140 results about "Cryolite" patented technology

The invention provides equipment for extracting lithium from electrolytic aluminum slag and a process for extracting lithium and co-producing cryolite, and relates to the technical field of solid waste treatment, the equipment comprises a bottom plate, a heating tank, an extracting tank, a filtering tank, a top cover, a driving mechanism, a switching mechanism and a mixing mechanism; the heating tank is installed on the upper surface of the bottom plate, the extraction tank is installed inside the heating tank, the filtering tank is installed inside the extraction tank, the top cover is installed on the upper surface of the filtering tank in a sealed mode, and a liquid inlet pipe and a feeding pipe are installed inside the top cover. According to the scheme, the conical mixing barrel and the linkage overturning type material mixing plate are adopted, the material mixing plate can overturn caustic soda flakes into the electrolytic aluminum slag, then the caustic soda flakes and the electrolytic aluminum slag are mixed through the material mixing rod, it can be guaranteed that the caustic soda flakes can be evenly mixed with the electrolytic aluminum slag through the design, and it is guaranteed that the caustic soda flakes can be well attached to the surface of the electrolytic aluminum slag; and rapid overheating can be avoided when the subsequent caustic soda flakes are contacted with water, so that the filter tank works more stably and safely.

The invention relates to the field of architectural ceramics, and discloses a sapphire effect dry particle, a ceramic tile with a sapphire imitation effect and a preparation method of the ceramic tile. The sapphire effect dry granules comprise blue dry granules and transparent dry granules, wherein the blue dry granules are prepared from the following raw materials: 1.5 to 3.5 parts of superfine tin dioxide, 15 to 19.5 parts of cobalt oxide, 4.5 to 7.5 parts of titanium oxide, 8 to 14 parts of zinc oxide, 32 to 43 parts of calcined aluminum oxide, 8 to 13 parts of quartz, 10 to 16 parts of potassium feldspar and 2.5 to 4.5 parts of boric acid; the transparent dry particles comprise the following raw materials in parts by weight: 8-15 parts of zinc oxide, 5-10 parts of aluminum oxide, 24-28 parts of quartz, 1-2.5 parts of nano silicon nitride and 7-11 parts of cryolite. By mixing the two dry granules, the frit dry granules which have a three-dimensional effect and an ice crack texture and imitate the texture of sapphire crystals can be prepared. The ceramic tile with the sapphire-like effect can be prepared by adopting the dry particles with the sapphire effect.

The invention relates to a stainless steel flux-cored wire for welding 5% Ni steel, the stainless steel flux-cored wire is prepared by coating powder with a stainless steel strip, the mass of the powder accounts for 22%-28% of the total mass of the flux-cored wire, and a flux core comprises the following components in percentage by weight: 15.0%-30.0% of chromium metal powder, 9.0%-20.0% of nickel metal powder, 3.0%-10.0% of molybdenum metal powder, 2.0%-8.0% of electrolytic manganese metal, 30.0%-35.0% of rutile, 0.5%-3.0% of quartz, 2.0%-8.0% of albite, 0.5%-3.0% of potassium feldspar, 0.5%-5.0% of cryolite and 0.2%-0.5% of self-made raw materials. And the balance of reduced iron powder and inevitable impurities. The external steel strip is an austenitic stainless steel strip 304L, and the carbon content of the external steel strip is smaller than or equal to 0.025%. The flux-cored wire is mainly matched with a steel plate with the Ni content being about 5% for welding, the low-temperature impact of a welded joint of the flux-cored wire at the temperature of-140 DEG C can reach 40 J, the tensile strength is larger than 600 MPa, and the flux-cored wire is good in crack resistance and excellent in comprehensive performance.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention provides a method for synergistically preparing calcium fluoride and a molecular sieve based on multi-element industrial waste, and belongs to the technical field of industrial waste recycling. The method comprises the following steps: respectively taking an electrolytic aluminum industry byproduct fluorine-containing waste electrolyte cryolite and lithium slag after lithium extraction of lithium ore as raw materials, performing acid leaching on the electrolyte cryolite, adding a calcium compound, separating to obtain calcium fluoride solid and a mixed solution containing aluminum chloride and sodium chloride, and adding an alkaline solution into the mixed solution to obtain an aluminum hydroxide product. And carrying out alkaline leaching on the lithium slag to obtain a mixed solution containing sodium silicate and sodium metaaluminate, and proportionally synthesizing the mixed solution with the obtained aluminum hydroxide and sodium hydroxide solution to obtain the 4A zeolite molecular sieve product. The calcium fluoride and the zeolite molecular sieve are cooperatively prepared by adopting multi-element industrial waste, and the problems that electrolyte cryolite cannot be completely applied to the aluminum electrolysis process, the lithium slag treatment cost is high and the like in the prior art are solved.

