33 results about "Electrolytic iron" patented technology

The invention discloses a preparation method of low-loss high-saturation iron-nickel soft magnetic powder. Comprising the following steps of S1, alloy smelting and S2, atomization. S3, carrying out ball milling treatment; s4, annealing treatment; s5, carrying out surface coating; the low-loss high-saturation iron-nickel soft magnetic powder is prepared from the following raw materials in percentage by weight: 77.6%-78.2% of electrolytic nickel, 21.4%-22.3% of electrolytic iron and 0.1%-1% of an additive, the performance of the iron-nickel soft magnetic powder and a magnetic powder core prepared by the process is improved in multiple aspects, and the iron-nickel soft magnetic powder has great application advantages.

The invention discloses a polyolefin composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, the polyolefin composite material comprises the following components in parts by weight: 18-32 parts of polyolefin resin, 19-31 parts of vinyl coupling agent modified metal powder, 19-31 parts of a nitrogen-phosphorus flame retardant, 4.5-11 parts of graphite and 0.9-5.2 parts of an interface improver; the vinyl coupling agent modified metal powder comprises a vinyl coupling agent and metal powder, and the metal powder comprises at least one of carbonyl iron powder, reduced iron powder, electrolytic iron powder and iron-based alloy powder. Under the combined action of the polyolefin resin, the vinyl coupling agent modified metal powder, the nitrogen-phosphorus flame retardant, the graphite and the interface improving agent, excellent electromagnetic shielding performance and flame retardant performance are obtained, and the polyolefin material is suitable for preparing electronic components, especially suitable for preparing electric control boxes, such as high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials and the like. The invention discloses a lithium battery pack and an electronic appliance protection shell.

The invention relates to a process for preparing pure iron by using red mud, which is characterized in that the red mud is Bayer process red mud, i.e., solid waste residue formed by solid-liquid separation after aluminum oxide is dissolved out from bauxite through high temperature, high pressure and strong alkali in the process of producing aluminum oxide by adopting a Bayer process, so that the environmental burden caused by the Bayer process red mud can be solved; the method is beneficial for reducing carbon emission in the aspect of iron element extraction and promoting development of a green metallurgical technology, and is characterized by comprising the following steps: taking Bayer process red mud as a raw material, carrying out acid leaching on the Bayer process red mud to obtain a ferrous oxalate extract, calcining the ferrous oxalate to obtain iron oxide, and recycling the iron oxide. And dissolving the ferric oxide into a sulfuric acid solution to obtain a ferric sulfate solution, taking the ferric sulfate solution as an electrolyte in an electrolysis device, and obtaining electrolytic iron through the electrolysis device, so that the pure iron is prepared from the red mud.

A preparation method of the steel slag-based binder comprises the following steps: crushing converter steel slag, grinding to 150 meshes or below to obtain converter steel slag fine powder, removing iron, continuously grinding to 300-350 meshes, and removing iron again until the metal iron content is less than or equal to 0.5 wt% to obtain active steel slag powder; fly ash and water are mixed and then settled, bottom sediment is taken and dried till the water content is smaller than or equal to 3 wt%, and pretreated fly ash is obtained; and mixing the active steel slag powder, the pretreated fly ash, pyrophyllite and wollastonite according to a certain ratio, and uniformly grinding to obtain the steel slag-based binder for preparing the micro-electrolysis iron-carbon spheres. The method not only solves the problem of recycling of steel slag resources, but also can prepare the iron-carbon micro-electrolysis filler with low production cost, so that the cost is remarkably reduced.

The invention belongs to the technical field of waste resource treatment and recovery, and provides a hematite type waste residue treatment method which comprises the steps that hematite type waste residues are sequentially pulpified and washed, and washed residues are obtained; the washing slag is leached, and a leaching solution is obtained; mixing the leachate with iron powder and sulfur, and carrying out reduction reaction to obtain reduced liquid and reducing slag; mixing the reduced liquid with a precipitant, and carrying out an aluminum precipitation reaction to obtain a purified liquid and aluminum slag; and the purified liquid is electrolyzed, and the electrolytic iron powder is obtained. According to the method, the waste residues are subjected to acid dissolution through the hydrometallurgy technology and then are prepared into the electrolytic iron powder through the electrolysis technology, iron and impurities such as aluminum and silicon can be fully separated, a high-value iron powder product is obtained, meanwhile, the impurities can be further fully utilized, and by-products of nickel and aluminum are obtained.

