159results about "Magnesium hydroxide" patented technology

The invention discloses a crosslinked polyethylene low-smoke halogen-free flame-retardant power cable which comprises the following hierarchical structures: a conductor layer; an insulating layer; a shielding layer; the shielding layer takes polyethylene as a matrix and comprises the following components in parts by weight: 70-78 parts of matrix, 20-25 parts of carbon black and 2-5 parts of nano montmorillonite modified lignin, the thickness of the shielding layer is 0.8-1.2 mm, the shielding layer and the insulating layer are molded through a co-extrusion process, and the interface gap is less than or equal to 0.1 mm. The nano montmorillonite modified lignin is adopted as a core flame retardant, the addition amount is reduced by 10%-15% compared with that of a traditional halogen-free flame retardant, by taking a 120 mm civil cable as an example, 18 parts of modified lignin replace 25 parts of a traditional flame retardant with the same flame retardant effect, the raw material cost is reduced by 8%-12%, lignin is derived from agricultural and forestry wastes, dependence on a petroleum-based material is reduced, and the environment-friendly flame-retardant cable material is suitable for industrial production. The gradient cooling process shortens the cooling time by 20%-30% compared with the traditional single-section cold water cooling process, and meanwhile, the pre-crosslinking process reduces the subsequent forming internal stress and reduces the rejection rate.

The invention belongs to the technical field of inorganic chemical material preparation, and discloses a high-selectivity crystallization and impurity migration inhibition method of high-purity magnesium hydroxide. The method comprises the following steps: a phenylphosphonic acid surface modifier is introduced in the initial stage of crystallization, molecules of the phenylphosphonic acid surface modifier selectively occupy high-activity Mg < 2 + > sites of a magnesium hydroxide crystal face through bidentate coordination, and a molecular-level interface barrier with steric hindrance and electrostatic repulsion effects is formed, so that a Ca < 2 + > migration path is specifically blocked, and Mg < 2 + > crystallization is not influenced. The preparation method of the high-purity magnesium hydroxide is high in selectivity, high in efficiency, low in cost and environmentally friendly, the interface adsorption behavior of calcium ions is accurately intervened in the initial stage of crystallization through a molecular level surface engineering means, the technical bottleneck that impurity migration and lattice doping are difficult to control in a traditional process is fundamentally solved, and the preparation method is suitable for industrial production. And a brand new technical path is provided for green manufacturing of high-performance inorganic functional materials.

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 present disclosure relates to a brine purification device, its purification method and uses thereof. It is disclosed a brine purification device comprising a housing with an inlet configured to receive untreated brine and an outlet configured to discharge purified brine from a purification chamber; wherein the purification chamber within said housing is configured to have two separated hemispheres; wherein the at least one plate comprises a first engraved serpentine flow channel in a first side configured for the flowing of brine and a second engraved serpentine flow channel in the opposite side of the same plate configured for the flowing of a flowing fluid; wherein the two sides of the at least one plate are separated by an anion-exchange membrane in such a way that the untreated brine combine with counter-ions from the flowing fluid through said anion-exchange membrane; wherein the at least one plate is configured for a fluid velocity of 0.007 to 0.015 m / s considering a thickness of 3 to 6 mm.

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.

The invention relates to an extraction agent and an extraction method, and relates to the technical field of wet extraction of industrial solid waste, and the extraction agent comprises the following components in parts by mass: an extraction main agent, an anti-impurity stabilizer and an extraction aid; the extraction main agent comprises di (2-ethylhexyl) phosphate and mono (2-ethylhexyl) phosphate, the impurity-resistant stabilizer comprises an imidazoline derivative, a triazine derivative and dimethyl methylphosphonate, and the extraction assistant comprises isooctyl alcohol; the extraction method comprises the steps of ash ball preparation, impurity removal, extraction and the like. According to the extraction agent and the extraction method, interference impurities such as trace heavy metal ions, sulfides and cyanides generated due to component fluctuation in the purified ash of the calcium carbide furnace are selectively chelated, the impurities are prevented from being combined with the extraction main agent, and then the anti-interference stability of the extraction agent under the condition that the impurity content of the purified ash of the calcium carbide furnace fluctuates is improved; and the control difficulty in the production process is reduced.

