89 results about "Magnesium nitrate" patented technology

The invention relates to the technical field of battery materials, in particular to a para-aramid lithium battery diaphragm and a preparation method thereof. The para-aramid lithium battery diaphragm comprises para-aramid slurry and a base membrane, the para-aramid slurry is coated on the two sides of the base membrane to form para-aramid coatings, and the para-aramid slurry comprises the following raw materials in parts by weight: 20-40 parts of modified para-aramid polymer liquid, 10-20 parts of nano ceramic composite material powder and 10-18 parts of a solvent; the nano ceramic composite material powder is prepared from the following raw materials in parts by weight: 50 to 100 parts of nano aluminum oxide, 8 to 12 parts of nano zirconium dioxide, 0.3 to 0.8 part of yttrium oxide, 1 to 5 parts of magnesium nitrate hexahydrate, 0.1 to 1 part of polyacrylic acid, 1 to 2 parts of ammonia water, 1 to 3 parts of coupling agent and 20 to 30 parts of silicon dioxide; the nano ceramic composite material powder is added into the para-aramid slurry, so that the para-aramid diaphragm has better thermal stability, and the phenomenon of thermal shrinkage of the diaphragm at high temperature is reduced.

The invention provides a refractory ceramic-based material for a smelting furnace lining and a preparation method of the refractory ceramic-based material, and belongs to the technical field of ceramic refractory materials. The material comprises coated modified fused magnesite main aggregate, ceramic sand main aggregate, surface coated magnesium oxide fine powder, gamma-phase aluminum oxide micro powder, an aluminum dihydrogen phosphate solution, alkaline silica sol, a pre-reaction spinel precursor and zirconium boride micro powder. The coated modified fused magnesite main aggregate is prepared by mixing and sintering fused magnesite, silicon carbide composite powder, chromium sesquioxide powder and phenolic resin powder. And mixing the silicon carbide powder and the magnesium oxide powder, and depositing a silicon nitride layer on the particle surface to prepare the silicon carbide composite powder. The surface-coated magnesium oxide fine powder is formed by coating the surfaces of magnesium oxide fine powder particles with aluminum oxide. The pre-reaction spinel precursor is prepared by the following steps: preparing a mixed salt solution from magnesium nitrate hexahydrate and aluminum nitrate nonahydrate by using deionized water, reacting, aging and carrying out heat treatment. And the ceramic sand main aggregate is made of zirconium oxide. And all the layers are matched for use to realize balanced improvement of performance.

The invention provides porous alumina ceramic and a preparation method thereof, and relates to the technical field of ceramic materials. The invention relates to a preparation method of porous alumina ceramic. The preparation method comprises the following steps: dispersing alpha-cellulose powder in deionized water to form a cellulose suspension; stirring to fully swell the cellulose and form uniform gel, and freeze-drying to obtain a template; dissolving aluminum nitrate hexahydrate, magnesium nitrate hexahydrate and yttrium nitrate hexahydrate in absolute ethyl alcohol to obtain a precursor solution; putting gamma-Al2O3 micro powder and ammonium fluoride into a ball milling tank, adding the precursor solution and a dispersing agent, adding zirconium oxide balls and absolute ethyl alcohol into the ball milling tank, and performing ball milling to obtain ceramic slurry; dipping a template into the ceramic slurry, and performing dipping treatment under a vacuum condition to form a composite green body; and sintering to obtain the porous alumina ceramic. According to the porous aluminum oxide ceramic, the process stability is improved, and the problem that the strength is sharply reduced when the porosity is too high is solved.

The invention relates to the technical field of alloy additives, and discloses a high-toughness corrosion-resistant manganese additive for aluminum alloy and a preparation and application method thereof.The additive is prepared from, by mass, 50-65 parts of nanometer manganese alloy powder, 10-18 parts of magnesium-zirconium composite modifier, 4-9 parts of titanate coupling agent, 3-6 parts of dispersing aid and 2-5 parts of high-temperature stabilizer; the magnesium-zirconium composite modifier is a compound system of magnesium nitrate and zirconium oxychloride, and the molar ratio of magnesium element to zirconium element in the magnesium-zirconium composite modifier is 3: 1-5: 1. The dispersion uniformity of the additive is larger than or equal to 96%, after the additive is added, the impact toughness of the aluminum alloy is improved by 45%, the salt spray corrosion resistance reaches 600 h or above, the high-temperature (300 DEG C) stability is improved by 30%, the additive is suitable for various aluminum alloy systems such as 2024 and 6063, the preparation cost is reduced by 22%, and the industrial prospect is wide.