The invention relates to the technical field of pure iron preparation through aqueous solution electrolysis, in particular to a method for inhibiting colloid generation in pure iron preparation through FeSO4 solution electrolysis. In the electrolytic bath, a cathode chamber and an anode chamber are separated by using an anion exchange membrane; the anolyte is a Na2SO4 or K2SO4 solution, the catholyte comprises a FeSO4 solution and a reducing agent, and the concentration of SO4 < 2-> in the catholyte is the same as that of SO4 < 2-> in the anolyte. According to the method, the surface roughening phenomenon of a cathode deposition layer is effectively inhibited, the risk of hydrogen embrittlement of pure iron caused by excessive precipitation of hydrogen is avoided, the attenuation rate of current efficiency is remarkably reduced, and therefore synchronous improvement of electrolytic iron product quality, electrolytic efficiency and process stability is achieved; the method has important significance for promoting the development of a pure iron preparation technology by an aqueous solution electrolysis method.

The utility model discloses a diaphragm system for electrolytic iron, electrolytic zinc or electrodeposited nickel, which belongs to the technical field of electrolytic equipment and comprises a cathode frame and an anode frame which are arranged in parallel, the anode frame is detachably mounted on the cathode frame, a diaphragm bag is sleeved outside the anode frame, a first through groove is arranged on the anode frame, and the diaphragm bag covers the through groove; first connecting blocks are arranged at the two ends of the lower end of the cathode frame, and when the anode frame is installed on the cathode frame, the lower end of the anode frame makes contact with the upper ends of the first connecting blocks. The anode frame is detachably mounted on the cathode frame, so that the anode frame needing to be replaced can be conveniently and quickly taken out from the cathode frame, and the diaphragm system can be quickly disassembled, assembled, maintained and cleaned; the first connecting block is in contact with the lower end of the anode frame, and anolyte flows out of the anode frame through the first through groove; the cathode frame disclosed by the utility model is simple in structure and low in production cost; and the production and use of electrolytic iron, electrolytic zinc or electrodeposited nickel can be met.

The invention belongs to the technical field of iron-silicon-aluminum magnetic materials, and provides a method for preparing an iron-silicon-aluminum magnetic powder core by using silicon steel waste, which comprises the following steps: powder preparation, proportioning, coating, granulation, pressing and annealing. According to the method, the silicon steel waste serves as the raw material, the silicon steel waste, the silicon iron, the aluminum ingot, the ferrophosphorus and the electrolytic iron are placed in the vacuum induction furnace to be smelted and then prepared into powder, the prepared iron-silicon-aluminum powder is coated, granulated, pressed and annealed to obtain the iron-silicon-aluminum magnetic powder core, high-value utilization of the silicon steel waste is achieved, the raw material cost is remarkably reduced, and environmental protection and energy saving are achieved.

The invention belongs to the technical field of metal purification and preparation, and particularly relates to a method for preparing high-purity iron through magnetized electrolyte assisted electrolysis. The method comprises the following steps: 1) obtaining a hydrated ferrous salt solution as an electrolyte; 2) removing impurities from the electrolyte obtained in the step 1); (3) magnetizing the electrolyte subjected to impurity removal; and (4) the magnetized electrolyte obtained in the step (3) is placed in an electrolysis device to be electrolyzed, pure iron with the purity larger than or equal to 99.9% is obtained on a cathode, and in the electrolysis device, the anode material is pure iron with the purity larger than or equal to 99%. According to the invention, the electrolyte is magnetized in a uniform magnetic field, and the magnetized electrolyte is electrolyzed. In the electrolysis process, the deposition rate of the electrolytic iron on the cathode plate is increased, the energy consumption in the electrolysis process is reduced, and meanwhile, the integrity of the electrolytic iron on the cathode plate is also improved.