The invention discloses a method for comprehensively recycling electrolytic aluminum carbon residues, and relates to the technical field of comprehensive recycling of waste materials. The method for comprehensively recycling the electrolytic aluminum carbon residues comprises the following steps of: breaking the carbon residues into 0.1-1cm particles by a hammer, carrying out wet ball milling under the condition of adding a flotation agent, and separating carbon powder on the upper layer and gray regenerated cryolite on the bottom layer of slurry through flotation equipment, wherein the fineness is 40-100 meshes, and the carbon content is less than 1%; the preparation method comprises the following steps: adding water into cryolite to prepare slurry, adding calcium oxide or calcium hydroxide, heating, stirring and reacting for 1-3 hours, and carrying out filter pressing to obtain filtrate and filter residues which are calcium fluoride and a sodium metaaluminate solution; the purity of the calcium fluoride powder is greater than 85%; and introducing hydrochloric acid into the filtrate, stirring and adjusting the pH to 7-9 to obtain aluminum hydroxide slurry, filtering and washing to obtain aluminum hydroxide, and drying to obtain the aluminum hydroxide with the purity of more than 95%.

The invention provides a flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

The invention discloses an efficient preparation process of cryolite, and relates to the field of cryolite preparation. The process comprises the following steps: S1, taking carbon residues ground by a ball mill, and putting the carbon residues into a dissolution reaction kettle filled with alkali liquor for reaction; s2, after the reaction in the reaction kettle is finished, filter pressing is performed through a plate-and-frame filter press, and coarse carbon powder and filtrate are obtained; s3, pumping the filtrate into a carbon reaction kettle, and introducing carbon dioxide for reaction; s4, after the reaction in the carbon component reaction kettle is finished, carrying out filter pressing through a plate-and-frame filter press; and S5, drying the solid material obtained by filter pressing in a calcining furnace to obtain cryolite. In the process, the industrial waste carbon residue is used as a raw material, and participates in a series of reactions to prepare the cryolite after being subjected to ball-milling refining treatment, so that resource recycling of the waste is realized. The method not only effectively reduces the pollution of the carbon residue to the environment, reduces the accumulation amount of solid wastes, but also reduces the exploitation of natural cryolite minerals, and protects non-renewable resources.

The invention relates to the technical field of preparation of intermediate alloys for aerospace-grade titanium alloys, and discloses a vanadium-aluminum intermediate alloy for an aerospace-grade titanium alloy and a preparation method of the vanadium-aluminum intermediate alloy. According to preparation of the alloy, high-purity aluminum particles, vanadium pentoxide, calcium oxide, cryolite and aluminum foil serve as raw materials, a primary alloy is prepared through a vacuum aluminothermy method based on an aluminum foil bag-shaped powder bag type material, then the primary alloy is subjected to finishing treatment to obtain alloy particles, then the alloy particles are sequentially subjected to alkali washing, filtering, vacuum heat treatment and other links, and the aluminum foil bag type aluminum alloy is obtained. And finally, the AlV65 alloy which is higher in purity, better in component uniformity and purer in microstructure is prepared. The method can emphatically solve the problems that the existing vanadium-aluminum alloy is high in gas phase impurity content, heavy in component segregation and more in microscopic inclusion, and is of great significance to construction of a more tough aerospace industry chain and promotion of high-quality development of the industry.

