189 results about "Elemental iron" patented technology

The invention belongs to the technical field of metallurgical engineering, and discloses a red mud and arsenic-containing hazardous waste collaborative resource utilization method which comprises the following steps: pretreating red mud by adopting roasting and magnetic separation processes, mixing the pretreated red mud with sodium carbonate, a reducing agent and non-ferrous smelting arsenic removal slag, and carrying out reduction smelting to obtain arsenic-iron alloy and sodium carbonate slag; the arsenic-iron alloy can be used as a counterweight material; the furnace slag can be reused as an arsenic removal agent. According to the method, the red mud is pretreated through roasting and magnetic separation, the valuable element iron is enriched from the red mud in a high-selectivity mode and cooperates with the colored arsenic-removed slag to carry out reduction smelting, the harmful element arsenic is converted into a novel material, synergistic resource utilization of the red mud and the arsenic-containing hazardous waste is achieved by using waste to treat waste, and the method has great significance.

The invention provides a method for preparing an iron-chromium electrolyte and electronic-grade ferrous chloride by using a stainless steel waste liquid. The method comprises the following steps: firstly, adding elemental iron and / or elemental chromium into the stainless steel waste liquid to obtain a chromium-containing ferrous chloride solution; then, sulfide is added, and nickel is removed; adding iron powder to increase the pH value to obtain chromium hydroxide precipitate and a ferrous chloride solution; dissolving chromic hydroxide in hydrochloric acid to obtain a chromic chloride solution; purifying the ferrous chloride solution to obtain an electronic-grade ferrous chloride crystal; and finally, adding a chromium chloride solution, the electronic-grade ferrous chloride crystal and hydrochloric acid according to a certain proportion, and stirring and mixing to obtain the iron-chromium electrolyte. The ferrous chloride prepared by the steps is relatively high in purity and less in waste; meanwhile, the prepared electrolyte is good in electrical property, low in attenuation rate and low in cost, the purpose of comprehensive recycling of resources is achieved, and the general trend of technical improvement is met.

The invention discloses ferric sodium pyrophosphate, a preparation method, a positive pole piece and a sodium ion battery, and belongs to the technical field of secondary batteries. The preparation method comprises the following steps: S1, mixing a phosphorus element, an iron element, a sodium element and a carbon element in a phosphorus source, an iron source, a sodium source and a carbon source according to a molar ratio of (1-5): (1-3): (1-5): (0.1-0.5); adding a dispersing agent and an organic solvent; s2, carrying out ball milling on the mixture obtained in the step S1; s3, carrying out vacuum drying on the mixture subjected to ball milling; and S4, sintering the material treated in the step S3 to obtain the ferric sodium pyrophosphate. The preparation method of the ferric sodium pyrophosphate comprises the following steps: uniformly mixing a phosphorus source, an iron source, a sodium source and a carbon source through ball milling, and sintering to obtain the ferric sodium pyrophosphate. The ferric sodium pyrophosphate is prepared by adopting a solid phase method, the preparation steps are simple, and large-scale production is easier.

The invention discloses a slow-release phosphate fertilizer as well as a preparation method and application thereof. Iron-phosphorus compound fertilizer is prepared by generating an iron oxide coating on the surface of the phosphate fertilizer through iron mineral precipitation. Wherein the iron oxide coating can prevent the phosphate fertilizer from absorbing moisture, reduce volatilization loss of phosphorus and realize controlled release of the phosphate fertilizer, the problems of phosphate fertilizer failure and excessive phosphorus loss are solved, and in addition, the coated iron ore used for synthesizing the compound fertilizer can supplement trace element iron in soil after being dissolved, so that the nutrition of the soil is improved. The invention further provides application of the slow-release phosphate fertilizer, along with dynamic changes of soil environment humidity and oxidation-reduction conditions, ferrous oxidation mineralization and phosphorus dissolution release on the surface of the controlled-release fertilizer have high controllability, the anaerobic-aerobic environment on the surface of the compound fertilizer can be changed through flooding-drainage, and the controlled-release intelligent phosphate fertilizer is formed; the controlled-release fertilizer is driven by water, the form change of iron in different environments is taken as a switch, the application method is simple, no influence is caused to the environment, and the controlled-release fertilizer is suitable for large-scale agricultural operation.

