112 results about "Aluminium industry" patented technology

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 foam glass manufacturing method, in particular to a method for preparing high-strength foam glass by utilizing red mud and waste glass. The invention aims at providing a preparation method for high-strength red mud foam glass which utilizes solid wastes and reduces the foam glass production cost. According to the technical scheme, the method for preparing high-strength foam glass by utilizing red mud and waste glass comprises the steps: firstly mixing red mud, waste glass and foam agent, carrying out ball milling to obtain powder batch mixture, and then conducting foaming and annealing treatment to obtain high-strength red mud foam glass product, wherein the red mud is polluting waste slag exhausted when the aluminum oxide is extracted in aluminum industry. The method has the beneficial effects of massively applying solid wastes red mud and waste glass, being environment-friendly and energy-saving, and changing wastes into valuables, thereby having good social benefits and economic benefits.

The invention relates to foam glass ceramic manufacturing method, in particular to a method for preparing foam glass ceramics by utilizing red mud and waste glass. The invention aims at providing a preparation method for preparing environment-friendly and energy-saving foam glass ceramics. According to the technical scheme, the method for preparing foam glass ceramics by utilizing red mud and waste glass comprises the steps: firstly mixing red mud and waste glass, carrying out ball milling to obtain powder batch mixture, and then conducting foaming and annealing treatment to obtain foam glass ceramics, wherein the red mud is polluting waste slag exhausted when the aluminum oxide is extracted in aluminum industry. The method has the beneficial effects of being simple in preparation technique and low in sintering temperature, lowering the production cost of foam glass ceramics, and obtaining higher economic benefits while solving the environment-friendly problem.

The invention discloses a ceramic catalyst taking red mud waste residues as a carrier as well as a preparation method and an application thereof. According to the catalyst, ceramic spherical particlesprepared from polluting red mud waste residues discharged when aluminum oxide is extracted in the aluminum production industry, aluminum source powder and a forming agent solution are used as carriers, molybdenum oxide is used as a catalytic active component, and zirconium oxide is used as a cocatalyst. The preparation method comprises the following steps: preparing a ceramic spherical particle carrier from red mud waste residues, aluminum source powder and a forming agent solution through crushing, burdening, granulating, forming, calcining and other processes; dipping the ceramic sphericalparticle carrier in an active component and co-catalytic ion precursor composite solution; drying the carrier, and roasting the carrier to obtain the ceramic-based reforming hydrogen production catalyst. The reforming hydrogen production catalyst not only can realize resource utilization of industrial waste residue red mud, but also is high in H2 selectivity of reforming formaldehyde to produce hydrogen at a low temperature, is simple in preparation process, and has a wide market application prospect.

The invention relates to a repairing device for an anode steel claw which is a consumptive part in the field of electrolytic aluminium, belonging to the electrolytic aluminium industry. The invention has the technical scheme that in a device for repairing an electrolytic aluminium anode steel claw by total cross-section fusion welding, a slag pool is formed by metal pallets and a cavity formed by moulds and a residual steel claw leg; the metal pallets are respectively arranged at the two opposite sides of the residual steel claw leg; the moulds are respectively positioned on the metal pallets and are closely jointed with the residual steel claw leg; the upper part and the lower part of each mould are respectively connected with a water outlet pipe and a water inlet pipe, and the interiors of the moulds are cavities; fluxing agent is arranged in the slag pool; an electrode is inserted into the slag pool, and a certain distance is maintained between the electrode and the residual steel claw leg; and the electrode and the residual steel claw leg are connected with a transformer by leads. The steel claw leg repaired by the device is high in strength and utilization rate; and meanwhile, the energy is saved, the consumption is reduced, and the problems caused by artificial repairing can be solved.

