6161 results about "Phosphate" patented technology

The present invention relates to a sodium-ion battery material, and specifically relates to a sodium ferric phosphate pyrophosphate composite material, and a preparation process, evaluation method and process optimization method therefor and the use thereof. The sodium ferric phosphate pyrophosphate composite material has a spinel-type NaFePO4 phase; and in an XRD diffraction pattern obtained by subjecting the sodium ferric phosphate pyrophosphate composite material to XRD diffraction using CuKα radiation, there are a characteristic diffraction peak T of sodium ferric phosphate pyrophosphate and a characteristic diffraction peak O of spinel-type NaFePO4 at 2θ of 33.6±0.2° and 32.8±0.2°, respectively, the peak intensities thereof are respectively IT and IO, and the diffraction peak intensity ratio Ir is equal to IT / IO, wherein 6.19≤Ir≤13.

The invention discloses a preparation method of a high-compaction lithium manganese iron phosphate positive electrode material, which comprises the following steps: placing a manganese source, an iron source and a phosphorus source in deionized water, stirring, carrying out primary high-speed ball milling, carrying out constant-temperature water bath, adding an oxidizing agent, stirring and oxidizing, and drying the slurry to obtain manganese iron phosphate precursor powder; carrying out primary sintering on the ferromanganese phosphate precursor powder to obtain a ferromanganese phosphate primary sintering material; putting the ferromanganese phosphate primary sintering material into deionized water, adding a lithium source and a carbon source at the same time, and performing stirring, secondary high-speed ball milling and drying to obtain lithium ferromanganese phosphate precursor powder; and carrying out secondary sintering on the lithium manganese iron phosphate precursor powder to obtain the high-compaction lithium manganese iron phosphate positive electrode material. The void ratio is well reduced and good carbon coating is realized by means of secondary grinding and secondary sintering, and compared with the prior art, the method has the advantages that good capacity can be maintained, the powder compaction density of the material can be improved, the conductivity can be improved, and the specific surface area of the material can be effectively reduced.

The invention relates to the technical field of lithium iron phosphate production, and discloses a carbon-coated titanium-doped lithium iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the following steps that 1, a ferrous solution and a phosphorus source solution are mixed in proportion, dopamine hydrochloride is added, a pH regulator is dropwise added in the stirring state, the pH of the solution is adjusted to 4.0-5.5, a reaction is conducted, a titanium source solution is added, and a reaction solution is obtained; after uniformly stirring, continuously dropwise adding a pH regulator to regulate the pH value of the solution to 5.5-6.5; the iron phosphate octahydrate coated with the titanium-embedded polydopamine is obtained; 2) calcining the titanium-embedded polydopamine-coated ferrous phosphate octahydrate in an inert gas atmosphere to obtain carbon-coated titanium-doped anhydrous ferrous phosphate; 3) mixing the carbon-coated titanium-doped anhydrous ferrous phosphate with lithium phosphate and a carbon source, ball-milling, mixing, spray-drying and calcining to obtain a carbon-coated titanium-doped lithium iron phosphate positive electrode material; the synthesis process is simple, and energy consumption is reduced.

A fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a first alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a second alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, sodium benzoate (SB), for providing metal sodium ions dispersed in the water when the at least one alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent and also inhibiting surface corrosion reactions involving metals contacting the mixed retardant solution, including specific metals, namely 2024-T3 Aluminum, 4130 Steel, Yellow Brass, and Az31B Magnesium; a minor amount of thickening agent in the form of a biomolecular polymer consisting of polysaccharides, for increasing the viscosity of the mixed retardant liquid during application operations; a minor amount of coloring agent in the form of fugitive color dye powder, or non-fugitive pigment powder, for imparting a visible color (e.g. red or green) when the fire retarding biochemical liquid composition is applied to a surface to be protected against fire, as water molecules in the retardant liquid coating evaporate to the environment during drying, to form a thin fire retardant coating deposited on the treated surfaces having a characteristic visible color, and comprising potassium and sodium salt crystals mixed within the polysaccharides of the biomolecular polymer. Wet and dry concentration formulations of the fire retarding biochemical liquid composition are disclosed for use with both serial and ground delivery methods and apparatus.