The invention relates to a preparation method of simulated lunar soil suitable for resource utilization, which comprises the following steps: S1, crushing a basalt sample and carrying out primary magnetic separation to obtain a primary magnetic separation sample; s2, the primary magnetic separation sample is ground, the ground primary magnetic separation sample is subjected to a heating hydrogen reduction reaction, and a hydrogen reduction product is obtained; s3, carrying out secondary magnetic separation on the hydrogen reduction product, and drying the iron-removed sample to obtain a secondary magnetic separation sample for later use; s4, the ilmenite powder and reducing gas are mixed to react, an ilmenite mixture containing elemental iron is obtained, and then the ilmenite mixture is sintered and smashed to obtain ilmenite particles; s5, mixing the secondary magnetic separation sample obtained in the step S4 and the ilmenite particles obtained in the step S5 according to a preset mass ratio, performing tabletting treatment, and sintering in an inert atmosphere to obtain a mixed sintering sample; and S6, crushing the mixed sintering sample to obtain the simulated lunar soil particles. The simulated lunar soil conforms to the actual symbiotic combination rule of lunar soil minerals.

The invention discloses a preparation method of an iron-aluminum porous material, which specifically comprises the following steps: S1, selecting element iron powder, element aluminum powder and anhydrous magnesium carbonate powder as original powder, then mixing in a vacuum mixing tank, and finally carrying out compression molding on the uniformly mixed ternary powder; s2, a pressed blank formed through pressing is put into a tubular furnace for vacuum sintering, firstly, the temperature is increased to 500-600 DEG C at the speed of 5-10 DEG C / min, and heat preservation is conducted for 2 h; a large number of vacancies are formed around the aluminum particles at the stage, and pores are formed by aggregation of the vacancies; anhydrous magnesium carbonate can be heated and decomposed at 500 DEG C, and the porosity is further increased; s3, the temperature is continuously increased to 660-700 DEG C at the temperature increasing speed of 1-2 DEG C / min, heat preservation is conducted for 1 h, the positions originally occupied by the aluminum particles are all changed into pores in the stage, and the porosity is further improved; and S4, continuing to heat to 950-1100 DEG C at the heating rate of 5-10 DEG C / min and keeping the temperature for 2 hours, increasing the porosity through further diffusion / reaction between iron and aluminum, and completing high-temperature phase change at the same time to realize component homogenization.

The present invention provides a method for preparing iron phosphate from ferrophosphorus slag. The method comprises the following steps: (1) pretreating ferrophosphorus slag to obtain a mixture containing aluminum phosphate; (2) mixing the mixture with chloride, roasting to obtain roasted slag, after washing and filtering, mixing the roasted slag with an acid solution, and after reaction, performing solid-liquid separation to obtain a solution A; (3) mixing the solution A with elemental iron, after reaction, carrying out solid-liquid separation to obtain a solution B, and adding an iron source and / or a phosphorus source to adjust a molar ratio of phosphorus to iron to obtain a raw material solution; and (4) mixing the raw material solution with hydrogen peroxide, adjusting the pH value for reaction, carrying out solid-liquid separation to obtain iron phosphate dihydrate, and carrying out sintering treatment to obtain iron phosphate. The method of the present invention can realize deep removal of Al and Cu impurities, thereby preparing high-purity iron phosphate; and the method has a simple process and relatively low costs.

The present invention relates to a crop nutrition and fortifying composition comprising an effective amount of the following ingredients: elemental sulfur; one or more magnesium salt derivatives or mixtures thereof; one or more potash fertilizers or salts or derivatives or mixtures thereof; one or more iron salts or derivatives or mixtures thereof; one or more zinc salts or derivatives or mixtures thereof; and one or more excipients. The composition comprises particles having a particle size ranging from 0.1 to 50 [mu] m wherein the elemental sulfur content is from 5% to 90% by weight; the content of the element magnesium is 0.1%-40% (weight percentage); the content of the element potassium is 0.1%-40% (weight percentage); the content of the element iron is 0.1%-45% (weight percentage); and the content of the element zinc is 0.1-45% of the total weight of the composition. The invention also relates to a method for preparing the crop nutrition and fortifying composition, and a method for treating a plant, a seed, a crop, plant propagation material, a locus, parts thereof or soil using the crop nutrition and fortifying composition.

