60 results about "Magnesium ferrite" patented technology

The invention relates to a preparation method of nano magnesium ferrite, which comprises the following steps: mixing FeCl3.6H2O and FeCl2.4H2O in a mol ratio of 1:1, dropwisely adding a 2 mol/L NaOH solution, and preparing magnetic Fe3O4 nanoparticles by a chemical coprecipitation process; putting the magnetic Fe3O4 nanoparticles into a muffle furnace, and roasting at 500 DEG C for 3-4 hours to obtain nano Fe2O3; putting magnesium powder in a beaker, adding deionized water, and putting the beaker in an ultrasonic cleaner to treat for 5-8 hours, thereby obtaining a white turbid liquid; putting the supernatant of the turbid liquid in a clean beaker, drying in a drying box at constant temperature, and grinding the product to obtain Mg(OH)2; roasting the nano Mg(OH)2 in a muffle furnace at 350 DEG C for 3-4 hours, and roasting the Fe3O4 nanoparticles in a muffle furnace at 500 DEG C for 3-4 hours; respectively obtaining nano MgO and nano Fe2O3; and taking the nano Fe2O3 and the nano MgO, mixing the nano Fe2O3 and the nano MgO in a mol ratio of 1:1, adding deionized water, treating in an ultrasonic cleaner for 10-12 hours to obtain a red turbid liquid, sucking the supernatant of the turbid liquid into a clean beaker, drying the beaker in a drying box at constant temperature, and grinding the product to obtain the nano magnesium ferrite. The nano magnesium ferrite prepared by the method provided by the invention has the advantages of low cost, high purity, uniform appearance, environmental protection and no pollution.

The invention relates to a kind of composed method of magnesium ferrite of spinel structure. It includes the following steps: extract trivalent iron ion and divalent iron ion in water phase through organic extractant, get predecessor of; absterge it with secondary distilled water for2-3 times and get pure load metal predecessor of organic phase; mix organic phase of Mg2+ and Fe3+ with mol rate of 1:2 and introduce them into autoclave, add distilled water according to the rate of 3:1 or 4:1 of organic phase and water phase and airproof it, and then mix it fiercely, stripping with hydrothermal method at temperature between 200 degree C and 300 degree C and make them react for 2.5 hours; cool it to the room temperature under natural condition, separate liquid and centrifugalize it, absterge it with absolute alcohol for 2-3 times and dry it at temperature of 50 degree C for 30-180 minutes, then get product of magnesium ferrite. The organic material in the invention can be used circularly, the cost is low; the craft is simple and energy consumption id low; the discharge of the waste water is low; it is convenient to control the size of particle of oxide deposition in the range of supermicron.

The invention discloses a preparation method for a spherical nanometre magnesium ferrite desulfurizer, which belongs to the field of pollution control and technology. The method comprises the following steps of: dissolving a ferric nitrate and a magnesium nitrate in a glycol; adding an ammonium acetate into the mixture under the condition of violent stirring; putting the microemulsion in a high-pressure reactor to perform crystallization at 108 to 200 DEG C for 24 to 48h; and after filtering, washing and drying, calcining in a muffle furnace at 500 DEG C for 2h to obtain the spherical nanometre magnesium ferrite desulfurizer. The material is tested by an absorption test and the obtained magnesium ferrite has SO2 adsorbability. The method not only broadens a good magnesium shape changing and synthesizing method, but also has good SO2 adsorbability. The preparation method has good application value and application prospect in the field of absorption catalysis.

The invention relates to a photocatalyst for degrading organic dye waste water pollutants. The catalyst is formed by compounding magnesium ferrite and silver vanadate nanoparticles. The chemical composition general formula of the photocatalyst is mMgFe2O4/Ag3VO4, wherein m is the mass ratio of MgFe2O4 to Ag3VO4; and m is more than 0 and less than or equal to 0.005. A preparation method of the photocatalyst comprises the following steps of: firstly, preparing magnesium ferrite and silver vanadate powder with a citric acid sol-gel method and a chemical precipitation method respectively; secondly, mixing and grinding the magnesium ferrite and silver vanadate powder for 10 minutes according to the mass ratio of the magnesium ferrite to the silver vanadate; and lastly, baking at the temperature of 200-500 DEG C, and baking for 4 hours to obtain a finished catalyst. The catalyst has a simple preparation method, has high visible light degrading performance on organic pollutants in dye waste water, and contributes to recycling simultaneously.

