329 results about "Manganese(II,III) oxide" patented technology

The invention discloses a graphene/manganese tetraoxide nanocomposite and a preparation method thereof. The method comprises the following steps of firstly, diluting graphite oxide concentrated solution to be 0.1-5mg/mL with deionized water, stirring uniformly, after water bath ultrasonic at room temperature, putting a beaker into ice-water bath, and carrying out ultrasonic treatment by a probe ultrasonic processor to obtain graphene oxide solution; secondly, adding permanganate into the graphene oxide solution, stirring till the permanganate is dissolved completely, adding a reducing agent, and stirring uniformly; thirdly, reacting the solution obtained in step two at 80-120 DEG C, after reacting, cooling, centrifuging and washing, and vacuum-drying, so as to obtain the graphene/manganese tetraoxide nanocomposite. The graphene/manganese tetraoxide nanocomposite is prepared by one-step hydrothermal method, the reducing agent simultaneously reduces the two raw materials, and the method is simple and easy to operate.

The invention relates to an oxide of manganese and a preparation method thereof, in particular to a high-proportion manganous-manganic oxide and a preparation method thereof. The tap density of the high-proportion manganous-manganic oxide is at least 1.8g/cm<3>, and the specific surface area thereof is 1.5m<2>/g-3.0m<2>/g. The preparation method comprises the following steps of: directly introducing air into a manganese sulfate solution for oxidation, wherein the air flow is controlled to be 800L/h-2500L/h, the oxidation temperature is controlled to be 50-80 DEG C, and the stirring strength in the oxidation process is 75r/min-200r/min; dropwise adding ammonia water in the oxidation process so as to neutralize H<+> generated by oxidization reaction to make the pH value of a reaction system controlled to be 4.5-8.0; repeatedly rinsing manganous-manganic oxide slurry obtained after the reaction is completely ended by using pure water and then drying to obtain the high-proportion manganous-manganic oxide. The high-proportion manganous-manganic oxide not only has higher tap density, smaller specific surface area and even particle size distribution but also has low impurity content and low preparation cost.

The invention relates to an oxide of manganese, and in particular discloses high-purity trimanganese tetroxide and a preparation method thereof, wherein the Mn content in the high-purity trimanganese tetroxide is larger than 71.5 percent, and the S content is smaller than 0.03 percent. The preparation method thereof comprises the following steps of: 1. firstly dissolving high-purity manganese sulfate into water to obtain a manganese sulfate solution, then neutralizing the manganese sulfate solution with ammonia water, using the pH value of a neutralization system reaching 9.0-10.0 as the end point of a neutralization reaction, filtering, and rinsing to obtain a manganese hydroxide suspension; 2. introducing air into the manganese hydroxide suspension prepared in the step 1 at the temperature of 45-85 DEG C for oxidation, and filtering, rinsing and drying to obtain the high-purity trimanganese tetroxide after the manganese hydroxide in an oxidation system is completely converted into trimanganese tetroxide. The high-purity trimanganese tetroxide has the advantages of lower impurity content, good quality, controllable specific surface area, low preparation cost and the like.

The invention relates to a preparation method for manganese oxide nano rods, belonging to the field of nano function materials. According to the preparation method, rod-shaped alkaline manganese oxide can be prepared by using hypermanganate and ethylene glycol under a hydrothermal condition, wherein the longest length of the alkaline manganese oxide can be up to six microns and the diameter size is 10nm-130nm; alkaline manganese oxide precursors are calcined under different calcining conditions to obtain the manganese oxide nano rods with different valence states and different sizes, namely manganese dioxide nano rods, manganese sesquioxide nano rods and trimanganese tetraoxide nano rods. By adopting the preparation method, the problems of an existing solvothermal method that the reaction time is long and the reaction temperature is high when the alkaline manganese oxide nano rods are synthesized and the diameters of the products are great and the products are not uniformly distributed are solved; and the preparation method has the advantages of simplicity in operation and many product varieties.

The invention provides an MnZn ferrite material with high magnetic conductivity, which comprises the following main components: 50 to 54mol% of ferric oxide calculated by Fe2O3, 22 to 30mol% of trimanganese tetroxide calculated by MnO, 20 to 24mol% of zinc oxide calculated by ZnO and auxiliary components selected from at least four of TiO2, Co2O3, V2O5, Bi2O3, MoO3, SiO2 and CaCO3. In the MnZn ferrite material with high magnetic conductivity, which is provided by the invention, the initial magnetic conductivity is greater than 15000, the Curie temperature is greater than 120 DEG C, and the normal-temperature saturation magnetic induction strength is greater than 410mT. The invention also provides a manufacturing method of the MnZn ferrite material with high magnetic conductivity, which comprises the steps of mixing, drying, pre-sintering, ball milling, granulating, pressing, forming and sintering. The method provided by the invention has the advantages of simple process and low cost.