The present application relates to the technical field of reverse water gas shift reaction, and discloses a preparation method of a catalyst for reverse water gas shift reaction, comprising the following steps: weighing magnesium nitrate and zinc acetate, so that the molar ratio of Mg atoms to Zn atoms is 1:1 to 1:10 or 3:1 to 10:1; dissolving the weighed magnesium nitrate and zinc acetate in water, adding urea, stirring and uniformly mixing at room temperature, and then increasing the temperature and stirring to promote the co-precipitation of metal ions; and obtaining the MgO-ZnO composite oxide catalyst by centrifugation, washing, drying and calcination of the obtained precipitate. The MgO-ZnO composite oxide catalyst is prepared by adopting the urea uniform precipitation method, using magnesium nitrate and zinc acetate as raw materials, and precisely controlling the molar ratio of Mg to Zn.

According to the ultrahigh-temperature low-viscosity shear strength improving agent for the water-based drilling fluid and the method, the ultrahigh-temperature low-viscosity shear strength improving agent is prepared from hexadecyl trimethyl ammonium bromide modified montmorillonite, magnesium nitrate hexahydrate and aluminum nitrate nonahydrate, and the obtained low-viscosity shear strength improving agent has good ultrahigh-temperature stability and can effectively stabilize rheological stability under the ultrahigh-temperature condition; and a net-shaped structure connected by polarized water chains is formed, so that the shearing force of the drilling fluid is improved, and the requirement of ultrahigh-temperature formation drilling is met.

The application provides an in-situ liquid gel-forming water-retaining agent and a preparation method and application thereof. The water-retaining agent is composed of A component and B component which are applied in steps. The A component contains an aqueous solution of a natural modified polymer, and the natural modified polymer is selected from one or two of carboxymethyl chitosan, carboxymethyl cellulose or a sodium salt thereof. The B component contains an aqueous solution of a cationic crosslinking agent, and the cationic crosslinking agent is selected from one or more cations of copper nitrate, iron nitrate, zinc nitrate, manganese nitrate, chitosan quaternary ammonium salt, calcium nitrate and magnesium nitrate. The water-retaining agent can realize the integrated functions of slow release of trace elements, water retention, soil improvement and precise nutrition supply. Furthermore, the water-retaining agent is applied to crop growth in combination with the "step-by-step drip irrigation and in-situ gel formation" technology, so that the agronomic characters of crops can be significantly improved.

The invention provides a supported composite catalyst for production of N-methyl o-fluoroaniline, a carrier is Al2O3, and active components are K2CO3, MgO and Cu. The invention discloses a preparation method of a supported composite catalyst. The preparation method comprises the following steps: step 1, dissolving potassium carbonate and magnesium nitrate with preset mass in absolute ethyl alcohol to obtain primary steeping liquor; dissolving cupric acetate in absolute ethyl alcohol to obtain a secondary steeping liquor; step 2, adding Al2O3 into the primary steeping liquor to be fully infiltrated, and drying to obtain a first precursor; step 3, adding the first precursor into the secondary impregnation liquid for full infiltration, and drying to obtain a second precursor; step 4, performing high-temperature roasting on the second precursor, and then cooling the second precursor to room temperature to obtain a K2CO3-MgO-CuO / Al2O3 intermediate; 5, the K2CO3-MgO-CuO / Al2O3 intermediate is subjected to hydrogen reduction at the high temperature, K2CO3-MgO-Cu / Al2O3 is obtained, and the supported composite catalyst is obtained. The catalyst provided by the invention can significantly increase the reaction speed, has less side reactions, and has high stability.

