1694 results about "Metallic aluminum" patented technology

The invention discloses a method for harmless disposal and recycling of aluminum ash. The method comprises steps of raw material water immersion nitrogen and chlorine removal, calcination fluorine removal, alkali fusion sintering, sintering material dissolving-out and purifying impurity removal. Aluminum ash generated in metal aluminum smelting process is employed as a raw material, after metal aluminum is recycled through secondary processing, nitrides are removed through water immersion, fluorides are removed through calcinations, alkali fusion sintering is carried out, the sintering materials are dissolved out, impurities are removed through a sodium aluminate solution, the processed aluminum ash is employed as a raw material for producing sand-shaped aluminum oxide. Ammonia gas generated in the aluminum ash harmless disposal process can be employed as an ammonium production raw material, a chlorination liquid generated can be employed as a chlorate production raw material, and silicon fluoride gas generated in the calcination process is absorbed by an aqueous solution. The method is simple and practical, environmental protection benefits are high, the production efficiency is high, the device investment is low, and energy consumption is low. Harmless and recycling disposal of hazardous wastes can be achieved. The obtained product can be applied in practical production.

The invention discloses an Al/Al2O3 heat storage material and a preparation method thereof. Aluminum oxide serves as a base material; and a spherical metallic aluminum 'core' is enclosed by a layer of aluminum oxide 'enclosure'. In the process of heat storage, metallic aluminum can absorb heat to be changed from a solid state to a liquid state and the temperature of the metallic aluminum rises; at the same time, the external aluminum oxide layer also can absorb the heat, so that the temperature of the external aluminum oxide layer rises; and in the process of heat transfer, the liquid metallic aluminum releases both hidden heat and sensible heat and the aluminum oxide enclosure releases the sensible heat. The preparation process of the Al/Al2O3 heat storage material is obviously different from a conventional method, and comprises the following steps of: atomizing the liquid metallic aluminum (above 660 DEG C) into tiny particles with an atomizing device; and cooling the tiny liquid metallic aluminum particles in an oxidizing atmosphere and oxidizing the external aluminum oxide layer to form the Al/Al2O3 phase-change heat storage material taking the metallic aluminum as the 'core' and taking aluminum oxide as the 'enclosure', wherein the oxidizing atmosphere may adopt oxygen, water vapor, carbon dioxide or air diluted by an inert gas. The preparation method is simple and easy to realize large-scale production.

A slurry and slurry coating process for forming a diffusion aluminide coating on a substrate, including internal surfaces within the substrate. The process involves preparing a slurry of a powder containing a metallic aluminum alloy having a melting temperature higher than aluminum, an activator capable of forming a reactive halide vapor with the metallic aluminum, and a binder containing an organic polymer. The slurry is applied to surfaces of the substrate, which is then heated to burn off the binder, vaporize and react the activator with the metallic aluminum to form the halide vapor, react the halide vapor at the substrate surfaces to deposit aluminum on the surfaces, and diffuse the deposited aluminum into the surfaces to form a diffusion aluminide coating. The process can be tailored to selectively produce an inward or outward-type coating. The binder burns off to form an ash residue that can be readily removed.

The invention discloses a preparation method of wear-resistant high-chromium cast iron and belongs to the technical field of metal materials. According to the preparation method, common scrap steel, carburant, ferrochromium, ferromolybdenum, copper plates, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum are smelted in an electric furnace so as to form the wear-resistant high-chromium cast iron. The molten wear-resistant high-chromium cast iron comprises the following chemical components in percentage by mass: 3.0-3.5% of C, 18-25% of Cr, 0.3-0.5% of Mn, 0.3-0.5% of Si, 0.18-0.25% of N, 0.5-0.8% of Mo, 0.2-0.4% of B, 0.08-0.12% of Al, 0.5-1.0% of Cu, less than 0.05% of S, less than 0.05% P and the balance of Fe. Molten iron is treated with an inoculator when taken out from the electric furnace, and is treated with a suspending agent when poured, so as to obtain fine solidification structures. Therefore, the wear-resistant high-chromium cast iron has excellent properties.