The invention discloses a method to produce high purity manganous-manganic oxide by manganese sulfate solution in ammonia medium. Adding ammonia into manganese sulfate solution that the concentration is 2g.L-1-120g.L-1, controlling the adding speed to make the pH value rising speed at 0-1.00/minute, using air or oxygen as oxidizing agent to oxide bivalent manganese into manganous-manganic oxide, the reaction temperature is 20-100 degree centigrade, controlling the highest pH value of the solution at the range of 6.0-14.0 in reacting process, and the lowest pH value range at 4.0-9.0. The invention has the advantage of fast reaction, the amount of precipitation of impurity calcium and magnesium could be controlled, and the yield of manganese would be improved, the cost is low.

The invention relates to a method for circularly producing mangano-manganic oxide by manganous sulfate, which fulfills the aim of circularly producing the mangano-manganic oxide by the manganous sulfate by absorbing a mixed gas of sulfur dioxide and sulfur trioxide generated by calcining the manganous sulfate at a high temperature by mixed slurry which is formed by pyrolusite (or manganese dioxide), manganese carbonate and water. The method for producing the mangano-manganic oxide has the advantages of low cost, high product purity, no pollution and the like.

The invention relates to a manganese zinc ferrite material and a preparation method thereof. The manganese zinc ferrite material comprises main components in mole percentage: 54-56 percent of ferric oxide, 38-42 percent of trimanganese tetraoxide and 4-6 percent of zinc oxide, and auxiliary components selected from at least five of CaCO3, SiO2, K2CO3, Y2O3, NiO, Co3O4 and Al2O3. The manganese zinc ferrite material is low in self-power loss in a (0.1-1) MHz wide frequency range.

The invention provides a method for preparing manganic manganous oxide nano-crystalline with controllable size and shape. aThe manganes source and organic coating agent are put into toluene to be heated and dissolved; water solution added alkaline matter is reacted for 10 minutes to 240 hours under a temperature ranging from 25 DEG C to 280 DEG C; the reaction is carried out under an atmospheric pressure or in an autoclave; under a heating condition, the manganese source is hydrolyzed; through the process of formation and growth of crystal nucleus, the manganic manganous oxide nano-crystalline coated by the organic ligand is formed finally. The method for preparing the total material of the invention is characterized by moderate reaction condition, simple and easy operation and short preparing period, thus, the preparation is easy to be enlarged. The prepared manganic manganous oxide nano-particle can disperse in non-polar organic solution. By regulating reaction time, reaction temperature, alkali amount, water amount and type of the organic coating agent, spherical, square and polygonal manganic manganous oxide nano-crystalline coated by the organic ligand of different sizes (3-50nm) can be compounded.

The invention relates to a wide-temperature low-distortion mangan zinc ferrite applicable to a broadband network transformer and a preparation method thereof. The mangan zinc ferrite mainly comprises the following components: 52.0 to 53.0 mol percent of iron oxide computed by Fe2O3, 21.0 to 23.0 mol percent of zinc oxide computed by ZnO, and the balance of trimanganese tetroxide, and also comprises the following auxiliary components in percentage by weight (wt %) computed by respective standard substance CaCO3, SiO2, V2O5 and Co2O3: 0.03 to 0.04 of CaCO3, 0.005 to 0.01 of SiO2, 0.01 to 0.03 of V2O5 and 0.03 to 0.1 of Co2O3. The mangan zinc ferrite is prepared by an oxide method and sintered under the condition of bell-type furnace densification. A product has higher initial magnetic permeability mu i, low relative loss factor tan delta/mu i, and wide-temperature low-magnetic hysteresis coefficient eta B (-40 to 85 DEG C), is capable of reducing waveform distortion, reducing transmission errors and prolonging transmission distance in the process of transmitting signals, and meets the requirement of the application in outdoor severe environment.

The invention relates to a preparation method for manganic manganous oxide. The method is as follows: in an enclosed reaction container, a manganese source with an average valence of manganese being less than 8/3 is placed in a reaction solution, the reaction is carried out with heating, the situation is kept that the pressure or partial pressure of oxidizing gases in the reaction system is more than or equal to 1 standard atmospheric pressure, and a crude product of manganic manganous oxide can be prepared after the reaction is completed. Optionally, the enclosed reaction container has an oxidizing gas inlet or has an oxidizing gas inlet and a generation gas outlet simultaneously. The oxidation reaction rate is raised, the oxidation reaction time is shortened, the manganic manganous oxide crystal growth integrality is raised, the crystal defect is reduced, and high purity and high quality are obtained.