The invention relates to the field of iron and steel smelting, and provides a preparation and application method of aluminum-barium-Ca2C refining slag, the method comprises the following steps: S1, obtaining low-nitrogen aluminum ash, cryolite powder, a binder, metal aluminum, metal barium and Ca2C, and uniformly mixing the low-nitrogen aluminum ash, the cryolite powder and the binder to obtain a mixture; s2, the mixture serves as an outer layer material, metal aluminum, metal barium and Ca2C serve as inner layer materials, and refining slag balls are obtained through dry pressing; s3, lime is mixed and added during tapping of the calcium aluminate pre-molten slag converter, molten steel is obtained after tapping is finished, the refining slag balls are added into the molten steel to the surface of the molten steel, soft blowing is carried out, and a steel ladle slag surface is formed; and S4, the refining slag balls and lime are added to the surface of the steel ladle slag again, heating, slagging and desulfurization are conducted, and the alumin-barium-Ca2C refining slag is obtained. The raw materials are simple and extremely easy to obtain, and meanwhile, the adopted low-nitrogen aluminum ash and industrial cryolite are solid wastes of an aluminum factory, so that the pressure of recycling of metallurgical solid wastes is relieved.

The invention relates to a high-Ni alloy flux-cored wire for 9% Ni steel welding, which is prepared by coating a flux core with a nickel-based steel strip, and the flux core comprises the following components in percentage by weight: 18.0-30.0% of metal nickel powder, 5.0-8.0% of metal chromium powder, 5.0-9.0% of metal molybdenum powder, 1-2% of metal tungsten powder, 20.0-30.0% of rutile, 1.0-3.0% of quartz, 2.0-5.0% of albite, 1.0-3.0% of potassium feldspar, 0.5-3.0% of mica, 1.0-4.0% of cryolite, 0.2-0.8% of self-made raw material and the balance of reduced iron powder and inevitable impurities. The flux-cored wire belongs to a hastelloy system and is particularly suitable for welding of horizontal position welding and vertical position welding of the marine LNG storage tank, the mechanical performance of cladding metal of the flux-cored wire can reach 50 J or above at the low-temperature impact of-196 DEG C, the tensile strength is larger than 700 MPa, and the flux-cored wire is excellent in crack resistance and comprehensive performance.

The invention belongs to the technical field of aluminum electrolysis, and relates to preparation and application of a metal ceramic inert anode material for aluminum electrolysis. The material for the metal ceramic inert anode is formed by compounding a high-entropy alloy phase and a ceramic phase; according to the preparation method disclosed by the invention, the AlCrFeNiV high-entropy alloy and the NiFe2O4 spinel ceramic are compounded to prepare the metal oxide ceramic. The manufacturing method of the metal ceramic inert anode is easy to operate, efficient and beneficial to application and popularization. And in an electrolytic test with the electrolyte being a cryolite-aluminum oxide system at 960 DEG C, good high-temperature conductivity, electrochemical stability, corrosion resistance and thermal shock resistance are achieved.

The invention discloses a modification and grain refiner for Al-Si series die-casting aluminum alloy, which comprises the following components in mass percentage: 60-80% of rare earth aluminum alloy powder, 19-39% of auxiliary agent A, and 0.1-1.0% of auxiliary agent B; in the rare earth aluminum alloy powder, rare earth elements account for 2-20% of the total amount, the total amount of Fe and Si is ≤0.1%, and the balance is aluminum; the rare earth element is any one or a combination of two of La, Ce, Y, Er, and Sc; the auxiliary agent A comprises light calcium carbonate, sodium cryolite, potassium cryolite, sodium fluorosilicate, lithium fluoride, potassium fluoride, sodium fluoride, aluminum fluoride, sodium chloride, potassium chloride, potassium fluoroborate, magnesium chloride, and hexachloroethane; the auxiliary agent B comprises polyethylene glycol and stearamide. The modification and grain refiner obtained by mixing rare earth aluminum alloy powder, additive A and additive B can be evenly dispersed in the aluminum alloy melt to play the role of long-term modification and grain refinement as well as refining and dehydrogenation.

