filtered liquid to obtain the deposited mixture of aluminum hydroxide and iron hydroxide, adding the solution of sodium hydroxide to dissolve the aluminum hydroxide deposit, adding carbon to obtain pure aluminum hydroxide, and calcining to obtain Al2O3.

A process for preparing superfine aluminium hydroxide includes such steps as carbonifying reaction between NaAlO2 solution and the gas containing CO2 in gravitation condition to obtain aluminium hydroxide gel, preparing superfine aluminium hydroxide, filtering, washing, and drying. The product (nanofibers or nanoparticles of aluminium hydroxide) can be used as inorganic flame-retarding agent or for preparing catalyst.

A positive electrode active material for a non-aqueous electrolyte secondary battery of this invention includes: a lithium nickel composite oxide containing lithium, nickel, and at least one metal element other than lithium and nickel; and a layer containing lithium carbonate, aluminum hydroxide, and aluminum oxide, the layer being carried on the surface of the lithium nickel composite oxide. The lithium nickel composite oxide is composed such that the ratio of the nickel to the total of the nickel and the at least one metal element is 30 mol % or more. The layer is composed such that the amount of the lithium carbonate is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide. The total of aluminum atoms contained in the aluminum hydroxide and the aluminum oxide is 0.5 to 5 mol per 100 mol of the lithium nickel composite oxide.

The invention relates to a high-molecular composite material having performances of high heat conduction and high flame retardation, the invention is characterized in that the composite material does not contain any halogen or a non environmentally-friendly heavy metal fire retardant, the flame resistance is capable of reaching a UL94 V0 standard, simultaneously, the composite material has good heat conducting performance, the heat conduction coefficient is more than 0.5 W / m. DEG C. The composite material provided in the invention has good injection moulding performance, extruding performance and hot pressing performance. The composite material comprises the following basic components: 1) one or a plurality of metal hydroxides, such as aluminum hydroxide, magnesium hydroxide, zinc hydroxide and the like, wherein the weight content is 10-70%, 2) about 0.2%-60% of the weight content of expandable graphite flaky powder, the lamina size is more than 10 um, and the expandable coefficient is more than or equal to 20 times; 3) 15%-70% of the weight content of matrix resins, such as epoxy resin, organic silicone resin, phenolic resin, thermosetting polyester resin and thermoplastic resins of nylon 6, nylon 66, PBT, PP, HDP and the like. The composite material component of the invention can be directly used for radiators such as LED, electric appliances and electronic components, the heat can be radiated into colder environment so that the operating temperature of the electronic device can be reduced.

The invention relates to a flameproof, essentially halogen-free polymer composition, containing the following: a) 100 parts by weight of a thermoplastic, cross-linkable or cross-linked, elastomeric and / or duroplastic polymer; b) 10 to 200 parts by weight of magnesium, calcium, zink and / or aluminiumhydroxide and / or their double hydroxides; c) 1 to 50 parts by weight of an organic intercalated sheet silicate.

A media for removal of heavy metals from an aqueous system comprising a mixture of nano alumina fibers and a ferric or manganic compound selected from the group consisting of hydroxides, oxyhydroxides, oxides and hydroxyoxides and mixtures thereof. The nano alumina is preferably produced by hydrothermal digestion of aluminum hydroxide, is treated with alkaline, followed by the addition of a ferric or manganic salt to form a gel like mass that is dried, heat treated, ground and sieved to form the sorbent. Alternatively a non-woven media is formed by adding mineral fiber such as microglass to the hydrothermal step. The resulting mulch is treated with alkaline and subsequently an iron and / or manganic compound, wet laid and dried to form the fibrous sorbent. Removal of heavy metals from the aqueous system is readily accomplished by contacting the aqueous system with the media until the heavy metal is substantially removed from the aqueous system.

The present invention relates to a shaped solid acid catalyst for the isomerization of hydrocarbons and so on, which has a high activity and is excellent in strength and easily handleable, and processes for the preparation thereof. This catalyst comprises a support comprising portions of zirconia having a tetragonal form and portions of alumina, and a sulfureous component and, if necessary, a Group 8, 9 or 10 metal component both being supported on the support, and has a specific surface area of 150 m2 / g or above. The catalyst can be prepared by kneading aluminum hydroxide, zirconium hydroxide and a sulfureous compound, shaping the kneaded mixture, calcining the shaped material at such a temperature as to form tetragonal zirconia and, if necessary, supporting a Group 8, 9 or 10 metal component on the calcined material and calcining the resulting molding at 300 to 700° C.