The invention discloses a wear-resistant steel-based mold material for plastic magnetic injection molding and a preparation method of the wear-resistant steel-based mold material, and relates to the technical field of mold steel materials. When the steel-based mold material is prepared, metal chromium, titanium powder, ferromolybdenum, graphite, ferroboron, lanthanum iron and electrolytic iron are weighed according to a specific proportion, and a cast ingot is obtained through vacuum induction melting and argon protection pouring; a calcium fluoride-aluminum oxide-calcium oxide mixed slag system serves as a remelting medium, electroslag remelting, homogenization treatment and oil quenching are conducted on the cast ingot, and a steel ingot is obtained; the steel ingot is subjected to multidirectional forging and temperature-controlled cooling, and forged die steel is obtained; and finally, the forging die steel is subjected to gas nitriding subzero treatment and multi-stage tempering, gradient titanium nitride and chromium nitride metal ceramic layers are induced to be formed on the surface, and the wear-resistant steel-based die material for plastic magnetic injection molding is prepared. The prepared steel-based mold material has high hardness, high wear resistance and corrosion resistance.

The invention provides a method for preparing electrolytic iron powder from laterite-nickel ore hydrometallurgy tailings. The method comprises the following steps: carrying out deep acid leaching treatment on the laterite-nickel ore hydrometallurgy tailings, and carrying out solid-liquid separation to obtain leachate and acid leaching residues; mixing the leachate with a reducing agent to carry out reduction reaction, adjusting the pH value of the leachate to carry out aluminum and chromium removal reaction, and adding sodium sulfide into a solution obtained by the aluminum and chromium removal reaction to carry out nickel removal reaction, so as to obtain impurity-removed liquid; and electrodeposition treatment is conducted on the liquid obtained after impurity removal, a cathode is stripped after electrodeposition treatment, the cathode is crushed and then subjected to annealing reduction treatment, and the electrolytic iron powder is obtained. According to the method, through the acid leaching-impurity removal-electrodeposition-annealing reduction process, the difficulty of sulfur in the iron ore concentrate process and the interference of chromium in smelting reduction are avoided, the high-purity electrolytic iron powder can be obtained under the condition of low energy consumption, and high-value recycling of iron resources in the laterite-nickel ore hydrometallurgy process is achieved.

[Subject] The purpose of the present invention is to provide an electrolytic foil and a collector for a battery, which can suppress the cracking and breaking during manufacturing that are worried about with thin filming, and further have sufficient strength and elongation during repeated charge and discharge in a secondary battery. [Solution] An electrolytic iron foil characterized by having a thickness of less than 20 μm, having a first surface and a second surface, and in both the first surface and the second surface, the value obtained by dividing the three-dimensional surface property parameter Sv by the thickness is less than 0.27.

The invention belongs to the field of energy and metallurgy. Specifically, the invention discloses an electrolytic iron system based on multi-energy coupling and a surface topography multi-scale control method. A nano-micro-scale special surface microstructure is constructed on the cathode seed plate through a combined process of laser engraving, sand blasting treatment, anodic dissolution and photovoltaic current pre-coating. And meanwhile, magnetic field ultrasonic microwave multi-physical field enhanced ore phase reconstruction, acidolysis, anodic dissolution, photovoltaic current pre-coating, iron electrolysis and other procedures are adopted, and the reaction performance is improved. In the multi-scale control process of the surface appearance of the electrolytic iron, a multi-energy coupled clean energy supply system is adopted. According to the method, the non-uniform deposition problems such as cracking, blackening and dendritic crystals in the iron electrolysis process can be remarkably inhibited, and the current efficiency and the production stability are improved. The method is suitable for surface morphology regulation and control of pure iron prepared through large-scale continuous iron ore electrolysis, and has the advantages of being high in efficiency, low in energy consumption, free of pollution, ultralow in carbon dioxide emission and the like.

