40 results about "Hydroxide magnesium" patented technology

The invention discloses a mesoporous magnesium oxide, a hydrodesulfurization catalyst loading CoMo metal sulfide and an application thereof. The mesoporous magnesium oxide is prepared through the following steps that (1) water is used as reaction medium, magnesium hydroxide fully reacts with carbon dioxide under room temperature in an airtight reaction still, then reaction liquid in the reaction still is filtered, and filtrate which contains Mg (HCO3)2 is obtained; (2) macromolecule surfactant N, N-Diethyl-N-Cetyl-N- (3-methoxy silane propane) ammonium iodide are added into the filtrate which contains the Mg (HCO3)2, mixture is heated to 80 DEG C-95 DEG C and maintained to 0.5h-2h under stirring, the mixture is calcinated for 3h-4h after the mixture is filtered and dried, and the mesoporous magnesium oxide is obtained. The hydrodesulfurization catalyst loading CoMo metal sulfide is prepared by that the mesoporous magnesium oxide is used as carriers, is suitable for hydrodesulfurization reactions of dibenzothiophene, and exerts high catalytic activity.

The invention discloses a process for producing in-situ modified nano-magnesium hydroxide by taking phosphate tailings as raw materials. The process comprises the following steps: putting the phosphate tailings obtained by flotation into an acidolysis reactor, reacting for a certain period of time, and then filtering; adding filtrate into an impurity removal reactor, firstly adding an oxidant for oxidation, further adding an alkaline compound, controlling the pH value, filtering a precipitate, then adding the filtrate, a silane coupling agent and a dispersant into an in-situ modification reactor, stirring for a period of time, then adding into a crystallization reactor, introducing ammonia gas, and performing crystallization and precipitation reaction to obtain surface-modified nano-magnesium hydroxide; and producing the filtrate which is rich in free ammonia after crystallization and filtration, obtaining the ammonia gas by air stripping, returning the ammonia gas into the crystallization working section, crystallizing a liquid phase to remove a large amount of ammonium sulfate, and then circulating to the acidolysis reaction process step, thereby realizing closed-loop circulation of wastewater of the process. Surface-modified nano-magnesium hydroxide produced by an in-situ modification method has good interfacial adhesion property and dispersivity in a polymer matrix and can be widely applied to the fields of plastics, coatings, environmental friendliness and the like.

A long term stabilized magnesium hydroxide suspension which can be used for covering pellets of several materials in order to avoid the agglomeration of a plurality of pellets when stored or subjected to a heat treatment and which can be stored for at least three months without substantial agitation and without experiencing substantial settlement and solid hard substrate formation, comprising a solid content of about 51% to 61%; a water content of about 39% to 49%; a viscosity of about 500 to 1,500 cp.; an average particle size of about 1 to 2.5 microns; a Mg(OH)2 content of about 50% to 60%; an equivalent magnesium oxide content of 34% to 42%; including an adherent compound at a concentration of at least 30% in an amount of 0.5 to 5%, by weight, on a dry basis and an anionic polyelectrolyte as a dispersant agent, and which is obtained by washing, filtering and repulping magnesium hydroxide solids to obtain agglomerated solid particles, dispersing the agglomerated solid particles by comminution in a dispersing equipment, to reduce the particle size providing a dispersed product, grinding the dispersed product, to additionally reduce the particle size to about 2 microns; and adding an adherent compound at a concentration of at least 30% in an amount of 0.5 to 5% on a dry basis and an anionic polyelectrolyte at a concentration of at least 25%, in an amount of about 0.5 to 2.5%, by weight, on a dry basis, as a dispersant agent.

Methods for making magnesium hydroxide are described.

The invention discloses magnesium hydroxide super-hydrophobic film and a preparation method and application thereof. The preparation method of the magnesium hydroxide super-hydrophobic film includes:providing a precursor solution containing magnesium ions; using a metal substrate as a cathode, enabling the cathode and an anode to form an electrode system, soaking the metal substrate and the anodein the precursor solution, and performing electrochemical deposition with the electrode system to form magnesium hydroxide film of micro-nano structure on the surface of the cathode; subjecting the magnesium hydroxide film to surface modification, and drying to obtain the magnesium hydroxide super-hydrophobic film. The electric deposition to prepare hydroxide magnesium layer of micro-nano structure is combined with a magnesium hydroxide surface modification technique herein; the preparation method has simple steps; the materials used are low in cost; the prepared novel magnesium hydroxide super-hydrophobic film has good water repelling performance and self-cleaning performance, and has a good application prospect in the fields, such as metal surface corrosion resistance and self-cleaning.

Magnesium hydroxide having a large specific surface area is provided. A magnesium-containing matter is chemically decomposed by a solution of acid, and a primary solution of alkali with weak alkalinity is obtained by adding a solution of alkali to the solution of acid, and impurities contained in the primary solution of alkali are eliminated, and a secondary solution of alkali with strong alkalinity is obtained by adding a solution of alkali to the primary solution of alkali, and successively a magnesium hydroxide is deposited in secondary solution of alkali.