A process for preparing the active aluminium oxide includes preparing the solution of sodium metaaluminate from powdered aluminium hydroxide and sodium hydroxide, introducing high-concentration CO2 gas mixture, colloidizing at 20-70 deg.C, regulating pH=9-11, filtering, washing the filtered cake, drying at 60-100 deg.C to obtain alpha-AlO(OH), and calcining at 500-700 deg.C. Its advantages are high reaction speed, low CO2 consumption and low cost.

The invention discloses a method for producing alumina by disposing and utilizing industrial solid wastes, in particular to a method for preparing alumina by fly ash, comprising the steps as follows: the fly ash is mechanically activated; the activated fly ash, water and concentrated sulfuric acid react in a reaction kettle under the conditions of heating and pressurizing; the solid is separated from the liquid after the temperature of the reaction is reduced so as to gain aluminium sulfate liquid; the aluminium sulfate liquid is evaporated, concentrated and cooled so as to precipitate aluminium sulphate crystals; the aluminium sulphate crystals are dehydrated and decomposed to gain gama-Al2O3 and SO3; coarse gama-Al2O3 is dissolved in alkaline solution; after the solid is separated from the liquid, the pure sodium aluminate solution is gained; aluminum hydroxide crystal seed is added to the sodium aluminate solution so as to precipitate the aluminum hydroxide; the coarse gama-Al2O3 can be prepared by circularly dissolving the seed-precipitated alkaline solution after vaporization-concentration; the metallurgical alumina can be gained by baking the prepared aluminum hydroxide. The method adds no additive, can lead the alumina in the fly ash to be effectively leached out with the leaching rate more than 90% and saves the energy resource.

The invention discloses a method for producing superfine aluminium hydroxide and aluminium oxide by taking flyash of a recirculating fluidized bed as a raw material. The method comprises the following steps of: a) grinding the flyash, performing wet magnetic separation and deironization, and reacting with hydrochloric acid to obtain hydrochloric acid extract; b) introducing the hydrochloric acid extract into a macroporous cationic resin column for adsorption, after adsorptive saturation of the resin, eluting by using an eluant to obtain eluent containing aluminium chloride and iron chloride; c) removing iron from the eluent by using alkaline solution to obtain solution of sodium metaaluminate; d) adding a dispersing agent into the solution of sodium metaaluminate, and mixing uniformly to obtain dispersion; and e) performing carbon decomposition on the dispersion to obtain the superfine aluminium hydroxide. The superfine aluminium hydroxide is calcined at different temperatures to form gamma-aluminium oxide and alpha-aluminium oxide respectively. Compared with other methods, the method has the advantages of wide sources of raw materials, simple production process and high purity of the products.

The invention discloses a method for dissolving red mud. The method comprises the following specific steps of: mixing Bayer process red mud with white lime in the mass ratio of 1:(0.3-0.9); stirring at the temperature of 80-140 DEG C for reacting for 1-15 hours for calcifying, transforming and dealkalizing; mixing calcified, deformed and dealkalized Bayer process red mud with clear water or a low-concentration sodium aluminate solution in an enclosed container; introducing CO2 into the container to obtain calcified slag containing calcium silicate, calcium carbonate and aluminum hydroxide serving as main components; and extracting aluminum hydroxide from the calcified slag by using a sodium hydroxide solution or an aluminum hydroxide solution. In the method disclosed by the invention, the structure and composition of red mud are changed by adopting calcification transformation and pressurizing calcification transformation methods, so that dealkalization and extraction of aluminum can be realized; and iron is extracted properly, so that the structure and the composition of red mud can meet the requirements of cement production, and the aim of dissolving red mud on a large scale at low cost is fulfilled.

