24results about "Magnesium compounds" patented technology

The present invention provides a negative electrode material comprising a Mg(O) / C composite, which is a carbide of Mg-MOF-74 (magnesium-based metal-organic framework-74), wherein O is present or absent, a negative electrode comprising the negative electrode material, a lithium-ion secondary battery comprising the negative electrode, and a method for producing the Mg(O) / C composite.

The application discloses a sodium-ion layered positive electrode material, a preparation method and a positive electrode sheet. + , H + , F ‑ of a lithium-ion battery core recovery liquid; a sodium source and the lithium-ion battery core recovery liquid are prepared into a solution; (2) a sodium-ion layered positive electrode material is mixed into the solution to prepare a mixed slurry; (3) the mixed slurry is subjected to suction filtration and drying to obtain a precursor powder; and (4) the precursor powder is sintered to obtain the sodium-ion layered positive electrode material. The application overcomes the defects of poor cycle performance and unstable surface of the sodium-ion layered positive electrode material.

A cathode composition for a battery has the general formula Mg1+xMn1-xO2; wherein the value of x is greater than 0 and less than 1. Preferably, x ≤ 0.3, and most preferably the composition comprises M

A system for the synthesis of magnetoelectronically tunable spinel ferrite nanoparticles, comprising: a) a precursor preparation unit for the preparation of a homogeneous nitrate precursor solution, wherein the precursor preparation unit facilitates the dissolution of stoichiometric amounts of magnesium nitrate hexahydrate, nickel nitrate hexahydrate, iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate in deionized water; b) a fuel mixing unit configured to introduce a binary mixture of urea and glucose into the dissolved homogeneous nitrate solution in a fuel-oxidant ratio that achieves fuel equivalence; c) a gel formation unit configured to maintain the temperature at 70-80 °C under continuous stirring to convert the fuel mixture into a viscous gel; d) a combustion unit comprising a preheated muffle furnace maintained at 450 ± 10 °C and enabling the initiation of a self-propagating combustion reaction; and e) a calcination plant configured for the thermal treatment of crushed precursor ash at 600 °C for 2 hours and subsequently at 750 °C for 2 hours to produce phase-pure cubic spinel Mg 1-x Ni x To produce FeCrO4 nanoparticles.

A structure (1) comprises a base material (10) that contains a continuous phase (11) of a polycrystalline body of a complex fluoride containing an alkali metal. The structure (1) contains at least 85 mass% of an inorganic substance, and the structure (1) contains at least 50 mass% polycrystalline body of a complex fluoride. The porosity of the structure (1) is 30% or less, the median value of the pore diameter of the structure (1) is 500 nm or less, and the thickness of the structure (1) is 10 μm or thicker.

To provide a manufacturing method of a positive electrode active material of a lithium ion secondary battery.SOLUTION: A method for manufacturing a positive electrode active material includes a first step of placing a first container containing a mixture of a lithium oxide, a fluoride, and a magnesium compound in a heating furnace, a second step of making the inside of the heating furnace an atmosphere containing oxygen, and a third step of heating the inside of the heating furnace, in which the third step is performed after the first step and the second step are performed. Before the inside of the heating furnace is heated, the atmosphere in the heating furnace is preferably made to contain oxygen. More preferably, the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.SELECTED DRAWING: Figure 1

To create a fire protection material with improved cooling properties, easier handling and processing, and more cost-effective production, magnesium phosphate hydrate, such as magnesium phosphate octahydrate, is used as an ablative fire protection material (20) or in an ablative fire protection material (20) for fire protection purposes according to the invention. In one embodiment, a composition for forming an ablative fire protection material (20) containing 55 wt% to 80 wt% magnesium phosphate hydrate (12), 20 wt.% to 40 wt.% carrier material (10), and 1 wt.% to 20 wt.% of a crust-forming material (14). in an extruder (16) to form a flexible strand of ablative fire protection material (20), in particular to form a flexible sheet (22).

The application belongs to the field of water treatment equipment and application technology, and particularly relates to a selective electrodialysis device and application thereof. The selective electrodialysis device comprises an electrodialysis cell, an anode and a cathode arranged on the two sides of the electrodialysis cell, and a cation exchange membrane and an anion exchange membrane arranged between the anode and the cathode in sequence. The cation exchange membrane is made of sulfonated polybenzimidazole as a base material, and the surface of the cation exchange membrane is coated with polystyrene sodium sulfonate containing porous micro-nano materials. A protective layer containing polydiphenylpiperidine is coated on the side of the cation exchange membrane facing the anode. The anion exchange membrane is made of quaternary amine polyfluorosulfone or polyether sulfone as a base material, and the surface of the anion exchange membrane is coated with polydimethyl diallyl ammonium chloride. The device can efficiently separate monovalent ions and polyvalent ions, the functionalization of the ion exchange membrane increases the membrane charge density, promotes the rapid migration of ions under the action of an electric field, and improves the ion transfer rate. The device is stable in operation, has a high separation rate and a high current efficiency.