The invention relates to a preparation method and application of a manganese ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrodes. The preparation method comprises the following steps: adding a sodium source, a phosphorus source and a carbon source into ethanol, uniformly mixing to form a mixed solution, sequentially adding an iron source and a manganese source into the mixed solution, uniformly mixing to form slurry, and drying the slurry to obtain precursor powder; calcining in a protective atmosphere to obtain a manganese-doped carbon-coated ferric pyrophosphate sodium material; the calcining conditions are as follows: heating to the temperature of 300-350 DEG C at the heating rate of 2-3 DEG C / min, carrying out first-stage constant-temperature calcination for 2-3 hours, heating to the temperature of 500-550 DEG C at the heating rate of 5-8 DEG C / min, and carrying out second-stage constant-temperature calcination for 10-12 hours. By doping the manganese ions, the electronic conductivity and the ion diffusivity of the ferric sodium phosphate pyrophosphate composite material are improved, so that the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, and the battery has relatively high cycle stability.

The invention relates to the field of solidified soil, and particularly discloses solid-waste-based premixed flow-state solidified soil and a preparation method thereof. The solid-waste-based premixed flow-state solidified soil comprises soil, water and a curing agent according to the weight ratio of (28-36): (50-54): (6-9), according to the total weight of the curing agent, the curing agent comprises the following components in parts by weight: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea sludge, 1-3 parts of a water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulphoaluminate, 3-10 parts of a fiber reinforced material and 1-3 parts of phosphate. The problems that stress generated by the solidified soil in the hydration process is excessively concentrated and shrinkage is excessive can be solved, and therefore cracking of the solidified soil subjected to premixed flow state solidification is reduced.

The invention provides an iron-based phosphate positive electrode material as well as a preparation method and application thereof. The preparation method of the positive electrode material comprises the following steps: reacting a mixed material containing metallic iron and a phosphorus source at normal temperature to 100 DEG C to form a solid-liquid mixture containing a phosphate iron salt compound; mixing the solid-liquid mixture with an acidity regulator, a carbon source and a sodium source, and sanding to obtain slurry; performing drying treatment on the slurry to obtain a precursor material; and sintering the precursor material under a protective atmosphere condition to obtain the iron-based phosphate positive electrode material. According to the method provided by the invention, the metal iron and the phosphorus source do not need to be mixed and completely dissolved to form a solution in the reaction process, and anhydrous iron phosphate does not need to be formed firstly, so that the method for preparing the iron-based phosphate positive electrode material is short in process and relatively low in requirements on reaction conditions, and is applicable to industrial production and large-scale production.

The invention relates to the technical field of intelligent control, in particular to a monopotassium phosphate intelligent control method and system.The method comprises the following steps that rhizosphere phosphorus and potassium concentration changes are obtained, whether the rhizosphere phosphorus and potassium concentration changes are in a critical rate interval or not is judged, an effective absorption time period identifier is generated, and an organ amplification ratio is analyzed to judge a cooperation period; and extracting a stalk concentration ratio, comparing the stalk concentration ratio with a reference interval to generate an application inhibition identifier, fusing information to judge a fertilization window, adjusting the concentration according to the root hair amplification and the water consumption rate, and generating a control instruction set. According to the method, the effective time period of phosphorus and potassium nutrient absorption of the crops is determined through crop rhizosphere phosphorus and potassium ion concentration difference calculation and average treatment, the objective interval of crop nutrient absorption rate indexes is defined, blind fertilization is avoided, the pertinence and accuracy of nutrient absorption and utilization of the crops are enhanced, the excessive application state of nutrient elements is dynamically identified, and the crop quality is improved. The risk of excessive nutrients caused by nutrient enrichment of crops is prevented, and resource waste and environmental burden are effectively reduced.

