282results about "Magnesia" patented technology

A negative active material, a method of preparing the negative active material, and a rechargeable lithium battery including the negative active material are disclosed. The negative active material may include a crystalline carbon core and a magnesium (Mg)-included coating layer on a surface of the core, wherein the Mg-included coating layer may include MgO and MgxSiOy (1≤x≤2 and 3≤y≤4).

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

Magnesium oxide is provided. When magnesium oxide is dispersed in water at a ratio of 16 g of magnesium oxide per 100 g of water, the relaxation time of TD-NMR at 40°C satisfies the requirement of 1000 milliseconds or less.

The application discloses a preparation method of low-chlorine magnesium oxide. The method comprises the following steps: adding high-chlorine magnesium hydroxide slurry into an electrolytic cell, adding an anode liquid into an anode chamber, adding a cathode liquid into a cathode chamber, and adding a reinforcing agent into the high-chlorine magnesium hydroxide slurry. A direct current electric field is applied between the anode and the cathode by using a pulse power source to remove chlorine. Under the action of the electric field, the negative-charged chlorine ions move to the anode chamber by electromigration, and the chlorine moves to the cathode chamber by electrodialysis in the form of chlorides or other soluble ions, so as to reduce the concentration of the chlorine ions in the high-chlorine magnesium hydroxide slurry. After the chlorine is removed, the magnesium hydroxide is filtered and calcined to obtain the low-chlorine magnesium oxide. The method has the advantages that the high-energy-consumption processes such as ball milling and calcining in the traditional chlorine removal process of magnesium hydroxide are avoided, the harm of the chlorine ions to the equipment is reduced, the chlorine ions in the magnesium hydroxide are removed only by electromigration and electrodialysis, and the green and efficient preparation of the low-chlorine magnesium oxide is realized.

The invention provides an air-stable layered oxygen positive electrode material, a preparation method thereof, a positive plate and a sodium ion battery, and relates to the technical field of sodium ion batteries. The air-stable layered oxygen positive electrode material comprises an O3 type layered metal oxide and a Li3PO4-MgO amorphous passivation layer, the surface of the O3 type layered metal oxide is coated with the Li3PO4-MgO amorphous passivation layer, the chemical general formula of the O3 type layered metal oxide is Na < 1-2x > Ca < x > (Ni Cu Fe < c > Mn < d >) < 1-y > Zn < y > O < 2 >, x < = 0.075, 0 < = y < = 0.1, 0.2 < = a < = 0.3, 0 < = b < = 0.1, 0.3 < = c < = 0.4, 0.3 < = d < = 0.4, and a + b + c + d = 1. The air-stable layer oxygen positive electrode material provided by the invention has a stable crystal structure, a proper interlayer spacing, an excellent Na < + > diffusion channel and air stability.

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

The invention provides spodumene impurity residue removal lithium extraction equipment and a lithium chloride and magnesium oxide preparation process, and relates to the technical field of solid waste treatment, the spodumene impurity residue removal lithium extraction equipment comprises a water bath extraction box, a first mounting plate, a second mounting plate, a reciprocating mechanism and a stirring mechanism; a first mounting plate and a second mounting plate are respectively mounted at the top of the water bath extraction box, the reciprocating mechanism comprises a motor mounted at the top of the first mounting plate, an output shaft key slot of the motor is connected with a turntable, and a limiting frame is fixedly arranged at the bottom of the first mounting plate. According to the scheme, the reciprocating mechanism is matched with the stirring mechanism to rotate in a reciprocating manner, so that the lithium dissolution and separation rate can be increased, a local dead zone formed by single stirring can be broken through the compound motion of reciprocating rotation and stirring, a lithium-containing filtrate forms a strong turbulence and shear effect in the water bath extraction box, updating of a surface leaching agent can be accelerated, and the extraction efficiency is improved. The diffusion resistance of lithium ions on a solid-liquid interface is reduced, so that the dissolution rate of lithium from a solid state to a solution is remarkably increased, and the overall extraction period is shortened.

The present application relates to the field of magnesium-aluminum composite oxide preparation, and discloses a magnesium-aluminum composite oxide and a preparation method thereof.The method comprises the following steps: (1) under anhydrous conditions, performing a first reaction on aluminum and a first aliphatic alcohol to obtain an alkoxide aluminum-containing material; (2) under the action of a catalyst, performing a second reaction on the alkoxide aluminum-containing material obtained in step (1), magnesium and a second aliphatic alcohol under anhydrous conditions; (3) performing hydrolysis on the reaction product of step (2) to obtain a magnesium-aluminum bimetallic alkoxide, and then performing optional drying and calcination to obtain a magnesium-aluminum composite oxide; wherein the first aliphatic alcohol and the second aliphatic alcohol each independently comprise n-pentanol and optionally n-hexanol. The preparation method of the magnesium-aluminum composite oxide provided by the present application can obtain a high-purity magnesium-aluminum composite oxide without subsequent purification treatment, and has the advantages of short initiation time and short reaction time.