The invention discloses a method for preparing an aluminum-titanium intermediate alloy through aluminothermic self-reduction of molten salt, which comprises the following steps: selecting cryolite molten salt for aluminum electrolysis as a reaction medium, taking molten aluminum as a reducing agent and taking TiO2 as a raw material; the method comprises the steps that cryolite molten salt with a certain proportion is firstly put into a reduction device, a certain amount of TiO2 powder is added, stirring is conducted for 10-30 min under the inert atmosphere condition, and TiO2 is sufficiently and rapidly dissolved in the molten salt; molten aluminum is added under the inert atmosphere and the stirring condition, after aluminothermic self-reduction is conducted for 10-60 min, standing is conducted for a certain time to enable an alloy phase and molten salt to be layered, and then a metal phase and molten salt are separated. According to the invention, the environment-friendly TiO2 is adopted as a raw material to directly prepare the aluminum-titanium intermediate alloy, so that the production cost is greatly reduced; the heat generated by aluminum reduction is used for maintaining the reaction, the molten aluminum is prevented from being oxidized in the inert atmosphere, the dissolution speed of TiO2 dissolved in cryolite melt can be increased through reduction in the stirring environment, the dynamic condition of aluminum reduction is also strengthened, and the speed of in-situ generation of the aluminum-titanium intermediate alloy is greatly increased.

The invention belongs to the technical field of aluminum industry solid hazardous waste resource utilization, and relates to a secondary aluminum ash and overhaul slag co-processing method which comprises the following steps: S1, crushing secondary aluminum ash, adding concentrated sulfuric acid, uniformly mixing, and roasting to obtain clinker; adding water into the clinker, leaching and filtering to obtain filtrate A and aluminum oxide; s2, crushing the overhaul slag, adding the filtrate A, leaching and filtering to obtain filtrate B and leaching slag; s3, adjusting the pH value of the filtrate B to 1-11, reacting, and filtering to obtain filtrate C and cryolite; and crystallizing the filtrate C to obtain sodium sulfate. The concentrated sulfuric acid mixed roasting process is adopted for the secondary aluminum ash, reaction of concentrated sulfuric acid and alpha-Al2O3 with MgAl2O4 is promoted under the high-temperature condition, aluminum in the secondary aluminum ash is converted into soluble aluminum sulfate, and therefore the leaching rate of aluminum is increased.

The invention provides a method for preparing spherical aluminum tantalum alloy powder based on segmented voltage molten salt electrolysis. The method comprises the following steps: mixing Ta2O5 powder with a pore-forming agent and a conductive agent, pressing into a sheet, sintering at high temperature to prepare a Ta2O5 cathode sheet, carrying out segmented electrolysis in cryolite-based molten salt by taking graphite as an anode, and carrying out electrolysis at low voltage in the first stage, so that Ta2O5 is subjected to solid-state electrodeoxidation to be converted into tantalum particles; and then, the voltage is increased, aluminum ions in the molten salt are electrically deposited on the surfaces of the tantalum particles to form metal aluminum, aluminum-tantalum alloying reaction is induced, and the alloy product spontaneously forms spherical particles through the reaction heat release effect. The spherical aluminum tantalum alloy powder has the advantages of being short in technological process and low in cost, and the spherical aluminum tantalum alloy powder is uniform in particle size, high in sphericity degree, good in fluidity and suitable for the technical fields of laser beam / electron beam 3D printing, cladding forming, injection forming, thermal spraying and the like.

The invention provides a sorting method for aluminum electrolysis anode scrap fine particles, and belongs to the field of solid waste treatment. The method comprises the steps that the aluminum electrolysis anode scrap fine particulate matter is subjected to first-stage screening classification, and first-stage oversize products and first-stage undersize products are obtained; the first-section oversize product is subjected to first dense medium cyclone separation, and first gravity separation refined carbon and first gravity separation tailings are obtained; the first-section screen underflow is subjected to first spiral chute separation, and first refined carbon and first tailings are obtained; the first gravity separation tailings are subjected to second dense medium cyclone separation, and second gravity separation cryolite concentrate and second gravity separation tailings are obtained; the first tailings are subjected to second spiral chute separation, and second cryolite concentrate and second tailings are obtained; and the first gravity concentration refined carbon and the first refined carbon are combined to obtain refined carbon, and the second gravity concentration cryolite concentrate and the second cryolite concentrate are combined to obtain cryolite concentrate. According to the method, a reselection process more adaptive to the physical property of the anode scrap is introduced, and efficient separation of carbon-ash and cryolite-ash is achieved through the material density difference.

