54results about "Mangesium aluminates" patented technology

The invention provides a dolomite roasting method, a carbonization method, a calcium-magnesium separation method and a comprehensive utilization method. The comprehensive utilization method of dolomite comprises the following steps: performing dolomite roasting on dolomite powder to obtain calcined powder; sequentially carrying out digestion treatment and aging treatment on the calcined white powder to obtain an aging solution; carrying out carbonization treatment on the aging solution to obtain a carbonization reaction solution; carrying out solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid isolate; carrying out pyrolysis treatment on the heavy magnesium water to obtain pyrolysis reaction liquid; carrying out solid-liquid separation on the pyrolytic reaction liquid to obtain decomposition liquid and a second solid isolate; carrying out magnesium carbonate roasting on the second solid isolate to obtain magnesium oxide; and carrying out reduction treatment on the magnesium oxide to obtain magnesium metal and magnesium aluminate spinel. According to the invention, comprehensive utilization of dolomite resources is realized, no waste residue or waste gas is discharged, a main product is magnesium metal, and byproducts are light calcium carbonate, magnesium aluminate spinel and solid carbon dioxide.

The invention relates to the technical field of preparation methods of nano precursor powder, in particular to a synthesis method of Cr < 3 + > doped magnesium aluminum oxide nano powder, which comprises the following steps: weighing magnesium nitrate, aluminum nitrate and chromic nitrate according to the stoichiometric ratio of MgAl2-xO4: xCr < 3 + >; stirring and mixing the prepared magnesium nitrate solution, aluminum nitrate solution and chromic nitrate solution together to prepare a mixed solution I; ammonia water is dripped into the first mixed solution, then the first mixed solution dripped with the ammonia water is stirred and mixed, and a second mixed solution is prepared; pouring the mixed solution II into a high-pressure reaction kettle, and putting the high-pressure reaction kettle into a constant-temperature box for reaction to prepare a white precipitate; adding deionized water into the white precipitate for washing and precipitating, and centrifuging to obtain white precipitate powder; drying the white precipitate powder at a constant temperature; calcining the dried white precipitate powder to prepare nano precursor powder; the prepared nanometer precursor powder has the advantages of being high in purity and small in particle size.

The invention relates to a fast ion conductor-stabilizer composite coated lithium manganese iron phosphate material as well as a preparation method and application thereof. The lithium manganese iron phosphate material comprises a lithium manganese iron phosphate inner core and a coating layer on the surface of the lithium manganese iron phosphate inner core, the coating layer is obtained by mixing sodium aluminosilicate, magnesium metaaluminate, a coating carbon source and a lithium supplement agent, coating the surface of the lithium manganese iron phosphate inner core with the mixture, and performing sintering treatment. According to the invention, sodium aluminosilicate and magnesium metaaluminate are combined with conductive carbon to carry out co-coating treatment on lithium manganese iron phosphate, and in a high-temperature sintering process, part of Na < + > / Al < 3 + > / Mg < 2 + > multi-ions are co-embedded into a near surface layer of a lithium manganese iron phosphate crystal, so that a unit cell structure which is more stable in structure and easier in Li < + > diffusion is formed. In the high-temperature sintering process, part of magnesium metaaluminate reacts with the lithium supplement agent to form an Al-based fast ion conductor, and sodium aluminosilicate has a wider Li < + > diffusion channel, so that the material has excellent rate capability.