The invention relates to a crop nutrition and fortification composition comprising: elemental sulphur in a range of 1% to 90% by weight; one or more water insoluble or water soluble iron salts or derivatives or mixtures thereof, wherein elemental iron content is in the range of 0.1% to 50% by weight; one or more water insoluble or water soluble zinc salts or derivatives or mixtures thereof, wherein elemental zinc content is in the range of 0.1% to 55% by weight; one or more water insoluble or water soluble magnesium salts or derivatives or mixtures thereof, wherein elemental Magnesium content is in the range of 0.5% to 50% by weight; one or more water insoluble or water soluble boron salts or derivatives or mixtures thereof, wherein elemental boron content is in the range of 0.01% to 25% by weight; one or more water insoluble or water soluble manganese salts or derivatives or mixtures thereof, wherein elemental manganese content is in the range of 0.1% to 40% by weight; one or more water insoluble or water soluble copper salts or derivatives or mixtures thereof, wherein elemental copper content is in the range of 0.1% to 40% by weight; and, one or more surfactants in the range of 0.1 to 40% by weight. The composition is in the form of water dispersible granules and liquid suspension, wherein the compositions have a particle size of range of 100 nanometers to 5 microns and has an average particle size diameter distribution of less than 1000 nanometers and wherein the total content of the water soluble salts, derivatives or mixtures in the composition does not exceed 80% by the weight of the total composition. The invention also relates to a process of preparing the crop nutrition and fortification composition and to a method of treating the plants, seeds, crops, plant propagation material, locus, or parts thereof or soil with the crop nutrition and fortification composition.

The invention discloses a vanadium iron-site doped iron phosphate material and a preparation method, and relates to the technical field of lithium ion battery positive electrode material preparation, pure water is used as a base solution, and a vanadium salt solution with the pH value of 2.0-3.0, a ferrite solution with the pH value of 1.0-2.5 and a phosphorus-oxygen mixed solution with the pH value of 5.0-7.0 are simultaneously added into a reaction kettle in a three-strand parallel flow mode for a co-precipitation reaction. By controlling the acid environment of a key solution system, reduction of metavanadate radicals or generation of ferric vanadate precipitates is effectively inhibited, and vanadium elements are successfully and uniformly doped to iron sites of iron phosphate crystal lattices; the mass ratio of iron to phosphorus in the obtained iron phosphate material is stabilized at 95-98%, the doping amount of vanadium is 100-10000 ppm, and the vanadium is uniformly distributed. Lithium iron phosphate prepared by taking the material as a precursor has higher discharge capacity and compaction density, and the electrochemical performance of a lithium ion battery is remarkably improved.

The invention discloses a method for preparing a battery-grade ferrous dihydrogen phosphate solution through co-impregnation of ferrophosphorus slag and siderite and recovering copper / graphite. The method comprises the following steps: carrying out reduction leaching on raw materials including ferrophosphorus slag, siderite and elemental iron by taking phosphoric acid as a leaching agent, and carrying out solid-liquid separation to obtain a battery-grade ferrous dihydrogen phosphate solution and leaching slag; and the leached residues are subjected to size mixing and then subjected to graphite flotation separation, and copper-rich tailings and graphite concentrate are obtained. According to the method, through the synergistic effect of the ferrophosphorus slag and the siderite, phosphoric acid with weak acidity is adopted as the leaching agent, valuable components in the ferrophosphorus slag and the siderite can be selectively recycled, the battery-grade ferrous dihydrogen phosphate liquid can be obtained, meanwhile, graphite and copper components in the battery-grade ferrous dihydrogen phosphate liquid can be efficiently recycled, the process is simple, the cost is low, and the method is suitable for industrial production.