The invention discloses a method and a medicament for relieving tobacco root rot and repairing a root system. A tobacco root rot relieving and root system repairing method comprises the following steps that S1, in the first-aid induction stage, 3-5 days after transplanting, induction liquid is applied in a irrigating mode, and the induction liquid comprises chitosan oligosaccharide, betaine, nano SiO2 and ZnSO4; s2, a slow-release protection stage: 3-7 days after irrigation, chitosan and gelatin coated controlled-release particles are applied to the tobacco root zone, the controlled-release particles comprise mannitol, water-soluble zinc and potassium humate, and the pH value of the root zone is maintained to be 6.0-6.8; s3, an ecological maintenance stage, the period is 15 days, a nutrient solution is applied, and the nutrient solution comprises organic acid, amino acid calcium and magnesium nitrate. The invention provides a green scheme without chemical pesticides and exogenous strains, and the control effect of the root rot is not less than 70%; the root system damage repair time is shortened; the root zone microenvironment is continuously regulated for more than or equal to 15 days.

The invention relates to the field of refractory materials, in particular to a high-erosion-resistance refractory material based on boron nitride modification and a preparation method of the high-erosion-resistance refractory material. The problem that an existing refractory material is poor in erosion resistance is solved. The refractory material is prepared by taking zirconium dioxide, silicon dioxide, calcium oxide, ferric oxide and aluminum oxide as matrixes and adding samarium lanthanum magnesium aluminum composite gel powder and boron nitride loaded chromium sesquioxide, magnesium nitrate, aluminum nitrate, samarium nitrate, lanthanum nitrate and citric acid form gel, high-temperature treatment is performed to obtain the samarium lanthanum magnesium aluminum composite gel powder, and the samarium lanthanum magnesium aluminum composite gel powder is added to the boron nitride loaded chromium sesquioxide. Boron nitride is loaded with chromium sesquioxide after being treated by tannic acid, the corrosion resistance of the material is enhanced through the synergistic effect of all the components, and the material is suitable for high-temperature furnaces, high-temperature reactors and other industrial environments needing high-temperature resistance and high corrosion resistance.

The invention discloses a TEPA modified bimetallic MOF material for CO2 adsorption and a preparation method of the TEPA modified bimetallic MOF material, and belongs to the technical field of CO2 adsorption. The preparation method comprises the following steps: firstly, by virtue of a solvothermal method, taking zinc nitrate hexahydrate and magnesium nitrate hexahydrate as bimetallic sources, and reacting with an organic ligand 2, 5-dihydroxy terephthalic acid, so as to prepare Zn-Mg bimetallic MOF-74; and then grafting tetraethylenepentamine to the skeleton of the bimetallic MOF-74 in an inert atmosphere by adopting a post-synthesis grafting method. The chemical adsorption site of TEPA is combined with the physical adsorption framework of Zn-Mg bimetal MOF-74, the regulation and control effect of bimetal on the pore structure and rich amino functional groups introduced by TEPA are utilized, the CO2 adsorption capacity, the amine efficiency and the cycle stability are improved, and the preparation method is mild in condition, simple in process, easy to expand and suitable for industrial production. The method has a wide application prospect in the fields of industrial flue gas CO2 capture and the like.

The invention relates to the field of filter materials, in particular to a photocatalyst-loaded filter screen and a preparation method thereof.The photocatalyst-loaded filter screen comprises a filter screen body and a photocatalyst coating, the photocatalyst coating is loaded on the surface of the filter screen body in the form of gel, the gel is formed by co-doped sol, and the photocatalyst coating is coated on the surface of the filter screen body. The co-doped sol is obtained by carrying out hydrolysis-polycondensation reaction on an ethanol mixed solution of tetrabutyl titanate, magnesium nitrate, ferric nitrate and urea, and the molar ratio of Ti to Mg to Fe to N in the ethanol mixed solution is 100: 3: 2: 5. According to the photocatalyst-loaded filter screen disclosed by the invention, Ti, Mg, Fe and N are co-doped, so that the formaldehyde degradation rate of the material is synergistically improved on the basis of improving the hydrogen yield of the material, and the photocatalytic activity and the spectral response range are simultaneously improved.

