141 results about "Magnesium nitrate" patented technology

The invention relates to the technical field of preparation methods of nano precursor powder, in particular to a synthesis method of Cr < 3 + > doped magnesium aluminum oxide nano powder, which comprises the following steps: weighing magnesium nitrate, aluminum nitrate and chromic nitrate according to the stoichiometric ratio of MgAl2-xO4: xCr < 3 + >; stirring and mixing the prepared magnesium nitrate solution, aluminum nitrate solution and chromic nitrate solution together to prepare a mixed solution I; ammonia water is dripped into the first mixed solution, then the first mixed solution dripped with the ammonia water is stirred and mixed, and a second mixed solution is prepared; pouring the mixed solution II into a high-pressure reaction kettle, and putting the high-pressure reaction kettle into a constant-temperature box for reaction to prepare a white precipitate; adding deionized water into the white precipitate for washing and precipitating, and centrifuging to obtain white precipitate powder; drying the white precipitate powder at a constant temperature; calcining the dried white precipitate powder to prepare nano precursor powder; the prepared nanometer precursor powder has the advantages of being high in purity and small in particle size.

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 discloses a high-ammonia-nitrogen wastewater treatment process, and belongs to the technical field of pyridine wastewater treatment, and the high-ammonia-nitrogen wastewater treatment process comprises the following steps: preparing hydrotalcite: weighing cobalt nitrate, magnesium nitrate and aluminum nitrate, adding distilled water, and stirring to obtain a salt solution; weighing sodium hydroxide and anhydrous sodium carbonate, adding distilled water, and stirring to obtain alkali liquor; pumping the salt solution and the alkali solution into a round-bottom flask, and heating and dispersing the round-bottom flask on an oil bath pan; putting the ground sample into a ceramic crucible, calcining in a muffle furnace, weighing a silver-ammonia solution and acetaldehyde, and pouring into a round-bottom flask; the pyridine wastewater is weighed, the hydrotalcite is added, stirring adsorption is performed for 20 min, the hydrogen peroxide is added, suction filtration is performed after the reaction, and the hydrotalcite is filtered and separated out for recycling. The problem that existing wastewater treatment is difficult is solved. The method has the advantages of high catalytic activity, easiness in recovery and reutilization of hydrotalcite, no need of adding any auxiliary chemical reagent, mild reaction conditions, low cost and convenience in operation, and can meet the requirements of industrial production.

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 discloses a preparation method of a magnesium-manganese modified carbide slag CO2 adsorbent, which comprises the following steps: step (1), respectively grinding, sieving and drying carbide slag and magnesium nitrate hexahydrate to obtain pretreated carbide slag powder and magnesium nitrate hexahydrate powder; (2) adding the pretreated carbide slag powder and magnesium nitrate hexahydrate powder into deionized water, and uniformly mixing to obtain a mixed dispersion liquid A; (3) sequentially adding a manganous nitrate solution and citric acid into the mixed dispersion liquid A, and uniformly mixing to obtain a mixed dispersion liquid B; (4) heating and stirring the mixed dispersion liquid B to obtain colloidal paste, placing the colloidal paste in a drying oven to volatilize moisture, and grinding to obtain a solid intermediate product; and (5) calcining the solid intermediate product to obtain the magnesium-manganese modified carbide slag CO2 adsorbent. When the composite material is used for carbon dioxide adsorption, relatively high anti-sintering capability and cycling stability are shown.

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 present invention discloses a method for preparing ultrafine particles of low-dielectric ceramic materials for 6G, relates to the technical field of dielectric ceramic materials, and belongs to patent classification number C04B35 / 00. The specific preparation method is to first prepare a sol using tetraethyl orthosilicate, calcium nitrate, magnesium nitrate, aluminum isopropylate, zirconium oxychloride and lithium nitrate, heat the sol and let it stand for gelation, then use supercritical CO2 to dry, obtain aerogel, heat and reduce calcination to obtain (Ca, Mg) SiO3-ZrO2 nanopowder, and use atomic layer deposition technology to coat a TiO2 layer on the surface of the nanopowder to obtain ultrafine particles of dielectric ceramic materials. The ceramic particles prepared by the present invention not only have a low dielectric constant, but also have a smaller particle size and a higher density under low-temperature sintering.