The objective of the present invention is to provide a method for producing a core-shell particle without requiring the synthesis of a core particle and the adjustment of the electric charge of the surface of the core particle, and to provide a method for producing a hollow particle without requiring thermal energy in a hollowing step of the core-shell particles. The method for producing the core-shell particle according to the present invention includes a step for forming a shell by directly fluorinating the surface layer of a core particle consisting of a magnesium inorganic salt. Next, the method for producing a hollow particle of a fluoride includes a step for removing only the core particle with an acid from the core-shell particle obtained by the above-mentioned producing method.

Provided is a magnesium oxide.　This magnesium oxide, when being made into an aqueous dispersion containing the magnesium oxide at a proportion of 16 g per 100 g of water, exhibits a relaxation time satisfying 1000 milliseconds or less in TD-NMR at 40°C.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

The invention relates to a method for recovering a magnesium element from a magnesium-containing solution and application thereof, and relates to the technical field of wastewater treatment. According to the method, magnesium precipitation separation is achieved through the steps of alkalization, carbonization, flash decomposition and the like, and basic magnesium carbonate, active magnesium oxide and ammonium sulfate with high additional values can be recycled.

It is provided a process for extracting nickel sulfate from mining ores, such as serpentine, comprising the steps of conducting a magnetic separation of the mining ores producing a magnetic fraction and a non magnetic fraction; leaching the non magnetic fraction with HCI producing a slurry comprising metals chloride; filtrating the slurry producing a metals chloride liquor; purifying the metals chloride liquor producing a magnesium chloride solution; separating an iron-nickel cake from the magnesium chloride solution; leaching the cake together with the magnetic fraction producing a metallic sulfate solution; extracting nickel and cobalt from the metallic sulfate solution by a ion exchange resin extraction and stripping producing an inorganic stripped phase; submitting the inorganic stripped phase to a liquid-liquid extraction producing a nickel concentrated phase; and evaporating and drying the nickel concentrated phase to recuperate nickel sulfate.

The present invention discloses a method for preparing coated spherical magnesium oxide powder. The method comprises first uniformly mixing magnesium oxide with a coupling agent to obtain a primary modified magnesium oxide powder, then mixing with a water-soluble surface treatment agent to obtain a secondary modified magnesium oxide powder, then adding water to form a slurry, and spray drying to form spherical magnesium oxide agglomerates with a D50 of 10 to 150 μm. Finally, a flame melting method is used for spheroidization to obtain spherical magnesium oxide powder. The present invention sequentially coats the magnesium oxide powder with different modifiers, effectively suppressing the occurrence of its hydrolysis reaction during the slurrying process, reducing heat loss during the spheroidization process, and obtaining a spherical magnesium oxide product with high sphericity and high moisture resistance.

The invention discloses a method for macroscopically preparing two-dimensional nanosheets based on an external field coupling technology, and belongs to the technical field of external field coupling and macroscopically preparing the two-dimensional nanosheets. Polyvinylpyrrolidone (PVP) is dissolved in absolute ethyl alcohol and stirred to form a uniform and transparent solution; adding acetone and metal precursor salt into the solution, and continuously stirring to obtain a uniform and stable precursor solution; carrying out gas jet spinning on the precursor solution through a needle head to obtain a composite nanosheet; and calcining the composite nanosheet in an air atmosphere to obtain the hierarchical porous metal oxide two-dimensional nanosheet. The method is convenient and efficient to operate, products are easy to obtain, macroscopic preparation can be achieved, and the green and environment-friendly production concept is met. According to the method, the fine structure of the two-dimensional nanosheet can be regulated and controlled by introducing a continuous air flow external field and only changing the three parameters of air pressure, the solution flow rate and the thickness of the needle head.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

The invention discloses efficient antibacterial nano magnesium oxide and a preparation method thereof, and relates to the technical field of inorganic nano powder synthesizing.The method comprises the steps that industrial magnesium sulfate heptahydrate, urea and a surfactant are mixed, a magnesium carbonate intermediate is synthesized through a hydrothermal precipitation reaction, and then nano magnesium oxide powder is prepared through high-temperature calcination of a muffle furnace. The antibacterial rate of the nano magnesium oxide prepared by controlling the morphology to staphylococcus aureus reaches up to 99.11%, and the nano magnesium oxide has great potential in the field of antibacterial materials. Meanwhile, the nano magnesium oxide with high specific surface area is also widely applied to the fields of inorganic flame retardants, heavy metal adsorption materials, high-efficiency catalysts and the like. The process is based on low-cost bulk raw materials, has the advantages of being simple in process, green and environment-friendly (production waste liquid is converted into agricultural ammonium sulfate), controllable in morphology and the like, and provides a breakthrough technical scheme for large-scale industrial production of nano magnesium oxide.