The application discloses a preparation method of a nanoscale multi-metal catalyst, which comprises the following steps: mixing ferric nitrate, magnesium nitrate, lanthanum nitrate, gadolinium nitrate, ammonium heptamolybdate and citric acid with water to obtain a concentrated solution by heating and concentrating; mixing ethylenediaminetetraacetic acid, ammonia water and urea to obtain an ethylenediaminetetraacetic acid solution; mixing the concentrated solution and the ethylenediaminetetraacetic acid solution to obtain a mixed solution by stirring, adding a surfactant into the mixed solution and calcining, and finally roasting. The ferric nitrate, the magnesium nitrate, the lanthanum nitrate and the gadolinium nitrate are mixed, a complexing agent is added, a solution is prepared by using a complexing method, the solution is concentrated, calcined and sieved, and finally the nanoscale multi-metal catalyst is formed. The catalyst prepared by the method has a uniform particle size. The catalyst prepared by the method is combined with a plasma technology to prepare a single-walled carbon nanotube, and the single-walled carbon nanotube (without treatment) has a high ratio, a large IG / ID and a small powder resistance.

The invention discloses a preparation method and application of an acid-base bifunctional magnesium-aluminum bimetallic oxide catalyst, and relates to the technical field of biomass catalytic conversion and heterogeneous catalytic materials.The preparation method comprises the steps that firstly, magnesium nitrate hexahydrate and aluminum nitrate nonahydrate are dissolved into a metal salt mixed solution; dropwise adding a sodium hydroxide aqueous solution into the metal salt mixed solution to obtain a turbid solution; heating and crystallizing in a water bath, transferring into a reaction kettle, and putting into a drying oven for hydrothermal crystallization. The method comprises the following steps: synthesizing a hydrotalcite-like precursor through a coprecipitation-hydrothermal coupling method, and carrying out high-temperature roasting to obtain the acid-base bifunctional composite metal oxide. The acid-base bifunctional composite metal oxide has the beneficial effects that the acid-base bifunctional composite metal oxide has a layered structure and a high specific surface area and is suitable for a biomass pyrolysis-catalytic reforming process, an alkaline site of the acid-base bifunctional composite metal oxide promotes a deoxidation reaction, an acidic site of the acid-base bifunctional composite metal oxide promotes an aromatization reaction, and the acid-base bifunctional composite metal oxide can effectively regulate and control the composition of biomass pyrolysis volatile components; the content of oxygen-containing compounds is obviously reduced, and the selectivity of monocyclic aromatic hydrocarbon is improved.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The application discloses a high-efficiency magnesium nitrate denitration device, which is characterized by being provided with a magnesium nitrate solution buffer tank and an M-shaped baffle distribution plate, the M-shaped baffle distribution plate comprises a center plate, two wing return plates and end baffle plates, the center plate and the baffle plates are horizontally arranged and are each provided with a protruding cofferdam at an outer edge, the two wing return plates are provided with fluid holes and are arranged at an angle with the center plate and the baffle plates, the outer edges of the two wing return plates in the axial direction are also provided with cofferdams, and the axial ends of the two wing return plates are open; the buffer tank can effectively buffer the scouring impact force of heavy component magnesium nitrate due to height difference, meanwhile, the sawtooth structure at the upper end of the tank body can make the magnesium nitrate solution uniformly overflow to the M-shaped baffle distribution plate, so that the corrosion and scouring damage of the magnesium nitrate heater tube can be reduced from the source, and the service life of the heat exchange equipment is prolonged; and the M-shaped baffle distribution plate can prolong the flow and residence time of the solution on the M-shaped baffle distribution plate, so that the denitration effect is improved.

The application discloses a magnesium complex taking aspirin or an oxygen-deficiency promoting derivative thereof as a ligand, a preparation method and application thereof in preparation of a medicine for treating coronary heart disease. The structural formula of the magnesium complex is shown in the following formula I-IV: the magnesium carbonate is reacted with nitric acid to obtain magnesium nitrate; the aspirin is reacted with sodium bicarbonate to obtain a neutral sodium salt of aspirin; the neutral sodium salt of aspirin is reacted with the magnesium nitrate according to a molar ratio of 1:1 or 2:1 to obtain the magnesium complex shown in the formula I or II. The aspirin is reacted with p-nitrobenzyl alcohol to obtain an oxygen-deficiency promoting derivative of aspirin; the oxygen-deficiency promoting derivative of aspirin is reacted with the magnesium nitrate according to a molar ratio of 1:1 or 2:1 to prepare the magnesium complex shown in the formula III or IV. The application has a remarkable repairing effect on heart damage caused by myocardial ischemia and the like.