The invention discloses a method for preparing surface-modification ultrafine magnesium hydroxide. The method includes the following steps that (1) ultrafine magnesium hydroxide with the particle size of 4,000 meshes to 6,000 meshes is selected, stirred and preheated for 20 min to 40 min in the stirring speed of 3,000 r / min to 6,000 r / min in a high-speed stirrer at the temperature of 50 DEG C to 100 DEG C; (2) then surface modifier and solvent are slowly and evenly added, the mixture continues to be stirred, the surface-modification time is 50 minutes to 90 minutes, and the modified ultrafine magnesium hydroxide is obtained. According to the modified ultrafine magnesium hydroxide prepared with the method, the good compatibility and the heat stability of the modified ultrafine magnesium hydroxide and a high polymer material are improved, and the mechanical performance, the processing fluidity and the like of the high polymer composite material can be remarkably improved.

The invention relates to a method for preparing high dispersed magnesium hydroxide from agglomerated state magnesium hydroxide, and belongs to the technical field of the preparation of inorganic chemical industry materials. According to the method disclosed by the invention, the high dispersed magnesium hydroxide is prepared through the following steps: using agglomerated state magnesium hydroxide as a raw material, wherein the original average particle diameter is 0.1-3 microns, and the average agglomerated particle diameter is 5-50 microns, firstly, mixing the raw material with proper amount of inorganic solvent, and roasting the mixture for 0.5-6 hours at the temperature of 300-700 DEG C, so as to form dispersed superfine active magnesium oxide; then, adding the magnesia to an aqueous solution containing a dispersing agent and a morphological control agent, and performing hydration conversion for 0.5-6 hours at the temperature of 10-100 DEG C so as to obtain the high dispersed magnesium hydroxide of which the original average particle diameter is 0.1-3 microns, the average agglomerated particle diameter is 0.5-4.0 microns, the morphology is regular, and the particle diameters are homogeneous. The method disclosed by the invention is simple in technology, is mild in process, and is high in added value of a product. The magnesium hydroxide prepared by the method disclosed by the invention is regular in morphology and is good in dispersion, can be used as a basic inorganic chemical industry product to be used in the fields of flame resistance, foods, desulphurization, wastewater treatment and the like.

Magnesium hydroxide having a high aspect ratio, a production method thereof and a resin composition comprising the same.The method of producing the magnesium hydroxide having a long diameter (width) of not less than 0.5 μm and aspect ratio of not less than 10,comprising the steps of:(A) adding an alkali to and coprecipitating it with a mixed aqueous solution of a water-soluble magnesium salt and a monovalent organic acid or a salt thereof, or(B) adding an alkali aqueous solution to and coprecipitating it with an aqueous solution of a water-soluble magnesium salt and adding a monovalent organic acid or a salt thereof to the resulting product; and(C) hydrothermally treating the obtained slurry at 100° C. or higher.

The invention discloses a removing method of magnesium sulfate from waste water solution with magnesium sulfate, which comprises the following steps: predisposing waste water solution with magnesium sulfate; transmitting the solution into micro-filter film device to remove micro-particle impurity; transmitting the solution into nano-filter film; obtaining percolation liquid with low-content magnesium sulfate and condensate with high-content of magnesium sulfate; freezing the condensate; extracting the solid of magnesium sulphate heptahydrate or adding calcium salt or barium salt to obtain calcium sulfate or barium sulfate; reacting magnesium salt and calcium hydroxide to produce magnesium hydroxide and calcium salt; saving the disposing cost; protecting environment; recycling magnesium sulfate.

The invention belongs to the field of medical biological materials and relates to composite magnesium oxide powder for dental alginate impression material used in oral orthopaedics. High-quality magnesium hydroxide and light magnesium carbonate are used as raw materials, magnesium oxide different in activity and quality is obtained in a rotary kiln or a rotational flow dynamic-state furnace through high-temperature calcination and decomposition, and the composite magnesium oxide powder is obtained through ultrafine grinding and full mixing according to a certain proportion. The prepared composite magnesium oxide powder is small in fineness, white in color, large in size, good in dispersity and adjustable in activity, is used for adjusting and controlling the setting time of the dental alginate impression material and can increase impression hardness and smoothness and decrease impression deformation.

The invention discloses an efficient magnesium hydroxide flame retardant wet-process preparation method, and relates to the technical field of wet-process mineral separation. According to the preparation method, wet purification is performed on low-grade brucite to prepare a magnesium hydroxide flame retardant, and particularly comprises the following steps: crushing brucite raw ore into gravels; putting the gravels into an overflow type ball grinder for wet ore grinding to prepare brucite slurry; performing sand removal and purification on the brucite slurry through a spiral sand remover and a hydrocyclone; removing ferric micro powder impurities, mixed during ball grinding, through a high-gradient magnetic separator, then adding a medicine for flotation classification for further purification; performing natural settling, water filtering, pressure filtering, drying and ultrafine smashing on the purified brucite slurry to prepare the magnesium hydroxide flame retardant with different particle sizes. By the adoption of a wet-process mineral separation process, the low-grade brucite can be purified, and the resource utilization rate of the brucite ore is greatly increased; meanwhile, the whole mineral separation process is completed by reasonably adopting large-sized treatment machinery, so that the mineral separation efficiency is greatly improved.