The invention discloses a polymeric phosphorus slow-release compound fertilizer and a preparation method thereof, and relates to the technical field of agricultural fertilizers, the polymeric phosphorus slow-release compound fertilizer comprises an inner core and a coating layer, wherein the inner core is prepared from the following components in percentage by weight: 30 to 50 percent of modified ammonium polyphosphate, 15 to 25 percent of urea-formaldehyde slow-release nitrogen, 10 to 20 percent of potassium humate-coated potassium chloride, 2 to 5 percent of amino acid chelated trace elements and 1 to 3 percent of seaweed extract; through the synergistic effect of the citric acid modified ammonium polyphosphate and the three layers of functional envelopes, the phosphorus utilization rate is increased, and the problem that phosphorus is easily fixed by soil is effectively solved. The fertilizer can automatically adapt to different soil environments through the pH responsive coating design, and 30-40% of phosphorus can be quickly released in acid soil to meet the early needs of crops; phosphorus is continuously supplied through activation of the phosphate solubilizing bacteria under a neutral condition; and the fertilizer efficiency is prolonged to 120-150 days by virtue of an outer layer slow release mechanism in an alkaline environment.

The present application relates to the field of wastewater treatment, and provides a treatment system and method for electroless nickel-plating waste liquid. The treatment system comprises a decomplexing pretreatment system; an oxidation-decomplexing system comprising a redox reactor and a decomplexing reactor which are connected in sequence, wherein an oxidizing agent in the redox reactor is oxygen, and an oxidizing agent in the decomplexing reactor is hydrogen peroxide; a chemical precipitation system comprising a neutralization reaction tank and a sedimentation tank which are connected in sequence, wherein the sedimentation tank is equipped with a filter system; and an evaporation crystallization system comprising an evaporation device, a crystallization device, and a separation device which are arranged in sequence. In the treatment system and method for electroless nickel-plating waste liquid, a two-stage oxidation method is employed to achieve oxidation and decomplexing of the waste liquid; in addition, combining chemical precipitation treatment and evaporation crystallization treatment not only reduces the waste liquid treatment cost but also avoids the introduction of other impurities, and allows for the separation of nickel salts and phosphate salts, so that the operation is easy and convenient, the treatment cost is low, the nickel removal rate is high, and resource utilization of nickel is facilitated.

The invention provides a sewage treatment carbon source adding control method, and relates to the technical field of sewage treatment, and the method comprises the following steps: obtaining water inlet parameters of a water inlet end of sewage to be treated and process parameters of a treatment section, the water inlet parameters comprising chemical oxygen demand, total nitrogen, total phosphorus and flow; the process parameters comprise the phosphate concentration at the tail end of an anaerobic tank, the nitrate concentration at the tail end of an anoxic tank, and the total nitrogen and chemical oxygen demand of inlet water of a denitrification filter tank; dynamically calculating a predicted carbon-nitrogen ratio and a predicted carbon-phosphorus ratio in real time according to water inlet parameters and the process parameters; based on the predicted carbon-nitrogen ratio, the predicted carbon-phosphorus ratio and a preset effluent quality standard, a carbon source adding point and a first carbon source adding amount are determined, and the carbon source adding point comprises at least one of an anaerobic tank, an anoxic tank and a denitrification filter tank; according to the carbon source feeding point and the first carbon source feeding amount, the carbon source feeding device is controlled to execute corresponding feeding operation, through segmented feeding and closed-loop control, COD standard exceeding caused by excessive carbon sources is avoided, and secondary pollution is effectively inhibited.

The invention provides a special charcoal-based slow-release fertilizer for sandy soil as well as a preparation method and application thereof, and belongs to the technical field of fertilizers. The special charcoal-based slow-release fertilizer for the sandy soil is prepared from amino modified biomass charcoal, urea, urea formaldehyde, monoammonium phosphate, potassium sulfate, polyglutamic acid, fulvic acid, clay, attapulgite, a compound microbial agent and sodium alginate. The compound microbial agent is prepared from halomonas (ACCC 11681), bacillus subtilis (ACCC 60429) and bacillus mucilaginosus (ACCC 10094), and the compound microbial agent is prepared from bacillus subtilis (ACCC 60429) and bacillus mucilaginosus (ACCC 10094). The invention further provides a preparation method and application of the special charcoal-based slow-release fertilizer for the sandy soil. The special charcoal-based slow-release fertilizer for the sandy soil can remarkably improve the water and fertilizer retention capacity of the sandy soil, improve the farmland productivity of the sandy soil, save fertilizer and water input and improve the yield and quality of crops.