To provide a method for producing particles of magnesium hydroxide by which the particles of the magnesium hydroxide can simply be grown by using a magnesium hydroxide material containing a prescribed amount of silicon.SOLUTION: The present disclosure relates to a process for producing particles of magnesium hydroxide. The manufacturing method according to the first disclosure includes a mixture forming step. In the mixture formation step, a mixture is formed by mixing a magnesium hydroxide material containing 100ppm or more and a slurry containing a seed crystal of magnesium hydroxide. The production method according to the first disclosure includes an aging method. In the aging method, the mixture is aged to grow the seed crystals and form particles of the magnesium hydroxide having a larger particle size than the seed crystals.SELECTED DRAWING: None

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

A method of making a material for capturing carbon dioxide from the earth's atmosphere, comprises producing an acid and a base with an electrochemical acid-base generator; dissolving a mineral in the acid to produce a mineral rich solution, separating silica from the mineral rich solution to form a silica depleted solution; adding a first portion of the base to the silica depleted solution to remove impurities by precipitation, adding a second portion of the base until ferrous hydroxide (Fe(OH)2) precipitates, then pausing base addition and removing the ferrous hydroxide precipitate from the solution. Then adding a third portion of the base to the iron-depleted solution to precipitate magnesium hydroxide (Mg(OH)2) and / or calcium hydroxide (Ca(OH)2). Then recovering a salt solution and directing the recovered salt solution to the electrochemical acid-base generator to produce a new acid and a new base. The magnesium hydroxide and / or calcium hydroxide may be used to capture and sequester carbon dioxide from a CO2-containing gas (e.g., air) by forming a carbonate or from the ocean by forming bicarbonate.

The present invention relates to a method for recovering valuable materials from waste. The method for recovering valuable materials from waste comprises the steps of: (a) pulverizing waste, which is generated from an evaporator or a crystallizer among equipment of a zero liquid discharge process for desulfurization wastewater, and then injecting same into a dissolution tank so as to dissolve same in a solvent and separating same into a gypsum (CaSO4) precipitate and a supernatant from which the gypsum has been removed; (b) dissolving, in a desulfurization tank, barium chloride (BaCl2) in the supernatant from which the gypsum has been removed, and separating same into a barium sulfate (BaSO4) precipitate and a supernatant from which the barium sulfate has been removed; (c) dissolving, in a hydroxide tank, sodium hydroxide (NaOH) in the supernatant from which the barium sulfate has been removed, and separating same into a magnesium hydroxide (Mg(OH)2 precipitate and a supernatant from which the magnesium hydroxide has been removed; and (d) injecting, into a salt pond, the supernatant from which the magnesium hydroxide has been removed, so as to recover sodium chloride (NaOH).

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.

The invention relates to the technical field of chemistry, in particular to a method for preparing magnesium hydroxide from a magnesium salt solution through a gaseous ammonia precipitation method, and the method is particularly suitable for extracting magnesium hydroxide from multi-component water mineral raw materials with high calcium content. The method comprises the following steps: in a nitrogen or inert gas atmosphere, introducing gaseous ammonia into a magnesium salt solution (comprising a multi-component water mineral raw material containing high-concentration calcium), and controlling the molar ratio of NH to Mg to be 2.5: 1-4: 1, so that magnesium hydroxide is precipitated and separated out; and after the precipitation process is completed, filtering and washing under the same atmosphere, and drying and crushing the obtained product. The method can realize one-step high-efficiency separation of magnesium hydroxide, and is also suitable for taking a multi-component natural mineral raw material with high calcium content as an initial solution.

A structured powder for capturing CO2 from a gas stream includes an agglomerated powder, wherein magnesium hydroxide is 5 wt% to 90 wt% of the powder, and particles of the powder have a mean diameter of 1 micron to 40 microns. The structured powder has a mean largest dimension of 1 mm to 250 mm and an internal porosity of 10 vol% to 50 vol%.

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.