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 relates to a carbitol-containing anti-caking water-soluble fertilizer and a preparation method thereof, and belongs to the field of water-soluble fertilizer production, the carbitol-containing anti-caking water-soluble fertilizer comprises the following substances by weight: 0.15-0.2% of carbitol, 20-28% of diammonium hydrogen phosphate, 22-28% of ammonium nitrate, 40-50% of potassium sulfate, 3-5% of magnesium nitrate, and 2-4% of ferric citrate. According to the invention, carbitol is applied to anti-caking of the water-soluble fertilizer for the first time, and integration of anti-caking, stability improvement and function synergism is realized; by adding carbitol, caking of the water-soluble fertilizer can be effectively avoided, a green and efficient technical scheme is provided for improving the quality of the water-soluble fertilizer, and the storage and use cost is reduced.

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 application discloses a kind of step-by-step doping preparation ultra-thin BME ceramic dielectric capacitor and preparation method, and the ultra-thin BME ceramic dielectric capacitor is by dielectric layer and dielectric layer mutual superposition and is fired, the dielectric layer includes dielectric layer and electrode printed on dielectric layer, the dielectric layer includes the following raw materials: coated BSCT main matrix, liquid flux agent;Coated BSCT main matrix includes the following raw materials: BSCT material, magnesium nitrate, manganese acetate, oxovanadium oxalate, rare earth nitrate;Liquid flux agent is by nano copper oxide, tetraethyl orthosilicate, tributyl borate in proportion, targeted doping is carried out by step-by-step doping, and new three-layer structure is formed to obtain good comprehensive performance.

The invention provides a method for improving combustibility of cigar tobacco leaves and ash gray and application of the method, and belongs to the technical field of tobacco production processes. The method comprises the following steps: harvesting naturally mature fresh raw tobacco leaves, cutting the petiole ends of the raw tobacco leaves into wedge shapes, and soaking the petiole ends of the raw tobacco leaves in a composite synergist mother solution for 1-2 days; and airing the raw tobacco leaves subjected to stem soaking to obtain the cigar raw tobacco leaves. The composite synergist mother liquor comprises the following components in percentage by mass: 5-8% of water-soluble sylvite, 6-9% of water-soluble calcium salt and 7-10% of water-soluble magnesium salt. The water-soluble potassium salt is monopotassium phosphate or potassium nitrate; the water-soluble calcium salt is calcium nitrate; the water-soluble magnesium salt is magnesium nitrate, magnesium sulfate or chelated magnesium. By means of the method, the smoldering time of the tobacco leaves can be remarkably prolonged, and cigarette ash becomes white.

The invention discloses a low-expansion cordierite-mullite composite ceramic roller and a preparation method thereof, and relates to the technical field of ceramic rollers. Aluminum nitrate, magnesium nitrate and a silicon dioxide solution are used as raw materials, glycine is used as fuel, cordierite-mullite precursor micro-powder is prepared through a solution combustion synthesis method, then the cordierite-mullite precursor micro-powder, emery, kaolin and a binder are mixed to prepare a ceramic roller rod mixture, and the ceramic roller rod mixture is sintered to obtain the ceramic roller rod. Prefabricating the mixture into a green body through a forming process; and drying and sintering the green body in sequence to finally prepare the low-expansion cordierite-mullite composite ceramic roller which is low in thermal expansion coefficient, good in thermal conductivity, high in strength and strong in bending resistance. According to the preparation method, the firing temperature of the cordierite-mullite composite ceramic roller can be reduced, it is ensured that cordierite cannot be decomposed in the process of preparing the cordierite-mullite composite ceramic roller, and meanwhile it is ensured that a long-column-shaped mullite phase which is good in crystal grain development and distributed in a net-shaped and crossed mode is generated.

