92 results about "Cryolite" patented technology

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 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 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 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 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 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 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.

The invention discloses a production process for improving the conductivity of a conductive aluminum strip. The preparation process comprises the steps of preparation of an efficient refining agent, pretreatment and smelting of metal particles, ingot casting, cold rolling and the like. The synergistic purification effect of cryolite, borax and rare earth is utilized, doping of impurities such as oxygen, hydrogen, iron, silicon and vanadium in molten aluminum is reduced in the refining process, and the molten aluminum is primarily purified; in the refining process, the cold charge ratio is controlled, and an aluminum-boron-titanium refiner is added, so that uniform and large crystal grains grow in the ingot cooling and annealing process, the grain boundary area is reduced, the conductivity and mechanical property of the aluminum alloy are improved, impurities can be further removed through boron, molten aluminum can be further purified, the high conductivity of the aluminum alloy is achieved, and meanwhile the good mechanical property is achieved.

The application discloses a harmless treatment method of aluminum electrolysis overhaul slag, and comprises the following steps: removing large particle iron through magnetic separation, recovering aluminum particles, high-temperature roasting in a clinker kiln, carbon removal through flotation, obtaining high-purity carbon through carbon acid and alkali purification, obtaining iron minerals through flotation, obtaining solid cryolite Na3AlF6 through drum drying, realizing aluminum and silicon mineral separation through reverse flotation desilication, obtaining aluminum mineral liquid, and obtaining aluminum oxide after roasting the aluminum mineral liquid.The application adopts a method of high-temperature roasting, flotation and acid-alkali treatment cooperation, high-temperature roasting makes fluoride in the overhaul slag into harmless calcium fluoride, and toxic cyanide is cracked in high temperature to generate nitrogen oxide, realizing harmless treatment of cyanide.The application realizes effective separation of carbon material, iron ore powder, aluminum ore powder and solid cryolite and other substances in the overhaul slag through multiple flotation treatments, realizes resource utilization of useful elements, opens up a new way for harmless disposal and resource utilization of the overhaul slag, and has very significant economic benefits.

The invention provides a welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding and a preparation method of the welding rod, and relates to the technical field of welding materials. The welding rod for nickel-chromium-cobalt-molybdenum high-temperature alloy welding comprises a core wire and a coating, and the coating comprises, by mass, 22%-30% of rutile, 29%-38% of marble, 3.5%-5.0% of fluorite, 18%-24% of cryolite, 3.5%-5.0% of potassium titanate, 0.8%-1.5% of cobalt powder, 0.8%-1.5% of molybdenum powder, 1.5%-3.0% of ferroniobium, 0.8%-1.5% of manganese metal, 0.8%-1.5% of reduced iron powder, 0.4%-1.0% of sodium alginate, 0.8%-1.5% of sodium carbonate and 0.4%-1.0% of CMC. When the welding rod is used for carrying out submerged arc horizontal position welding on the nickel-chromium-cobalt-molybdenum high-temperature alloy, the electric arc stability is good, deslagging is good, forming is attractive, deslagging is easy, deposited metal components are stable, and the mechanical property is excellent.

The invention discloses a resource recycling method for electrolytic aluminum overhaul slag, and relates to the technical field of resource recycling. The recovery method comprises the following steps: crushing the overhaul slag, stirring with water, washing, and separating to obtain water washing liquid and washing slag; washing residues are leached by adopting an acid solution in a synergistic heating manner, cryolite and other substances in the washing residues are efficiently dissolved, and leached residues are mainly carbon materials. And hydrogen fluoride gas generated in the leaching process is introduced into alkaline water washing liquid, aluminum salt is added for impurity removal, and a sodium fluoride product is obtained through evaporative crystallization. And adding ammonia water into the leachate to adjust the pH value, cooling and crystallizing to obtain an aluminum ammonium sulfate product for recovering aluminum. And the separated mother liquor is subjected to impurity removal, alkalization, evaporation and concentration, ammonia gas is recovered, and a lithium-rich concentrated solution is obtained. Extracting lithium from the concentrated solution, and evaporating raffinate to obtain a sodium sulfate product; and the lithium-loaded organic phase is subjected to reverse extraction by phosphoric acid, and a lithium dihydrogen phosphate product is directly obtained after reverse extraction liquid is subjected to pH-controlled evaporation. According to the invention, collaborative recovery and high-value utilization of fluorine, aluminum, sodium and lithium resources are realized.