The invention relates to a fused salt electrolytic aluminum inert anode and a preparation method and application thereof, and belongs to the technical field of ceramic-metal composite materials. The inert anode is composed of an oxide ceramic primary phase and a metal secondary phase. The oxide ceramic primary phase is composed of a nano and quasi-nanoparticle level NiFe2O4 spinel principal component and a ZrO2, V2O5, CeO2 ad MgO modified adding component. The metal secondary phase is formed by selecting five to six of micron order Ni, Cu, Co, Zn, Cr, Ag, Ti, Al, Sc, Zr, No, V, Mn, Y and La. The inert anode is compounded through spinel, nano and quasi nano oxide is obtained by milling through a high energy ball, and the inert anode can be prepared through the steps of common ball milling, compression molding and metal or protective atmosphere sintering, machining and the like of oxide and metal powder. The fused salt electrolytic aluminum inert anode has the advantages of being good in electrical conductivity, high in high-temperature salt corrosion resistance and antioxidation, good in thermal shock resistance and capable of not polluting aluminum electrolysis products. The fused salt electrolytic aluminum inert anode is used in fused salt electrolytic aluminum and is used as a substitution of a carbon anode, and the problems of high consumption and high pollution in the aluminum industry at present can be solved.

The invention provides a metal ceramic material resistant to molten aluminum corrosion, and a preparation method and an application thereof, and relates to the technical field of metal material corrosion and protection. The chemical composition of the metal ceramic material provided by the invention is Ti(C0.3,N0.7)-Al0.25FeNiCoCr, raw materials for preparing the metal ceramic material comprise Ti(C0.3,N0.7) and an Al0.25FeNiCoCr high-entropy alloy; the mass percentage of the Al0.25FeNiCoCr high-entropy alloy in the metal ceramic material is 8-30%; the microscopic Vickers hardness of the metalceramic material ranges from 779.4 HV[0.2] to 1237.1 HV[0.2]. The metal ceramic material provided by the invention has excellent molten aluminum corrosion resistance and good hardness and toughness,and can be applied to the aluminum industry. The preparation method of the metal ceramic material is simple in process and beneficial to large-scale production.

The invention discloses a method for producing cryolite by wast liquid of vacuum residues in the aluminium industry. The waste liquid is alkali bath solution which is generated by utilizing sodium hydroxide to dissolve aluminium and contains sodium metaaluminate; a fluorine-containing acid compound and sodium carbonate are added in the waste liquid to produce the cryolite. According to the methoddisclosed by the invention, aluminium ions in the waste liquid can be sufficiently recycled and converted into the industrial cryolite, wastes are changed into treasure and high-value resource utilization of waste aluminium is implemented; sodion in the waste liquid is sufficiently utilized so as to greatly reduce cost of sodium hydroxide; aluminium and alkali in the waste liquid are sufficientlyrecycled, and zero discharge of wastewater and waste residues in a die repairing workshop is implemented.

The invention belongs to the field of carbon anode new materials for the electrolytic aluminium industry, and particularly relates to a preparation method of a graphene composite protective layer fora pre-baked carbon anode. The preparation method includes the steps of (1), adding graphene oxide in distilled water, stirring uniformly ultrasonically, adding phenolic resin with heating and stirring, performing redox reaction to obtain aqueous dispersion solution of graphene phenolic resin; (2) weighing a certain quantity of aqueous dispersion solution of graphene phenolic resin, sequentially adding graphite powder emulsion and nanometer aluminium oxide into the aqueous dispersion solution of graphene phenolic resin, and performing ultrasonic dispersion to obtain a graphene composite coating; (3), taking the graphene composite coating obtained the step (2), adding distilled water to dilute the graphene composite coating, covering the surface of the pre-baked carbon anode with the dilutedgraphene composite coating, and then drying naturally to obtain the graphene composite protective layer. The protective layer can effectively isolate oxidation action of air and carbon dioxide to carbon blocks; the carbon yield ratio in the air reactivity test is greater than 95%, and particularly the carbon yield ratio is greater than 96% after the CO2 reactivity test.