The invention discloses a method for preparing trimanganese tetroxide by using rhodochrosite, comprising the following steps of: lixiviating the rhodochrosite by using a sulfuric acid solution to prepare a manganese sulfate solution; then purifying the manganese sulfate solution; then adding ammonia water to the purified manganese sulfate solution so that divalent manganese ions contained in the manganese sulfate solution generate manganese hydroxide precipitates; desulphurizing and washing the manganese hydroxide precipitates, and then oxidizing the washed manganese hydroxide precipitates by utilizing air or oxygen; and finally washing and drying to obtain a trimanganese tetroxide finished product. The preparation method not only has a simple process and low cost, but also has high purity and recovery rate and large specific surface area of a prepared product.

The invention provides a method for preparing electronic-grade selenium-free trimanganese tetroxide with rhodochrosite as raw material. The method uses the rhodochrosite as the raw material; a mixture of manganese hydroxide and manganese carbonate is obtained through a manganese leaching process and an impurity removing process; through washing, dehydration, drying, roasting, vacuum cooling technical treatment and refining treatment, the electronic-grade selenium-free trimanganese tetroxide with gamma-type atoms in disorderly arrangement can be obtained. As the low-grade rhodochrosite raw material used in the method is low in price, the method is low in production cost and high in product purity, and raises the utilization ratio of manganese ore resources. Compared with a method using electrolytic manganese as the raw material to produce trimanganese tetroxide, the method of the invention reduces equipment investment, production cost and power consumption respectively by 40 percent, 40 percent and 80 percent.

A spherical managanic manganeous oxide is created through the reaction among the aqueous solution of manganese salt with concentration 0.5-3 mol/liter, the alkaline aqueous solution with concentration 2-6 mol/liter and one, two or more than two aqueous solutions from ammonia, ethylene diamine, oxalic acid and citric acid create. With being washed and dried, spherical manganic manganous oxide is mixed with lithium hydroxide or lithium carbonate passing through the 700-800 deg.C heat treatment so as to obtain the product of spherical lithium manganate. The material prepared by the invention possesses the advantages of high specific capacity, 2.2-2.5 g/cm-3 tap density, improved cycling stability by adulterating other elements (for ex. Co, Cr) and has great application value.

The invention relates to a mesoporous manganese oxide nano material and a preparation method thereof. In the invention, a uniformly distributed mesopore with the aperture of 2 to 10 nanometers and a mixture of oxyhydrogen manganese oxide and manganic manganous oxide or a mangano-manganic octoxide monocrystal granule or a manganese sesquioxide monocrystal granule with the granule particle diameter controlled within the range of 20 to 80 nanometers are prepared by the hydrothermal function of manganese metal, manganese acetate and ammonia and the subsequent calcination control, and the uniformly distributed mesoporous, the mixture of oxyhydrogen manganese oxide and manganic manganous oxide, the mangano-manganic octoxide monocrystal granule and the manganese sesquioxide monocrystal granule play a catalytic action to a toluene combustion reaction. The invention has simple preparation method, loose synthesizing condition, easy repetition and cheap raw materials and can carry out large-scale production.

Synthesis of series nanometer lithium manganese oxide for lithium ion battery is carried out by taking mangano-manganic oxide or basic manganese oxide as precursor, hydrothermal reacting with excessive lithium hydrate in water or alcohol solution of autoclave, inserting lithium ion into lattice of manganese oxide, separating, washing and drying to obtain final product. It is simple and safe, has lower energy consumption, uniform granularity, better electrical performance and no environmental pollution.

The invention discloses a preparation method of a manganous-manganic oxide/graphene composite material. The preparation method comprises the following steps: mixing oxidized graphene, manganese sulfate and water together at room temperature, and stirring for 1-10 hours; adding potassium permanganate and continuing stirring for 1-10 hours; dropwise adding 30wt% of hydrogen peroxide, applying ultrasound for 1-10 hours; finally, dropwise adding hydrazine hydrate, and increasing the temperature to the range of 50-150 DEG C for reacting for 10-30 hours; carrying out suction filtration after the reaction is finished, washing the material filtered out with water and drying to obtain the manganous-manganic oxide/graphene composite material; the obtained manganous-manganic oxide/graphene composite material has the characteristics such as high capacity, good electrical conductivity, high cycling stability and good large current discharge performance, and thus being widely applied to the fields of high-performance lithium-ion batteries and the like as a lithium-ion battery anode material.