The invention discloses a transparent ceramic target material for heat dissipation of a vehicle-mounted OLED (Organic Light Emitting Diode) and a preparation method of the transparent ceramic target material, and belongs to the technical field of ceramic target materials. The preparation method comprises the following steps: firstly, enabling aluminum powder to generate AIN nano powder under the action of nitrogen, then dispersing the AIN nano powder into a solvent, sequentially adding gallium nitrate, zinc nitrate and acetylacetone, and treating after reaction to obtain AlN-coated GZO nano powder; gallium nitrate and zinc nitrate are dispersed in a solvent, a complexing agent and magnesium nitrate hexahydrate are added for dispersion, polyethylene glycol is added for a reaction, GZO-MgO composite sol is obtained, AlN-coated GZO nanopowder and the GZO-MgO composite sol are mixed, yttrium nitrate, tin tetrachloride, a binder and an ammonium polyacrylate aqueous solution are added, the mixture is stirred uniformly, and the GZO-MgO nanopowder is obtained. After the pH value is adjusted, ball milling, degassing treatment and sintering are conducted, and the transparent ceramic target material for vehicle-mounted OLED heat dissipation is obtained. The ceramic target material provided by the invention has the characteristics of high light transmittance, high electric conductivity and high heat conductivity, and can effectively prolong the service life of an OLED device.

The application discloses a boiler ash and coking removing agent, a preparation method and application thereof, and belongs to the technical field of coking removing agents. The application is used for solving the technical problems of slow coking removing effect of solid coking removing agents and poor coking removing effect of liquid coking removing agents in the prior art. The boiler ash and coking removing agent comprises aluminum nitrate, potassium nitrate, magnesium nitrate, composite catalyst microspheres, mixed organic acid and water. A multi-amino polyphenyl polycondensate solution and toluene diisocyanate are reacted to obtain a supramolecular polymer solution; sodium hydroxide, dodecyl dimethyl betaine, paraffin wax, copper oxide and iron oxide are uniformly mixed to obtain a mixture; and the composite catalyst microspheres are prepared by coating the mixture with the supramolecular polymer solution; and the composite catalyst microspheres can realize fixed-point blasting under high-temperature conditions. The prepared boiler ash and coking removing agent is sprayed into a boiler in a atomizing mode for coking removing, and has the advantages of rapid coking removing reaction and good coking removing effect.

The application relates to the technical field of biomedical materials, in particular to a degradable material for fracture and a preparation method thereof. The silicate powder is prepared by adding calcium nitrate solution, magnesium nitrate solution and zinc nitrate solution into sodium silicate solution. The silicate powder is mixed with polyvinyl alcohol solution to prepare a mixture. The mixture is poured into a mold, and then stirring, vacuum injection, freezing, sintering and cooling to room temperature are carried out to prepare a fracture fixation object. Modified hydroxyapatite is prepared by taking L-lactic acid, toluene and nano-hydroxyapatite as raw materials. The fracture fixation object is fully immersed in the impregnating solution prepared by mixing polylactic acid, chloroform and modified hydroxyapatite to obtain the degradable material for fracture. The degradable material for fracture prepared by the application has good degradable performance and mechanical performance, can effectively promote body osteogenesis and healing, and therefore has wide application prospects in the field of biological medicine.

The invention discloses a preparation method of a magnesium-iron-aluminum ternary layered double hydroxide loaded modified activated carbon composite material. The preparation method comprises the following steps: preparing modified activated carbon; adding the modified activated carbon and a sodium carbonate solution into water, and stirring to obtain a solution A; and sequentially adding a ferric nitrate hexahydrate solution, an aluminum nitrate hexahydrate solution and a magnesium nitrate hexahydrate solution into the solution A, stirring, adjusting the pH value, heating, reacting, washing and drying to obtain the magnesium-iron-aluminum ternary layered double hydroxide loaded modified activated carbon composite material. The magnesium-iron-aluminum ternary LDH is loaded on the modified activated carbon, and the prepared composite material has excellent uranium adsorption performance and also has excellent adsorption selectivity and cycling stability.

