108 results about "Elemental iron" patented technology

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 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.

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.

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.

The application discloses a low-carbon aluminum-silicon casting alloy and a preparation method thereof. By adjusting the proportion of Fe and Mn, the morphology of the iron-rich manganese-rich phase is changed, and then the coarse iron-rich manganese-rich phase is modified by using Co and Sr and other elements to reduce the size of the coarse iron-rich manganese-rich phase, so that the damage to the mechanical properties is reduced. Therefore, the content limit of the harmful element iron can be greatly improved under the premise of ensuring the mechanical properties, and low-carbon, low-cost and high-performance are achieved.

This invention discloses a nano-SiO2 composite iron microsphere toughening agent for cementing, belonging to the technical field of oil and gas cementing engineering materials. The toughening agent is prepared as follows: ferric chloride is added to ethylene glycol and dissolved under stirring at room temperature to form solution A; polyvinylpyrrolidone is added to ethylene glycol and dissolved under stirring at a certain temperature to form solution B, then sodium citrate is added to prepare solution C; tetraethyl orthosilicate is added to deionized water and mixed with solution A to carry out the hydrolysis reaction of tetraethyl orthosilicate, preparing solution D containing nano-SiO2; at a certain temperature, solution D is gradually and slowly added dropwise to solution C to carry out the first redox reaction; after cooling to room temperature, sodium borohydride is added to carry out the second redox reaction; the solution is filtered, washed, and dried to obtain the toughening agent. This invention imparts high toughness and compressive strength to cement stone through the synergistic effect of elemental iron and nano-SiO2, and has broad market prospects.

According to the method for preparing the battery-grade iron phosphate through magnetite and reduction leaching, hydroquinone and ascorbic acid are added into the leaching agent phosphoric acid aqueous solution to serve as a reducing agent together, on one hand, hydroquinone and ascorbic acid have high reducibility, and the phenomenon that the iron source is damaged at the moment when the iron source makes contact with the leaching agent can be avoided; fe < 2 + > released by the magnetite is oxidized into Fe < 3 + > by residual oxygen in the liquid phase, and the reaction path of oxidizing Fe < 2 + > into Fe < 3 + > in the liquid phase is thoroughly blocked, so that the reaction of the elemental iron and the target Fe < 3 + > is promoted; and on the other hand, under the acidic condition, hydroquinone and ascorbic acid can form complexes [Fe (C6H4 (OH) 2)] < 2 + > and [Fe (C6H7O6)] < 2 + > with Fe < 2 + > in a leaching system respectively, the concentration of Fe < 2 + > in a liquid phase is reduced, reaction balance forward movement of ferrous ions released by magnetite is promoted, and the leaching rate of the iron element is greatly increased.

The invention provides a method and a device for multi-stage reduction of iron by utilizing natural gas graded reforming, and belongs to the technical field of energy conservation, emission reduction and hydrogen energy ironmaking. The method for multi-stage reduction of iron by using natural gas fractional reforming comprises the following steps: performing natural gas fractional reforming in a gas production unit, wherein hydrogen and carbon monoxide are produced step by step by using a methane cracking reaction and a carbon-carbon dioxide neutralization reaction; according to the reaction characteristics of different reduction stages of the original iron oxide, hydrogen and mixed gas of hydrogen and carbon monoxide in different proportions are supplied to different reduction stages of the original iron oxide so as to carry out a multi-stage iron reduction reaction, and elemental iron is obtained; wherein in the multi-stage reduced iron reaction, the valence state of the original iron oxide is gradually reduced until zero-valence-state elemental iron is obtained.

The invention relates to the technical field of soil environment treatment, and discloses a modifier for soil mineralization, salt fixation and plant growth promotion in facility agriculture and application. The modifier comprises the following components: an iron-based mineralizer, a calcium-based mineralizer and a basic resource material and / or a water-retaining porous material. The components of the modifier are mixed with to-be-remediated soil for soil remediation. According to the modifier provided by the invention, the LDH-like natural mineral phase is naturally formed in situ in the soil by supplementing the deficient elements (iron base, calcium base and the like) for forming minerals in the soil, so that the in-situ mineralization fixation ('ion exchange-electrostatic adsorption-lattice embedding 'three-stage fixation path) of salt-based ions is completed, and the natural mineralization rule of the soil is met; the soil salt-based ions are directly and accurately fixed, the soil salinity is reduced, and the soil property is improved.

This invention discloses a denitrification biological packing material based on iron-carbon micro-electrolysis, its preparation method, and its application, belonging to the field of wastewater treatment technology. The invention involves mixing iron powder and activated carbon powder, adding a binder to bind them together into iron-carbon particles; then adding sulfur powder and stirring at the melting point of sulfur to ensure a tight and uniform bond between the sulfur and the iron-carbon particles. After adding the binder, granulation and cooling yield a spherical composite packing material with a microscopic structure of sulfur molecules coating elemental iron and activated carbon. The packing material and related autotrophic bacteria are added to the nitrate wastewater to be treated, forming a coupled denitrification system. This invention introduces an iron-carbon micro-electrolysis reaction, enabling faster and better integrated coupling of anaerobic ammonia oxidation and sulfur autotrophic denitrification, which not only improves the system's denitrification efficiency but also enhances its buffering capacity.