The invention belongs to the technical field of mineral process engineering, and specifically discloses a sulphur-containing bauxite gravity concentration and desulphurization method. The sulphur-containing bauxite gravity concentration and desulphurization method comprises the following steps of: modulating water for sulphur-containing bauxite mineral powder and/or a liquid caustic soda solutionand/or seeded precipitation spent liquor into ore pulp, adopting gravity concentration equipment to perform gravity concentration on the sulphur-containing bauxite ore pulp, and performing gravity concentration to separate and remove sulphur-containing minerals from the sulphur-containing bauxite ore pulp, wherein gravity-concentration operation is any one or two or more of roughing operation, selection operation and scavenging operation. The sulphur-containing bauxite gravity concentration and desulphurization method adopts a low-cost gravity concentration method to treat sulphur-containing bauxite, and a separation liquid medium needed in the gravity concentration process is water, liquid caustic soda solution and the seeded precipitation spent liquor, which is in common use with a solution in an aluminium oxide production process, and therefore, the generated bauxite concentrate does not need high-cost filtration operation, only needs simple concentration, and can be directly fed into an aluminium oxide production process, the production cost of producing bauxite concentrate and an aluminium oxide product is reduced, and the technical indexes of the aluminium industry are improved.

The invention provides a method for controlling phosphorus and heavy metal release in pig manure. In the method, a novel modified red mud fixative is prepared by roasting basic material waste slag red mud generated in the production process of the aluminum industry; and the red mud fixative is blended with a proper amount of the pig manure so as to effectively control the dissolution release of phosphorus and heavy metals in the pig manure and reduce the serious environmental pollution caused by the dissolution of the phosphorus and the heavy metal in the pig manure through the fixation of the fixative to the phosphorus and the heavy metals in the pig manure. The method realizes the recycling of waste resources, and has wide application prospect for area source pollution control.

The invention discloses a bipolar radio-frequency admittance material level switch, comprising a main measuring staff 1, an electronic unit 2 and an auxiliary measuring staff 3 arranged on the main measuring staff 1, wherein, the auxiliary measuring staff 1 and the main measuring staff 3 are connected with the electronic unit 2. The bipolar radio-frequency admittance material level switch has the characteristics of HF corrosion resistance, high temperature resistance, scouring resistance, electromagnetic interference resistance, static electricity prevention, hanging prevention, anti-strong vibration effect, etc. The invention has stable and reliable operation, low failure rate and long service life, thereby greatly reducing expenses for repairing and maintaining spare parts and reducing cost for manufacturing electrolytic aluminium. The invention saves expenses of spare parts over 500,000 Yuan annually according to a calculation that consumption of material level switches are reduced by 100 per year, thereby providing a considerable economic benefit. The product not only can be applied to material measurement in the aluminium industry, but also can be popularized and applied in the petrochemical industry, the metallurgy industry, the electrical power industry, the energy industry, the cement industry and other industries.

A high-electric-conductive anode assembly effectively solving inward-bending deformation belongs to the technical field of anode electric-conductive devices in electrolytic aluminium industry. The invention particularly relates to a high-effective anode assembly effectively solving the inward-bending deformation, which not only solves a problem of inward bending of a steel claw, but also reduces welding quantity, is excellent in replaceability and is significantly higher than a cast steel claw in electric conductivity. The anode assembly includes a supporting cross beam which is characterized by including a first U-shaped steel board. An aluminum boss is disposed internally in the middle of the first U-shaped steel board through a bolt assembly. The upper end of the aluminum boss is stretched out from the upper part of the supporting cross beam. Two movable cross beams are respectively disposed in both the two ends of the first U-shaped steel board. Each movable cross beam includes a second U-shaped steel board which is connected to each end of the first U-shaped steel board in a sleeving manner. The second U-shaped steel boards are connected to the first U-shaped steel board through the bolt assembly in a long bar hole in the first U-shaped steel board. Two steel claw heads are respectively disposed on two ends of the bottom of the first U-shaped steel board.