This invention provides a refractory ceramic matrix material for smelting furnace linings and its preparation method, belonging to the technical field of ceramic refractory materials. The material includes coated modified fused magnesia aggregate, ceramic sand aggregate, surface-coated magnesia fine powder, γ-phase alumina micropowder, aluminum dihydrogen phosphate solution, alkaline silica sol, pre-reacted spinel precursor, and zirconium boride micropowder. The coated modified fused magnesia aggregate is prepared by mixing fused magnesia, silicon carbide composite powder, chromium trioxide powder, and phenolic resin powder, followed by sintering. Silicon carbide powder and magnesia powder are mixed, and a silicon nitride layer is deposited on the particle surface to obtain silicon carbide composite powder. The surface-coated magnesia fine powder is magnesia fine powder with alumina coated on the particle surface. The pre-reacted spinel precursor is prepared by preparing a mixed salt solution of magnesium nitrate hexahydrate and aluminum nitrate nonahydrate with deionized water, reacting, aging, and heat-treating. The ceramic sand aggregate is made of zirconium oxide. The allocation and use of each layer achieves a balanced improvement in performance.

This application discloses an air-suspension granulation technology for preparing spherical magnesium nitrate hexahydrate, belonging to the field of magnesium nitrate hexahydrate granulation technology. It includes magnesium nitrate hexahydrate purification and granulation. This application incorporates a hydrophobic agent to form a robust microscopic protective layer, which effectively blocks water molecule intrusion and has a low moisture absorption rate. Furthermore, the air-suspension granulation tower technology is redesigned to better handle surface free water, resulting in higher magnesium nitrate purity, better crystal form, and better applicability to various magnesium nitrate applications. The particle size of the magnesium nitrate hexahydrate particles prepared by this application can be adjusted according to the air velocity, ranging from 0.5 to 12 mm. This technology has a wide range of applications, low cost, high sphericity, and eliminates the need for subsequent separate processing of broken particles, reducing labor costs and improving production efficiency. The magnesium nitrate hexahydrate also exhibits high purity, few impurities, and high product quality.

A method of producing magnesium cement. The method may comprise mixing water at a temperature of between approximately 50° C. and 100° C. and a magnesium salt to form an intermediate mixture and then mixing the intermediate mixture with a magnesium oxygen-containing compound. The magnesium oxygen-containing compound may comprise one or more of magnesium oxide and magnesium hydroxide. The magnesium salt may comprise one or more of magnesium acetate, magnesium bromide, magnesium oxalate, magnesium thiosulfate, magnesium phosphate, magnesium nitrate, magnesium silicate, a magnesium chloride in any hydration state, anhydrous magnesium chloride, hexahydrate magnesium chloride, a magnesium sulfate in any hydration state, anhydrous magnesium sulfate, heptahydrate magnesium sulfate and magnesium carbonate.

The invention discloses a phosphorus-modified magnesium-aluminum hydrotalcite acid catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation.The preparation method comprises the steps that a mixed metal salt solution of magnesium nitrate and aluminum nitrate or an aluminum nitrate solution is subjected to a first water bath reaction, then the pH of the solution is adjusted to 9.5, a second water bath reaction is conducted, and after the second water bath reaction, the phosphorus-modified magnesium-aluminum hydrotalcite acid catalyst is obtained; washing the obtained precipitate to be neutral, drying and roasting to obtain hydrotalcite; the preparation method comprises the following steps: adding hydrotalcite into water, stirring until the hydrotalcite is swelled to obtain hydrotalcite slurry, adjusting the pH value of the slurry to 5.5-6, heating, adding a phosphorus-containing compound, carrying out an exchange reaction, and drying to obtain the phosphorus-modified magnesium-aluminum hydrotalcite acid catalyst. The phosphorus-modified magnesium-aluminum hydrotalcite acid catalyst synthesized by the invention is used for synthesizing o-methoxyphenol by reaction of catechol and dimethyl carbonate, and has better conversion rate and excellent stability.