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

The invention relates to the technical field of low-carbon olefin hydration, and discloses a modified hydrated filler as well as a preparation method and application thereof. The modified hydrated filler comprises a filler matrix, and a silane layer, a modified layer A and a modified layer B which are sequentially coated on the outer surface of the filler matrix from inside to outside, the modified layer A contains a pyrrolyl group, an amido group and a furyl group; the modified layer B contains phenoxy, pyrrolyl, furyl, sulfonic acid group, phosphate group and acylamino. The modified hydrated filler provided by the invention can obviously improve the mixing effect of water and alkene and promote the improvement of the yield of low-carbon alcohol.

The invention discloses a phosphorus removal filler and a preparation method and application thereof, and belongs to the technical field of fillers. Sulphoaluminate cement, chitosan, sodium alginate and calcium peroxide are uniformly mixed in a nitric acid solution in an amino-containing coupling agent, then foaming and pore forming are performed under steam, and the phosphorus removal filler is prepared. And finally, uniformly mixing with titanium dioxide, sodium silicate, a ferrous sulfate solution and sodium borohydride to obtain the phosphorus removal filler with an excellent phosphorus removal effect, and the phosphorus removal filler has a rich pore structure and adsorption activity, can sufficiently perform physical adsorption on phosphorus elements, and has a good phosphorus removal effect. Meanwhile, the phosphorus removal filler further has excellent surface complexing activity and photocatalysis, insoluble salt precipitates can be generated through reaction of iron elements and calcium elements and phosphate in water, so that total phosphorus is removed, the material is ground after adsorption saturation and put into a fish pond to serve as a phosphorus supplementing material, resource recycling can be achieved, and the cost is reduced. Wide application prospects are realized.

The invention discloses a preparation method and application of an amorphous nickel-cobalt-iron phosphate anode catalyst, and belongs to the technical field of alkaline water electrolysis hydrogen production, the preparation method comprises the following steps: (1) dissolving transition metal salt in a solvent, and stirring to obtain a metal salt solution; (2) dissolving phosphate in a solvent, and stirring to obtain a phosphate solution; and (3) adding the phosphate solution into the metal salt solution for reaction, washing with deionized water and ethanol, centrifugally separating, and drying to obtain the amorphous nickel-cobalt-iron phosphate anode catalyst. According to the preparation method and application of the amorphous nickel-cobalt-iron phosphate anode catalyst, process safety improvement and environmental friendliness optimization are achieved through an all-water-phase green synthesis system, the obtained catalyst shows excellent performance in an AEM electrolytic cell, the cell voltage is only 1.87 V under the current density of 2 A / cm, and the method has remarkable industrial application prospects.

The invention belongs to the technical field of flame-retardant macromolecules, and particularly relates to intrinsic heat-conducting flame-retardant recycled epoxy resin and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out a reaction on diethanol amine and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) to obtain an intermediate A; and (2) carrying out condensation polymerization on the intermediate A and phenylphosphonic acid to prepare the phosphate-terminated polyester flame retardant (PEF). And (3) carrying out epoxidation on 4, 4 '-biphenol to prepare the liquid crystal epoxy precursor LEP. And (4) mixing PEF, LEP and 3, 3 '-dithiodipropionic acid, and heating and curing to prepare the epoxy resin. The prepared epoxy resin has intrinsic heat conduction, flame retardance and efficient recoverability, and is a high polymer material with great potential.

The invention discloses battery-grade iron phosphate and a preparation method and application thereof.The method comprises the steps that 1, waste iron sheets are ground into iron powder to be mixed with a phosphoric acid solution, reduced iron powder, ascorbic acid and chloramine-T are added in the mixing process for a reaction, solid-liquid separation is conducted after the reaction, a ferrous dihydrogen phosphate solution is obtained, and the pH of the ferrous dihydrogen phosphate solution is 1.5-3.0; and (2) oxidizing the ferrous dihydrogen phosphate solution into iron phosphate in one step by adopting an oxidizing agent, carrying out solid-liquid separation to obtain an iron phosphate solid, washing and drying the iron phosphate solid, and roasting in an inert atmosphere environment to obtain the battery-grade iron phosphate. According to the invention, the use of high-cost reduced iron powder is reduced, and the produced iron phosphate has the characteristics of high iron-phosphorus ratio and high tap density, has certain carbon content, and has a wide prospect in the application of lithium iron phosphate.