The present invention relates to an improved process for the recovery of valuables in the form of graphitic carbon fractions, cryolite, sodium fluoride, sodium carbonate / sulphate, and mixed hydroxides from spent anode dust and first-cut spent pot lining materials obtained from electrolytic reduction cells which are used to produce aluminium metal. The recovered graphite has various applications in electrostatic charge dissipative coating, Li-Battery and so on.

The application relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method thereof. The high-temperature-resistant flux-cored wire containing rare earth elements comprises a wire sheath and a core; the core comprises the following raw materials: dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, aluminiferous iron, potassium cryolite, potassium titanate, sodium titanate, iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, chromium-iron nitride, bismuth oxide, an additive, and the balance of reduced iron powder; the additive is a mixture of zirconium-iron alloy, ferrotitanium alloy and aluminum-magnesium alloy. The application introduces a specific alloy additive into the core to protect the transition of the rare earth yttrium, optimizes the welding performance of the yttrium and multiple components in cooperation, matches the 253MA heat-resistant steel, adjusts the components of the molten slag and the electric arc, and reasonably processes the technology, so that the welding quality of the wire is improved.

The present application relates to a kind of rotary kiln device of overhauling slag and lithiumite / cell powder calcination, it is related to rotary kiln related technical field, including supporting platform, feeding equipment, built-in cylinder, sliding groove, cylinder, built-in groove, anti-conclusion component, convex drag reduction component, extrusion type gas blowing component, cleaning component, the present application can solve in the mixed calcination process of overhauling slag and lithiumite / cell powder, fluoride in overhauling slag, cryolite and metal salt in cell powder, under high temperature environment of 800-1000 ℃, complex physical and chemical reaction occurs easily, form low melting point eutectic liquid phase, these liquid phase material has extremely high viscosity, surface tension and adhesion, will firmly adhere to kiln wall, only rely on gravity, these melts can only extremely slowly "creep" or "slip" on kiln wall surface, its root firmly adheres to the surface of heat-resistant layer, when kiln body rotates and it enters high temperature zone again, these melts will be re-baked hard, cause ring problem.

The invention provides a composite refining agent for impurity removal of scrap brass and application of the composite refining agent, and the composite refining agent comprises a Cu-Y intermediate alloy, a Cu-Ti intermediate alloy, a Cu-B intermediate alloy, an Mg-Ca intermediate alloy, lime, sodium carbonate, pyroborax, fluorite, sodium fluoride and cryolite. Aiming at the impurities of iron, lead, bismuth and tin in the yellow scrap copper raw material, the composite refining agent can effectively remove the impurities of iron, lead, bismuth and tin, the deoxidation capacity is high, slag is easy to clean, meanwhile, Y, Ti, B, Ca and the like serve as beneficial elements of an alterant, ingot casting grains can be effectively refined, the metallurgical quality of brass alloy is improved, and the service life of the alloy is prolonged. And the hot and cold processing properties and mechanical properties of the brass alloy are improved, so that the regeneration and cyclic utilization of the scrap brass are realized.

The application provides a method for treating and recycling ternary iron-removing aluminum slag and lithium-rich aluminum electrolyte slag, and belongs to the technical field of lithium resource recycling and utilization, and comprises the following steps: preparing an aluminum sulfate solution; pretreating the lithium-rich aluminum electrolyte slag; heating and dissolving; fluorine-aluminum precipitation; evaporation and concentration; alkali impurity removal; and lithium precipitation.The application uses ternary iron-removing aluminum slag as an aluminum source and adopts an aluminum salt leaching process to treat and recycle the lithium-rich aluminum electrolyte slag, thereby solving the problem of large aluminum salt consumption, recycling the ternary iron-removing aluminum slag and the lithium-rich aluminum electrolyte slag, achieving a fluorine resource utilization rate of more than 95%, and achieving a lithium resource recycling rate of more than 96%. The prepared regenerated cryolite and battery-grade lithium carbonate both meet national standards and industry standards.The application has the advantages of simple operation, low cost, green environmental protection, high recycling rate, high social value and considerable economic benefits.