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 invention discloses a method for preparing calcium sulfate and magnesium oxide and recovering nitric acid from a calcium and magnesium containing leaching solution of a chemical mineral separation byproduct. The method comprises the following steps: carrying out decalcification treatment on the calcium and magnesium containing leaching solution to obtain calcium sulfate and a decalcification solution containing dilute magnesium nitrate; evaporating the decalcified filtrate to obtain a solid-liquid mixture containing 72-76% of magnesium nitrate crystals; mixing dilute nitric acid with the solid-liquid mixture for reaction to obtain high-concentration nitric acid steam and a solid-liquid mixture of 52-56% magnesium nitrate crystals; separating the solid-liquid mixture to obtain magnesium nitrate crystals; dehydrating the magnesium nitrate crystal, and performing thermal decomposition to obtain magnesium oxide and a gas mixture; treating the nitric acid steam through a stripping section and a rectifying section of the concentration tower to obtain nitric acid steam with the concentration of 98% or above; nitric acid steam enters the bleaching tower to react to obtain finished nitric acid and concentrated nitric acid, and part of concentrated nitric acid flows back to the bleaching tower and the rectifying section of the concentration tower. According to the method, efficient utilization of chemical mineral separation byproducts is achieved, high-purity calcium sulfate and magnesium oxide products are prepared, and efficient recycling of nitric acid is achieved.

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 invention provides a micromolecular organic carbon water-soluble fertilizer for promoting lignification of eucalyptus, and a preparation method and application thereof, and belongs to the technical crossing field of microorganisms, forestry and organic water-soluble fertilizers. The micromolecular organic carbon water-soluble fertilizer for promoting eucalyptus lignification comprises the following components in parts by weight: 3-5 parts of a biological agent, 10-20 parts of food industry leftovers, 20-30 parts of an organic solid fertilizer, 5-15 parts of sodium silicate, 10-20 parts of monocalcium phosphate, 5-15 parts of potassium chloride, 5-15 parts of magnesium nitrate, 5-15 parts of sulfur coated urea, 0.1-0.5 part of a rooting agent, 0.5-1 part of a trace element composite nutrient solution, 5-50 parts of deionized water and 1-3 parts of a pH regulator. The biological agent is prepared by fermenting a new bacillus tequilensis strain, namely, bacillus tequilensis XD63Y, and the collection number of the bacillus tequilensis XD63Y is GDMCC No: 62521. The organic solid fertilizer is prepared by crushing plant straws and then performing composting or fermentation treatment. The micromolecular organic carbon water-soluble fertilizer provided by the invention can promote the growth and lignification process of the eucalyptus, shorten the growth cycle of the eucalyptus, increase the yield of the eucalyptus and enhance the disease and pest resistance of the eucalyptus.

The invention provides a preparation method and application of a chitin modified magnesium oxide fluorine removal agent, and belongs to the technical field of wastewater treatment.The preparation method of the chitin modified magnesium oxide fluorine removal agent comprises the steps that magnesium nitrate is taken and added into water, nitric acid is added to adjust the pH value, then chitin is added, stirring and dispersing are conducted, sodium hydroxide is added while stirring is conducted to adjust the pH value, stirring continues to be conducted, and filtering is conducted to obtain the chitin modified magnesium oxide fluorine removal agent. And drying and calcining. The application comprises the following steps: adding the chitin modified magnesium oxide fluorine removal agent into coking wastewater, stirring for reaction, and filtering. The preparation method disclosed by the invention is simple to operate, and the prepared chitin modified magnesium oxide fluorine removal agent is relatively small and stable in particle size, and can effectively remove fluorine ions in wastewater.

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 present invention discloses a medical titanium-based metal functional coating and a preparation method thereof. The preparation method comprises the following steps: subjecting a pretreated titanium-based metal substrate A to an alkali heat treatment, washing with water, and drying to obtain a hydroxylated substrate B; subjecting substrate B to ion exchange, and then washing with water and drying to obtain substrate C; dissolving magnesium nitrate and silver nitrate as metal salts and 2,5-dihydroxyterephthalic acid as an organic ligand in a solvent, mixing them uniformly to obtain a precursor solution, immersing substrate C in the precursor solution for a hydrothermal reaction, and cooling to obtain substrate D; replacing excess organic ligands in substrate D, and drying to obtain a medical titanium-based metal functional coating. The medical titanium-based metal functional coating prepared by the present invention has good antibacterial properties and corrosion resistance, and good biocompatibility.

A method of producing magnesium cement. The method may comprise mixing water at a temperature of between approximately 50° C. and 100° C., a magnesium oxygen-containing compound and a magnesium salt. In some embodiments, the water is heated to a temperature of between approximately 70° C. and 90° C. 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.