The invention belongs to the technical field of sewage treatment, and particularly relates to a demulsifier for eliminating an oil-water interface emulsion layer in oilfield produced liquid treatment and a preparation method of the demulsifier. The preparation method comprises the following steps: adding acrylamide, 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, allyl tributyl phosphonium chloride and deionized water into a first reactor, and heating and dissolving the acrylamide, the 1-allyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imine salt, the allyl tributyl phosphonium chloride and the deionized water; adding allyl (diisopropylamino) dimethylsilane, butyl acrylate, deionized water, octylphenol polyoxyethylene ether-10, lauryl sodium sulfate and monopotassium phosphate into the second reactor, and stirring to obtain an emulsion; adding an initiator and sodium hydrogen sulfite into a second reactor, carrying out heating and heat preservation reaction, pouring the mixed solution in the first reactor, and continuously carrying out reaction, heating and heat preservation to obtain a viscous liquid; and drying and granulating the viscous liquid to obtain the demulsifier. The demulsifier provided by the invention has the characteristics of simple synthesis process and high demulsification rate.

The invention discloses a Ca / Mg-based modified biochar material and a preparation method and application thereof, and the preparation method comprises the following steps: pretreatment: drying a biomass material shaddock peel, crushing, sieving, washing and drying, then carrying out acid leaching activation, washing again and drying to obtain high-activity biomass powder for later use; dipping modification: fully mixing the high-activity biomass powder obtained in the pretreatment step with CaO and MgO, adding distilled water, dipping under heating and stirring conditions, then carrying out solid-liquid separation, washing a filter cake for multiple times, freeze-drying, and sieving to obtain an intermediate product; the intermediate product is calcined, naturally cooled, washed and dried, and the Ca / Mg-based modified bimetallic modified charcoal material is obtained and can be applied to adsorption of phosphate in a wastewater solution as an adsorbent. The preparation method is simple, the raw materials are easy to obtain, the cost is low, the material stability is good, the pH adaptability is good, the adsorption effect is good, and the method is suitable for water environments with more complex pollution factors.

The invention relates to the technical field of environment-friendly biological rare earth recovery, in particular to methylobacterium extorquens C2 and a method for leaching rare earth elements in waste by using the methylobacterium extorquens C2. Specifically, the strain provided by the invention utilizes microorganisms and metabolites thereof to leach rare earth elements in the waste and mineralize nano or micron rare earth phosphate in cells, so that the problems of large chemical reagent dosage, high production cost, serious environmental pollution and the like in the chemical leaching process of the rare earth waste are solved. The strain provided by the invention is low in culture cost, high in growth speed and simple in leaching condition, has the capability of leaching rare earth ions in various wastes, and has a relatively good application prospect in the aspects of rare earth waste microorganism recovery and reutilization and the like.

The invention relates to a modified chrome corundum ramming material and a preparation and construction process thereof, and belongs to the technical field of chrome corundum ramming materials. The ramming material comprises a material A, a material B and a material C, wherein the material A comprises chrome corundum aggregate, titanium dioxide coated aluminum oxide microspheres, calcium sulfide dehydrate and silicon carbide porous microspheres; the material B comprises chromium oxide-zirconium oxide composite nano powder, sodium thiosulfate pentahydrate, tricalcium phosphate and hexagonal boron nitride flaky crystals; and the material C comprises an aluminum dihydrogen phosphate-magnesium hydroxide compound, a calcium fluoride-aluminum oxide co-melt and a silane coupling agent. The preparation process comprises the steps of pretreatment of all the components, preparation of composite powder and layered preparation. The construction process comprises the steps of pretreatment, wet-process mixing, layered ramming, negative-pressure permeation, medium-temperature reaction, spraying curing, integral firing and the like. Generation of hexavalent chromium can be effectively inhibited, the thermal shock resistance, the mechanical strength and the heat-conducting property of the material are remarkably improved, and the material has the advantages of being good in environment friendliness, long in service life, excellent in construction performance and the like.