A method may comprise producing liquid sodium and chlorine gas by electrolysis. The liquid sodium may be redox reacted with iron and / or manganese oxide in an ore to produce iron and / or manganese and s

The invention relates to a preparation method of a flaky magnesium hydroxide flame retardant, belonging to the technical field of inorganic material preparation, and the preparation method of the flaky magnesium hydroxide flame retardant comprises two steps of precipitation method synthesis and epoxy coating. According to the obtained flaky magnesium hydroxide flame retardant, the particle size distribution tested by a laser particle size analyzer is that D10 is 0.022-0.034 [mu] m, D50 is 0.591-0.608 [mu] m, and D90 is 1.398-1.749 [mu] m, 40 wt% of the flaky magnesium hydroxide flame retardant is added into EVA, the limit oxygen index of the EVA is increased to 31.1-32.0%, and the UL94 vertical combustion grade can reach V-1.

This invention discloses a low-viscosity, high-solids-content magnesium hydroxide suspension and its preparation method, comprising the following components by mass: 40-60 parts water, 40-60 parts magnesium hydroxide, 0.1-4 parts dispersant, and 0.01-2 parts stabilizer; wherein the viscosity of the magnesium hydroxide suspension is <100 cp; and the particle size D of the magnesium hydroxide is... 50 The particle size is 1~3μm. This invention successfully prepared a low-viscosity, high-solids-content magnesium hydroxide suspension that is stable for a long time and does not exhibit gelation by adding appropriate amounts of dispersants and stabilizers and adjusting the particle size of magnesium hydroxide particles, combined with high-speed stirring and ball milling processes. This not only improves processing efficiency and product performance, but also demonstrates significant economic benefits in transportation and storage.

The application discloses a preparation method of a flame-retardant LLDPE with good processability, and comprises the following steps: step (1), crushing LLDPE raw materials to obtain LLDPE raw material powder; step (2), uniformly mixing flaky magnesium hydroxide into the LLDPE raw material powder to obtain mixed raw material powder; and step (3), adding the mixed raw material powder into a double-screw extruder to perform granulation to obtain the flame-retardant LLDPE. The application can solve the problem that the existing LLDPE material has poor processability after adding inorganic flame retardants.

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.

[Problem] There is a need for a device that synthesizes methane from hydrogen and carbon dioxide gases, but removes reaction heat and further reduces the progress and temperature of the reaction to improve the conversion rate of methane. [Solution] The present invention uses the powders of chemical heat accumulators magnesium hydroxide and magnesium carbonate as part of the fluid medium of a multi-stage fluidized bed to absorb and store the heat generated during the methanation reaction in the temperature range in which the methanation reaction proceeds, and is able to use the carbon dioxide gas generated from the magnesium carbonate as a raw material gas for the methanation reaction. When the magnesium oxide produced by heat absorption is discharged and regenerated in an external regeneration device, the stored heat is recovered, and the regenerated powder is reintroduced at the highest stage of the multi-stage fluidized bed at a temperature lower than the internal temperature of the device, so that the progress and temperature of the reaction can be reduced as the reaction gas rises through the device, and the conversion rate of the generated methane is improved.

The invention relates to a multi-metal element nano-aluminum adjuvant and a preparation method and application thereof, the nano-aluminum adjuvant is a nano-particle containing an aluminum element and at least one metal element selected from magnesium, zinc and calcium, the nano-particle has a layered crystal structure, and the particle size is distributed in a range of 20-2000 nm. The difunctional nano-aluminum adjuvant has the beneficial effects that the difunctional nano-aluminum adjuvant is simple and convenient in preparation method, definite in component and uniform in particle size, the particle size of the particles can be manually regulated and controlled, and the difunctional nano-aluminum adjuvant can directly promote antigen presenting cells to be mature and activated and carry out MHC-I or II type antigen presentation.