The invention discloses a preparation method of an anti-corrosion and wear-resistant composite coating for electrical pure iron, which comprises the following steps: (1) carrying out mirror polishing treatment on an electrical pure iron workpiece, respectively carrying out ultrasonic cleaning on polished electrical pure iron by using petroleum ether and absolute ethyl alcohol, and then carrying out blow-drying treatment; (2) putting the electrician pure iron workpiece into a preheating furnace for preheating, and then putting the electrician pure iron workpiece into a nitriding furnace for nitriding treatment; (3) polishing the nitrided electrical pure iron by adopting a vibration polishing machine; and (4) the CrAlSiN coating is prepared on the surface of the nitrided and vibration-polished electrical pure iron through magnetron sputtering. By combining salt bath nitriding and magnetron sputtering of the CrAlSiN coating, the salt spray corrosion resistance time of the electrical pure iron is obviously prolonged, the wear resistance of the pure iron is effectively improved, and the problem that the electrical pure iron is insufficient in corrosion resistance and wear resistance in some extreme environments is solved.

The invention discloses a large-particle magnetic grinding material for group hole polishing and a preparation method thereof. The magnetic grinding material is characterized by comprising a ferromagnetic phase matrix, grinding phase particles, a magnetic plating layer and an electroplating consolidation layer, the component of the ferromagnetic phase matrix is electrolytic iron powder; the grinding phase particles are one of three kinds of superhard particles including diamond, silicon carbide and boron nitride; the magnetic coating is a metal coating formed by chemical deposition of one of nickel, cobalt, iron and alloys of nickel, cobalt, iron and the alloys of nickel, cobalt, iron and the alloys of nickel, cobalt and iron and wraps the surfaces of grinding phase particles, and magnetic responsiveness and conductivity are improved; the electroplating consolidation layer is an electrolytic metal deposition layer of one of nickel, cobalt, iron, copper and alloys of nickel, cobalt, iron, copper and alloys of nickel, cobalt, iron, copper and alloys of nickel, cobalt, iron, copper and alloys of nickel, cobalt, iron, copper and alloys of nickel, cobalt, iron and copper; the magnetic grinding material is an aggregate large-particle grinding material and has high self-adaptability to polishing of group holes with complex shapes, the problem that a single-particle grinding material is stuck or sinks inwards is solved, and the material removal rate and the machining stability are improved.

The invention belongs to the technical field of electrolytic metallurgy, and particularly relates to a method and device for manufacturing iron through magnetic field assisted low-temperature electrolysis, and the method comprises the following steps: taking a suspension of iron oxide-containing mineral powder and a strong alkaline solution as an electrolyte, inserting an anode and a cathode into the electrolyte to construct an electrolysis system, then respectively connecting the anode to a power supply anode, and connecting the cathode to a power supply cathode; connecting the cathode to the negative electrode of the power supply; applying a magnetic field to the electrolysis system and electrifying for electrolysis; and after electrolysis is completed, the cathode is taken out, washed and dried, and then a pure iron product generated on the surface of the cathode is stripped. Compared with the prior art, the method solves the problems of complex steps, low current efficiency and difficulty in product separation due to the fact that a specially prepared iron oxide cathode is needed in low-temperature alkaline electrolysis iron preparation in the prior art. According to the scheme, the suspension of the iron-containing oxide mineral powder and the strong alkaline solution serves as the electrolyte, the current efficiency of electrolytic iron manufacturing is obviously improved by applying the magnetic field, and zero-carbon-emission and efficient short-process preparation of pure iron is achieved.

The invention provides an electrolytic iron foil and application thereof. The electrolytic iron foil comprises an iron base material and a surface layer formed on at least one surface of the iron base material; the surface layer comprises metal elements and non-metal elements, the metal elements comprise non-ferrous metal elements, the non-ferrous metal elements comprise at least one of nickel, copper, manganese, cobalt and molybdenum, and the non-metal elements comprise at least one of phosphorus and boron; in terms of 100 wt% of all metals contained in the electrolytic iron foil, the content of non-ferrous metal elements in the electrolytic iron foil is greater than 0 and 5 wt% or less. The electrolytic iron foil has high-strength tensile resistance, and when the electrolytic iron foil is used for an energy storage device, the prepared electrode has excellent flexibility, lithium dendrites can be inhibited, the interface resistance between an electrode mixture layer and the electrolytic iron foil can be reduced, and the energy storage device can exert excellent low-temperature output characteristics.