The invention provides a resourceful treatment method for aluminum ash. Firstly, denitrification treatment, defluorination treatment and arsenic removal treatment are conducted so that nitrogen in the aluminum ash can be separated out in the form of ammonia gas to be recycled, harmful substances such as fluorine and arsenic are volatilized out, roasting is conducted, and aluminum ash clinker is obtained; and then metal impurity removing treatment is conducted, the roasted aluminum ash clinker is broken and finely ground and then is leached through diluted acid, metal impurities such as K2O, Na2O, CaO and MgO in the aluminum ash clinker are dissolved out, iron is removed through magnetic separation, and after pressure filtration separation, a finished aluminum oxide product is obtained through drying. According to the resourceful treatment method for the aluminum ash, aluminum oxide, metallic aluminum and the like in the aluminum ash can be recycled, byproducts such as ammonia water and iron are obtained, waste is turned into wealth, the social resource utilization rate is increased, meanwhile, components of fluorine and arsenic in the aluminum ash are removed, innocent treatment is done, and environment protection is facilitated.

The invention discloses a method for manufacturing a refractory material by innocent treatment of secondary aluminum ash, and belongs to the field of aluminum industry. The method comprises the following steps: further grinding the secondary aluminum ash until 80% of the secondary aluminum ash passes through a screen with the pore diameter of 74 microns; and calcining the secondary aluminum ash for 0.5-4 hours at the temperature of 1150-1550 DEG C in an oxidizing atmosphere with the oxygen content of 12%-18% to convert metal aluminum, aluminum nitride and aluminum carbide in the secondary aluminum ash into aluminum oxide and volatilize the fluoride salt and chloride salt in the secondary aluminum ash, thereby producing a calcined oxide; cooling the waste flue gas containing fluoride salt and chlorate produced in the calcining process for recovery, and denitrifying and discharging the flue gas. The calcined oxide is independently prepared or mixed with an additive, and the aluminum-magnesium refractory material is prepared after electric arc melting. The preparation method can be used for preparing the refractory material with high purity.

The invention relates to a method for treating the surface of seawater corrosion resistant metallic aluminum or aluminum alloy. The method comprises the following steps: 1) sand pellets are used to carry out gritting blasting treatment for the surfaces of aluminum and aluminium alloy through a spray gun so as to bring about the concave and convex surface topography in the micron order for aluminium and aluminium alloy; 2 the aluminium and aluminium alloy is cleaned after degreasing and is taken as the anode of an electrolytic bath, and nickel is taken as a cathode; the electrolyte is prepared and is added into the electrolytic bath, and a DC power supply is connected with the anode and the cathode so as to form nanometer holes on the aluminium or aluminium alloy surface; and 3 silicon fluoride is taken to carry out the surface finish of aluminum or aluminium alloy so as to reduce the surface free energy of aluminium or aluminium alloy. The method for adopting silicone fluoride to carry out the surface finish of aluminum or aluminium alloy comprises the following steps: heating up the aluminium or aluminium alloy processed in step 2 to 90 to 120 DEG C, keeping the temperature for 30 to 40 minutes, taking the aluminium or aluminum alloy out and cooling down the aluminium or aluminum alloy to a room temperature, and then carrying out surface finish through a soak method or a vapor plating method. The processed aluminium metal or aluminum alloy has good resistance to seawater corrosion.

The invention discloses a method for preparing nano aluminum nitride powder. The method comprises the following steps of: dissolving an aluminum source and a carbon source in a solvent respectively, mixing the dissolved aluminum source and carbon source and glycol solution of citric acid; warming the mixed solution to 125 to 135 DEG C, and keeping the temperature for 2 to 4 hours; continuously warming to 180 to 220 DEG C, and keeping the temperature for 2 to 4 hours to obtain a crisp black substance; calcining the crisp substance at the temperature of between 800 and 1,200 DEG C in vacuum or in the atmosphere of nitrogen; cooling the calcined substance and grinding; and performing a carbothermal reduction reaction at the temperature of between 1,350 and 1,600 DEG C to obtain the nano aluminum nitride powder. Raw materials adopted by the method have a wide source range and are readily available, a preparation process is simple and controllable, and aluminum ions are uniformly distributed in the carbon source by using the complexing action of the citric acid on metallic aluminum ions and the bonding and steric hindrance actions of glycol on the metallic aluminum ions so as to finally obtain the nano aluminum nitride powder with small particle sizes and uniform particle distribution.