The invention discloses a radiation cross-linked low-smoke halogen-free red phosphorus-free flame retardant material, which comprises the following components of: by weight, 10-80 parts of ethene-vinyl acetate copolymer, 5-30 parts of ethylene-octene copolymer and / or ethene-butene copolymer and / or terpolymer EP rubber, 0-100 parts of polyethylene, 1-20 parts of a polymer compatilizer, 0.5-10 parts of organosilicon polymer, 1-10 parts of a composite anti-oxidant, 0-200 parts of aluminium hydroxide and / or magnesium hydroxide and / or modified aluminium hydroxide and / or modified magnesium hydroxide, 0.1-100 parts of high molecular weight ammonium polyphosphate and / or 0.1-50 parts of a phosphate ester fire retardant and / or 0.1-50 parts of MCA. The material provided by the invention reaches American UL224VW-1 standard when applied in thermal shrinkable tubes, reaches American UL1581VW-1 standard when applied in electric wires and cables, contains no halogen or red phosphorus, and is environmentally friendly.

The invention discloses a polymeric aluminum sulfate synthesis method and discloses a preparation method of a novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate. According to the alkali-free accelerator, an aluminum sulfate solution is neutralized by ammonia water, active aluminum hydroxide gel is prepared, active aluminum hydroxide is filtered, dried and ground into powder, then the aluminum sulfate solution is added, and the polymeric aluminum sulfate is prepared. The alkali-free accelerator comprises, in percentage, 45%-55% of the polymeric aluminum sulfate, 0%-5% of inorganic acid, 0%-2% of a stabilizer, 0%-2% of an organic early strength agent, 0%-2% of an organic tackifier and the balance of water. The cement setting time and the colloidal mortar strength of the accelerator can meet the requirement of first-class accelerators for JC477-2005 sprayed concrete under the condition of the lower mixing amount, and meanwhile, the accelerator is an alkali-free liquid accelerator and can effectively avoid adverse effects caused by excessively high alkali content. The cement types of the accelerator have good adaptability.

The invention discloses an extinguishing agent. The extinguishing agent is formed by mixing and stirring strong hydrophobic solid particles and aqueous solution at high speed, wherein the strong hydrophobic solid particles are one type or more of magnesium hydroxide particles, silicon dioxide particles, calcium carbonate particles, talcum particles, aluminium oxide particles, aluminium hydroxide particles, zinc borate particles, zinc oxide particles, iron sesquioxide particles, titanium dioxide particles, montmorillonite particles, hydrotalcite particles, coal ash particles, diatomite particles, mica particle, attapulgite particles and zeolite particles after hydrophobic modification. The extinguishing agent disclosed by the invention is nontoxic, environmental pollution is less, and secondary loss caused by strong flowability of water can be avoided while playing the advantages of the water as the extinguishing agent and reducing the using amount.

The present invention discloses a preparation method for a composite oxide carrier. According to the method of the present invention, a composite oxide dry glue is prepared by the following steps, wherein the steps comprise: firstly preparing an aluminum hydroxide wet filter cake and an aqueous solution containing an IVB group metal complex; adding the wet filter cake to the complex solution, andstrongly stirring; carrying out filtering and drying to obtain the composite oxide dry glue. With the composite oxide dry glue prepared by the method, most of the IVB group metal oxide can be distributed on the surface of aluminum oxide so as to reduce the influence on the pore structure of the aluminum oxide, improve the assistant catalysis effect of the IVB group metal oxide, and improve the pore structure and the surface performance of the composite oxide carrier. In addition, with the present invention, the sulfurization performance of the catalyst adopting the composite oxide carrier as the carrier can be improved, and the loaded active metal is easy to reduce.

The invention discloses a method for preparing an aluminum oxide / carbon aerogel composite material. The method comprises the following steps: dissolving a water-soluble carbohydrate and a water-soluble high polymer in water in a closed container; adding an aluminum salt or aluminum hydroxide reacting at the temperature of 140-300 DEG C, drying, and calcining in an inert atmosphere of 300-1500 DEG C, thereby obtaining the aluminum oxide / carbon aerogel composite material. According to the method disclosed by the invention, the aluminum oxide / carbon aerogel composite material with low density and high porosity is prepared by adopting a one-pot process, the method disclosed by the invention has the advantages that the raw materials are readily available, the preparation process is simple, the cost is low and the like, and the prepared aluminum oxide / carbon aerogel composite material is light in weight and high in porosity and can be used for catalyst carriers, gas sensitive elements, solid electrolytic films and molten steel oxygen-measuring probe materials.