This invention belongs to the field of flow battery energy storage technology, and relates to a negative electrode electrolyte for alkaline all-iron flow batteries and its preparation method. The negative electrode electrolyte is prepared from iron salts, a complexing agent, a promoting component, an alkaline component, an auxiliary electrolyte, and water. The total iron concentration is 0.1–2.0 mol / L, the molar ratio of the complexing agent to the iron salt is 1.5–4, the molar ratio of the promoting component to Fe is 0.05–1.0, the alkaline component concentration is 2.0–6.0 mol / L, and the auxiliary electrolyte concentration is 0–2.0 mol / L. The negative electrode electrolyte of this invention for alkaline all-iron flow batteries has a high total iron concentration, which not only avoids the precipitation of elemental iron during charging and discharging, but also effectively prevents the formation of ferric hydroxide precipitate, improves the stability of iron ions, and greatly extends the cycle life of the negative electrode electrolyte. It can be widely used in aqueous alkaline all-iron flow batteries.

A nonaqueous electrolyte power storage element according to one aspect of the present invention may be charged / discharged or left in an environment of 50°C or higher, and comprises: a positive electrode that has a positive electrode active material containing an iron element; and a nonaqueous electrolyte containing a compound having a fluorosulfonyl group. The content of the compound having a fluorosulfonyl group in the nonaqueous electrolyte is 0.8 mass% or more.

The invention provides a catalyst, a preparation method and a plasticizer degradation method, the catalyst comprises manganese dioxide, and an iron element and a nickel element which exist in a manganese dioxide lattice, and the total doping amount of the iron element and the nickel element accounts for 5-10% of the total mass. On one hand, an iron element and a nickel element enter crystal lattices of manganese dioxide at the same time, the nickel element and the iron element have a synergistic effect, the ion radius is similar to that of manganese ions, the nickel element and the iron element have complementary electronic structures, and compared with main group metal elements, the nickel element and the iron element enter the crystal lattices of manganese dioxide more easily, and crystal lattice stress is reduced; on the other hand, the iron element enables the catalyst to have magnetism, so that the catalyst is convenient to recycle.

In the ferric iron citrate monohydrate defined by the chemical formula FeC6H6O7 H2O (ferrous citrate monohydrate or ferric iron citrate monohydrate) obtained according to a specific production method, the citric acid and the elemental iron are combined in a molecular complex in which the iron is gathered in the citrate moving into a ring-like form and the iron is bound to the O groups of the carboxyls 1 and 3 through ionic bonds, forming two enantiomers D and L (R and S), both of which are completely water-soluble and highly absorbable by the human body. Formula (L) and Formula (D). With a different absorption mechanism than traditional iron molecules, said ferric iron citrate monohydrate can be used in pharmaceutical compositions and / or nutritional compositions and / or food compositions, in particular for the treatment and prevention of iron deficiency anemia and all diseases and conditions associated with iron deficiency. The effectiveness is demonstrated through several examples.

The invention provides a method for efficiently recovering rare earth from permanent magnet waste and co-producing molten iron, which comprises the following steps of: mixing permanent magnet waste powder and an auxiliary agent, filling the mixture into a blast furnace, filling argon atmosphere, and gradually heating; continuously heating until the permanent magnet waste powder is completely molten, regulating and controlling the temperature in the furnace, regulating and controlling the oxygen concentration in the furnace, and keeping until smelting is finished, so that high-content rare earth oxide powder is obtained by a blast furnace dust collector, and rare earth oxide, elemental molten iron and mixed bottom slag containing iron oxide are obtained in a blast furnace inner cavity; argon is continuously injected into the bottom of the blast furnace while the oxygen concentration in the furnace is regulated, hydrogen is injected into the bottom of the blast furnace at intervals, ferric oxide is reduced into elemental iron, and elemental molten iron is collected after smelting is finished; and after the oxygen concentration in the furnace is regulated and controlled for a period of time, the rare earth oxide is subjected to cavitation crushing at set intervals, agglomeration of the rare earth oxide is destroyed, small-particle-size oxide floats upwards, and after smelting is finished, rare earth oxide scum on the upper layer is collected. The recovery rate of the rare earth oxide is greater than or equal to 98.5%.

The present invention relates to a water dispersible granular composition comprising a homogeneous mixture of one or more of water insoluble Magnesium salt, complex or derivatives thereof in the range of 5%-80% w / w of the total composition and one or more of water insoluble Iron salt, complex or derivatives thereof in the range of 1%-50% w / w of the total composition; with at least one agrochemically acceptable excipient; wherein the elemental Iron is present in the range of 0.01% to 50% by weight of the total composition and wherein the elemental Magnesium is present in the range of 0.1% to 50% by weight of the total composition and wherein the composition comprises particles in size range of 0.1micron-30 microns. The present invention relates to a process of preparing the crop nutrition composition and method of treating plants, seeds, crops, plant propagation material, locus, plant parts thereof or soil with the crop nutrition composition.