The invention provides a high-boron high-speed steel roller material and a smelting process thereof. The smelting process of the high-boron high-speed steel roller material comprises the following steps: firstly, adopting Q235 waste steel, ferrotungsten, ferromolybdenum, ferrovanadium, high carbon ferro-chrome, metal copper, metal aluminum, calcium-silicon alloy, rare earth ferrosilicon magnesium alloy, ferrocolumbium, ferroboron, ferrosilicon, vanadium-nitrogen alloy, zirconium ferrosilicon and ferrotitanium as materials for smelting low-alloy high-speed molten steel in an electric furnace; then, adding the ferrovanadium and part of ferroboron to carry out alloying in a discharging process; finally, adding part of ferroboron and composite modificator in a casting ladle, adding the vanadium-nitrogen alloy, the zirconium ferrosilicon, the ferrosilicon and part of ferroboron in the casting process. The obtained casting piece has a little alloy elements, excellent abrasive resistance and good thermal fatigue resistance. When the high-boron high-speed steel roller material is used as a roller, the service life is prolonged by more than six times relative to a high nickel-chrome infinite cast-iron roller, and prolonged by 20% relative to a high-vanadium high-speed steel roller. Moreover, the roller is safe to use and reliable.

The invention relates to effect pigments having an aluminum core or aluminum alloy core and an aluminum oxide-containing or aluminum oxide/hydroxide-containing layer enveloping said aluminum core or aluminum alloy core, obtained by chemical wet-process oxidation of lamellar aluminum pigments or aluminum alloy pigments, the content of metallic aluminum in the aluminum core or aluminum alloy core being not more than 90% by weight, based on the total weight of the pigment, wherein the oxidized aluminum pigments or aluminum alloy pigments exhibit at least one highly refractive metal chalcogenide layer having a refractive index of >1.95, and a mixed layer is formed between the highly refractive metal chalcogenide layer and the enveloping aluminum oxide-containing or aluminum oxide/hydroxide-containing layer. The invention further relates to a process for the production of such effect pigments and to the use thereof.

The invention relates to a method for preparing premelted refining slag by using converter slag and aluminum slag, which comprises the following steps: selecting raw materials according to the requirement that the content of metallic aluminum in the aluminum slag is greater than or equal to 20% in mass percent; proportioning the raw materials under the condition that the mass ratio of the converter slag to the aluminum slag is (2.0-2.5):1; controlling the smelting temperature of the premelted refining slag at 1500-1600 DEG C, adding the aluminum slag in three batches after the converter slag is completely molten down, and standing for 20-30min after the last batch of aluminum slag is added and stirred uniformly, thereby realizing the purpose of separating slag from iron in a molten pool; and cooling the prepared premelted refining slag to the normal temperature, crushing the prepared premelted refining slag to the particles of which the particle size range is within 5-30mm, and then, packaging the particles. On the basis of ensuring the refining effect, the method of the invention completely uses industrial slag materials as raw materials, thereby protecting the natural mineral resources, widening the utilization ways of the converter slag and the aluminum slag as resources, and partially realizing the cyclic utilization of the converter slag in iron and steel production processes.

The invention discloses an aluminum ash recovering and reutilizing method. The method includes the steps of S1, rolling and grinding aluminum ash, separating out iron impurities through a magnetic separation method, and separating out metal aluminum through a screening method to obtain secondary aluminum ash; S2, conducting washing operation on the secondary aluminum ash, and decomposing aluminumnitride and salt in the secondary aluminum ash; S3, adding a certain ratio of kaolin, bentonite and talc to washed aluminum-oxide-containing filter residues to be mixed to obtain wet-milled slurry, and further adding a stabilizer (ammonium polyacrylate) and surfactants (carboxymethylcellulose and thermal silica sol) to prepare slurry; S4, impregnating the slurry obtained in the step S3 through organic foam, and conducting multiple times of slurry hanging and drying to obtain a biscuit; S5, conducting glue discharging and firing on the biscuit obtained in the step S4 to obtain foam ceramic. Thehigh-valued utilization rate of the aluminum ash is effectively increased, and meanwhile the environmental pollution is effectively reduced.

The invention discloses an unburned magnesium-aluminum spinel brick, which comprises the following components by mass: 50-80% of corundum, 5-30% of magnesia-alumina spinels, 2-5% of magnesia powder, 3-10% of alumina powder, and the balance at least one of elemental silicon powder, metallic aluminum powder and boron carbide powder. All the components of the unburned magnesium-aluminum spinel brick are combined through an additionally added binder. The unburned magnesium-aluminum spinel brick causes no pollution to the environment, has excellent molten steel erosion resistance, slag penetration resistance and scouring resistance, and has a long service life additionally.