The invention belongs to the technical field of solid waste treatment, and provides a resourceful treatment method for solid waste of an electrolytic aluminum factory. According to the method, sodium hypochlorite is added in the wet grinding process, so that cyanide in the solid waste of the electrolytic aluminum factory is oxidized into CO2 and N2, environmental pollution and safety risks caused by the solid waste of the electrolytic aluminum factory are thoroughly eliminated, and harmlessness is achieved. The fluorine source is used as the leaching agent, so that the molecular ratio of the cryolite can be adjusted, and the quality of the regenerated cryolite is improved; hydrochloric acid is used as a leaching agent, so that strict requirements on sulfur content of recycled electrolyte in an electrolytic aluminum factory are met. And meanwhile, no waste gas is generated by the resourceful treatment method. According to the resourceful treatment method, energy consumption is low, no acid mist is released in the operation process, the lithium yield is high, the lithium content in the solid waste of the electrolytic aluminum factory can be reduced to 0.025% from 0.4-2%, cryolite and carbon powder are obtained after filter residues obtained after lithium extraction through leaching are rinsed, separated and dried, and comprehensive resourceful utilization is achieved.

The application belongs to the technical field of drying processing, in particular to a drying device for an ice crystal production line, which comprises a butt joint component, left and right sides of the butt joint component are symmetrically provided with traction components, a drying component is arranged on one side of the top of the traction component close to the butt joint component, and a pressurizing component is arranged on the other side of the top of the traction component away from the butt joint component; the pressurizing component comprises an outer rotating cylinder shell, and an oil tank is fixedly connected to the shaft center of the inner cavity of the outer rotating cylinder shell. The device can simultaneously spray fire from the inside and outside of the mesh baffle through the inner flame spray head and the ignition lance, uniformly heat the ice crystal inside and outside of the mesh baffle, and avoid the problems of uneven heating of the ice crystal and over-drying of the ice crystal, thereby avoiding the problem of burning of the ice crystal.

The invention belongs to the technical field of refined aluminum preparation, and particularly relates to a preparation method of an electrolyte for preparing refined aluminum through a three-layer liquid electrolysis method. The method comprises the following steps: mixing electrolyte raw materials, and sequentially carrying out melting-pre-purification treatment and electrolytic purification treatment to obtain a purified electrolyte; and carrying out vacuum extraction on the purified electrolyte to obtain the electrolyte for preparing the refined aluminum by the three-layer liquid electrolysis method, the electrolyte is prepared from the following raw materials in percentage by mass: 60 to 61 percent of barium chloride, 23 to 24 percent of cryolite, 12 to 13 percent of aluminum fluoride and 3 to 4 percent of sodium chloride. Impurities are removed through electrolytic purification, the prepared electrolyte has reasonable primary crystal temperature, molecular ratio and electric conductivity, the phenomena of upturning, firing and more precipitates generated in the refined aluminum production process of the electrolyte can be greatly reduced, the quality grade of refined aluminum is improved, and the electricity unit consumption of refined aluminum liquid is reduced.

This invention relates to the field of welding materials technology, and proposes a stainless steel flux-cored welding wire and its preparation method. The stainless steel flux-cored welding wire consists of a flux core and an outer sheath covering the surface of the flux core. The flux core is composed of the following raw materials in weight percentages: rutile 8%~12%, fluorite 4%~6%, cryolite 1%~2%, potassium feldspar 0.1%~0.3%, zircon sand 0.1%~0.5%, metallic aluminum 0.2%~0.4%, metallic magnesium 0.3%~0.6%, metallic silicon 0.5%~1.0%, calcium carbonate 0.5%~1.5%, with the balance being iron powder. The weight percentages must satisfy (rutile + fluorite) / (metallic aluminum + metallic magnesium + metallic silicon) = 9~12. This technical solution solves the problem of insufficient porosity resistance in welds formed by stainless steel flux-cored welding wires in related technologies.