Topic: The purpose of the present invention is to provide an electrolytic foil and a collector for a battery, which can suppress the cracking and breaking during manufacturing that are worried about with thin filming, and further have sufficient elongation, strength and thinness during repeated charge and discharge in a secondary battery. Solution: Electrolytic iron foil, characterized in that, in at least any one surface, the crystallite diameter of the iron (110) plane is 45nm or more and the thickness is less than 20μm.

The present invention provides a contact plasma therapeutic apparatus, comprising: an electrode and magnet module, connected to a housing through a flexible connection, the electrode and magnet module including an upper electrode and magnet part and a lower magnet part near the skin end; the upper electrode and magnet part successively includes a first permanent magnet, a first electrolytic iron, and an insulating dielectric layer; the lower magnet part near the skin end includes a second electrolytic iron and a second permanent magnet, fixed by an insulating cap of the outer housing; the first electrolytic iron and the hollow spherical electrode are electrically connected by a thread; the insulating dielectric layer has uniform micropores along the Z direction; the insulating dielectric layer is divided into upper and lower layers, and the two layers of dielectric are installed with a gap to form a micro-air gap; the first permanent magnet is magnetized in the vertical direction to generate a steady magnetic field in the Z-axis direction, which is used to confine electrons and form a micro-discharge channel to enhance the magnetic field effect; air is pumped by a micro air pump so that the air pressure in the micro-air gap of the insulating dielectric is lower than the atmospheric pressure, and the discharge electric field intensity is enhanced by stepwise breakdown.

To provide a method for producing electrolytic iron foil having high purity and excellent in smoothness and flexibility.SOLUTION: The method for producing an electrolytic iron foil includes a step of forming an electrolytic iron foil F on the surface of a cathode drum 1 by using the cathode drum 1 rotating in a state of being at least partially immersed in an electrolytic solution 3 and an anode 2 arranged so as to face the cathode drum 1 in the electrolytic solution 3 and passing an electric current through the cathode drum 1 and the anode 2. The temperature of the electrolytic solution 3 is 50 to 90 °C, the content of Fe2 + in the electrolytic solution 3 is 40 to 200g / L, the pH of the electrolytic solution 3 is 2.0 to 4.0, and the density of the current is 50 to 500A / m2.SELECTED DRAWING: Figure 1

The invention discloses a method and a system for co-producing high-purity iron through a Bayer process and high-purity iron powder, and belongs to the field of metallurgical recycling and green chemical engineering. According to the method, residual alkali liquor and process waste heat in the Bayer process red mud are utilized, the ultrasonic cavitation effect is cooperated with sodium thiosulfate to serve as a Fe < 3 + > stabilizer, iron oxide in the red mud is selectively dissolved at the temperature of 80-100 DEG C, and meanwhile dissolution of Al2O3 is inhibited. And filtering the dissolved iron alkali liquor through a ceramic membrane, complexing and purifying the iron alkali liquor through EDTA (Ethylene Diamine Tetraacetic Acid), introducing the iron alkali liquor into a diaphragm electrolytic cell, directly electrolyzing to generate Fe (OH) 2 under the conditions that the pH is 10-11 and the current density is 3000-5000 A / m, and dehydrating and reducing to obtain iron powder with the purity of more than or equal to 99.5%. And the electrolytic residual liquid is returned to a reaction process after alkali is supplemented, and filter residues are recycled to a Bayer process dissolution section, so that full circulation of resources is realized. According to the method, the technical bottlenecks of high acid consumption and alkaline electrolytic iron of a traditional acid leaching method are broken through, and the energy consumption per ton of iron is only 2100 kWh and is reduced by 38% compared with that of a traditional process.