This invention relates to a protective slag for sulfur-containing free-cutting steel crystallizers using photovoltaic silicon mud and its preparation method. The protective slag of this invention contains, by mass percentage, 30.6–31.6 wt% CaO, 36.7–37.7 wt% SiO2, 6.1–7.1 wt% Al2O3, 8.2–9.2 wt% Na2O, 5.0–6.0 wt% F, and 9.0–10.0 wt% C. 固 H2O up to 0.5 wt%; C 固 The carbon in the protective slag is fixed. Raw materials include 7-9 wt% silica mud, 14-16 wt% blast furnace slag, 24-26 wt% phosphorus slag, 14-16 wt% silicate cement, 4-6 wt% wollastonite, 10-12 wt% soda ash, 2-4 wt% fluorite, 6-8 wt% cryolite, and 10-12 wt% carbon powder. The preparation method includes batching, slurry preparation (solid content 40-45%), spray granulation (spray gun orifice diameter 1.0-1.5 mm, inlet temperature 450-480℃), and post-treatment. This invention enables the utilization of photovoltaic silica mud, reducing the cost of protective slag containing silica mud by 870 yuan per ton, and increasing the flaw detection pass rate of continuously cast billets from 25.99% to 55.17%, thus possessing both energy-saving and emission-reduction value and a circular economy value.

This invention relates to the field of lithium-ion battery technology, specifically to a method for recycling aluminum metal from high-aluminum cathode material black powder in waste lithium batteries. The method includes: dry mixing the black powder with anhydrous sodium sulfate, acidifying with concentrated sulfuric acid, spraying with an aqueous sodium sulfate solution and adding sodium bisulfate monohydrate to obtain a pretreated material; after staged acidification and roasting, lithium is extracted by water leaching; the water leaching residue is leached under low-acid conditions; the low-acid leachate is precipitated with sodium fluoride to obtain cryolite; the post-aluminum precipitate is then treated with iron removal and pH adjustment to prepare a nickel-cobalt-manganese extraction pre-liquid. This invention, by controlling the distribution of sulfate ions on the aluminum surface and staged roasting, reduces the gas production and aluminum load during low-acid leaching, combined with the directional precipitation of aluminum using low-pH cryolite. This achieves efficient lithium recovery while significantly reducing the loss of nickel, cobalt, and manganese with the aluminum slag. Aluminum is recovered in the form of cryolite for high-value recovery, greatly improving resource utilization and process safety.

The present application relates to a kind of aluminium electrolysis solid waste processing method, comprising the following steps: providing aluminium electrolysis solid waste powder;Wherein, the aluminium electrolysis solid waste powder includes overhaul slag and waste slag, the overhaul slag includes one or several of waste refractory material and waste cathode, the waste slag includes one or two of waste carbon residue and waste electrolyte, and the mass ratio of overhaul slag and waste slag is 6-8:1-4;The aluminium electrolysis solid waste powder is mixed with water at 1:3-5 solid-liquid mass ratio, after reaction at 80-95 DEG C, solid-liquid separation, obtains leaching residue and leaching solution;After acid leaching to the leaching residue, solid-liquid separation, obtains acid leaching residue and lithium-rich acid leaching solution.The processing method of the present application can simultaneously realize to aluminium electrolysis waste refractory material, waste slag and other various aluminium electrolysis solid waste.The processing method of the present application can realize the full quantization recovery of carbon, lithium, cryolite and other substances in aluminium electrolysis solid waste, and the economic benefit is good.