The invention discloses a preparation method of high-purity phenolic resin carbon microspheres, and belongs to the technical field of battery materials, the preparation method mainly comprises the steps of purification, polymerization, separation, drying and carbonization of raw materials, the resin carbon microspheres obtained through the method are large in density, high in purity and good in strength, the ash content is smaller than 0.01%, the total content of microelements (iron, cobalt, chromium, nickel and zinc) is smaller than 100 ppb, and the service life of the resin carbon microspheres is prolonged. The material can be used as a precursor of negative electrode materials of silicon carbon, phosphorus carbon and hard carbon.

The invention discloses a rare earth concentrate chemical separation wastewater treatment method, which comprises: 1) adding an alkaline agent I and a precipitate I into rare earth concentrate chemical separation wastewater, and carrying out a reaction to obtain lead slag and a lead-removed supernatant; (2) adding a calcium agent, an alkaline agent II and a flocculating agent into the lead-removed supernatant to react, so as to obtain fluorine residues and fluorine-removed supernatant; (3) electrolyzing the fluorine-removed supernate to obtain iron slag and iron-removed supernate; 4) adding phosphate and a precipitant II into the iron-removed supernate for reaction to obtain phosphate precipitate of rare earth elements and rare earth-removed supernate; 5) carrying out evaporation concentration on the rare earth-removed supernatant to obtain an evaporation concentrated solution; and cooling the evaporated concentrated solution, and carrying out solid-liquid separation to obtain a CaCl2. 2H2O crystal and a mother solution. The lead element, the fluorine element, the iron element, the rare earth element and the calcium element in the rare earth ore concentrate chemical separation wastewater can be directionally separated and recycled step by step, and cross interference among the elements is avoided.

The invention discloses a method for detecting the content of elemental iron in a lithium iron phosphate material. The method comprises the following steps: separating magnetic foreign matters from the lithium iron phosphate material; the magnetic foreign matter is placed in the copper salt solution, a first solid matter is obtained through reaction, and the first solid matter comprises a copper element; and measuring the content of the copper element in the first solid substance to obtain the content of the elemental iron in the lithium iron phosphate material. According to the embodiment of the invention, the elemental iron and other iron-containing foreign matters in the magnetic foreign matters are subjected to differential treatment, and the content of the elemental iron in the lithium iron phosphate material is obtained according to the determination result of the content of the copper element obtained through the replacement reaction, so that the obtained detection result reduces the interference of non-elemental iron foreign matters on the content of the elemental iron, and the detection accuracy is improved. The detection accuracy of the content of the elemental iron in the lithium iron phosphate material is favorably improved.

The invention relates to biodegradable iron alloy-containing compositions for use in preparing medical devices. In addition, biodegradable crystalline and amorphous compositions of the invention exhibit properties that make them suitable for use as medical devices for implantation into a body of a patient. The compositions include elemental iron and one or more elements selected from manganese, magnesium, zirconium, zinc and calcium. The compositions can be prepared using a high energy milling technique. The resulting compositions and the devices formed therefrom are useful in various surgical procedures, such as but not limited to orthopedic, craniofacial and cardiovascular.

This invention provides a highly conductive preformed solder sheet, comprising a core layer and a shell layer disposed around the core layer. By embedding the solid flux core layer within the solder alloy layer to form a sandwich-like shape, the flux can be effectively protected from oxidation. There is no need to apply flux before brazing or remove it after brazing, reducing manufacturing costs and the void rate on the welded surface, thus improving the reliability of the solder sheet. The solder alloy shell is composed of tin, silver, copper, indium, cerium, vanadium, lutetium, yttrium, and zinc. The addition of small amounts of rare earth elements lutetium, yttrium, and cerium improves the conductivity and heat transfer of the solder sheet. The addition of indium, vanadium, and zinc increases the melting point of the solder sheet and improves its solidification state. Since no magnetic materials such as lead, iron, cobalt, nickel, or niobium are added, signal interference caused by metals is avoided.

