532 results about "Potassium nitrate" patented technology

The present invention discloses a perfluoromethylcyclohexanone microcapsule fire extinguishing medium and its preparation process, which relates to the field of fire fighting technology. A perfluoromethylcyclohexanone microcapsule fire extinguishing medium is composed of a core material and a shell material. The core material includes perfluoromethylcyclohexanone, silicon dioxide, and azobisisobutyronitrile. The shell material includes modified guar gum, acrylic resin, aluminum hydroxide, potassium nitrate, and an emulsifier. The modified guar gum is prepared by the following method: tetrahydrofuran, guar gum, and triethylamine are sequentially added into a reactor, stirred and mixed evenly, and then a tetrahydrofuran solution of diphenylphosphinyl chloride is added dropwise. After the addition is completed, the temperature is raised to 75-85°C and the reaction is carried out for 10-14 hours, followed by post-treatment to obtain diphenylphosphinyl chloride-modified guar gum. The present invention modifies guar gum with diphenylphosphinyl chloride and then uses the modified guar gum for the shell material of perfluoromethylcyclohexanone microcapsules, improving the fire extinguishing performance, heat resistance, and long-term stability of perfluoromethylcyclohexanone microcapsules.

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 utility model discloses a firework and cracker waste recycling system. Comprising a negative pressure adsorption treatment part, a part for separating potassium perchlorate from waste aluminum powder, a part for separating potassium perchlorate from waste residues, a part for recycling potassium perchlorate and potassium nitrate and a part for treating residues generated by all the parts. According to the firework and firecracker waste recycling system, potassium perchlorate, potassium nitrate, waste sulfur, waste aluminum powder and metal oxide in the firework and firecracker waste can be effectively recycled by recycling the firework and firecracker waste, and all the recycled waste is used as firework and firecracker raw materials after being dried. The system is good in continuity, simple to operate, low in investment cost and simple in equipment layout, and can be popularized and used.

The invention relates to a preparation method of a multi-site silver (Ag) and nickel hydroxide (Ni (OH) 2) modified copper (Cu) nanowire catalyst (Ag-Ni (OH) 2) / Cu NW) and application of the multi-site silver (Ag) and nickel hydroxide (Ni (OH) 2) modified copper (Cu) nanowire catalyst. A cation exchange and electrodeposition method is adopted to prepare an electrocatalytic nitrate reduction reaction NO3-RR series catalyst with three sites of Ag, Ni (OH) 2 and Cu. Based on the synergistic effect of three sites, Ag in the catalyst promotes conversion from nitrate NO3 <-> to nitrite NO2 <->, Ni (OH) 2 promotes dissociation of water H2O to generate free hydrogen * H, Cu atoms near Ni (OH) 2 accelerate conversion from NO2 <-> to ammonia NH3, and the efficient series catalytic process is achieved. Under the condition of-0.1 V vs. Reversible hydrogen electrode RHE in a 1M potassium hydroxide solution containing 50 mM of potassium nitrate, the NH3 yield of 4.01 mgh <-1 > cm <-2 > and the NH3 Faraday efficiency of 97.3% are obtained, under the condition of 0V vs. RHE, the excellent energy efficiency of 46.5% is achieved, the excellent catalytic activity is kept in a NO3 <-> solution with the wide concentration, and the good sewage treatment capacity is achieved. The invention provides a new design thought for tandem catalysis, and has a wide application prospect in the field of NO3-RR.

The invention discloses an element liquid fertilizer for promoting nutrient absorption and a preparation method thereof, and belongs to the technical field of fertilizers. Comprising monoammonium phosphate; urea; potassium nitrate; cake fertilizer leach liquor; trace elements; a wetting agent; a stabilizer; a biological agent; an adsorbent; deionized water; the preparation method of the adsorbent comprises the following steps: A1, taking loofah sponge powder, and removing lignin and hemicellulose to obtain loofah sponge cellulose powder; a2, mixing the loofah sponge cellulose powder, deionized water, a chitosan solution and plant ash, mechanically pulping uniformly, performing vacuum freeze-drying treatment to form holes, crushing and grinding to obtain the adsorbent, root development can be promoted, elongation and thickening of stems are promoted, the photosynthetic rate of plants is increased, and the crop yield is increased.