To provide a method for producing a magnesium hydroxide particle by which the magnesium hydroxide particle can be easily grown by using a magnesium hydroxide material comprising a prescribed amount of silicon.SOLUTION: The present disclosure relates to a method for producing a magnesium hydroxide particle. A production method according to the first disclosure includes a mixture forming step. In the mixture forming step, a magnesium hydroxide material comprising 100 ppm or more of silicon and a slurry comprising a seed crystal of magnesium hydroxide are mixed to form a mixture. The production method according to the first disclosure includes an aging method. In the aging method, the seed crystal is grown by aging the mixture, and the magnesium hydroxide particle having a larger particle size than the seed crystal is formed.SELECTED DRAWING: None

The invention relates to a reaction device for preparing a magnesium hydroxide flame retardant based on a gas phase method and a preparation method thereof, and belongs to the technical field of chemical engineering equipment and inorganic non-metallic material preparation. The reaction device comprises a precursor precise conveying system, a multi-temperature-zone laminar flow reaction system, an efficient particle collecting system and a central process control system. According to the method, a magnesium source precursor gas-phase flow, a hydrolytic agent gas-phase flow and a surface modifier gas-phase flow are respectively provided by the precursor precision conveying system, are introduced into the multi-temperature-zone laminar flow reaction system through the three coaxial laminar flow nozzles, and are sequentially subjected to controlled mixing in the preheating mixing zone. The whole process is carried out in a gas-phase low-pressure laminar flow environment, hard agglomeration of particles is effectively avoided, the prepared magnesium hydroxide flame retardant has the advantages of being uniform in primary particle size, good in dispersity and high in surface organification degree, and the compatibility and flame retardant efficiency of the magnesium hydroxide flame retardant in a polymer matrix are remarkably improved.

The present disclosure provides a composite metal salt having a hexagonal Cd(OH)2 type crystal structure and an X-ray diffraction intensity ratio (orientation H) of the (101) plane to the (001) plane of 60% or less, and being denoted by the following formula (1):wherein “M2+” denotes at least one divalent metal other than Mg; “A” denotes at least one organic ligand; “x” denotes a number in a range of 0≤x<0.2; “y” denotes a number in a range of 0<y<0.05; and “n” denotes an integer of from 1 to 4, or zero.

The invention provides a method for preparing hydrophobic magnesium hydroxide through a bischofite modified in-situ ammonium method, and relates to the technical field of salt lake secondary magnesium resource utilization. The method comprises the following steps: dissolving primary bischofite, filtering and removing impurities to obtain a pure bischofite solution; preparing an active modifier from octyltriethoxysilane, ethanol, deionized water and acetic acid; adding the bischofite solution and ammonia water into the active modifier at a constant speed, and magnetically stirring to obtain a white precipitate; and finally, washing and drying the white precipitate to obtain the hydrophobic magnesium hydroxide powder. Octyltriethoxysilane is added in the process of preparing magnesium hydroxide through an ammonium method, modification and precipitation are carried out synchronously, a secondary process is not needed, hydrophilic magnesium hydroxide is converted into hydrophobic magnesium hydroxide, the affinity of powder to water is greatly reduced, and the performance of the composite material is improved; the magnesium hydroxide powder material with high performance and high application value can be prepared, and the method has the advantages that a secondary process is not needed, and the performance of the composite material is improved.

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 application relates to the inorganic chemical technology field, specifically to a method for using phosphorus tailings for flue gas desulfurization and simultaneously preparing enriched phosphorus concentrate, high-quality calcium sulfate and magnesium hydroxide. The present application uses phosphorus tailings after calcination, ammonium nitrate solvent leaching once to separate calcium and magnesium, and then uses magnesium to remove SO2 in flue gas, which has high desulfurization rate and fast reaction speed. Through the desulfurization process, enriched phosphorus concentrate, high-quality calcium sulfate and magnesium hydroxide are obtained, realizing the perfect combination of flue gas environmental protection desulfurization, comprehensive utilization of phosphorus tailings and high-value-added product manufacturing.

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.

Described herein are compositions, methods of producing the compositions, and uses of the compositions for carbon dioxide sequestration. The compositions include a mixture of magnesium hydroxide, a metal hydroxide, and water to create a composition that is highly effective at sequestering carbon dioxide.

Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing solution is exposed to carbon dioxide to induce precipitation of a divalent ion carbonate salt.