The present disclosure relates to methods for producing hydrogen and calcium- or magnesium-bearing carbonates by capturing, converting, and storing carbon dioxide. The methods may include providing one or more calcium- or magnesium-bearing compounds; providing one or more water-soluble oxygenates; providing a plurality of catalysts; and reacting one or more calcium- or magnesium-bearing compounds and one or more water-soluble oxygenates with plurality of catalysts under conditions to produce hydrogen and calcium- or magnesium-bearing carbonates. The methods may include providing one or more calcium- or magnesium-bearing silicates; providing carbon monoxide; providing water vapor; and reacting one or more calcium- or magnesium-bearing silicates, carbon monoxide, and water vapor. The methods may include providing one or more calcium- or magnesium-bearing compounds; providing one or more water-soluble oxygenates; providing a catalyst; and reacting one or more calcium- or magnesium-bearing compounds and one or more water-soluble oxygenates with said catalyst.

A coated member has, on a Fe—Co-based alloy base material, a baked coating of magnesium oxide having a lattice constant of 4.20-4.23 Å.

An improvement in purity of an oxide obtained by baking limestone or the like has been required, and with regard to a production method therefor, a reduction in carbon dioxide emission has been attracting attention as an important issue toward the achievement of a decarbonized society. Provided is a method of endothermically reacting a solid adjacent to an oxide of Ca and / or Mg in a luminescent state involving continuous luminescence by heat radiation, the method including: irradiating the oxide in the luminescent state with laser light; and endothermically reacting the solid with heat from the oxide in the luminescent state that has absorbed the laser light. Also provided is a method of producing a corresponding oxide from a carbonate of Ca and / or Mg serving as the solid.

The present disclosure discloses a method for strengthening a biological manganese oxidation using a magnetic field and use thereof. The method includes steps of inoculating a manganese-oxidizing microorganism into a culture medium containing Mn2+, performing magnetization treatment in a culture process, and then collecting a biogenic manganese oxide. The method includes steps of performing a primary magnetic field treatment at a magnetic field intensity of 0.2-50 mT for 1-5 h when culturing is performed for 6-12 h, continuing culturing after the primary magnetization treatment, and performing magnetization treatment once every other 24 h for culture time of 72 h. A magnetic field is applied to accelerate an oxidation rate of a manganese-oxidizing microorganism to Mn2+ and a biological manganese oxidation rate is respectively improved by 36.4% and 23.8% under an action of an alternating magnetic field or a constant magnetic field within 72 h.

The present application pertains to methods for making metal oxides and / or citric acid and / or capturing carbon dioxide. In one embodiment, the application pertains to a process for producing calcium oxide, magnesium oxide, or both from a material comprising calcium and magnesium. The process may include reacting a material comprising calcium carbonate and magnesium carbonate. Separating, concentrating, and calcining may lead to the production of oxides such as calcium oxide or magnesium oxide. In other embodiments the application pertains to methods for producing an alkaline-earth oxide and a carboxylic acid from an alkaline earth cation - carboxylic acid anion salt. Such processes may include, for example, reacting an alkaline-earth cation - carboxylic acid anion salt with aqueous sulfur dioxide to produce aqueous alkaline-earth sulfite or bisulfite and an aqueous carboxylic acid solution. Other useful steps may include desorbing, separating, and / or calcining.

The present invention relates to a method for the CO2-neutral commercial recovery of metallic magnesium from seawater, wherein the recovered magnesium is further processed for use as a metallurgical raw material and can also be used as a starting material for the CO2-neutral recovery of hydrogen, and the CO2 recovered or released throughout the method is dissolved and bound to seawater.

The present application belongs to the technical field of inorganic material synthesis, and provides an octahedral nano magnesium oxide, a preparation method and application thereof. The preparation raw materials (hydrated magnesium salt and a precipitating agent (including one or more of urea, hexamethylenetetramine and ethanolamine)) are heated at 25-95 DEG C to obtain a reaction liquid, the reaction liquid is subjected to hydrothermal reaction, the obtained gel intermediate is directly calcined to obtain the octahedral nano magnesium oxide. The present application strictly controls the ratio of water to magnesium in the reaction liquid to be ≤130 mL:1 mol, and the one-dimensional nano structure intermediate product can be obtained through hydrothermal reaction; the one-dimensional nano structure intermediate product is calcined to form the octahedral structure [(100) crystal surface] with the lowest energy and the most stable structure; the precipitating agent forms ammonium radical in the hydrothermal reaction, the ammonium radical escapes in the form of nitrogen oxide or ammonia gas, which enriches the pore structure of the octahedral nano magnesium oxide and improves the specific surface area thereof.