The invention discloses a potassium fulvate chelated macroelement water-soluble fertilizer with stress resistance and growth promotion functions, and relates to the technical field of water-soluble fertilizers, the potassium fulvate chelated macroelement water-soluble fertilizer comprises the following raw materials by weight: 167-210 parts of mineral source potassium fulvate, 450-460 parts of potassium nitrate, 300-310 parts of urea, 150-160 parts of potassium dihydrogen phosphate, 30-40 parts of potassium sulfate, 15-25 parts of EDTA-disodium, and 5-15 parts of citric acid. 0.5 to 1.5 parts of brassinolide and 4 to 6 parts of polyaspartic acid; according to the potassium fulvate chelated macroelement water-soluble fertilizer with the stress-resistant and growth-promoting functions, through chelation cooperation of potassium fulvate and nitrogen, phosphorus and potassium, the solubility of the chelated phosphorus element in water is increased, and the chelated phosphorus element can be more uniformly distributed in soil; by adopting an EDTA-disodium and citric acid composite chelating system, volatilization and loss of nitrogen elements are reduced, the problem of precipitation of calcium, magnesium and phosphorus is solved, and the soil conditioner is suitable for hard water areas and especially has outstanding performance in saline-alkali soil and arid areas.

The present application provides a control method for adding a carbon source to sewage treatment, which relates to the technical field of sewage treatment, comprising the following steps: obtaining water inlet parameters of the sewage to be treated and process parameters of the treatment section, the water inlet parameters including chemical oxygen demand, total nitrogen, total phosphorus and flow rate, and the process parameters including phosphate concentration at the end of the anaerobic tank, nitrate concentration at the end of the anoxic tank, total nitrogen and chemical oxygen demand of the denitrification filter inlet; dynamically calculating and predicting the carbon-nitrogen ratio and the carbon-phosphorus ratio in real time based on the water inlet parameters and the process parameters; determining a carbon source addition point and a first carbon source addition amount based on the predicted carbon-nitrogen ratio, the predicted carbon-phosphorus ratio and a preset effluent water quality standard, the carbon source addition point including at least one of the anaerobic tank, the anoxic tank and the denitrification filter; controlling a carbon source addition device to perform corresponding addition operations based on the carbon source addition point and the first carbon source addition amount, and avoiding excessive COD caused by excessive carbon source through segmented addition and closed-loop control, thereby effectively suppressing secondary pollution.

The invention discloses a phosphate composite flame retardant and a preparation method thereof, and relates to the technical field of flame retardants. The phosphate ester composite flame retardant is prepared from phosphorus-nitrogen grafted and coated network-shaped silicon dioxide powder, a Co-MOF composite graphene oxide catalytic carrier and pentaerythritol phosphate ester, the phosphorus-nitrogen grafted coated network-shaped silicon dioxide powder is prepared from a network-shaped dispersion modifier, silicon dioxide, dopamine hydrochloride, phosphorus oxychloride and 4, 4-diaminodiphenyl methane, a Co-MOF composite graphene oxide catalytic carrier is filled with phosphorus-nitrogen grafted and coated network-shaped silicon dioxide powder and pentaerythritol phosphate, migration of components is effectively reduced, the thermal stability of a flame-retardant system is enhanced, meanwhile, the compatibility and dispersity in an epoxy resin matrix are improved, the phosphorus-nitrogen grafted and coated network-shaped silicon dioxide powder, the pentaerythritol phosphate and the phosphorus-nitrogen grafted and coated network-shaped silicon dioxide powder have a synergistic effect, and the flame-retardant effect is improved. A carbon residue layer after combustion is more compact and continuous, isolation and protection effects can be better played, and the flame retardant property is remarkably improved.

The invention relates to the technical field of surface coating materials, in particular to a multifunctional surface coating which comprises the following raw materials: organic silicon modified acrylic resin, an intumescent flame retardant, hollow glass beads, nano titanium dioxide, an auxiliary agent, graphene, silver nanoparticles and flaky zinc powder. The intumescent flame retardant is formed by compounding melamine polyphosphate and pentaerythritol, and the auxiliary agent comprises a dispersing agent, a flatting agent and a plasticizer. By integrating multiple functions of fire prevention, water prevention, heat insulation, self-cleaning and the like into a whole, the complex requirements of different fields of buildings, industry, traffic and the like on material performance can be comprehensively met. In the application of building exterior walls, the fireproof safety, the waterproof sealing performance and the heat insulation performance of buildings can be effectively improved, and energy consumption is reduced; in the aspect of industrial equipment protection, equipment can be protected from being damaged by environmental factors such as high temperature, moisture and corrosion, and the service life of the equipment is prolonged.