The invention provides nano magnesium aluminate spinel with high sintering activity and high dispersity and a preparation method thereof, and belongs to the field of nano material preparation. The method comprises the following steps: mixing aluminum chloride, magnesium chloride and deionized water to obtain a mixed solution; adding aluminum bicarbonate into the mixed solution, and carrying out hydrothermal reaction, so that aluminum hydroxide and magnesium hydroxide are precipitated at the same time to obtain a magnesium aluminate spinel precursor; the magnesium aluminate spinel precursor is subjected to first-stage roasting, so that the magnesium aluminate spinel precursor is subjected to flash pyrolysis to form a fine crystal nucleus, and a pyrolysis product is obtained; and performing second-stage roasting on the pyrolysis product to control the crystal nucleus of the pyrolysis product to grow along a specific crystal face, thereby obtaining the nano magnesium aluminate spinel powder. A nanoscale precursor is precisely regulated and controlled to be controllably and orderly separated out through a wet-process system micro-area reaction; the crystal form development, the microstructure and the size uniformity of the powder are controlled through a flash pyrolysis nucleation-crystal face oriented growth two-stage roasting technology.

The purpose of the present invention is to provide: a highly pure metal composite oxide having excellent thermal conductivity and dielectric characteristics; and a method for efficiently producing said metal composite oxide. Specifically, the present invention is characterized by the use of spinel particles including at least magnesium atoms, aluminum atoms, and oxygen atoms, wherein the quantity of atoms other than said atoms is less than 0.27 at% and / or the number of calcium atoms relative to the sum of the number of magnesium atoms and aluminum atoms is less than 0.02 at%.

The invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an erosion surface of a waste sagger. Therefore, it is expected that by means of the method for preparing the high-purity lithium sulfate from the waste saggar, the high-purity lithium sulfate capable of being used for preparing the lithium secondary battery can be prepared by recycling the waste saggar; and moreover, positive active materials, iron oxide, aluminum oxide, silicate and calcium carbonate which are additionally obtained in the preparation process can be recycled.

A manufacturing apparatus (1A) includes a first gas introduction portion (20) provided on one end portion (10a) side of a calcination furnace (10) to introduce a gas into the calcination furnace (10), a gas discharge portion (30) provided on the other end portion (10b) side of the calcination furnace (10) to discharge the gas in the calcination furnace (10) to the outside, and a conveying apparatus (40) to convey a metal compound and a flux from the gas discharge portion (30) side to the first gas introduction portion (20) side. The calcination furnace (10) has a temperature increasing region (12A), a cooling region (14A), and a reaction region (13A) provided between the temperature increasing region (12A) and the cooling region (14A) and causing the metal compound and the flux to react. In the manufacturing apparatus (1A), a gas flow (AF1) generated by the gas introduced from the first gas introduction portion (20) causes the flux gasified in the reaction region (13A) to be powdered in the cooling region (14A), and the gas containing the powdered flux is sent to the gas discharge portion (30).

The invention belongs to the technical field of inorganic luminescent materials, and particularly relates to a preparation method of a Mn < 4 + >-doped magnesium aluminum salt red luminescent material containing Lewis acid sites. The method comprises the following steps: preparing a precursor solution according to a chemical formula MgAl (2-x) MnxO4, and carrying out a co-precipitation reaction to generate a precipitate; sequentially carrying out preheating and high-temperature calcination to form a matrix; then activating through Na < + > exchange and H < + > exchange, directionally introducing oxygen vacancies and exposing Al3 < + > octahedral sites, and cooperatively regulating 2E-4A2 red light transition of Mn < 4 + >. The obtained material has excellent thermal stability, is suitable for blue light excited warm white light LED with high color rendering index and low color temperature, and solves the technical defects of insufficient oxygen vacancy and uncontrollable coordination environment of the traditional red light material. The ion exchange method disclosed by the invention solves the problem that the luminescence application is limited due to the fact that Mn < 2 + > is doped through a high-temperature solid-phase method in the prior art, the oxygen vacancy concentration is low, Lewis acid sites are insufficient, and the local coordination environment of Mn < 4 + > cannot be accurately regulated and controlled. The preparation method is simple and easy to operate, and the product is stable in luminescence.