The invention relates to a method and device for removing SO2 in flue gas with copper extracting tailings and recycling the copper extracting tailings, and belongs to the technical field of environmental protection. Ferrous metasilicate (Fe2SiO4), magnesium ferrite (MgFe2O4), hedenbergite (CaFeSi2O6) and other sulfur removal active substances in the copper extracting tailings are used for reacting with SO2 in the flue gas in an aqueous solution to generate sulfite, then sulfate is generated under the action of oxygen in the flue gas, the SO2-containing flue gas makes contact with copper extracting tailing slurry, SO2 is absorbed, and thus the flue gas is purified; by adding ammonium sulfide, ammonium bicarbonate and lime milk step by step, iron ions, zinc ions, copper ions, ammonium ions and other ions in the sulfur removal slurry can be resourcelized to be reused.

The invention discloses a preparation method of magnesium ferrite nano-particles. The preparation method comprises the following steps of mixing magnesium powder and deionized water into a first mixture according to a ratio of 1g: 25mL to 1g: 20mL, carrying out ultrasonic hydrolysis of the first mixture at a normal temperature under normal pressure to obtain white liliquoid, carrying out constant-temperature drying of the white liliquoid, grinding the dried white liliquoid to obtain Mg(OH)2 nano-particles, weighing the Mg(OH)2 nano-particles and FeCl3.6H2O according to an element content ratio of Mg to Fe of 1: 2, adding the weighed Mg(OH)2 nano-particles into a first beaker with deionized water, carrying out ultrasonic pre-treatment for 1h, putting the weighed FeCl3.6H2O into a second beaker, carrying out precipitation by a chemical coprecipitation method to obtain Fe(OH)3 precipitates, diluting the Fe(OH)3 precipitates by deionized water so that the Fe(OH)3 precipitates have a pH value of 7, mixing the pretreated Mg(OH)2 and the dilute Fe(OH)3 precipitates having a pH value of 7 by stirring for a certain time to obtain a second mixture, carrying out ultrasonic activation of the second mixture under normal pressure, in ultrasonic activation, taking out the mixture, carrying out stirring multiple times to obtain a third mixture, carrying out constant-temperature drying of the third mixture to obtain a forth mixture, grinding the forth mixture into powder, putting the powder into a muffle furnace, carrying out calcination at a temperature of 700 DEG C for 5h, and carrying out cooling in the muffle furnace.

The invention relates to a preparation method of a diatomite/magnesium ferrite composite material which can adsorb and degrade hexavalent chromium ions. The method comprises the following steps: 1) dissolving diatomite into ammonia water, and fully dipping the diatomite with the ammonia water by means of stirring so as to form diatomite suspension; 2) adding hexadecyl trimethyl ammonium bromide into the suspension to obtain a mixture and evenly stirring the mixture; 3) dropwise adding a solution containing magnesium chloride and ferrous oxalate into the evenly-stirred suspension slowly to obtain a mixed solution; 4) carrying out aging treatment on the mixed solution for 8 to 10 hours under a hydrothermal condition of 160 to 200 DEG C, cooling, washing, filtering and drying to obtain the diatomite/magnesium ferrite composite material. According to the method disclosed by the invention, magnesium ferrite with an ordered nanostructure is loaded on a diatomite algae disc, so that the limitation during application of a nanostructure material can be effectively solved, the adsorption efficacy of the diatomite also can be improved, and the catalytic reduction ability of the composite material is given to the hexavalent Cr at the same time.

The invention relates to an environmentally friendly refractory material. The environmentally friendly refractory material comprises, by mass, 60-80 parts of magnesia particles, 10-20 parts of magnesia fine powder, 10-30 parts of silicon carbide particles, 10-30 parts of silicon powder, 10-20 parts of magnesium ferrite, 14-20 parts of expanded perlite, 10-22 parts of chrome oxide fine powder, 10-20 parts of alumina silicate fibers, 12-24 parts of aluminum nitride, 10-24 parts of potassium feldspar, 12-20 parts of mullite, 14-20 parts of carbon black, 16-20 parts of chrome oxide micro-powder, 12-20 parts of tabular corundum powder, 1-10 parts of an anti-oxidant and 4-10 parts of an organic bonding agent. The environmentally friendly refractory material has high strength, thermal shock resistance, oxidation resistance, wear resistance, erosion resistance, high temperature resistance and long service life.