The invention discloses a heating-free non-alkali liquid accelerator for jetting concrete and a preparation method of the heating-free non-alkali liquid accelerator. The liquid accelerator is prepared from the following components in percentage by mass: 30%-55% of aluminum sulfate, 3%-10% of aluminium hydroxide, 10%-18% of hydrofluoric acid, 8%-25% of magnesium salt, 1%-8% of alkylol amine, 0.5%-4% of a stabilizer, and 10%-33% of water. The preparation method is characterized by comprising the following processing steps: putting aluminium hydroxide into a reaction kettle; adding water to the reaction kettle, and stirring aluminium hydroxide into paste; slowly adding hydrofluoric acid, and when the temperature reaches 50-55 DEG C, adding aluminum sulfate to stir in batches; after hydrofluoric acid is completely added, adding residual aluminum sulfate and supplementing residual water, so as to obtain reaction liquid; adding the magnesium salt to the reaction liquid, and then adding the alkylol amine and the stabilizer, so that the solution becomes evenly mixed liquid. The accelerator disclosed by the invention has strong adaptability with cement, low energy consumption and good performance, and does not need to be heated in the use procedure.

The invention relates to the field of composite materials, in particular to a continuously-directional glass fiber reinforcement unsaturated polyester sheet molding compound. The continuously-directional glass fiber reinforcement unsaturated polyester sheet molding compound comprises the following components in part by weight: 15 to 50 parts of unsaturated polyester resin, 5 to 12 parts of low astringent, 8 to 20 parts of chopped glass fibers of 12 to 26 millimeters, 1.5 to 8 parts of directional continuous glass fibers, 10 to 50 parts of calcium carbonate, 10 to 50 parts of aluminum hydroxide, 0.2 to 1 part of organic peroxide, 1 to 4 parts of styrene, 0.2 to 1 part of thickening agent, and 1 to 3 parts of mold discharging agent. The continuously-directional glass fiber reinforcement unsaturated polyester sheet molding compound has the advantages of reasonable formula design, good flame retardance, high strength, low manufacturing cost and stable quality.

The present invention provides a powdery composite precursor, which comprises a core of a lithium transition metal oxide, and an aluminum hydroxide-based precipitate layer coated on the surface of the core, and a process to prepare the composite precursor. The preparation process comprises the formation of a water based slurry by dispersing lithium transition metal oxide powder in water, and a precipitation reaction of an aluminum salt solution with a base solution where the lithium transition metal particles act as seed particles, whereby a mechanically stable precipitate layer of homogeneous thickness can be achieved. The composite precursor can be converted into aluminum-containing, e.g., aluminum-doped, lithium transition metal oxide suitable for a cathode active material of lithium rechargeable battery by heat treatment.

The invention provides a preparation method of a hollow flat plate structure type ceramic filter membrane element. The method comprises the following steps: (1) preparing a hollow structure type ceramic membrane supporting body by using an extrusion molding method, namely sintering aluminum hydroxide obtained by calcination at 600 DEG C as a main raw material to prepare the ceramic membrane supporting body; (2) preparing the ceramic filter membrane by using a plasma spray method. When the ceramic membrane supporting body is prepared, the selected and used raw material is calcined aluminum hydroxide, so that the sintering temperature of the ceramic membrane supporting body can be greatly reduced, and the sufficient strength of the supporting body can be guaranteed; when the ceramic filter membrane layer is prepared, the thickness of the filter membrane can be excellently controlled by using the plasma spray process, and the filter resistance is reduced; the membrane layer has the uniform pore size distribution and the high separation accuracy; the membrane layer is closely combined with the supporting body. The ceramic filter membrane is prepared by using plasma spraying without sintering, so that the process is simple, the production cost of the ceramic filter membrane can be effectively reduced, the production efficiency is improved, and the process can be widely applied to the fields of sewage treatment and filtration, solid-liquid chemical separation, and the like.