Provided is a structure (1), including: a base material (10) that includes a continuous phase (11) of a polycrystalline substance of a complex fluoride including an alkali metal, wherein the structure (1) includes an inorganic substance in an amount of 85% by mass or more, the structure (1) includes the polycrystalline substance of the complex fluoride in an amount of 50% by mass or more, the structure (1) has a porosity of 30% or less, the structure (1) has a median pore size of 500 nm or less, and the structure has a thickness of 10 µm or more.

This apparatus for producing complex fluoride particles comprises: a mixer for mixing a first solution in which a first compound that is an alkali metal fluoride is dissolved, a second solution in which a second compound having a metal element different from the alkali metal element contained in the alkali metal fluoride is dissolved, and a third solution in which a third compound that reacts with hydroxide ions to produce water is dissolved, thereby producing a mixed solution containing the complex fluoride particles; a pH detection unit for measuring the pH value of the mixed solution, which changes as water is produced; and an estimation unit for estimating the particle size of the complex fluoride particles according to the pH value.

A method for forming a positive electrode active material of a lithium ion secondary battery is provided. The method for forming a positive electrode active material includes a first step of placing a first container in which a mixture of a lithium oxide, a fluoride, and a magnesium compound are put, in a heating furnace, a second step of providing an atmosphere including oxygen in an inside of the heating furnace, and a third step of heating the inside of the heating furnace. The third step is performed after the first step and the second step are performed. Preferably, an atmosphere including oxygen is provided in the heating furnace before the inside of the heating furnace is heated. More preferably, the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.

To provide a method for manufacturing a positive electrode active material of a lithium ion secondary battery.SOLUTION: A method for manufacturing a positive electrode active material includes: a first step of placing in a heating furnace, a first container in which a mixture of a lithium oxide, a fluoride and a magnesium compound is put; a second step of bringing the inside of the heating furnace into an oxygen containing atmosphere; and a third step of heating the inside of the heating furnace. The first step and the second step are executed and then, the third step is executed. It is preferable that the inside of the heating furnace is brought into the oxygen containing atmosphere before heating the inside of the heating furnace. It is more preferable that the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.SELECTED DRAWING: Figure 1

A positive electrode active material comprises secondary particles, wherein each of the secondary particles includes primary particles, and each of the primary particles includes an olivine-type phosphate compound and lithium zirconate.

The invention discloses a method for recycling magnesium in a rare earth element leaching process, which comprises the following steps of: 1) mixing and leaching minerals after the rare earth ores are subjected to sulfation decomposition with water to obtain primary leachate and primary leaching residues; (2) mixing the primary leachate with a magnesium neutralizer, and carrying out neutralization reaction to obtain primary purified liquid and neutralized slag; 3) adding a magnesium precipitant into the primary purified liquid, and carrying out precipitation reaction to obtain a primary magnesium sulfate solution and a rare earth precipitate; (4) the primary magnesium sulfate solution and the primary leaching residues are leached, and secondary leaching liquid and secondary leaching residues are obtained; and (5) returning the secondary leaching solution to the step (2) to serve as the primary leaching solution in the step (2), and repeating the steps (2)-(3) to obtain a secondary magnesium sulfate solution, rare earth precipitates and neutralization residues. According to the method, cyclic utilization of the magnesium element is achieved, and the leaching rate of rare earth elements is increased while transformation wastewater discharge is reduced.

The present invention relates to poly(melamine-silicate) derivatives as biocidal disinfection and decontamination agents, and to methods for their production and use. More specifically, the invention relates to halogenated adducts of poly(melamine- silicate) with metal oxides.

To create a fire protection material with improved cooling properties, easier handling and processing, and more cost-effective production, magnesium phosphate hydrate, such as magnesium phosphate octahydrate, is used as an ablative fire protection material (20) or in an ablative fire protection material (20) for fire protection purposes according to the invention. In one embodiment, a composition for forming an ablative fire protection material (20) containing 50 wt% to 80 wt% magnesium phosphate hydrate (12), 20 wt.% to 40 wt.% carrier material (10), and 1 wt.% to 20 wt.% of a crust-forming material (14) is extruded in an extruder (16) to a flexible strand of ablative fire protection material (20), in particular to a flexible sheet (22).