The invention discloses a nano SiO2 composite iron microsphere toughening agent for well cementation cement, and belongs to the technical field of petroleum and natural gas well cementation engineering materials. The preparation method of the flexibilizer comprises the following steps: adding ferric trichloride into ethylene glycol, and stirring and dissolving at normal temperature to obtain a solution A; the preparation method comprises the following steps: adding polyvinylpyrrolidone into ethylene glycol, stirring and dissolving at a certain temperature to obtain a solution B, and then adding sodium citrate to prepare a solution C; tetraethoxysilane is added into deionized water and then mixed with the solution A, a hydrolysis reaction of tetraethoxysilane is carried out, and a solution D with nano SiO2 is prepared; gradually and slowly dropwise adding the solution D into the solution C at a certain temperature, and carrying out a first oxidation-reduction reaction; cooling to room temperature, adding sodium borohydride, and carrying out a second oxidation-reduction reaction; and filtering, washing and drying the solution to obtain the flexibilizer. The cement stone is endowed with high toughness and compressive strength through the synergistic effect of the iron elementary substance and the nano SiO2, and the cement stone has a wide market prospect.

The invention discloses an areca-nut solid fertilizer for improving the content of catechin and precise nutrition of areca-nuts and application of the areca-nut solid fertilizer, and belongs to the technical field of fertilizer preparation. The preparation method comprises the following steps: mixing cassava straws, cassava residues, hermetia illucens sand, calcium superphosphate, quick lime and zymophyte, and carrying out first composting fermentation to obtain a first fermented product; and adding macroelements containing monopotassium phosphate, potassium nitrate, urea, calcium carbonate and magnesium sulfate in a specific proportion, microelements containing boron, zinc, copper, iron and manganese in a specific proportion and bacillus subtilis into the first fermented product, carrying out second composting fermentation, and carrying out aging treatment to obtain the betel nut solid fertilizer. The prepared betel nut solid fertilizer can accurately provide nutrients according to the requirements of betel nuts for various nutrient elements, and negative effects on soil due to excessive nutrient elements are avoided; meanwhile, the content of areca catechin is increased, and the nutritional value of the areca catechin is enhanced.

This invention relates to the field of comprehensive utilization of solid waste, specifically providing a process for treating ilmenite ore using solid waste pyrolysis products. The process involves preheating the ilmenite ore to above 1000°C with low-oxygen flue gas, then feeding it along with waste plastics, waste coke, and other raw materials into a pyrolysis reduction reactor for pyrolysis reduction. The pyrolysis of waste plastics and waste coke generates reducing gases, ensuring the device is completely in a reducing gas atmosphere. These gases react with the ilmenite ore at high temperatures to generate magnetically separable elemental iron and Fe3O4, thereby increasing the actual FeTiO3 content. Compared to existing ilmenite ore processing technologies, this method significantly increases the processing temperature, improves processing efficiency, and achieves comprehensive energy utilization.

The invention discloses a dephosphorization material and a preparation method and application thereof, the dephosphorization material comprises: a base material, the base material comprises SiO2, Al2O3, Fe2O3, CaO and MgO; elemental iron; and a plant foaming agent. The large-aperture structures uniformly distributed inside and outside the phosphorus removal material are beneficial to growth and attachment of microorganisms, and generation sites are provided for the removal process of phosphoric acid. The elemental iron contained in the material and phosphate undergo valence change through chemical combination to form hydroxyl and phosphorus flocculation so as to efficiently remove phosphorus pollution. In addition, due to the characteristics of oxidation-reduction capability, low cost, high porosity, difficulty in bonding, large specific surface area, high active iron content and the like of iron, the material has stronger electrochemical enrichment, physical adsorption and oxidation-reduction properties. Therefore, the traditional bottleneck is solved, and excellent efficiency is achieved in a biological filter and an artificial wetland.

The invention discloses an MBBR (Moving Bed Biofilm Reactor) composite modified filler as well as a preparation method and application thereof, the MBBR composite modified filler comprises the following raw material components in parts by mass: 5-15 parts of elemental iron-carbon powder, 80-95 parts of a framework material, 5-10 parts of a corrosion inhibition carbon source and 3-5 parts of paraffin oil, wherein the corrosion inhibition carbon source comprises modified chitosan and starch, and the mass ratio of the modified chitosan to the starch is (1.5-4): 1; the modified chitosan comprises chitosan, 2-hydroxy-1, 4-naphthoquinone which is grafted on the chitosan through a-C = N-bond, and catechin which is grafted on the 2-hydroxy-1, 4-naphthoquinone. The iron-carbon micro-electrolysis technology is combined with the MBBR process, so that the biodegradability of the refractory wastewater is improved, and the wastewater treatment effect of the MBBR process is improved.