The invention relates to the field of gate valve casting, in particular to a high-density high-pressure-resistant nodular cast iron gate valve casting technology. The raw materials are selected from 40-60 parts of Q10 high-purity pig iron, 30-40 parts of low-carbon waste steel, 25-35 parts of ductile iron foundry returns, 1.5-2.5 parts of a calcium carbide desulfurizer, 0.5-1 part of cryolite powder, 2-3 parts of magnesium-rare earth-calcium alloy wires, 0.5-1 part of a barium-containing ferrosilicon alloy, 0.3-0.5 part of a strontium-containing ferrosilicon alloy and 0.2-0.4 part of a zirconium-containing ferrosilicon alloy. According to the method, the nano particles are added to enable the graphite nodules to be finer and denser, liquid nitrogen is used for cooling and eliminating internal holes, then pouring is conducted in a vacuum environment to avoid bubbles, then subzero treatment is conducted to enhance the hardness of the material, and finally laser is used for cladding the superhard alloy layer on the sealing face, so that the strength, compactness and temperature resistance limit of the nodular cast iron can be greatly enhanced; and the use function is improved.

The invention relates to the technical field of dangerous solid waste treatment and resource utilization, in particular to an aluminum electrolysis overhaul slag fluoride enhanced leaching and resource recycling method. Comprising the following steps: adding pretreated overhaul slag into a complexing reaction solution of boric acid containing a dispersing agent and gluconate, and pulping; sealing the system, heating, and implementing pulse type micro-negative pressure degassing operation in which vacuumizing and normal pressure recovery are alternated during constant-temperature leaching; after the reaction is finished, carrying out thermal-state solid-liquid separation and tailing washing, and merging to obtain clear filtrate; crystal seeds are added into the filtrate, an aluminum source solution is dropwise added, the pH value is increased, solid-liquid separation is performed after constant-temperature curing, and synthetic cryolite is obtained; and supplementing the pH buffer agent to the clear liquid and then circularly returning to the liquid preparation process. According to the method, fluorine and aluminum are cooperatively extracted under the weak acid condition, generation of silicic acid gel is inhibited, equipment corrosion is reduced, mass transfer in pores is enhanced in combination with micro-negative pressure operation, and low-energy-consumption recovery of fluoride salt and closed-loop circulation of a working solution are achieved through pH regulation and control.

The invention discloses a method for applying a silicon carbide electrode to step-by-step electrolysis of aluminum, belongs to the technical field of electrolytic aluminum, and aims to solve the problems that a carbon anode material adopted by the conventional electrolytic aluminum is easy to corrode in a high-temperature melting environment, the anode generates oxygen reaction loss, the service life is short, frequent replacement is needed, and the production cost is increased. Through combination of a step-by-step electrolysis process and a silicon carbide electrode, the production efficiency of electrolytic aluminum is improved, local concentration fluctuation is easily caused by direct feeding of aluminum oxide into an electrolytic bath in a traditional process, uniform mixing of aluminum oxide and cryolite is realized in advance through an independent dissolving tank, and under the precise temperature control of 950-1100 DEG C and the stirring effect of 30-50 r / min, the aluminum oxide and cryolite are mixed uniformly, so that the production efficiency of the electrolytic aluminum is improved. The aluminum oxide is completely converted into conductive melt, reaction fluctuation caused by uneven concentration is eliminated from the source, aluminum ions in an electrolytic bath are more continuously and uniformly separated out through homogenization treatment, the voltage of electrolytic aluminum is greatly reduced, the stable aluminum electrolysis process between 2.0 volts and 4.2 volts is achieved, and the energy utilization efficiency of the electrolytic aluminum is greatly improved.