This invention relates to a method for extracting iron from red mud using microwave biomass reduction-sulfuric acid leaching-electrolytic deposition, belonging to the field of resource comprehensive utilization and hydrometallurgical technology. The method first involves uniformly mixing red mud with a biomass reducing agent, then using a microwave field for rapid and efficient reduction, converting the sparingly soluble iron oxides in the red mud into readily soluble elemental iron or low-valence iron oxides. The reduction product is then leached with sulfuric acid, allowing the iron to enter the solution and separate from most impurities. Finally, the iron-rich leachate is electrolytically deposited to directly obtain high-purity electrolytic iron. This invention utilizes the selectivity and holistic nature of microwave heating, coupled with the green and renewable characteristics of the biomass reducing agent, to achieve efficient, energy-saving, and environmentally friendly recovery of iron from red mud. The process is short, energy-efficient, and has significant industrial application prospects.

The invention is applicable to the technical field of metal powder material preparation, and provides high-strength wear-resistant alloy powder for additive manufacturing and a preparation method thereof, the high-strength wear-resistant alloy powder for additive manufacturing comprises the following matrix components in percentage by mass: a mixed matrix comprising electrolytic iron and reduced iron powder, a wear-resistant phase strengthening element, a tough phase element and a functional modifier, the surface of the carbon nanotube is modified by a silane coupling agent KH550; through a three-dimensional cooperation strategy of component gradient regulation and control, tissue densification design and nano-enhanced network construction, breakthrough improvement of alloy performance is achieved, a high-hardness-high-toughness gradient structure is formed by a wear-resistant phase and a toughness phase which are precisely proportioned, and chemical bonding of the surface modified carbon nanotubes and a matrix is combined, so that the wear resistance and toughness of the alloy are improved, and the wear resistance and toughness of the alloy are improved. Constructing a three-dimensional enhanced network for inhibiting defect expansion on a micro scale; and crack initiation and expansion are inhibited through a nanometer enhanced network, and a powder material with high reliability and high performance is provided for additive manufacturing.

This invention discloses a method for preparing high-frequency, low-loss Fe-Ni-Mo permalloy powder using an atomization and heat treatment process, relating to the field of soft magnetic functional materials technology. The invention includes the following steps: first, electrolytic iron, electrolytic nickel, molybdenum plate, ferroboron, silicon, and sponge yttrium are smelted to obtain an alloy liquid; then, the alloy liquid is atomized and solidified to form powder; the resulting atomized powder is cleaned and treated in an argon atmosphere at 600-620℃ for 30-40 minutes; subsequently, it is coated with Y-Al-F-O sol, followed by silica coating; finally, it is treated in an argon atmosphere at 380℃ for 30-40 minutes, and after sieving, high-frequency, low-loss Fe-Ni-Mo permalloy powder is obtained. This preparation method effectively improves the insulation resistance, high-frequency low-loss capability, and frequency stability of the permeability of the Fe-Ni-Mo permalloy powder.

An electrochemical reactor system includes: an electrochemical cell, having: an anode; a cathode; an electrolyte stream including an electrolyte and an iron-containing feedstock containing feedstock particles; and a channel that contains the electrolyte stream; and a magnetic field source positioned to provide a magnetic field at the surface of the cathode. The electrochemical cell electrochemically reduces the iron-containing feedstock to form iron particles at a surface of the cathode and in the magnetic field. The feedstock particles have an average particle size in at least one dimension of 10 micrometers or less, and the iron particles have an average particle size in at least one dimension of 50 to 1,000 micrometers, or the feedstock particles have an average particle size in at least one dimension of 25 micrometers or greater, and the iron particles have an average particle size in at least one dimension of 0.1 to 20 micrometers.