The invention relates to a crop nutrition and fortification composition comprising: elemental sulfur in the order of 1% to 90% by weight; one or more water-insoluble or water-soluble iron salts or derivatives or mixtures thereof, wherein the elemental iron content is in the order of 0.1% to 50% by weight; one or more water-insoluble or water-soluble zinc salts or derivatives or mixtures thereof, wherein the elemental zinc content is in the order of 0.1% to 55% by weight; one or more water-insoluble or water-soluble magnesium salts or derivatives or mixtures thereof, wherein the elemental magnesium content is in the order of 0.5% to 50% by weight; one or more water-insoluble or water-soluble boron salts or derivatives or mixtures thereof, wherein the elemental boron content is in the order of 0.01% to 25% by weight; one or more water-insoluble or water-soluble manganese salts or derivatives or mixtures thereof,where the elemental manganese content is in the order of 0.1% to 40% by weight; one or more water-insoluble or water-soluble copper salts or derivatives or mixtures thereof, where the elemental copper content is in the order of 0.1% to 40% by weight; and one or more surfactants in the order of 0.1% to 40% by weight. The composition is presented in the form of water-dispersible granules and liquid suspension, where the compositions have a particle size in the order of 100 nanometers to 5 microns and have a mean particle size diameter distribution of less than 1000 nanometers, and where the total content of the water-soluble salts, derivatives, or mixtures in the composition does not exceed 80% by weight of the total composition. The invention also relates to a process for preparing the nutritional composition and fortifying crops and to a method for treating plants, seeds, crops, plant propagation material,locus, or parts thereof, or soil with the nutritional and fortifying composition of crops.

The invention discloses a gasification reduction ironmaking method and a gasification reduction furnace, and belongs to the field of metallurgical chemical industry. The method comprises the following steps: step 1, spraying a carbon-containing substance, oxygen and water vapor into a gasification reduction furnace from the upper part of the gasification reduction furnace, and reacting at high temperature to generate crude synthesis gas serving as a main component; and 2, spraying an iron-containing substance into the gasification reduction furnace from the lower part of the gasification reduction furnace, and carrying out a reduction reaction on the iron-containing substance and the crude synthesis gas to generate elemental iron. According to the method, the crude synthesis gas is generated at the upper part of the gasification reduction furnace, and the iron-containing substance and the crude synthesis gas are subjected to reduction reaction at the lower part of the gasification reduction furnace, so that the position of the reduction reaction of the iron-containing substance and the position of the oxidation reaction of the carbon-containing substance powder are prevented from overlapping; therefore, the situation that the iron-containing substance is wrapped by dispersed droplets formed by melting ash generated during generation of the crude synthesis gas and the reduction reaction of iron is hindered is avoided, and the efficiency of the reduction reaction of the iron-containing substance is improved.

In an iron (II) citrate monohydrate, identified by the formula FeC6H6O7-H2O ( Ferrous citrate monohydrate or iron citrate (II) monohydrate), obtained according to a particular production method, citric acid and elemental iron are bound in a molecular complex where the iron is agglomerated in the citrate which moves to a cyclic form and the iron is bound to the O groups of the carboxylic groups 1 and 3 through ionic bonds, forming two enantiomers, D and L (R and S), both perfectly water-soluble and highly assimilable by the human body. Formula (L) & Formula (D). With a different absorption mechanism from traditional iron molecules, said iron citrate monohydrate is usable in pharmaceutical and / or nutraceutical and / or food compositions, in particular in the treatment and prevention of iron deficiency anemias and in general of all diseases and disorders associated with iron deficiency. The effectiveness is proven by several examples.

The invention discloses a comprehensive treatment method for zinc-containing solid waste, which aims at the characteristics of the zinc-containing solid waste, takes high price of the zinc-containing solid waste as a target, and performs gradient utilization and treatment on flue gas generated in the process through process optimization design, so that on one hand, effective components in the flue gas are effectively utilized, and the waste gas treatment cost is reduced; on the other hand, the zinc-containing solid waste is converted into high-value zinc calcine, zero-valent iron, cement clinker, high-chlorine dust and the like which can be directly sold to generate products with economic value, so that full-quality utilization of the zinc-containing solid waste is realized, and no secondary solid waste is generated. In addition, the method disclosed by the invention is simple in overall process flow, simple to operate, low in operation cost and high in treatment efficiency, and has remarkable economic value and environmental benefit.

