22 results about "Cryolite" patented technology

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 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.

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 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 provides a method for synergistically recovering fluorine and rare earth from fluorine-containing rare earth electrolytic slag, which comprises the following steps: roasting the fluorine-containing rare earth electrolytic slag with a lithium source to convert fluorine into lithium fluoride, carrying out vacuum distillation purification, reacting with calcium hydroxide to obtain lithium hydroxide and calcium fluoride, and combining the lithium hydroxide with carbon dioxide to prepare lithium carbonate. Calcium fluoride reacts with sulfuric acid to prepare hydrofluoric acid, the hydrofluoric acid is used for synthesizing cryolite with an aluminum-containing solution, hydrochloric acid which is a byproduct of the reaction can be recycled for the acid leaching step, a solution containing sodium silicate is obtained through alkali treatment of residues, the solution containing sodium silicate and recycled rare earth oxide are further synthesized into rare earth silicate, and comprehensive utilization of elements such as fluorine, rare earth and silicon is achieved. According to the method provided by the invention, fluorine element and rare earth element recovery in the fluorine-containing rare earth electrolytic slag can be dominated, and efficient recovery of multiple components such as lithium, aluminum, silicon and the like can be synergistically realized.

A kind of production device of cryolite suspension, including horizontal reaction tank body, aluminium hydroxide powder bin, sodium hydroxide powder bin and stirring mixing mechanism;Horizontal reaction tank body includes vertical plate located in two side walls, circular arc plate located in bottom, cover plate located in top and end head located in two ends, stirring mixing mechanism includes mixing motor a and mixing motor b respectively arranged on the end head of two ends, the rotating shaft of mixing motor a and mixing motor b is respectively connected with horizontal 316L stainless steel spiral shaft a and horizontal 316L stainless steel spiral shaft b arranged in horizontal reaction tank body, the bottom center of circular arc plate is equipped with cryolite suspension discharge port with discharge valve, the middle part of cover plate is equipped with ammonium fluoride solution liquid inlet interface and exhaust port.The advantages of the utility model are: the axial mixing of horizontal reaction tank body can reduce the settlement of aluminium hydroxide and sodium hydroxide, accelerate dissolution and reaction, and the concentration uniformity of reaction solution is significantly improved.

The utility model relates to the technical field of cryolite production, in particular to drying equipment for cryolite production, which comprises a bottom plate, a drying box, a partition plate, an inclined plate, a heating pipe, a screening component, a cleaning component, an opening and closing component, a collecting box, two guide rods and two guide blocks. The two guide blocks are slidably mounted on the two guide rods correspondingly, the outer walls of the two sides of the drying box are connected with the two guide blocks correspondingly, the partition plate is mounted in the drying box, the screening assembly is mounted at the top of the bottom plate, and the top end of the screening assembly extends to the bottom of the drying box. The cleaning assembly is installed at the top end of the interior of the drying box, the opening and closing assembly is installed on the outer wall of the drying box, the collecting box is installed at the top of the bottom plate, the collecting box is located below the channel, impurities gathered in the drying box do not need to be manually removed, and the drying box is very convenient to use.

This invention provides a recycled carbon anode, its preparation method, and its application in electrolytic aluminum, relating to the field of aluminum electrolysis technology. The recycled carbon anode has an oxygen-containing functional group on its surface carbon framework. X-ray photoelectron spectroscopy shows that the surface O / C atomic ratio of the recycled carbon anode is between 0.05 and 0.25, and the static wetting angle of the recycled carbon anode in molten cryolite electrolyte at 960°C is less than 60°. The preparation method includes: using molten carbonate electrolysis to deposit CO2 on the cathode to obtain carbon material, followed by separation to obtain electrolytic carbon material; mixing a binder and the electrolytic carbon material, and then sequentially molding and calcining to obtain the recycled carbon anode. The recycled carbon anode obtained by this invention has a lower anodic reaction overpotential and preferably enables the recycling of carbon elements in the aluminum electrolysis process, showing broad application prospects.

The present application relates to the technical field of metallurgical auxiliary materials, and particularly discloses a protective slag, a preparation method and application thereof. The protective slag comprises the following raw material components in mass percentage: 1.45-1.49% of carbon black, 9.81-9.85% of medium-carbon graphite, 5.88-5.92% of high-purity graphite, 0.96-1% of cryolite, 0.96-1% of fluorite, 3.42-3.46% of sodium carbonate, 0.96-1% of dextrin, 2.44-2.48% of sodium carboxymethyl cellulose, 4.9-4.94% of limestone, 6.86-6.9% of cement clinker, 10.01-10.05% of bauxite, 32.43-32.47% of phosphorous slag and 19.65-19.69% of wollastonite. The present application optimizes the formula and ratio of the protective slag, and the protective slag is used in straight-through water gap flat billets, thereby significantly improving the product surface qualification rate of the straight-through water gap flat billets, and avoiding the problem of cracks in the continuous casting process.