The invention discloses a high-adhesion benzene-free environmentally-friendly universal jet ink and a preparation method thereof, the jet ink is prepared by the following raw materials and solvents by weight percent: 5-10 of modified chlorinated polypropylene resin; 1-5 of complex resin; 70-89 of butanone; 2-6 of dye; 0.5-1.5 of conductive auxiliary agent; 1-3 of plasticizing agent; 0.5-1.5 of liquid paraffin; and 1-3 of other auxiliary agents. During the preparation, the modified chlorinated polypropylene resin and the complex resin are dissolved in 50-70% of butanone based on the total quantity, the rest butanone is used for the dissolution of other ingredients, the ink jet can be prepared by mixing both, and the resultant ink jet has excellent adhesion for the surface of polyethylene, polypropylene, metallic aluminum material, glass, PET, PVC and PVA materials; since only butanone is used as the solvent, the environmental friendliness of the jet ink is greatly enhanced; and the jet ink with stable system, clear print and fast drying can take the place of a large number of commercial jet ink products at present.

The invention relates to a repairing mass for repairing in the converter production process of steel making and vanadium extracting of steel enterprises, in particular to a repairing mass used for a converter lining made of magnesia carbon bricks and a preparation method thereof, and provides a repairing mass having the advantages of short sintering time and long service life for meeting the requirement of production. The repairing mass per 100 weight parts comprises the following raw materials in parts by weight: 48-60 parts of fused magnesia, 22-28 parts of magnesite clinker, 10-16 parts ofmodified asphalt, 1-5 parts of metallic aluminum powder, 1-4 parts of ferric oxide powder and 2-10 parts of adhesive. The preparation method of the repairing mass is simple and convenient, i.e. all the raw materials are mixed. In the fettling production process of the vanadium extracting converter, when a local breakage appears on the converter lining, the repairing mass is coated on the part to be repaired; the repairing mass is sintered by utilizing the wall temperature of the converter, and production by blending with iron can be carried out after sintering; and under the conditions of lowsmelting temperature (1,360-1,400 DEG C) of the vanadium extracting converter and shorter smelting period (5-10 minutes), the repairing mass still can be quickly sintered with a working lining to form an organic combination with higher strength so as to prolong the service life of the repairing mass.

The invention discloses a recycling method of a positive electrode piece of a lithium ion battery, aiming at solving the problem of recycling of a nickel cobalt lithium manganite (nickel cobalt lithium aluminate) positive electrode piece and a lithium cobaltate positive electrode piece generated in a production process of the lithium ion battery. According to the technical scheme disclosed by the invention, the recycling method comprises the following steps: 1, crushing the electrode pieces by classes; 2, immersing with an organic solvent; 3, carrying out stirring treatment; 4, filtering with a sieve net; 5, carrying out centrifugal separation; 6, immersing with an alkaline solution; 7, carrying out the centrifugal separation again; 8, drying and removing iron; 9, carrying out ICP (Inductively Coupled Plasma) analysis; and 10, calcining the materials. The recycling method disclosed by the invention can be used for effectively recycling waste materials of the positive electrode pieces of the waste lithium ion batteries, so that the cost is saved; and by immersing with the alkaline solution and carrying out a plurality of times of separation and washing, impurities, such as metal aluminum, in powder grains can be effectively removed. With the adoption of the recycling method, a positive electrode material and an aluminum foil can be completely separated, and the positive electrode material keeps a relatively good structure and electrochemical properties; and the synthesis of a precursor is not needed and the adding amount of a lithium salt is relatively less.

The invention discloses stripping solution for a sintered neodymium-iron-boron surface aluminum coating. The stripping solution comprises sodium hydroxide serving as a corroding agent, sodium carbonate serving as an auxiliary salt, a complexing agent capable of promoting the dissolution of metallic aluminum, a corrosion inhibitor for retarding the corrosion of a matrix, and a surfactant for uniformly dissolving an aluminum coating. Compared with the prior art, the stripping solution for the sintered neodymium-iron-boron surface aluminum coating has the advantages of quickly and uniformly stripping the sintered neodymium-iron-boron surface aluminum coating and simultaneously reducing the damage to the sintered neodymium-iron-boron matrix due to the reasonable design of components and content of the stripping solution; and besides, the stripping solution has the characteristics of low production cost, high stability and long service cycle.