The mixed powder is a mixed powder for an annealing separator containing MgO as a main agent, wherein the mixed powder contains Al and B, an Al content contained in the entire mixed powder is 0.0007 mass% or more and 0.050 mass% or less, a B content contained in the entire mixed powder is 0.005 mass% or more and 0.040 mass% or less, the B contains tri-coordinated boron, an average particle size of the mixed powder is 0.08 µm or more and 9.0 µm or less, and a formula (1) below is satisfied. 0.06≤Al / BO3<5.00 In the formula (1), [Al] is an Al content (mass%) in the mixed powder, and [BO3] is a content (mass%) of the tri-coordinated boron in the mixed powder.

The application provides a preparation method of high-quality magnesium oxide and belongs to the technical field of magnesium metal oxide synthesis. The application uses magnesium hydroxide waste produced in an ethyl maltol process as raw material, and obtains magnesium oxide through sodium hypochlorite oxidation, twice water washing and calcination. The obtained magnesium oxide has high purity and high activity. The process flow of the application is short, the calcination temperature is low, the side reaction is less, the subsequent equipment investment is less, the price of sodium hypochlorite is relatively low, the cost is saved, new impurities are not introduced, and the application has good industrial application value.

The utility model belongs to inorganic chemical production technical field especially relates to a kind of production system of magnesium sulfate direct calcination preparation high-purity magnesium oxide, including raw material storage tank, feeding station and calcinator, it is characterized in that, anhydrous magnesium sulfate is loaded in raw material storage tank, raw material storage tank bottom is connected with feeding station by air conveying pipeline;The bottom magnesium oxide outlet of calcinator, the flue gas outlet of calcinator top is connected air preheater, the flue gas outlet of air preheater is connected acid absorption tower by waste heat boiler, the top of acid absorption tower is connected concentrated sulfuric acid tank, the bottom sulfuric acid pipe of acid absorption tower sends magnesium sulfate regeneration device, the flue gas outlet of acid absorption tower is connected ammonia water circulating liquid absorption tower;The bottom magnesium oxide outlet of calcinator is connected packaging production line.Compared with prior art, the utility model has the advantages that: main product purity is improved from 98% to 99.5% or more;100% of solid waste generation is reduced, flue gas after calcination carries out two-stage acid recovery, realizes by-product resource utilization.

The invention relates to the technical field of magnesium oxide manufacturing, in particular to a smelting method of magnesium oxide for synthesizing mica. The smelting method comprises the steps that at least two magnesium-containing raw materials are selected and mixed, and the chemical components of the magnesium-containing raw materials are controlled to meet the preset standards that Fe2O3 is smaller than or equal to 0.16%, MgO is larger than or equal to 47.5%, CaO is smaller than or equal to 0.5%, and ignition loss is larger than or equal to 51%; the mixed raw materials are subjected to crushing, screening, washing, drying and magnetic separation iron removal pretreatment; putting the charging material into smelting equipment, and carrying out open-type high-temperature smelting; after smelting is finished, the smelting equipment is sealed and subjected to heat preservation, the smelting equipment is slowly cooled, the cooled magnesium oxide molten lumps are crushed and sorted, and a finished product is obtained; the detection result shows that the finished product magnesium oxide meets the requirements of raw materials for synthesizing mica. Through multi-component compatibility of magnesite and seawater magnesium oxide, dependence on single high-grade ore is broken through, pretreatment purification, high-temperature long-time smelting and controllable slow cooling processes are combined, and stable production of low-cost and high-quality magnesium oxide for synthetic mica is realized.

The utility model relates to the technical field of magnesia production, in particular to a kiln entering device for magnesia production, which comprises a funnel, a screening component is arranged in an inner cavity of the funnel, the screening component comprises two convex blocks, the outer sides of the two convex blocks are fixedly connected with the inner wall of the funnel, a screen is arranged above the two convex blocks, and the outer side of the screen is fixedly connected with the inner wall of the funnel. Springs are arranged at the joints of the two ends of the bottom of the screen and the protruding blocks, and striking plates are arranged above the two sides of the top of the screen. The magnesite is firstly placed on the screen, then the motor operates, the motor drives the rotary table to rotate, the rotary table drives the guide rod to rotate, the guide rod is matched with the guide groove to drive the push plate to move downwards, the push plate drives the push rod to move downwards, the movable plate is matched with the push rod to move downwards, and the push rod drives the striking plate to move downwards. The striking plate drives the screen to press downwards, and at the moment, the screen is matched with the protruding block to drive the spring to conduct extrusion.