This invention belongs to the field of welding auxiliary materials technology, specifically relating to a ring-shaped gasket material for pipe welding. From the radial inner side to the radial outer side, it comprises a fusible support layer, a high-temperature resistant skeleton layer, a flexible bonding layer, and an active metallurgical layer. The fusible support layer is composed of a eutectic salt of sodium chloride, potassium chloride, and sodium silicate, which softens or partially melts at 650℃-750℃; the high-temperature resistant skeleton layer is a continuous alumina fiber woven and sintered mesh structure; the flexible bonding layer is a composite pressed layer of graphite worms and aluminosilicate fiber felt; and the active metallurgical layer is a coating layer containing titanium dioxide, cryolite, ferrosilicon powder, ferromanganese powder, and aluminum powder. This gasket addresses three practical engineering problems in pipe circumferential welding: assembly rigidity, high-temperature load-bearing capacity, and curved surface fit. Through the progressive and overlapping effect of the four-layer structure, it allows for a certain degree of asynchronous response among the layers, accommodating a certain range of assembly tolerances and welding parameter fluctuations. After welding, there are virtually no obstructions remaining inside the pipe, and the weld root is well-formed.

This invention discloses a method for producing pre-melted material from incinerated waste fly ash, comprising the following steps: 1) Raw material proportioning: By mass percentage, 20-50% of incinerated waste fly ash, 15-25% of glass powder, 5-15% of cryolite, 5-20% of quartz, and 10-25% of limestone are mixed evenly to form a mixed raw material; 2) High-temperature smelting: The mixed raw material is added to a plasma furnace and heated to 1200-1300℃; 3) Water quenching and cooling: The molten slurry is sprayed with a 3 cm diameter water pipe for water quenching and cooling; 4) Crushing and grinding: The water-quenched and cooled solid material is first crushed to a particle size ≤5 cm by a jaw crusher, and the composition of the finished product is tested to meet the requirements of SiO₂ 15-40%, CaO 15-45%, Al₂O₃ 1-10%, Na₂O 1-15%, and F 1-15%, thus obtaining the pre-melted material finished product. The present invention features a simple and efficient process, employing direct high-temperature heating. The steps are concise and the operation is controllable. The raw material ratio range is scientifically reasonable, reducing process complexity and production costs, and facilitating industrial-scale promotion.

This invention belongs to the field of inorganic fluorine chemical technology, specifically relating to a method for preparing cryolite. Sodium fluoride and sodium aluminate are dispersed in water to obtain a suspension, which is heated to 60-80°C. Carbon dioxide is introduced under an electric field while the mixture is stirred for 2-4 hours. The mixture then settles, and the solid and liquid are separated. The solid is washed and dried to obtain the cryolite product. This invention introduces a direct current electric field as a physical field control method into the traditional wet precipitation process. Without introducing any external organic or inorganic additives, it achieves precise control over the crystal nucleation rate and growth direction, ultimately obtaining cryolite with a uniform octahedral structure. This method features mild process conditions, low equipment cost, and is suitable for industrialization. The resulting product has both good fluidity and high purity, fully meeting the technical requirements of modern aluminum electrolysis industry for high-quality cryolite flux, and has significant economic value and environmental benefits.

System for melting aluminium and recycling black dross, comprising: an aluminium melting furnace (2) for melting aluminium parts into molten aluminium and a black dross recycling device for recycling black dross generated when the aluminium parts are melted into molten aluminium, wherein the aluminium melting furnace (2) comprises: a heating chamber (10) provided with heating units for heating the molten aluminium (M); a flux force application chamber (30) for applying a flux force to the molten aluminium (M); a melting chamber (20) provided with a vortex unit (21) for generating a vortex that spirally descends in the molten aluminium (M), a flux supply unit for introducing a flux into the vortex (V), and a raw material supply unit for introducing the aluminium parts into the vortex (V); and a flux passage (34) formed in such a manner as tothat it passes through a wall separating the flux force application chamber (30) and the melting chamber (20), and which transfers the molten aluminium (M), onto which the flux force is applied by an accelerator unit, into the melting chamber (20), wherein the aluminium parts comprise at least aluminium parts from used beverage cans, and the flux comprises 93 to 97 parts by weight of a mixture in which sodium chloride and potassium chloride are mixed in equal parts by weight, and 3 to 7 parts by weight of a cryolite, wherein the vortex unit (21) is attached to a side of the melting chamber (20) where it is not positioned in a straight line with the flux passage (34), and wherein, in the vortex unit (21), black dross, which is formed when inclusions contained in the molten aluminium (M) are bound by the flux, repeatedly sinks and rises in the molten aluminium (M) through the vortex.so that the black scabies accumulates into a spherical shape to form a spherical black scabies, and the black scabies recycling device (3) serves to recycle the spherical black scabies.