The invention discloses a spray tower for producing diphenyl azide phosphate, and relates to the technical field of spray towers, the spray tower comprises a tower body, the bottom of the side end of the tower body is provided with a gas inlet pipe, the top of the tower body is provided with a gas outlet pipe, the inner wall of the tower body is fixedly provided with a circular plate and a connecting ring, the connecting ring is located above the circular plate, and the circular plate is fixedly connected with the gas outlet pipe. A circular frame is arranged between the circular plate and the connecting ring, through holes are formed in the circumference of the surface of the circular plate at equal intervals, the circular frame comprises a plurality of circular rings and fixing pieces, the circular rings are distributed in a concentric circle mode, and the circular rings are fixedly connected through the fixing pieces. According to the invention, by cooperatively adjusting the opening degree of the gas outlet pipe, the gaps of the through holes of the circular plate and the gaps of the diffusion ports of the fan-shaped assembly, the gas-liquid flowing and reaction conditions in the spray tower can be accurately controlled, so that the waste gas and the spray liquid are fully contacted and reacted, and the waste gas treatment efficiency and quality in the production process of diphenyl azido phosphate are improved.

A method for preparing modified iron(III) phosphate, comprising the following steps: (1) preparing NH2-MIL-53(Al) nanoparticles, mixing the nanoparticles with a solvent, adding an acid solution, and heating and stirring the mixture to obtain hollow NH2-MIL-53(Al) powder; (2) using the hollow NH2-MIL-53(Al) powder to prepare a dispersion, mixing the dispersion with an iron salt solution, stirring and then drying the mixture, mixing the resulting powder with a phosphorus source solution, controlling the pH, and carrying out a reaction; and (3) carrying out sintering treatment on a material resulting from aging to obtain the modified iron(III) phosphate. Provided are iron(III) phosphate prepared according to the method and a positive electrode material. In the method, a hollow metal organic framework nanomaterial is used as a template to provide a micro reaction area for the synthesis of iron(III) phosphate, so that the microscopic morphology of the prepared iron(III) phosphate is restrained and controlled to prepare nanoscale iron(III) phosphate having a polyhedral structure.

The invention relates to the technical field of drug analysis and detection, and provides a detection method of moxifloxacin hydrochloride related substances. The related substances of moxifloxacin hydrochloride are detected by adopting a high performance liquid chromatography method, and the detection conditions are as follows: octadecylsilane chemically bonded silica is taken as a filling agent of a chromatographic column; the wavelength of a UV detector is 296 nm; the column temperature is 35-45 DEG C; the flow velocity of the mobile phase is 1.6-1.8 ml / min; the sample injection volume is 10-50 [mu] l; the mobile phase A is phosphate buffer solution-acetonitrile-methanol; the mobile phase B is phosphate buffer solution-acetonitrile-methanol; the elution mode is gradient elution; the diluent is a mobile phase A; according to the method provided by the invention, effective separation between moxifloxacin hydrochloride and various impurities can be realized, the sensitivity is high, the accuracy is good, the reproducibility is relatively good, a good linear relation is shown in a certain range, and qualitative and quantitative determination can be carried out on various impurities in moxifloxacin hydrochloride bulk drugs.

The invention relates to the technical field of catalysts, and discloses a preparation method of a supported catalyst for catalytic cracking oil slurry hydrogenation, and the preparation method comprises the following steps: S1, adding a phosphorus-containing compound into a carrier for modification: putting the carrier, phosphate and phosphoric acid into a round-bottom flask, adding water, and stirring for reaction to obtain a P element modified carrier; s2, dissolving a main active component of the catalyst in deionized water, then slowly adding into the P element modified carrier prepared in the step S1, and reacting to obtain a carrier loaded with the catalyst; and S3, roasting the catalyst-loaded carrier prepared in the step S2 to obtain the supported catalyst. According to the supported catalyst, a phosphorus compound modified carrier is adopted, and Ni-W-Mo or Ni-W active metal components are supported. The acid site of the carrier is optimized by adding the phosphorus element, and the surface acidity and the acid amount of the catalyst are optimized and adjusted by using a preparation process combining a microwave method and a co-impregnation method, so that the thermal stability of the catalyst is improved.