The invention discloses a preparation method of a high-specific surface nanometer magnesium ferrite catalyst material capable of being used in a solid propellant, relating to the field of nanometer material synthesis and high-energy solid propellants. The preparation method comprises the following steps: dissolving an inorganic iron salt and an inorganic magnesium salt in distilled water, adding glycine and an inert inorganic salt, reacting at a temperature of 45-75 DEG C to form a wet sol, raising the temperature to 95-125 DEG C to evaporate a solution after reaction, rapidly performing self-propagating combustion reaction on dried gel obtained after the wet gel is completely evaporated so as to generate powder, washing and drying the dry powder to obtain the nanometer MgFe2O4 catalyst material. The prepared high-specific surface nanometer magnesium ferrite catalyst material is high in catalysis activity; the preparation method is simple and controllable in process, free from pollution, and low in cost, thereby having great application prospect in the field of solid propellants; the high-specific surface nanometer magnesium ferrite catalyst material is easily produced in a large scale.

The invention belongs to the technical field of nanomaterial synthesis. Firstly, an electrostatic spinning method is adopted to synthesize magnesium ferrite, then an evaporation method is adopted to enable molybdenum sulfide to grow on the magnesium ferrite so as to form the magnesium ferrite/molybdenum sulfide heterostructure nanowires. The tetracycline degradation rate of the prepared magnesium ferrite/molybdenum sulfide heterostructure nanowires prepared by means of the synthesis method is up to 92% in 120 minutes, and the hydrogen production efficiency in a water and methanol mixed solution is 5.8 mmol/h.m<2>.

The invention relates to a lithium sulfur battery composite cathode material and a preparation method thereof. The composite cathode material is prepared by compounding ferrite with elemental sulfur.The ferrite is one of magnesium ferrite, zinc ferrite, copper ferrite or manganese ferrite. The preparation method includes: preparing a ferrite material by high temperature calcination method, and then conducting compounding with elemental sulfur by liquid phase method. The preparation method has a mature process and simple procedure, and is easy to acquire a high sulfur content composite cathodematerial. The lithium sulfur battery composite cathode material prepared by the invention utilizes the strong chemical adsorption effect of ferrite on polar lithium polysulfide, greatly inhibits thedissolution of lithium polysulfide in an ether electrolyte solution, accordingly slows down the shuttle effect, and then shows characteristics of high sulfur content, high sulfur utilization and highcycle stability.

The invention belongs to the field of resource regeneration, and particularly relates to a method for separating calcium ferrite and magnesium ferrite from steel slag magnetic separation tailings. Themethod comprises the following steps: firstly, crushing the steel slag magnetic separation tailings containing 20%-30% of iron to 10mm-13mm by using selective crushing equipment, and selectively dissociating coarse-grained elemental iron particles; secondly, conducting magnetic separation under the field intensity of 300 Gs-1500 Gs, removing coarse-grained elemental iron in the form of magnetic concentrate and using the coarse-grained elemental iron as a steelmaking raw material; thirdly, finely crushing the magnetic separation tailings to 0.5mm-3.5mm by using roller type crushing equipment,and selectively dissociating calcium ferrite and magnesium ferrite by using hardness difference; and fourthly, carrying out magnetic separation under the field intensity of 500 Gs-3200 Gs, separatingout fine-grained elemental iron and merging the fine-grained elemental iron into the steelmaking raw material, and purifying residual calcium ferrite and magnesium ferrite crude products through a vibration bed eddy current sorting machine, thus obtaining a final product. The tailings without specific purposes generated in the process are merged for producing a cementing material, and finally all-component resource utilization of the steel slag is achieved.

The invention relates to a molybdenum sulfide-ferrite nano-enzyme as well as a preparation method and an application method thereof. The preparation method comprises the following steps: uniformly mixing ferric chloride hydrate, magnesium chloride hydrate and dodecyl amine with a proper amount of ethylene glycol; enabling the components to react in a high-pressure reaction kettle, and repeatedly cleaning the product; drying the product so as to obtain ferrite magnesium; dissolving ammonium tetrathiomolybdate into dimethyl formamide; slowly adding hydrazine hydrate, and uniformly mixing; putting a proper amount of the ferrite magnesium into the mixed liquid; enabling the components to react in the high-pressure reaction kettle, and repeatedly cleaning the product; drying the product so as to obtain molybdenum sulfide-ferrite magnesium; putting the molybdenum sulfide-ferrite magnesium into a proper amount of TMB (Tetramethylbenzidine) and hydrogen peroxide-sodium acetate buffer solutionsof different concentrations; culturing, and testing the concentration of hydrogen peroxide. Results show that when being adopted to detect hydrogen peroxide, the molybdenum sulfide-ferrite magnesiumnano-enzyme is convenient and rapid to operate, high in sensitivity and wide in detection concentration range.