The application belongs to the technical field of metallurgy and relates to a pretreatment method of a beryllium sulfate solution containing fluorine, which comprises the following steps: S1, defluorination: adjusting the pH of the beryllium sulfate solution containing fluorine to 0.5-1.5 by using sodium alkali, heating to 85-95 DEG C and reacting for 90-150 min, adding a reducing agent and a defluorination agent, and filtering to obtain defluorination liquid and cryolite slag; S2, iron removal by oxidation: slowly adding an oxidizing agent to the defluorination liquid, heating to 88-95 DEG C and reacting for 16-24 h, and filtering to obtain iron removal by oxidation liquid and goethite slag; and S3, oil removal by activated carbon: adding activated carbon to the iron removal by oxidation liquid, removing oil at 45-50 DEG C for 35-45 min, and filtering to obtain a pretreatment liquid of the beryllium sulfate solution. The application applies the cryolite defluorination method and the goethite method to the pretreatment of the beryllium sulfate solution, and compared with the conventional sulfuric acid method, the amount of aluminum removal slag and iron removal slag is greatly reduced, and the requirement that high-purity beryllium oxide can be obtained without purification of beryllium oxide is realized.

This invention discloses a shaped, seepage-proof, and heat-insulating refractory brick and its masonry mortar for use in aluminum electrolysis cells. Traditional refractory bricks suffer from problems such as large joint gaps, difficult positioning, and poor sealing. The refractory brick of this invention features mortise and tenon structures on its four sides for splicing. The raw material composition and weight percentages are as follows: bauxite clinker (below 2mm): 12%–20%; soft kaolin powder (180–220 mesh): 45%–55%; quartz sand (below 1mm): 25%–32%; polylactic acid mullite powder (180–220 mesh): 2%–4%; dolomite powder (180–220 mesh): 2%–4%. The brick body of this invention uses a semi-circular mortise and tenon structure, matching the mortar to the brick material, ensuring precise positioning during construction, transforming straight joints into curved gaps, significantly extending the penetration path, and substantially improving heat insulation and seepage prevention performance. It can effectively block the penetration of cryolite, sodium vapor, and molten aluminum.

This invention relates to the field of electrochemical energy storage material preparation technology, specifically to a method and the cathode material, sodium vanadium fluorophosphate, for preparing sodium-ion batteries using electrolytic aluminum waste. The invention uses cryolite and vanadium alumina slag from electrolytic aluminum waste as raw materials. Through a process of "activation-synergistic leaching-deep selective impurity removal-precise fluoride-phosphorus control," sodium, vanadium, and fluorine resources are extracted and purified. High-performance products are synthesized through temperature-controlled seed crystal induction. Aluminum is thoroughly removed through solvent extraction / ion exchange, and the ratio is precisely controlled by an online fluoride ion monitoring system, solving the problems of complex impurities and large compositional fluctuations in the waste material. The Na3V2(PO4)2F3 prepared by this invention has a purity ≥99.2%, an iron content <30ppm, regular crystals, uniform particle size, a first discharge specific capacity ≥126mAh / g at 0.1C, and a capacity retention rate ≥92% after 500 cycles at 1C, demonstrating excellent performance.

The application provides a resourceful treatment and recovery method of waste carbon cathode, and relates to the technical field of solid waste resourceful treatment. The resourceful treatment and recovery method of waste carbon cathode comprises the following steps: step S1, raw material pretreatment; step S2, activation treatment; step S3, primary leaching; step S4, secondary leaching; step S5, cryolite extraction; and step S6, lithium extraction. The method adopts low-temperature molten salt roasting and two-stage leaching coupling, breaks through the high energy consumption and low purity bottleneck of the traditional waste carbon cathode recovery technology, realizes the harmless disposal and high-value utilization of hazardous waste, has important significance for the recycling and utilization of lithium resources, and has important significance for the sustainable development of the aluminum industry. The method provides an economic and environmentally friendly technical path for the harmless treatment and resourceful utilization of waste carbon cathode, and has a broad industrial application prospect.