The present invention provides a negative electrode material comprising a Mg (O) / C composite which is a carbide of Mg-MOF-74 (magnesium-based metal-organic framework-74) in which O is present or absent, a negative electrode comprising the negative electrode material, a lithium ion secondary battery comprising the negative electrode, and a method for manufacturing the Mg (O) / C composite.

The invention belongs to the technical field of water treatment equipment and application, and particularly relates to a selective electrodialysis device and application thereof. The selective electrodialysis device comprises an electrodialysis tank, an anode and a cathode are respectively arranged on two sides of the electrodialysis tank, and a cation exchange membrane and an anion exchange membrane are sequentially arranged between the anode and the cathode; wherein the cation exchange membrane takes sulfonated polybenzimidazole as a base material, and the surface of the cation exchange membrane is coated with sodium polystyrenesulfonate containing a porous micro-nano material; one surface, facing the anode, of the cation exchange membrane is coated with a protective layer containing polybiphenylpiperidine; the anion exchange membrane takes quaternized polysulfone or polyether sulfone as a base material, and the surface of the anion exchange membrane is coated with poly dimethyl diallyl ammonium chloride. The device can efficiently separate monovalent ions and multivalent ions, functionalizes the ion exchange membrane to increase the charge density of the membrane, promotes rapid migration of the ions under the action of an electric field, improves the ion transfer rate, is stable in operation, and has relatively high separation rate and current efficiency.

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.

A secondary battery using lithium cobalt oxide as a positive electrode active material has a problem in that the battery capacity decreases due to repeated charging and discharging. To provide positive electrode active material particles with less deterioration.SOLUTION: The method includes a first step of arranging a container containing lithium oxide and fluoride in a heating furnace, and a second step of heating the inside of the heating furnace in an atmosphere containing oxygen, wherein the heating temperature in the second step is 750 °C or higher and 950 °C or lower. According to the above manufacturing method, fluorine is contained in the positive electrode active material particles, and fluorine improves the wettability of the surface of the positive electrode active material, so that homogenization and planarization can be achieved. In the positive electrode active material obtained in this manner, the crystal structure is less likely to collapse during repeated charging and discharging at a high voltage, and a secondary battery including the positive electrode active material having such characteristics has significantly improved cycle characteristics.SELECTED DRAWING: Figure 5

The invention discloses a method for cleaning and repairing a degraded lithium-magnesium separation nanofiltration membrane and application thereof, and belongs to the technical field of water treatment membrane repairing, the method comprises the following steps: (1) soaking the degraded lithium-magnesium separation nanofiltration membrane with a solution containing a chemical cleaning agent, and then washing with water; (2) putting the nanofiltration membrane treated in the step (1) into a solution containing a chemical cleaning agent for ultrasonic cleaning, and then washing with water; and (3) repairing the nanofiltration membrane treated in the step (2) by using a repairing agent, and washing with water after repairing to complete cleaning and repairing of the degraded lithium-magnesium separation nanofiltration membrane. The chemical cleaning agent is composed of an alkaline cleaning agent and a surface active agent, the repairing agent is polyethyleneimine or a combination of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride, N-hydroxysuccinimide and polyethyleneimine, and the regenerated lithium-magnesium separation nanofiltration membrane obtained through the method is high in water flux, good in lithium-magnesium separation performance and high in recovery rate. Wide application prospects are realized in the field of water treatment.

This invention relates to a method for synthesizing high-purity magnesium hydroxide (Mg(OH)2) and magnesium oxide (MgO) nanoparticles from waste magnesite mines. The method provides a sustainable process that utilizes environmentally friendly chemicals and low energy consumption. By employing ion exchange resins and cellulose derivatives, the morphology and surface properties of the particles can be precisely controlled. Unlike conventional methods, this technique adheres to green chemistry principles and aims to valorize mining waste within the framework of industrial symbiosis. The synthesized nanoparticles have potential applications across a wide range of sectors, including defense, chemical, healthcare, and agriculture.

The invention discloses a method for preparing low-sodium carnallite and potassium chloride from calcium chloride type brine. The method comprises the following steps: naturally evaporating calcium chloride type brine to obtain sodium salt and potassium saturated brine; mixing a marinating agent with the potassium saturated brine for marinating to obtain marinated mixed brine; naturally evaporating the mixed brine to obtain sodium salt and carnallite saturated brine; naturally evaporating the carnallite saturated brine to obtain low-sodium carnallite ore and old brine; and the low-sodium carnallite ore is subjected to cold decomposition, flotation, washing and drying, and a high-grade potassium chloride product is obtained. According to the invention, calcium chloride type brine with equivalent calcium and magnesium contents is used as a raw material, a brine mixing process technology is introduced, and only low-sodium carnallite ore is separated out through regulation, control and evaporation and is used for preparing high-grade potassium chloride.