The utility model discloses a carbon-containing hazardous waste pretreatment system for an electrolytic aluminum factory. The carbon-containing hazardous waste pretreatment system comprises a vibrating feeder, a jaw crusher, a cone crusher, a first iron remover, a first screening machine, a dry ball mill and a powder concentrator. The system has the advantages that block materials can be subjected to coarse crushing, medium crushing and fine grinding treatment through the jaw crusher, the cone crusher and the dry ball mill, qualified powder is obtained, elemental iron and elemental aluminum can be effectively separated out in the process, the content of the elemental iron and the content of the elemental aluminum in the powder are reduced, and the production cost is reduced. And therefore, the influence on subsequent valuable metal recovery and the purification cost are reduced. Moreover, the first screening machine can convey the sorted elemental aluminum and elemental iron to the manual sorting platform, manual sorting of the elemental aluminum and the elemental iron is completed in the manual sorting platform, operation on a conveying belt is not needed, the operation safety is improved, most of the elemental iron is sorted by the first iron remover, therefore, the labor intensity of subsequent manual sorting is reduced, and the working efficiency is improved. And the working efficiency is improved.

A hot work tool steel for high pressure die casting includes the following main components (in wt. %): C 0.28-0.39, Si 0.05-0.35, Mn 0.1-0.8, Cr 5.4-6.0, Ni≤0.3, Mo 1.8-2.5, V 0.6-1.1, balance optional elements, iron and impurities.

The invention provides lunar soil component and particle size grading separation equipment and method. The grading separation equipment comprises a box body, a grading rotary vibration sieve, an optical separation unit, an electric separation unit and an infrared separation unit, the grading rotary vibrating screen comprises a vibrating screen cylinder, at least two screens and a storage box; the storage box is connected with the discharge hole; the optical sorting unit comprises a first conveying belt, an optical recognition assembly and a first material collector. The electric separation unit comprises a drum electric separator and an ore bucket; the infrared separation unit comprises a second conveying belt, an infrared assembly and a second material collector. Lunar soil particles are conveyed from the feeding port to the discharging port through the vibrating screen cylinder, the lunar soil particles are sorted into at least three different particle size ranges through the at least two screens and conveyed to the storage box through the corresponding discharging port, the lunar soil particles in the different particle size ranges can be directly obtained, and the screening efficiency is improved; the optical recognition assembly recognizes lunar soil particles containing glass substances and removes the lunar soil particles into the first material collector, the drum electric separator removes lunar soil particles containing rock minerals into an ore bucket below the drum electric separator, and the lunar soil particles containing nanometer elemental iron are guided into the infrared separation unit; the infrared assembly is used for precisely positioning the lunar soil particles containing the nanometer zero-valent iron and removing the lunar soil particles into the second material collector, glass substances and rock minerals are further removed, and the lunar soil particles containing the nanometer zero-valent iron and higher in purity are obtained. The equipment can realize effective separation of bonded aggregate rocks and glass components, and the situation that the original properties of lunar soil are damaged and the quality of additive manufacturing is affected is avoided.

The invention relates to a magnetic material comprising at least iron, in metallic form and / or in oxide form, and at least an alumina oxide matrix, the iron content being between 15% and 70% by weight as element iron relative to the total weight of said material, characterized in that said material has a specific surface area greater than 50 m² / g and less than 300 m² / g, said material is in the form of beads or extrudates, and in that said material comprises at most 25% by weight of hematite relative to the total weight of said material.

The present invention relates to an anode active material comprising: natural graphite particles; and elemental iron, elemental silicon, and elemental sulfur present on the surface, inside, or both on the surface and inside the natural graphite particles, wherein the total content of the elemental iron, the elemental silicon, and the elemental sulfur is more than 5 ppm and 100 ppm or less on the basis of the total weight of the natural graphite particles, and the content of the elemental iron is 5-50 ppm on the basis of the total weight of the natural graphite particles.