The present invention discloses a polyolefin composite material, its preparation method, and application, belonging to the field of polymer materials technology. The polyolefin composite material comprises the following components in parts by weight: 18-32 parts of polyolefin resin, 19-31 parts of vinyl coupling agent-modified metal powder, 19-31 parts of nitrogen-phosphorus flame retardant, 4.5-11 parts of graphite, and 0.9-5.2 parts of an interface modifier. The vinyl coupling agent-modified metal powder comprises a vinyl coupling agent and a metal powder, wherein the metal powder comprises at least one of carbonyl iron powder, reduced iron powder, electrolytic iron powder, and iron-based alloy powder. The polyolefin resin, vinyl coupling agent-modified metal powder, nitrogen-phosphorus flame retardant, graphite, and interface modifier work together to produce a composite material having excellent electromagnetic shielding and flame retardant properties. The polyolefin material is suitable for the preparation of electronic components, particularly electrical control boxes, lithium battery packs, and protective housings for electronic appliances.

The invention provides a microwave preheating mineral powder-molten salt electrolysis ironmaking co-production system and a co-production method, and relates to the technical field of green low-carbon ironmaking systems and methods. The system comprises a feeding unit, a microwave preheating device, a molten salt electrolytic bath, a product treatment device and a gas circulation unit which are sequentially connected through a pipeline. The microwave preheating device is provided with a reducing gas inlet, preheated mineral powder is directly fed into a molten salt electrolytic bath, direct current is introduced into a molten salt medium for electrolysis, metal iron liquid is obtained at a cathode, and a gas product is separated out at an anode; and anode gas generated by electrolysis and tail gas generated by preheating are purified and separated by the gas circulating unit and then are recycled. According to the method, the high efficiency of microwave preheating and the greenness of molten salt electrolysis are combined, so that the energy consumption is obviously reduced, the method is green and low-carbon, the process is short, the production efficiency is high, the raw material adaptability is wide, high-value products are co-produced, and industrial large-scale production, popularization and application are facilitated.

This invention belongs to the technical field of iron-silicon-aluminum magnetic materials and provides a method for preparing iron-silicon-aluminum magnetic powder cores using silicon steel waste. The method includes the following steps: powder preparation, proportioning, coating, granulation, pressing, and annealing. This invention uses silicon steel waste as raw material, which is smelted with ferrosilicon, aluminum ingots, ferrophosphorus, and electrolytic iron in a vacuum induction furnace and then powdered. The resulting iron-silicon-aluminum powder is then coated, granulated, pressed, and annealed to obtain the iron-silicon-aluminum magnetic powder core. This method achieves high-value utilization of silicon steel waste, significantly reduces raw material costs, and is environmentally friendly and energy-saving.

The invention relates to the technical field of electrolytic metallurgy, in particular to a method for preparing pure iron through acid solution electrolysis. Comprising the following steps: separating a cathode chamber from an anode chamber by using a diaphragm in an electrolytic cell; the electrolyte of the anode chamber is a Na2SO4 or K2SO4 solution; the electrolyte in the cathode chamber is a mixed solution of FeSO4 and Na2SO4 or K2SO4, wherein the amount of substance of Na2SO4 or K2SO4 is 30%-50% of the amount of substance of FeSO4; and the pH of the electrolyte in the cathode chamber and the pH of the electrolyte in the anode chamber are the same and are both 2.5-4. According to the method, a proper amount of Na2SO4 or K2SO4 is added into the electrolyte in the cathode chamber, the conductivity of the electrolyte is maintained, the electrolytic efficiency is improved, meanwhile, the nanoscale iron powder is adopted for adjusting the pH of the electrolyte in the cathode chamber, Fe (OH) 3 colloid is prevented from being generated, the surface flatness of electrolytic iron is guaranteed, and therefore the quality, efficiency and purity of pure iron preparation are effectively improved.

A method and system for the recovery of rare earth elements, cobalt, and electrolytic iron from magnets. The system can include an electrochemical cell assembly configured to dissolve the magnets in an acid solution. The system can also include a filtration unit operatively connected to the electrochemical cell assembly for removing impurities from the dissolved magnet solution. The system can also include a precipitation unit operatively connected to the filtration unit. The system can also include an electrowinning cell operatively connected to the precipitation unit. The system can also include a recycling unit for regenerating sulfuric acid from the process effluent, operatively connected to the electrowinning cell.