The invention provides a preparation method of an aluminum-silicon-titanium alloy. The preparation method comprises the following steps that (A) aluminum silicon overhaul slags are crushed to obtain crushed materials, in the crushed materials, the aluminum content is 15 wt% to 20 wt%, the silicon content is 10-15 wt%, the iron content is less than or equal to 5 wt%, and the titanium content is 1-3wt%; and (B) slags containing titanium, silicon-titanium alumina and the crushed materials are mixed into an electrolytic cell for electrolysis to obtain the aluminum-silicon-titanium alloy, and theelectrolyte superheat degree of electrolysis is 12-16 DEG C. According to the preparation method, the aluminum-silicon-titanium alloy is prepared by using an electrolytic method, the aluminum-silicon-titanium alloy with more stable chemical property and higher purity is obtained, the aluminum-silicon-titanium alloy is prepared by using the overhaul slag solid wastes harmful to the environment andproduced by electrolytic aluminum industry, the environmental problem of solid waste storage is solved, the solid wastes can be reused, and direct economic value is brought.

The invention belongs to the technical field of environment-friendly materials and non-ferrous metal smelting, and particularly relates to a method for treating aluminum ash in aluminum industrial production. According to the method, a wet chemical ball milling process is mainly used for strengthening an aluminum ash reaction, and a catalyst, an accelerant and the like are added to strengthen thehydrolysis reaction effect of the aluminum ash, so that the purpose of removing nitrogen in the aluminum ash is achieved, and the aluminum ash is changed into an available harmless powder material after harmless treatment. According to the harmless aluminum ash treatment method provided by the invention, the aluminum ash is treated by adopting a wet method, so that the risks of flammability, explosiveness and the like of the aluminum ash are avoided, and the operation safety coefficient is improved; mechanical stirring is replaced with a wet ball milling mode, and in the stirring process, thehydrolysis effect of the aluminum ash is enhanced by utilizing the mechanical force of ball milling; and according to the method, the technological process is shortened, the aluminum ash can be further refined while ball-milling aluminum separation is conducted, the reaction is more sufficient, the denitrification effect of the aluminum ash is improved, the reaction time is shortened, and energy can be greatly saved in industrial production.

The invention discloses a composite iron-removing technology of secondary aluminum, which is mainly applied to removing iron from aluminum-silicon alloy. At least one of borax and manganese chloride is added in silicon alloy melt of secondary aluminum in the iron-removing technology. The iron removal rate can reach up to 49%; and meanwhile, an alloy of aluminum, iron and manganese can be further generated, so that the energy resource can be greatly saved, the production cost of aluminum alloy products is reduced, and the technology meets the requirement of sustainable development in aluminum industry.

The invention relates to the technical field of recycling of aluminum industry waste resource aluminum ash, and discloses a safe harmless aluminum ash treatment method. According to the safe harmlessaluminum ash treatment method, aluminum ash is subjected to staged treatment, namely, primary deamination treatment, pulping and secondary deamination, and catalytic deamination, aluminum nitride in aluminum ash is decomposed by stages, ammonia gas is generated, release of ammonia gas is smooth, concentration of ammonia gas is controlled out of the explosion limit range, and the production safetycoefficient of an aluminum ash treatment system is improved; and the water content of ammonia gas generated during the pulping and secondary deamination, and catalytic deamination processes is high, concentration of ammonia gas is low, vapor containing ammonia gas is generated, vapor containing ammonia gas is collected and sent to the primary deamination treatment process and is adopted as a reaction raw material of aluminum ash primary deamination, high-concentration ammonia gas is obtained through treatment, the problem that concentration of ammonia gas generated through aluminum ash deamination is too low is effectively solved, and evaporation concentration cost of ammonia gas is eliminated.