The application discloses a method for extracting iron from red mud, and aims to provide a method for recovering iron from red mud. The technical scheme of the application is that red mud, calcium fluoride, calcium oxide, sodium carbonate, cryolite and reducing carbon are mixed and balling in a mass ratio of 100:0-3:0.1-5:0.1-5:0.1-5:8-18, and then are sent into a reduction furnace, and are heated to 1100-1450 DEG C and kept for 0.5-4 hours, so that a blocky silicon-iron mixture is obtained after cooling; the reducing carbon is formed by mixing graphite powder with semi-coke or with coal, the carbon content in the reducing carbon is greater than or equal to 85%, and the content of the graphite powder in the reducing carbon is greater than 50%; the purity of the calcium fluoride is greater than or equal to 80%, the purity of the calcium oxide is greater than or equal to 85%, the purity of the sodium carbonate is greater than or equal to 90%, the purity of the cryolite is greater than or equal to 90%, and the purity of the graphite powder is greater than or equal to 90%; the blocky silicon-iron mixture is ball milled into powder; and the iron in the powder is extracted by magnetic separation. The application has the advantages of high grade of the extracted iron and low consumption of raw coal, and is a method for recycling red mud resources.

This invention discloses a refractory and anti-oxidation coating for carbon electrodes and its preparation and application methods. The coating is a homogeneous and stable aqueous suspension, comprising, by weight: 28-35 parts potassium silicate, 12-18 parts sodium silicate, 18-25 parts α-alumina micro powder, 10-15 parts boron carbide micro powder, 6-10 parts nano-silicon powder, 4-7 parts cryolite micro powder, 1-3 parts magnesium fluoride micro powder, 3-5 parts mullite whiskers, 1.5-3 parts rare earth composite oxide, and silane coupling agent KH560. 0.3~0.8 parts, sodium polycarboxylate dispersant 0.6~1.2 parts, deionized water 8~15 parts; rare earth composite oxide is composed of La2O3 and CeO2 in a mass ratio of 1:1. The coating has a solid content of 68~75%, pH value of 8.8~9.5, viscosity of 35~50s, particle size D90≤4.5μm, porosity≤8%, and storage stability≥90d. Through the synergistic effect of rare earth-silane dual modification, mullite whisker reinforcement and low-temperature activation of nano-silicon powder, the coating achieves a high-temperature adhesion strength ≥2.2MPa, thermal shock resistance ≥25 cycles, and can be sintered at low temperature with excellent construction performance. It is suitable for various high-temperature working conditions such as electrolytic aluminum and ferroalloy smelting.

The present application relates to the technical field of stainless steel pipe processing, in particular to a processing technology of high-strength stainless steel pipe. The following technical scheme is specifically proposed: S1: preparing Cu@Cu3Pt nanoparticles; melting, casting, hot rolling, and annealing the Cu@Cu3Pt nanoparticles, pure copper, titanium nitride, ice crystal, and rare earth metal cerium to obtain an intermediate layer metal; S2: pre-treating one side of a stainless steel plate, and then performing sputtering treatment on the pre-treated side using pure copper as a target material to obtain a copper plating layer, thereby obtaining a plating layer stainless steel plate; S3: sequentially stacking the plating layer stainless steel plate, the intermediate layer metal, and the plating layer stainless steel plate, with the intermediate layer metal contacting the side of the plating layer stainless steel plate with the copper plating layer; and then sequentially performing hot-pressing sintering, solid solution treatment, hot rolling, and aging treatment to obtain a layered heterogeneous stainless steel plate; and S4: curling and welding the layered heterogeneous stainless steel plate to manufacture a high-strength stainless steel pipe.

This invention discloses an environmentally friendly aluminum-based steel slag modifier, its preparation method, and its application method. The preparation method includes: crushing and grinding calcium aluminate pre-melted slag and industrial cryolite, then slurrying them to form hollow granular balls; heating aluminum rods and drawing them into wires in air, then cutting them into aluminum wires; thoroughly mixing the hollow granular balls, aluminum wires, acidified graphite, and binder to form the modifier. The application method includes: pressing the modifier into elliptical modifier balls; adding the modifier balls to the surface of the ladle slag when the LF (sulfuric acid) slag exits the station; adding the modifier balls to the surface of the ladle slag when the RH (sulfuric acid) slag exits the station. The raw materials for preparing the modifier in this invention are simple and readily available. Furthermore, the calcium aluminate pre-melted slag, a low-nitrogen aluminum ash, and the industrial cryolite used are both solid wastes from aluminum plants, which helps to reduce the pressure on metallurgical solid waste recycling. The slag conditioning process is virtually dust-free, improving dust problems and enhancing environmental friendliness.