158results about "Magnesia" patented technology

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 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.

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 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.

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 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 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 invention relates to the technical field of magnesium oxide preparation, and provides a preparation method of silicon steel grade magnesium oxide, which comprises the following steps: S1, mixing magnesium oxide, boric acid and water to obtain a primary mixed solution; and S2, carrying out filter pressing on the primary mixed solution, and carrying out drying, terahertz treatment, calcination, cooling and crushing on a filter cake to obtain a magnesium oxide product. According to the technical scheme, the problem that magnesium oxide for oriented silicon steel in the prior art is low in activity is solved.

The invention is suitable for the technical field of inorganic powder surface modification, and provides super-hydrophobic caustic-burned magnesia powder and a preparation method thereof. The super-hydrophobic light-burned magnesia powder comprises the following raw materials in parts by weight: 60-70 parts of 85% light-burned magnesia powder, 8-12 parts of modified SiO2 nanoparticles, 10-15 parts of tetraethoxysilane, 5-8 parts of hexadecyl trimethoxysilane, 80-100 parts of ethanol, 3-5 parts of ammonia water, 2-4 parts of modified zirconium oxide and 1-3 parts of a fluoride additive. According to the preparation method, SiO2 nanoparticles and zirconium oxide are modified, so that the hydrophobic property, hydration resistance stability and high-temperature service reliability of the light-burned magnesia powder are remarkably improved, the technical problems that traditional light-burned magnesia powder is high in hygroscopicity and prone to caking are solved, and the preparation method is simple in preparation process, controllable in cost and suitable for multiple industrial fields such as metallurgy and refractory materials.

The application discloses an active magnesium-based material, a preparation method and application thereof, and relates to the technical field of magnesium-based materials. The method comprises the following steps: grinding and crushing at least one of an interface modification additive, a chelating agent and a heterogeneous nucleating agent to prepare a modifier; taking active magnesium oxide and / or common magnesium oxide as raw materials, mixing and stirring the magnesium oxide raw materials with the modifier to modify the magnesium oxide raw materials, and obtaining an active magnesium-based material, wherein the addition amount of the modifier is 0.05-3% of the total mass of the magnesium oxide. The method can modify the magnesium oxide raw materials through the modifier to adjust the hydration activity of the active magnesium-based material, and can also improve the dispersion performance, chelating performance and / or precipitation speed of the active magnesium-based material, thereby improving the application performance of the active magnesium-based material in the field of hydrometallurgy. When the active magnesium-based material is used for precipitating nickel and cobalt, the active magnesium-based material has excellent precipitation efficiency, low unit consumption, and can also reduce the content of impurities in nickel hydroxide and cobalt hydroxide.

The present invention provides an annealing separator which, after being coated with the annealing separator, can maintain the shape of the roll material after annealing at a high temperature of 1000°C or more. The annealing separator used in the annealing separator contains magnesium oxide as the main component, 0.020-0.200% by mass of B, 0.030-1.000% by mass of SO3, and 0.050-1.000% by mass of P2O3, and contains 0.2-5.0% by mass of particles with a particle size of more than 45 μm and 75 μm or less, and the particles with the above particle size contain 0.002-0.020% by mass of B, less than 0.030% by mass of SO3, and less than 0.050% by mass of P2O3.

This invention provides a method for stably mixing two or more types of magnesium oxide with different levels of reactivity in a method for producing magnesium oxide. [Solution] The method for producing magnesium oxide comprises an input step, a mixing step, and a storage step. In the input step, magnesium oxides with different levels of activity are introduced from a raw material tank 11, in which each of the magnesium oxides is stored, into a corresponding storage tank 12. In the mixing step, each of the magnesium oxides introduced into the storage tank 12 is mixed in a mixer 40. In the storage step, the mixed magnesium oxide mixed in the mixer 40 is stored in a product tank 13. All of the input step, mixing step, and storage step are carried out in a closed system.

To provide a production method for magnesium oxide powder for tablets that has suppressed bulk density and excellent compression moldability during tableting.SOLUTION: The method includes the steps of (1) preparing a slurry containing magnesium hydroxide and magnesium carbonate, (2) drying the slurry of (1), and (3) calcining the dried product of (2). The ratio of magnesium hydroxide to the total amount of magnesium hydroxide and magnesium carbonate in the slurry of the step (1) is 5 to 70% in mass ratio based on magnesium oxide.SELECTED DRAWING: None

The invention discloses a production method of electrical grade magnesium oxide powder for inhibiting blackening, an additive and application. The production method comprises the following steps: S1, taking iron oxide and quartz powder as raw materials, preparing materials according to a molar ratio of Fe to Si of 2: 3, and performing high-temperature synthesis to obtain an iron and ferrous silicate compound; s2, the compound is smashed and screened, and particles with the particle size ranging from 100 meshes to 300 meshes are selected; s3, firing the particles at 900-1000 DEG C for 2-3 hours, and converting low-valence iron into high-valence iron in a high-temperature oxidation environment to obtain a blackening inhibiting additive mainly containing iron silicate; and step S4, uniformly mixing the additive into the fused magnesium oxide base powder according to the weight ratio of 0.3-1.0%. The high-temperature oxidizing property of Fe < 3 + > in high-iron silicate is utilized, carbon generated by carbonization of organic matter can be effectively oxidized into gas to be discharged, aluminum separated out by a heating wire is oxidized into insulating aluminum oxide, and reaction byproducts ferrous silicate and silicon dioxide are insulators. The magnesia powder can obviously solve the problem of organic and inorganic blackening of the electric heating element, improve the insulating property and prolong the service life.