A metallic aluminum bionic super-hydrophobic surface preparation method includes: sequentially washing aluminum sheets through acetone, absolute ethyl alcohol and deionized water in ultrasonic mode, then drying the aluminum for spare; soaking the clean aluminum sheets in HCl or NaO with centain concentration to remove a surface oxidation layer, and washing the aluminum sheets through the deionized water repeatedly; suspending the aluminum sheets performed with acid or alkali corrosion treatment perpendicularly in mixed solution of cerous nitrate and hexamine for ageing at room temperature fora night, raising the temperature to a certain value for reaction, and leading a cerium oxide film to grow on the surfaces of the aluminum sheets performed with chemical corrosion in situ. Nanoscale leaf-like structures are evenly distributed on the surface of the film, some leaves get together to form micron-order mastoids, each mastoid is formed by a large number of nanoscale leaves in staggeredgathering mode, and a metallic aluminum bionic super-hydrophobic surface is of a patellate-like nanometer-micron composite rough porous structure. Through modification of stearic acid, a contact angle between the surface and water reaches 150-165 degrees, a rolling angle is less than 10 degrees, and the metallic aluminum bionic super-hydrophobic surface has good super hydrophobic and self-cleaning performance.

The invention discloses a preparation method of lithium ion battery anode material. The method comprises the following steps: A. mixing Li2CO3, Al2(SO4)3 and Co3O4 in certain mol ratio; B. adding solvent in the obtained mixture for wet-grinding; C. removing solvent and drying; D. porphyrizing; E. roasting at high temperature; and F. cooling to obtain lithium, aluminum and cobalt oxide anode material. In the invention, metallic aluminum ions are doped in the preparation process of lithium ion battery anode material to exert synergistic effect, so as to prepare excellent performance lithium cobaltate doped with aluminum ions. The anode using the material can maintain stable structure after circulating for a long time, thus enhancing capacity retention rate.

The invention discloses a preparation method for aluminum-scandium alloy target materials. The preparation method comprises the following specific steps of selecting metallic aluminum powder with thepurity of 99.5% or above and the particle size of 10-165 [mu]m, and metallic scandium powder with the purity of 99.5% or above and the particle size of 10-240 [mu]m, and uniformly mixing the metallicaluminum powder and the metallic scandium powder according to the mass ratio that the metallic aluminum powder accounts for 50%-98% and the metallic scandium powder accounts for 2%-50% by mass; putting the mixed powder into a mould, and pre-pressing the mould at room temperature with the pre-pressing force of 20-35 MPa; putting the pre-pressed mould into a vacuum hot press which is vacuumized to 6.7x10<2>-6.7x10<3> Pa, entering a sintering stage, and then cooling the mould to the room temperature; after cooling the mould to the room temperature, releasing vacuum and removing the mould pressureso that the aluminum-scandium alloy target materials are obtained; the relative density of the aluminum-scandium alloy target materials is high through the dual effects of pressure application and sintering; and the composition proportion can be regulated within a larger range.

A method and composition for producing hydrogen by water split reaction, at near neutral pH conditions and without requiring preheating of the reactant materials. Metallic aluminum in particulate form is combined with a metal oxide initiator that raises the temperature of the reactant material upon exposure to water, to a level which initiates reaction of water with the aluminum to generate hydrogen, and a catalyst that creates progressive pitting of the metallic aluminum to prevent passivation. The metal oxide initiator may be an alkaline metal earth oxide, with calcium oxide being preferred. The catalyst may be a water soluble inorganic salt having an aggressive anion, such as the halides, sulfites, sulfates and nitrates of alkaline metals and alkaline earth metals, with sodium chloride being preferred. The metallic aluminum may be in the form of a milled particulate, and may be combined with the salt catalyst in a mechanical alloy. The reaction initiates upon adding normal tap water at ambient temperature, and is capable of generating hydrogen at low pressures or at elevated pressures of 7,000 psig or more. The reaction products can be recycled or disposed of safely without presenting hazards to the environment.

The present invention relates to one kind of composite magnesia-alumina spinel/Sialon ceramic material and its preparation process. The technological scheme is that the materials including alumina ash 25-95 wt%, fine magnesia powder 0.1-2 wt%, fine bauxite chamotte 0.5-55 wt%, fine silicon powder 0-30 wt%, fine aluminum powder 0-10 wt% and fine SiO2 powder 0-50 wt%, are prepared into the composite magnesia-alumina spinel/Sialon ceramic material through mixing, forming into biscuit, sintering in nitrogen atmosphere first at 1000-1100 deg.c for 0.5-5 hr, then at 1300-1350 deg.c reached in the rate of 2-5 deg.c/min for 1-6 hr and finally at 1360-1500 deg.c reached in the rate of 2-5 deg.c/min for 2-10 hr, and naturally cooling to room temperature in nitrogen atmosphere. The present invention has waste alumina ash as main material, environment friendship and low production cost.