The present invention relates to a modified layered double hydroxide (LDH), particles comprising said modified LDH, a resin composition comprising a resin and said particles, a dispersion comprising a liquid and said particles, and a method for producing said modified LDH. The modified layered double hydroxide according to the present invention comprises a modified layered double hydroxide according to formula (I) [[[M12 +] y (M22 +) z] 1-x [M33 +] x (OH) 2] (An-) x / n.mH2O (I) wherein: M1 and M2 are each independently a divalent metal selected from the group consisting of Mg, Zn, Ca, Sr, Cu, Fe, Mn, Co, Ni, Sn, Pb, Cd and Ba; a divalent metal, in particular each independently selected from the group consisting of Mg, Zn, Cu, Fe, Mn, Co, Ni and Cd; m3 is a trivalent metal such as Al and / or Fe; in particular Al; and An-is one or more intercalated n-valent anions, wherein m, x, y and z are values within the range represented by: 0 < = mlt; 2, 0lt; x < = 0.5, 0.5 < = y + z < = 1, the modified layered double hydroxide according to the invention further comprising a modified outer layer wherein the outer layer is modified with an organic acid derivative or a salt thereof.

A method for treating an acid exhaust gas having a first step of treating an acidic gas in an acid exhaust gas with a OH-type Mg-Al layered double hydroxide, an equipment for treating an acid exhaust gas having means for performing the method for treating, and an incineration facility having the equipment for treating.

The utility model provides a system for preparing magnesium-aluminum spinel from secondary aluminum ash, which comprises a reaction system, a storage system and a filtering system, the reaction system comprises a hydrolysis tank, an alkali washing tank, an acid washing tank and a calcining furnace, the storage system comprises a first storage tank, a second storage tank and a third storage tank, and the filtering system comprises a filter press; the hydrolysis pool and the alkaline washing pool are both connected with a feeding port of the filter press through an input pipe, a liquid outlet of the filter press is connected with the first storage tank and the third storage tank through an output pipe, the input pipe and the output pipe are both Y-shaped pipes, two branch pipes of the input pipe are connected with the first draw-off pump and the second draw-off pump respectively, and the first draw-off pump is connected with the second draw-off pump. Two branch pipes of the output pipe are fixedly connected with the first storage tank and the third storage tank in a sealed mode respectively, secondary aluminum ash difficult to treat is recycled through the system, by-products obtained after reaction are all safe substances, and recycling of the secondary aluminum ash is achieved under the condition that environmental pollution is solved.

To provide a method for generating particles with generally uniform size and uniform thermal history for a variety of applications.SOLUTION: There is disclosed herein a method to produce multiphase composite materials directly from solution precursor droplets by a fast pyrolysis process using a microwave plasma embodiment containing a microwave generating source 1, a dielectric plasma torch 3, and a droplet maker 4. Here, using homogenous solution precursors, droplets are generated with a narrow size distribution, and are injected and introduced into the microwave plasma torch with generally uniform thermal path. The generally uniform thermal path in the torch is achieved by axial injection of droplets into an axisymmetric hot zone with laminar flows. Upon exposing to high temperature within the plasma with controlled residence time, the droplets are pyrolyzed and converted into particles by quenching with a controlled rate of the exhaust gas in a gas chamber. The particles generated have generally uniform sizes and uniform thermal history, and can be used for a variety of applications.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of asbestos tailing utilization, and particularly discloses an asbestos tailing full-resource utilization process. The method provided by the invention comprises the following steps: crushing and sieving asbestos tailings, adding a sulfating roasting reagent and ammonium bisulfate to obtain a mixed material, and roasting the mixed material in a fluidized bed; after heat preservation treatment, water is added for a leaching reaction, and leaching residues and filtrate are obtained through solid-liquid separation; adjusting the pH value of the filtrate to obtain a mixed precipitate of ferric hydroxide and nickel hydroxide and a sulfate solution, performing evaporative crystallization on the sulfate solution, and performing roasting treatment to obtain a mixed oxide; and adding aluminum powder into the mixed oxide, and carrying out aluminothermic reduction reaction to obtain the magnesium ingot. According to the method, high-valued utilization of various elements in the asbestos tailings can be achieved, circular economy and closed-loop utilization can also be achieved, and the economic effect of enterprises is improved.