The invention discloses a method for preparing nanometer magnesium hydroxide from phosphorus ore magnesium removal waste liquor. The method specifically includes subjecting ammonia gas and the phosphorus ore magnesium removal waste liquor to further neutralizing and edulcorating reaction in a submerged circulating impinging stream reactor, and performing solid-liquid separation after the reaction so as to obtain mother liquor; adding a dispersant into the mother liquor, and continuing to feed the ammonia gas for magnesium precipitation reaction so as to reach a pH value of 10-11; performing solid-liquid separation, washing and drying after the reaction so as to obtain nanometer magnesium hydroxide powder. The nanometer magnesium hydroxide prepared by the method has the purity up to 98%, is small in particle size and regular in shape and can be widely applied to the fields of fire retardants and flue gas desulfurizing agents, and secondary utilization of resources is achieved effectively.

The invention discloses a process for preparing a magnesium hydroxide whisker and calcium sulfate by using phosphate tailings as raw materials. The process comprises the following steps: mixing phosphate tailings obtained through flotation with hydrochloric acid to react and obtaining a mixed solution containing magnesium chloride and calcium chloride after impurity removal and filtration; mixing the phosphate tailings with sulfuric acid to react and obtaining a magnesium sulfate solution after impurity removal and filtration; mixing the two solutions and obtaining a calcium sulfate precipitate and magnesium chloride filtrate after reaction and filtration; adding alkali liquor to the magnesium chloride filtrate and obtaining a liquid-solid mixture containing a basic magnesium chloride whisker after reaction and aging; adding an alkaline solution later and obtaining the magnesium hydroxide whisker after reaction and aging; returning ammonia gas recovered through gas stripping of the filtrate to the section for producing the magnesium hydroxide whisker and returning the liquid phase after gas stripping to the acidolysis section after the liquid phase is crystallized to remove ammonium chloride. The process has the beneficial effects that the phosphate tailings are used as the raw materials to produce the magnesium hydroxide whisker and the byproduct calcium sulfate, and meanwhile, higher value application of the phosphate chemical solid wastes and cleaner production are achieved by recycling surplus ammonia gas.

The invention relates to a preparation method of highly-dispersed nano-magnesium hydroxide. The preparation method comprises the following steps: dissolving tetramethylammonium hydroxide in anhydrous ethanol to prepare a 2.0-8.0mol / L solution A; preparing a soluble magnesium salt aqueous solution B; slowly adding the solution B into the solution A; and after the solution B is added and sunk under a room temperature condition, filtering, washing the filter cakes, and washing by anhydrous ethanol and drying to obtain a target product. The preparation method provided by the invention has the advantages of simple process and mild reaction condition, and can be used for synthesizing highly-dispersed nano-magnesium hydroxide which is uniform in size distribution.

The invention discloses a process for preparing high-purity silicon steel magnesium oxide from magnesium hydroxide. The process comprises the following steps: performing light roasting on magnesium hydroxide, adding magnesium hydroxide into water, heating to hydrate, further cooling, and slowly adding an ammonium bicarbonate solution into water to carbonize, thereby obtaining a suspension;filtering the suspension, washing and drying the residues obtained after filtration, and further roasting at high temperature, thereby obtaining the high-purity silicon steel magnesium oxide. According to the process, magnesium hydroxide is adopted as a raw material to prepare silicon steel magnesium oxide which is regular in morphology and high in purity, the process procedure is short, and the prepared magnesium oxide is stable in quality and high in production efficiency, and the industrial production requirements are met.

The present invention relates to a device for efficiently preparing magnesium hydroxide, comprising a material mixing tank, a coordinated pressure control unit I, a reactor, a coordinated pressure control unit II, a condenser, a three-way valve, a material storage tank, a coordinated pressure control unit III and a steam generator. A outlet of the material mixing tank is connected with one end of the coordinated pressure control unit I by a pump; the other end of the coordinated pressure control unit I is connected with an inlet of the reactor; the outlet of the reactor is connected with one end of the coordinated pressure control unit II; the other end of the coordinated pressure control unit II is connected with one end of the condenser; the other end of the condenser is connected with a first port of the three-way valve; a second port of the three-way valve is connected with a material inlet of the material mixing tank; a third port of the three-way valve is connected with the material storage tank; a steam inlet of the reactor is connected with one end of the coordinated pressure control unit III; and the other end of the coordinated pressure control unit III is connected with the steam generator.