The invention belongs to the field of novel preparation methods of magnesium-aluminum hydrotalcite, and particularly relates to a preparation method of a magnesium-aluminum composite oxide-based catalyst and application of the magnesium-aluminum composite oxide-based catalyst in preparation of anisole. Magnesium nitrate hexahydrate and sodium metaaluminate are respectively dissolved in deionized water, stirred until being dissolved, mixed and aged; carrying out suction filtration, drying and grinding to obtain a catalyst precursor magnesium-aluminum hydrotalcite; the preparation method comprises the following steps: dipping magnesium-aluminum hydrotalcite into a metal salt solution, heating and stirring in a water bath, and carrying out dipping, drying and roasting cycles for several times to obtain a magnesium-aluminum composite oxide-based catalyst; the metal salt at least contains one of lanthanum, barium, manganese and zirconium metal salts. The active component elements of the catalyst are transition metal, alkaline earth metal and rare earth metal oxides and do not contain noble metal, so that the preparation cost is low; active components are loaded on the surface of the magnesium-aluminum composite oxide carrier in a one-step loading manner, and the process is simple and convenient.

The invention provides a process for the preparation of polyhalite granules comprising the steps of providing an aqueous ammonium nitrate (AN) solution; heating the solution to produce a hot solution; adding the hot solution to polyhalite; and allowing the mixture to cool during a granulation process. The invention further provides a process for the preparation of polyhalite granules where polyhalite is granulated with ammonium nitrate to form potassium nitrate, calcium ammonium nitrate, ammonium nitrate and / or magnesium nitrate and ammonium sulphate and a polyhalite granule comprising polyhalite and potassium ammonium nitrate.

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

The invention relates to the technical field of ferrite materials, in particular to a seawater corrosion resistant ferrite material and a preparation method thereof. The preparation method of the seawater corrosion-resistant ferrite material comprises the following steps: preparing a ferrite ceramic matrix material; preparing a pretreated ferrite material; and preparing the seawater corrosion resistant ferrite material. The magnesium nitrate hexahydrate, the aluminum nitrate nonahydrate, the lanthanum nitrate hexahydrate, the chromium nitrate nonahydrate and the ferric nitrate nonahydrate are dissolved to prepare the sol, and then the sol is dried, pre-sintered and calcined in sequence, so that an MgAlOphase and an LaCrOphase are generated in a magnesium ferrite matrix in situ, a permeation path of a corrosive medium to the interior of the matrix can be effectively blocked, and the corrosion resistance of the magnesium ferrite matrix is improved. The MgAlO phase particles and the LaCrO phase particles are added into the ferrite ceramic matrix material and play a role in passivating the grain boundary, so that the seawater corrosion resistance of the ferrite ceramic matrix material can be improved, in addition, the MgAlO phase particles and the LaCrO phase particles can also change the crack propagation path of the magnesium ferrite matrix, and the fracture toughness of the ferrite ceramic matrix material is improved.

The invention belongs to the field of plastic materials, and particularly discloses a flame-retardant polycarbonate alloy composition as well as a preparation method and application thereof. The flame-retardant polycarbonate composition is prepared from the following components in parts by weight: 44 to 96 parts of polycarbonate resin, 4 to 19 parts of ABS (Acrylonitrile Butadiene Styrene), 0.5 to 16 parts of phosphorus flame retardant and 0.05 to 1.7 parts of anti-dripping agent, the ABS material further comprises a stabilizer, the stabilizer comprises magnesium sulfate and magnesium nitrate, and based on the weight of the ABS, the content of the stabilizer is 20-500 ppm; the content of ABS residual metal is less than or equal to 100 ppm. A trace amount of magnesium sulfate and magnesium nitrate in the composition system are used as stabilizers, and the magnesium sulfate and the magnesium nitrate are matched with the phosphorus flame retardant, so that the polycarbonate alloy composition has high mechanical property and flame retardant stability in a humid and hot environment, and is more suitable for serving under the working condition of the humid and hot environment; the application prospect is further expanded.