In accordance with the purpose(s) of the present disclosure, as embodied and broadly described herein, the disclosure, in one aspect, relates to solid oxide electrolytes and the low-temperature synthesis of solid oxide electrolytes. The electrolytes have the general formula LixMgMOy and have relatively high ionic conductivity and relatively good chemical stability. The electrolytes can be a component of different types of batteries. The process of synthesizing the electrolytes can be done under moderate conditions with cost-effective materials, which is useful for large-scale production.

This invention provides a method for calcining dolomite, a carbonization method, a calcium-magnesium separation method, and a comprehensive utilization method. The comprehensive utilization method of dolomite includes: calcining dolomite powder to obtain calcined white powder; subjecting the calcined white powder to digestion and aging treatments sequentially to obtain an aging liquid; carbonizing the aging liquid to obtain a carbonization reaction liquid; performing solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid separate; pyrolyzing the heavy magnesium water to obtain a pyrolysis reaction liquid; performing solid-liquid separation on the pyrolysis reaction liquid to obtain a decomposition liquid and a second solid separate; calcining the second solid separate with magnesium carbonate to obtain magnesium oxide; and reducing the magnesium oxide to obtain metallic magnesium and magnesium aluminum spinel. This invention achieves comprehensive utilization of dolomite resources, with no waste residue or exhaust gas emissions. The main product is metallic magnesium, and the by-products are light calcium carbonate, magnesium aluminum spinel, and solid carbon dioxide.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on the eroded surface of a waste refractory crucible to be discarded. Therefore, by using the method for producing high-purity lithium sulfate from the waste refractory crucible of the present invention, not only can the discarded waste refractory crucible be reused to produce high-purity lithium sulfate that can be used in the production of lithium secondary batteries, but it is also expected that the positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained incidentally in the production process can be reused.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

The invention relates to a preparation method of high-purity magnesium aluminate spinel powder and the high-purity magnesium aluminate spinel powder. The preparation method comprises the following steps: S1, weighing raw materials in percentage by mass, wherein the raw materials comprise 65-80% of magnesium oxide powder and 20-35% of aluminum powder; s2, adding fluoride accounting for 1-10% of the mass of the raw materials into the raw materials, mixing, stirring and grinding uniformly to obtain a mixture; s3, pressurizing and pressing the mixture into a solid blank; s4, the solid blank is subjected to a calcination reaction for 1-4 h at the temperature of 900-1500 DEG C in a vacuum environment, and a sintered blank is obtained; and S5, cooling the sintered blank to room temperature, and crushing to obtain the high-purity magnesium aluminate spinel powder. The preparation method provided by the invention is based on a low-temperature solid-phase reaction between several raw materials and the fluoride, and by controlling specific reaction parameters, the preparation method is simple, the roasting temperature is low, the dosage of the fluoride is small, and the obtained magnesium aluminate spinel powder is relatively high in phase purity and small and uniform in particle size.

The plate-like spinel particles have a thickness (T) of 0.01 μm or more and 5 μm or less, an average particle diameter (L) of 0.1 μm or more and 500 μm or less, an aspect ratio (L / T) of 3 or more and 500 or less, and contain molybdenum within the particles. The method for producing the plate-like spinel particles comprises calcining a magnesium compound and an aluminum compound in the presence of molybdenum.

A system and method for continuous production of Mg from metallothermic reduction of magnesium bearing ore from both the reactor side and condenser side of the system, using a separate collection vessel. The furnace is a heated tube through which a moving bed of tableted feed flows. The condenser is a common heat exchanger design (shell / tube, plate / plate, etc.) and uses a heat transfer liquid to cool and condense magnesium gas under vacuum or pressure conditions. The cooling medium can be molten salts or metals which are not in direct contact with the magnesium metal. Liquid magnesium flows from the condenser into a collection vessel for further processing. Continuous operation is achieved by supplying a constant feed of tablets into the furnace, producing a constant stream of Mg gas to the condenser. Magnesium liquid product is tapped periodically from the collection vessel.