The invention discloses a reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method, which comprises: mixing a graphene oxide dispersion liquid and a single or mixed metal salt solution, completely mixing the obtained mixture and an amine substance, placing in a high temperature reaction kettle, carrying out a complete reaction at a certain temperature, soaking, and carrying out freeze drying treatment to directly prepare the graphene-metal oxide three-dimensional composite material having a self-supporting structure. According to the present invention, the reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material prepared through the preparation method can be directly used as the lithium ion battery positive electrode without the additional addition of the electric conduction agent and the binder, and has excellent cycle stability and excellent rate performance.

The invention belongs to the field of materials for lithium ion batteries, and discloses a nitrogen-doped carbon-coated manganous-manganic oxide composite material, as well as a preparation method andapplication thereof. The preparation method comprises the steps of dissolving manganese acetate and ammonium bicarbonate into ethylene glycol, carrying out solvent heat treatment at the temperature of 180 to 220 DEG C, and obtaining manganese carbonate; reacting with dopamine hydrochloride, and obtaining a manganese carbonate/polydopamine composite material; then calcining under an inert atmosphere, and finally oxidizing in a muffle furnace to obtain the nitrogen-doped carbon-coated manganous-manganic oxide composite material. The preparation method provided by the invention is simple and lowin cost; the prepared nitrogen-doped carbon-coated manganous-manganic oxide composite material is stable in structure and good in electrical conductivity, and has excellent rate performance and cyclic stability when being used as a lithium ion battery cathode material.

The invention relates to a method for preparing manganous manganic oxide, belonging to the technical field of chemical production. The technical problem to be solved by the invention is to provide a method for preparing manganous manganic oxide with low production cost. The method comprises the following steps of a, adding manganous hydroxide and potassium permanganate in solvent, mixing the mixtures, and reacting the obtained slurry at 100-200 DEG C for 2-6 h, wherein the dosage of potassium permanganate is as 10-100 percent of a theoretical dosage through which the manganous hydroxide can be oxidized as the manganous manganic oxide; the solvent is mixed solution of ammonium chloride, ammonia and ethanol; the concentration of the NH4Cl in the mixed solution is 5-50 g/L; the concentration of the NH3 H2O in the mixed solution is 5-50 g/L; and the volume concentration of the ethanol in the mixed solution is 10-90 percent; b, cooling the reactant, filtering and washing the cooled reactant with ions for several times, and then filtering and washing the reactant with ethanol; and c, drying the product which is filtered and washed by step b to obtain the manganous manganic oxide.

The invention relates to a preparation method of mangano-manganic oxide, belonging to the technical field of inorganic non-metallic material, wherein the purified manganese ore extract, manganese sulfate solution, is used as raw material; carbonate (bicarbonate) is used as precipitating agent; the manganese ion in the manganese sulfate solution is precipitated into manganese carbonate sediment, which is then thermal oxidized and decomposed into a manganese admixture containing manganese dioxide, manganese monoxide and manganese carbonate with air or oxygen at a temperature of 120 DEG C to 800 DEG C, and then calcined into mangano-manganic oxide at a temperature of 800 DEG C to 1200 DEG C. The invention has the advantages that the dust cloud of manganese admixture is practically avoided during the process of preparation; the recovery rate of manganese is high; the obtained mangano-manganic oxide has dramatic activity and the cost is low.

The invention discloses a preparation method of a manganic manganous oxide/ carbon matrix composite nanoelectrode material. The method comprises the following steps: preparing a spinning solution by taking polyacrylonitrile (PAN) as a precursor, taking manganese acetate as an additive, and taking N,N-dimethyl formamide as a solvent; preparing a Mn/PAN composite nanofiber via an electrostatic spinning method; and performing drying, pre-oxidation and carbonization of the obtained fiber to obtain the manganic manganous oxide/ carbon composite nanofiber material. The method has advantages of simple process, high spinning controllability, and easy adjustable structure of the fiber, and the prepared manganic manganous oxide/ carbon composite nanofiber material can be directly used as an electrode material of a super capacitor without adding a conductive agent or a binding agent. The obtained composite electrode is high in utilization ratio of an active material and mechanical strength, and relatively stable in chemical property, and is an ideal material for preparing the super capacitor.

The invention relates to a laminated chip type negative temperature coefficient thermistor and a preparation method thereof. The thermistor uses trimanganese tetroxide, tricobalt tetroxide, nickel trioxide and silicon dioxide as raw materials, and the raw material powder is mechanically The negative temperature coefficient thermal fine powder is synthesized by ball milling method, and then the laminated chip negative temperature coefficient thermistor can be obtained by tape casting (ribbon casting), sintering and coating metal electrode technology, and the obtained laminated negative temperature coefficient thermistor The temperature coefficient thermistor is small in size and high in precision. Its material constant B value is 4030-4105, and the allowable deviation of B value is ±1%. KΩ.