The invention discloses a preparation method of a magnesium ferrite/silver phosphate compound photocatalyst. The preparation method comprises the following steps of (1) dropwise adding 50-100mL of 0.2-0.4mol/L silver nitrate in 50-100mL of 0.1-0.2mol/L sodium hydroxide solution while stirring, and separating a supernate so as to obtain silver oxide particles; adding 30-50mL of an ammonia-water solution with the mass concentration being 20%-25%, and stirring until silver oxide is fully dissolved to generate a silver ammonia complexing solution; and adding 0.4-0.6mol of ferric nitrate and 0.2-0.3mol of magnesium nitrate to the silver ammonia complexing solution, after stirring for 3-4h, adding 0.02-0.03mol of sodium dihydrogen phosphate, unceasingly stirring for 2-3h, filtering and washing for 3-4 times, drying at 110-120DEG C, roasting for 5-6h at 500-600DEG C, and performing furnace cooling so as to obtain the magnesium ferrite/silver phosphate compound photocatalyst. The preparation method provided by the invention has the advantages that a synthetic process is simple, silver phosphate and magnesium ferrite are closely contacted, transition of photoproduction electrons is facilitated, the recombination is avoided, and the catalytic efficiency is improved.

The invention discloses a preparation process of an orange-yellow high temperature-resistant magnesium ferrite pigment, which comprises the following steps of: mixing a certain amount of iron oxide yellow filter cakes with industrial activity magnesium oxide and simultaneously adding an assistant playing dispersion and anti-sintering roles to carry out batching, pulping, high-speed dispersion, suction filtration, drying, roasting reaction and crushing to obtain the orange-yellow high temperature-resistant magnesium ferrite pigment. The preparation process has the advantage that the needle iron yellow fresh filter cakes with good reaction activity and grain sizes controlled within a certain range and a certain specification of active magnesium oxides produced by the company are preferably selected to be pulped and mixed by a wet process. The invention has the beneficial effects that the production process flow can be greatly simplified; the preparation process is easy in operation, high in yield and low in cost; and the prepared product is pure in color and is good in dispersibility.

The invention discloses a preparation method of a magnesium ferrite nanofiber negative electrode material, and belongs to the technical field of nanometer materials and chemical power supplies. The MgFe2O4 nanofiber negative electrode material is prepared through an electrostatic spinning and calcination technology, and the method is simple in preparation process, low in cost, friendly to the environment and beneficial to further production expansion. The lithium ion battery negative electrode material, namely MgFe2O4 nanofiber, has a high discharge platform, large initial discharge capacity and stable circulating performance, and has wide development prospects as a new generation of lithium ion battery negative electrode material.

The invention discloses a magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and a preparation method and application thereof. The magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent is prepared by using reed as a raw material and conducting magnesium ferrite modification, lanthanum alginate embedding and balling and high-temperature carbonization. A magnetic magnesium ferrite biochar composite microsphere prepared by the method has a diameter of 2.5-3.5 mm, has high adsorption capacity on phosphate, and is excellent in masstransfer performance and regeneration effect; magnetic magnesium ferrite modified biochar is wrapped in the porous microsphere, so the loss of nanometer magnesium ferrite is prevented, the mass transfer performance of the microsphere is improved, and meanwhile, the effective recovery and regeneration of the adsorbent are realized by utilizing the advantages of easy settling performance of the microsphere and the magnetism of the magnesium ferrite in the microspheres; and the preparation method has the advantages of easy availability of raw materials, simple technique and mild conditions, andis suitable for large-scale industrial production and use.