The invention discloses a high-hardness wear-resistant flux-cored wire for open arc surfacing of coal mine machinery, which belongs to the technical field of welding materials and consists of flux-cored powder and a carbon steel strip. The flux core powder comprises the following raw materials of 20%-80% of high-carbon ferrochrome, 1%-8% of high-carbon ferromanganese, 1%-10% of graphite, 1%-5% of ferrotitanium, 1%-5% of silicon carbide, 0.5%-4% of boron carbide and 0.1%-2% of cryolite. The welding wire is applied to repairing of the chain wheel of the scraper conveyor of the coal mine, the service life is 2.3 times that of a common welding wire, and the comprehensive cost is reduced by 40%.

The application discloses a flux-cored wire for high manganese steel independent of nickel powder and a preparation method thereof, and belongs to the technical field of the flux-cored wire.The flux-cored wire comprises a stainless steel strip and a core powder filled in the stainless steel strip, and the core powder comprises the following components in percentage by mass: 35%-45% of manganese powder, 1%-2% of aluminum-magnesium alloy powder, 0.5%-1.75% of niobium powder, 0.5%-1% of cerium oxide, 2%-4% of calcium fluoride, 1%-2% of cryolite, 1.5%-3% of magnesium carbonate, 1%-2.5% of silicon-calcium-barium composite agent, 25%-35% of manganese nitride, 1%-2% of graphite, and the balance of iron powder; and the content of Ni in the stainless steel strip is 8%-11%. The application effectively solves the technical problem that the weld strength and toughness of the conventional stainless steel wire are difficult to be considered in a deep cold environment, realizes the stabilization of the weld structure in the deep cold environment, and provides an effective solution for welding liquefied natural gas equipment, aerospace fuel storage tanks and other extreme environment structures.

The present application relates to a kind of methods for treating fluorine and lithium in acid leaching cathode alkali leaching residue and combined processing alkali leaching waste liquid, belong to aluminum electrolysis waste cathode recovery technical field, the alkali leaching residue of aluminum electrolysis waste cathode is added in AlCl3 solution ultrasonic leaching, and using hydrochloric acid adjusts leaching pH value, after leaching, solid-liquid separation obtains primary carbon powder and first filtrate;First filtrate returns system and is recycled, obtains electrolyte content relatively saturated final leaching solution;Primary carbon powder is washed with deionized water and is treated to obtain high-purity carbon powder;Final leaching solution is mixed with waste cathode alkali waste leaching liquid and is precipitated to obtain lithium-containing cryolite and precipitate liquid, and precipitate liquid can return alkali leaching system and be used for preparing alkali liquor.The present application effectively realizes the recovery of valuable material in alkali leaching residue and alkali leaching waste liquid in aluminum electrolysis waste cathode, simultaneously realizes the harmless treatment of waste cathode, greatly simplifies the recovery process of valuable material in alkali leaching residue and alkali leaching waste liquid of aluminum electrolysis waste cathode.

The invention discloses a method for preparing vanadium metal powder based on a cryolite system, which comprises the following steps: mixing vanadium monoxide (VO) serving as a vanadium source, magnesium metal particles and cryolite in a mass ratio of (10-20): (6-12): (30-60), and roasting and reducing for 2-6 hours at 800-1000 DEG C under the protection of inert gas. After the reaction is completed, leaching a core material in a product by using a 10-15% zirconium chloride and other chloride solution, and drying to obtain metal vanadium powder; and the leached filtrate can be regenerated into cryolite for recycling after being treated. VO is selected as a vanadium source, and consumption of a reducing agent is reduced from the source; the metal magnesium is selected as a reducing agent, the activation energy is reduced by utilizing the higher reaction activity of the magnesium, and the key is that the magnesium and the vanadium are subjected to non-alloying reaction, so that the product purity is fundamentally guaranteed; the cryolite is used for replacing chloride molten salt, so that the obstruction of oxide layer by-products can be effectively broken, the reaction activity can be improved, and the cryolite can be recycled. The method has the advantages of simple process and high product purity, and is especially suitable for the requirements of high-end fields on vanadium materials.