This invention relates to a doped yttrium oxide flake powder, its preparation method, and its applications. The method uses 0.2-0.4 M Y(NO₃)₂. 3 ) 3 ·6H 2 O solution as Y 3+ Source, then add MgCl to the solution 2 and Al(NO 3 ) 3 ·9H 2 O was used as a dopant. After adjusting the pH of the mixed solution to 8-10, a hydrothermal reaction was carried out at 170-200°C for 9-15 hours to achieve uniform distribution of the dopant in the yttrium oxide lattice. Finally, the powder was calcined at 600-700°C for 3-5 hours to improve the structural stability and properties of the material. The synthesized doped yttrium oxide powder had a plate-like morphology with a particle size between 5-25 micrometers, and the final product composition included Y. 2 O 3 MgAl 2 O 4 And Y-Al-O compounds. Compared with traditional physical doping methods, the preparation method of this invention not only achieves a more uniform doping effect, but also shows significant advantages in terms of energy consumption, cost, and particle size control. The doped yttrium oxide obtained by this method has performance superior to or equivalent to high-purity yttrium oxide, providing a new avenue for the further application and development of yttrium oxide.

The present invention relates to the technical field of fire-resistant wall materials and discloses a method for preparing a fire-resistant wall material that can automatically decompose formaldehyde, comprising the following steps: (1) mixing MgO and Al2O3, subjecting the mixture to ball milling, ultrasonic treatment, and heating reaction to obtain a porous precursor; (2) mixing the porous precursor with nano-LiF and calcining the mixture under nitrogen protection to obtain a calcined product; (3) loading the calcined product with titanium dioxide nanotubes through a coupling reaction to obtain a fire-resistant wall material. The present invention utilizes the excellent fire-resistant properties of spinel materials and, through the loading of titanium dioxide nanotubes, enables the wall material to catalytically decompose toxic and hazardous substances such as formaldehyde and benzene; by first synthesizing the porous precursor and then adding nano-LiF, the calcination time is greatly shortened and energy loss is reduced while meeting the material properties.

This invention provides a method for surface modification of lithium-rich manganese-based cathode materials, comprising: (1) dissolving a polymer with multiple carboxyl functional groups in deionized water to obtain a coating agent aqueous solution of 0.1–10 mg / mL; (2) dissolving a soluble inorganic salt containing a modified metal element in deionized water to obtain a metal precursor solution; (3) uniformly dispersing the lithium-rich manganese-based cathode material in the coating agent aqueous solution, and then adding the metal precursor solution, or mixing the coating agent aqueous solution and the metal precursor solution before uniformly dispersing the lithium-rich manganese-based cathode material therein; (4) washing and filtering the reactants obtained in step (3), and then heat-treating them under an oxygen-free atmosphere to form a metal ion gradient doping in the lithium-rich manganese-based cathode material, and forming a metal oxide layer, a spinel phase, and a carbon layer sequentially from the inside to the outside on the surface of the lithium-rich manganese-based cathode material. This invention improves the comprehensive electrochemical performance of the modified lithium-rich manganese-based cathode material.

A method for producing spinel-type aluminum oxide using a water-in-oil Pickering emulsion is provided. [Solution] The method includes the steps of: (1) mixing an aqueous dispersion of boehmite alumina sol with an aqueous solution containing one of the metal species Ni, Co, or Mg; (2) mixing a water-insoluble organic solvent with the aqueous solution from step (1) to form a phase-separated state of aqueous phase and organic solvent phase; (3) forming a water-in-oil (W / O) Pickering emulsion by applying shear to the entire liquid in the phase-separated state from step (2) to produce a spinel precursor in the organic solvent phase; (4) allowing the sheared liquid to stand to separate into an aqueous phase and an organic solvent phase; (5) removing the organic solvent phase from the phase-separated liquid from step (4); (6) drying the organic solvent phase from step (5) to obtain a cake; (7) baking the cake from step (6) at 700 to 1200°C for 2 to 8 hours; and (8) pulverizing the baked product obtained from step (7).