This invention relates to a method to prepare permanent ferromagnetic materials. It includes following steps: addition of adhesives into ferro oxide magnetic materials; moisture adjustment; molding, magnetization and compression of moisture-adjusted mixture and sintering at high temperatures. The characteristics is that, the ferro oxide magnetic materials are chosen from one of several species of ferro oxide, manganese-zincum ferrite, manganese ferrite, magnesium ferrite and copper-zincum ferrite, and metal nitrite weighing 1~2wt% of the total magnetic materials mentioned above is also added. The adhesives include thermoplastic resin containing keto-groups and weigh 0.1~0.2wt% of the total mixture. The moisture content in the mixture during moisture adjustment is 0.2~0.4wt%. Finally, the sintering is carried out at a temperature between 350~450 deg. C. This invention has the outstanding specificity that low-temperature sintering can be realized by modification of raw materials and adhesives and thus cost is cut down; orientation can be enhanced and magnetic properties can be optimized.

The invention discloses a lanthanum-doped magnesium ferrite composite material. A preparation method of the lanthanum-doped magnesium ferrite composite material comprises the following steps: (1) adding Fe3O4, magnesium chloride and lanthanum nitrate into water, and uniformly mixing to form a mixed solution, wherein the molar ratio of Fe3O4 to Mg<2+> to La<3+> is 2: 1: 1-8, preferably 2: 1: 7, and(2) adding a NaOH solution to enable the pH value of the solution to be greater than or equal to 10, reacting, and after the reaction is finished, separating out the product to obtain the lanthanum-doped magnesium ferrite composite material which is named as La@MgFe2O4. The invention discloses the lanthanum-doped magnesium ferrite composite material which can be used for adsorbing/removing phosphorus in sewage, has a high adsorption capacity for phosphate, is not influenced by coexisting anions in natural water, has a wide pH application range and a wide temperature application range (when the temperature is reduced to 10 DEG C, the adsorption capacity is almost the same as that at 25 DEG C), is slightly influenced by the temperature, can be recycled for multiple times, and can be separated by using a magnet.

The invention relates mixtures of pigments containing at least one inorganic compound selected from among the group consisting of iron oxides, iron oxide hydroxides, zinc ferrites, zinc oxides, magnesium ferrites and manganese ferrites, said at least one inorganic compound being provided with a coating containing at least one magnesium or calcium hydroxide or oxide, and at least one calcium salt or magnesium salt of a fatty acid, methods for the production of said mixtures, the use thereof for dyeing polyvinyl chloride (PVC), methods for dyeing PVC, PVC dyed with mixtures of said type, and plastic products containing mixtures of said type.

The invention relates to a magnetic control frequency modulation far-infrared optical switch which comprises a magnesium ferrite based metamaterial and a dielectric substrate which are arranged in sequence. The magnesium ferrite based metamaterial is formed by alternative overlapping of a magnesium ferrite film 1 and an aluminum oxide film 2 in the X-axis direction and is of a one-dimensional periodic layered structure. The thicknesses of the magnesium ferrite film 1 and the aluminum oxide film 2 in the X-axis direction are both smaller than one twentieth of the wave length of the selected electromagnetic wave for entering the optical switch. The lengths of the magnesium ferrite film 1 and the aluminum oxide film 2 in the Y-axis direction and Z-axis direction are both 10 times greater than the wave length. Accordingly, the magnesium ferrite based metamaterial can be obtained. The provided structure can control the magnetic susceptibility of the magnesium ferrite film under the regulation of an external magnetic field, the transformation of the magnesium ferrite based metamaterial from an ordinary non-magnetic medium to a magnetic hyperbolic medium is achieved, accordingly, the transmissivity of an incident TE polarized wave is controlled, and the optical switch is obtained.

The invention relates to a refractory material, and particularly relates to a magnesium-aluminum refractory material. The magnesium-aluminum refractory material comprises the following mineral constituents: periclase (M), magnesium-alumina spinel (MA), forsterite (M2S), calcium-magnesium monticellite (CMS), and magnesium ferrite (MF). The magnesium-alumina spinel (MA) is high in melting point, small in thermal expansion, low in thermal stress, and good in thermal shock stability, has stable chemical property and strong resistance to basic slag, is a core for using magnesium-aluminum non-burning bricks, and is one of key materials for prolonging the service life. Therefore, the magnesium-aluminum refractory material has no seam melting loss and has better anti-slagging capacity and thermal shock resistance, the structure peeling phenomenon caused by the penetration of molten steel and slag can be overcome, and the service life is obviously prolonged; and as the product is non-burning or burnt at low temperature, energy resources can be saved, the cost can be lowered, the economic benefits are obvious, and thus the magnesium-aluminum refractory material is a high-quality refractory material.