Provided are: a magnesium oxide powder which exhibits excellent moisture resistance and is capable of attaining a low dielectric tangent which is also applicable to high-frequency-band devices; and a resin composition which uses the same.　A magnesium oxide powder (I) which contains coated particles (X) obtained by coating the surface of core particles (A) containing magnesium oxide with a coating layer (B) which contains MgAl2O4, wherein the proportion of the MgAl2O4 to the total mass of the magnesium oxide powder (I) is less than 13 mass%, and the BET specific surface area (Si) of the magnesium oxide powder (I) is less than 2.3m2 / g.

The present invention relates to a hollow magnesium oxide composite having a cavity and a manufacturing method therefor, the hollow magnesium oxide composite comprising: a core portion having a hollow; and a shell portion comprising magnesium oxide crystal grains and a metal element different from magnesium and having at least one cavity communicating with the hollow.

A coated nanocluster (10) comprises: a core (20) including an aggregate of magnesium oxide particles; and a shell (30) covering the core (20). The shell (30) has a coating layer (31) containing at least one of a nitrate and a nitrite, and carbonate particles (32) dispersed in the coating layer (31). At least one of the nitrate and the nitrite contains an alkali metal ion. The carbonate particles (32) contain at least one selected from a calcium ion, a strontium ion, and a barium ion. The molar ratio of the carbonate particles (32) constituting the shell (30) to the magnesium oxide particles constituting the core (20) is more than 0.005 and 0.015 or less.

The application provides a porous spherical high-activity magnesium oxide and a preparation method thereof; the preparation method of the porous spherical high-activity magnesium oxide comprises the following steps: S1, obtaining a magnesium bicarbonate solution; S2, performing spray drying on the magnesium bicarbonate solution to obtain light magnesium carbonate solid powder, wherein the light magnesium carbonate solid powder has a hollow spherical structure; and S3, performing calcination on the light magnesium carbonate solid powder to obtain the porous spherical high-activity magnesium oxide. The high-activity magnesium oxide with a porous hollow spherical structure can be obtained, and the prepared magnesium oxide reaches the product standard of activity-180 in the standard HG / T 3928-2012 Industrial Active Light Magnesium.

The present disclosure relates to a process of extracting magnesium or magnesium compounds from a ferronickel slag feed comprising magnesium and silica compounds, the process comprising: a comminution step to reduce a particle size distribution of the ferronickel slag feed; and an acid leaching step after the comminution step, comprising: leaching the ferronickel slag feed from the comminution step in a vessel with hydrochloric acid at a concentration of 5-15 wt.% HCl to form a leached slurry, controlling the hydrochloric acid concentration during leaching by adding further hydrochloric acid to the vessel to maintain the hydrochloric acid concentration at 5-15 wt.% HCl, and obtaining a leached slurry from the vessel, wherein the leached slurry comprises a liquid portion and a solids residue, and wherein the liquid portion comprises magnesium chloride.

The invention relates to a method for technically obtaining magnesium metal from seawater in a CO2-neutralizing manner, in which the obtained magnesium is further processed for use as a metallurgical raw material, but can also be used as a starting material for obtaining hydrogen in a CO2-neutralizing manner, the CO2 obtained or released during the entire process is dissolved and incorporated in seawater.

The present invention relates to a CO ferromagnetic material processing method, comprising the steps of: preparing a starting product comprising at least 20% by mass of one or more of ultramafic rock, weathering products of ultramafic rock, olivine and / or industrial waste; homogenizing the starting product; and hydrothermally treating the homogenized starting product in a heat treatment device at a temperature above 100° C. for at least 24 hours. 2 The method further relates to a method for sequestering CO. The converted starting product is then dehydrated of bound water by thermal treatment and / or reactive grinding. 2 In contact with CO 2 and combine.

The application provides a system and method for comprehensively utilizing low-grade magnesite to produce magnesium oxide and calcium chloride. The system comprises a crushing and screening assembly that gradually crushes and screens the low-grade magnesite to a set particle size; a first processing assembly connected to the crushing and screening assembly, which is used to obtain a treatment liquid by reacting the low-grade magnesite with a leaching liquid, and to obtain light-burned powder by washing and burning the solid residue; a second processing assembly connected to the first processing assembly, which is used to obtain a mother liquor and a precipitate residue by reacting the treatment liquid with a precipitant; the precipitate residue is washed, dried, and calcined to obtain magnesium oxide; and a concentration and crystallization assembly connected to the second processing assembly, which is used to obtain calcium chloride by concentrating and crystallizing the mother liquor. The application solves the technical problems of low comprehensive utilization rate of low-grade magnesite and difficulty in extracting magnesite products.

The present invention provides a method for preparing high-purity magnesium oxide from waste refractory material through an environmentally friendly wet metallurgical process, and magnesium oxide prepared by the method, comprising: a step of separating leach liquor from residue by solid-liquid separation after leaching magnesium-containing waste refractory material (step S10); a step of purifying the leach liquor from impurities (step S20); a step of powderizing the leach liquor after the impurity purification leaching step to prepare magnesium-containing powder (step S30); a step of heat treating the magnesium-containing powder to prepare magnesium oxide (step S40); and a step of washing the heat-treated magnesium oxide to increase purity (step S50).