The invention relates to the technical field of steel smelting, in particular to a method for reinforced deoxidation of a slag surface in a rail steel LF refining process. The method comprises the following steps: converter smelting: a converter adopts a top-bottom combined blowing process, inert gas is blown from the bottom, and tapping is carried out when the end point of the converter is reached; after tapping is completed, the steel ladle is conveyed to a furnace rear argon blowing station for argon blowing; wherein in the tapping process, a silicon-calcium alloy is added for deoxidation, then a silicon-manganese alloy and a low-aluminum silicon-iron alloy are added for alloying, active lime is added for slagging, and a carburant is added for recarburization; in the preparation stage, molten steel is conveyed to an LF furnace refining station from the furnace rear argon blowing station, a gas pipe is connected, and the slag surface is blown open in a bottom blowing inert gas mode in the process that the molten steel is about to enter the station; lF refining: adding a silicon-calcium-barium alloy to the slag surface when an LF steel ladle enters a station, electrifying and heating, and then adding refining slag and cryolite for slagging; after the LF slagging is finished, adding the silicon-calcium-barium alloy again, and heating to 1550-1580 DEG C;

The invention relates to a method for extracting lithium from waste electrolyte and preparing cryolite in a linkage manner, and belongs to the technical field of resource recovery and inorganic material preparation. According to the method, through the steps of pretreatment, selective leaching, impurity removal and purification, lithium salt preparation, fluorine and aluminum synergistic reaction and the like, efficient recovery of lithium resources in the waste electrolyte is achieved, meanwhile, high-purity cryolite is prepared in a linkage mode, and the problems that in the traditional waste electrolyte treatment process, the resource utilization rate is low, secondary pollution is serious, and the added value of products is low are solved. The method is short in process route, low in energy consumption and good in environmental protection property, achieves the purposes of treating waste with waste and recycling resources, and has remarkable economic and environmental benefits.

The invention relates to a secondary aluminum value-added treatment method based on molten salt electrolysis eutectoid, which comprises the following steps: in an industrial aluminum electrolysis cell, directly electrolyzing by taking a cryolite melt system as an electrolyte to obtain a target alloy; during electrolysis, aluminum oxide and silicon dioxide are added into the industrial aluminum electrolysis cell, so that the concentration of the aluminum oxide in the electrolyte is 1-3.5 wt%, and the concentration of the silicon dioxide in the electrolyte is 3-4.5 wt%; secondary aluminum powder is added into the industrial aluminum electrolysis cell, so that the silicon content in the target alloy reaches the target range; wherein the molecular ratio of the cryolite melt system is 2.3 to 2.6. According to the treatment method, the treatment process of the secondary aluminum can be shortened, the treatment energy consumption and the consumption of chemicals such as a refining agent and a slagging-off agent are reduced, energy conservation, environmental protection, cost reduction and efficiency improvement are facilitated, the components of the obtained target alloy are uniform, accurate and controllable, and the treatment method is an ideal path for the aluminum alloy preparation and secondary aluminum value-added treatment technology.

The application discloses a flux for smelting scrap brass particles, and components include 5-40% of sodium carbonate Na2CO3, 10-40% of cryolite Na3AlF6, 10-30% of sodium fluoride NaF, and the rest is charcoal powder and inevitable impurities in terms of weight fraction. NaF can reduce the melting point of furnace ash, melt copper oxide and cuprous oxide, and is used for forming corresponding low-melting fluorinated salt. Carbon C is used for reducing copper oxide and cuprous oxide, destroying the surface layer of copper particles, and the generated Na2O.ZnO has the function of fluffy furnace ash. CuF2 is a hard and brittle substance, and is used for peeling off the copper oxide shell layer. Under the joint action of components, the effect of efficiently improving the copper particle yield is finally realized, and the application is safe and harmless. The application further discloses a preparation method of the flux for smelting scrap brass particles, and the preparation method is simple. The application further discloses a use method of the flux for smelting scrap brass particles, and the use method is convenient.