The present invention provides a calcium-based composite heat storage material and a preparation method thereof. The calcium-based composite heat storage material includes a calcium-based material and an aluminum spinel-type material, wherein the calcium-based material is calcium oxide or calcium carbonate. The preparation method includes a solid-phase doping method, in which the aluminum spinel-type material is prepared by a sol-gel method, and then the aluminum spinel-type material is mixed with calcium carbonate powder and heat-treated and carbonated to obtain a calcium-based composite heat storage material; or the calcium-based composite heat storage material is synthesized in one step by a sol-gel method. The composite heat storage material of the present invention utilizes the stability of the aluminum spinel-type material, and can effectively improve the problem of sintering failure of the calcium-based heat storage material. The preparation method of the present invention is simple, low-cost, and easy to operate, and while achieving high energy storage density, it improves the stability of the heat storage material.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

Disclosed is a ceramic sintered body comprising magnesium aluminate spinel of composition MgAl2O4 having from 90 to 100% by volume of a cubic crystallographic structure and a density of from 3.47 to 3.58 g / cc, wherein the ceramic sintered body is free of sintering aids. A method of making the ceramic sintered body comprising spinel is also disclosed.

This invention relates to a fast-ion conductor-stabilizer composite-coated lithium manganese iron phosphate material, its preparation method, and its applications. The lithium manganese iron phosphate material of this invention comprises a lithium manganese iron phosphate core and a coating layer on its surface. The coating layer is obtained by coating the surface of the lithium manganese iron phosphate core with a mixture of sodium aluminosilicate, magnesium aluminate, a carbon source, and a lithium supplement, followed by sintering. This invention utilizes sodium aluminosilicate and magnesium aluminate combined with conductive carbon for co-coating lithium manganese iron phosphate, achieving partial Na+ ionization during high-temperature sintering. + / Al 3+ / Mg 2+ Multiple ions are co-intercalated into the near-surface layer of lithium manganese iron phosphate crystals, thereby forming a more stable structure and Li + A cellular structure that facilitates diffusion. During high-temperature sintering, some magnesium aluminate reacts with the lithium supplement to form an Al-based fast ion conductor, coupled with the wider Li-ion diffusion of sodium aluminosilicate. + The diffusion channels give the material excellent rate performance.

A method of manufacturing a nanocomposite may include combining a magnesium salt, an aluminum salt, and a manganese salt in stoichiometric proportions within 5 mol. % in an aqueous solvent including menthol or dextrose, to obtain a first mixture. The method further may include heating the first mixture to remove at least 99.5 percent by weight (wt. %) of the aqueous solvent to obtain a first solid, grinding the first solid into a first powder, calcining the first powder at a temperature of about 600 to 800° C. for a time of about 2 to 4 hours to obtain a second solid, grinding the second solid and urea, into a second powder, heating the second powder at a temperature of about 550 to 650° C. for a time of about 15 minutes to 1.5 hours to obtain the nanocomposite.

A manufacturing device includes a first gas inlet that is disposed closer to a first end of a firing furnace and introduces gas into the firing furnace, a gas outlet that is disposed closer to a second end of the firing furnace and discharges gas inside the firing furnace to the outside, and a transport device that transports a metal compound and a flux from a point closer to the gas outlet to a point closer to the first gas inlet. The firing furnace has a heating region, a cooling region, and a reaction region that is defined between the heating region and the cooling region and in which the metal compound and the flux react. The manufacturing device utilizes airflow generated by the gas introduced through the first gas inlet to convert the flux vaporized in the reaction region into powder in the cooling region and to deliver gas containing the powder of the flux to the gas outlet.