The invention relates to the technical field of nitrate production, in particular to a potassium nitrate purification device which comprises a dissolving tank, a filtering device, a crystallization kettle, a centrifugal machine and a drying machine with a steam jacket which are sequentially connected in series through pipelines. The dissolving tank first jacket is connected with a heat source through a circulating pipeline; a liquid outlet of the centrifugal machine is sequentially connected with the cyclone separator, the ceramic membrane filter, the cationic resin column, the first temporary storage tank and the heat source, and the first heat exchanger and the second heat exchanger are sequentially installed between the first temporary storage tank and a heating medium inlet of the heat source. A steam outlet pipeline of the steam jacket is connected with a heat medium inlet of the first heat exchanger, the first heat exchanger is connected with the second temporary storage tank through a pipeline, and the second temporary storage tank is connected with the heat source through a pipeline. A pipeline of the second vacuum unit is connected with a thermal medium inlet of a second heat exchanger, and the second heat exchanger is connected with a second temporary storage tank. According to the method, the potassium nitrate purification efficiency, the product purity, the resource utilization rate and the energy economy are synergistically improved.

The invention discloses a preparation method of a demulsifier for oil-water separation of full fermentation broth, and relates to the technical field of demulsifier preparation.The preparation method comprises the steps of magnetic nanoparticle preparation, nanoparticle coating and demulsifier preparation.The preparation method has the advantages that salt is dissolved in a three-neck flask, nitrogen is introduced to discharge oxygen in the solution, and the demulsifier is obtained; according to the preparation method, the magnetic nanoparticles are added into the mixture A, so that the generated nanoparticles can be prevented from being oxidized, the mixture A is added in the process of adding the potassium nitrate and the 2-methylimidazole, and the polydopamine in the mixture A has good adhesion and biocompatibility, so that a'bridge '-like connection effect can be achieved between the magnetic nanoparticles and a subsequently generated nanoparticle coated sample; and polyvinylpyrrolidone can be used as a dispersant to prevent agglomeration of generated nano particle coated sample particles, and polar groups on molecular chains of polyvinylpyrrolidone can generate certain interaction with raw materials in a reaction system to optimize the growth process of the nano particle coated sample.

The invention relates to the technical field of polishing compositions, in particular to a silicon carbide wafer polishing solution and a preparation method thereof. The problems that a traditional polishing solution is low in silicon carbide wafer surface material removal efficiency, and the surface quality of the silicon carbide wafer obtained after polishing is high in attenuation are solved. In the preparation process of the silicon oxide suspension, the purity and dispersity of the silicon oxide microspheres are improved by controlling the quality of reactants and reaction conditions; the preparation method comprises the following steps: modifying 3-aminopropyltriethoxysilane, and carrying out ultrasonic treatment to obtain a silicon oxide dispersion liquid with good dispersibility; the ceric ammonium nitrate solution and the silicon oxide dispersion liquid are compounded to obtain a core-shell structure abrasive material; the core-shell structure abrasive provides efficient mechanical grinding capacity, the electrochemical mechanical polishing solution softens and oxidizes the surface of silicon carbide through the complexing effect of citric acid and the oxidation effect of potassium nitrate, the silicon carbide wafer polishing solution generated through the synergistic effect of citric acid and potassium nitrate has high removal efficiency on silicon carbide wafers, and the surface quality of the silicon carbide wafers is stabilized.

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention belongs to the technical field of biochar, and provides nitrogen-doped graded porous biochar as well as a preparation method and application thereof. The preparation method comprises the following steps: performing hydrothermal reaction on coconut shell biomass powder and urea to obtain nitrogen-doped biomass powder, and mixing the nitrogen-doped biomass powder with an activating agent for carbonization; the activating agent comprises potassium hydroxide and potassium nitrate. The agricultural waste coconut shells are prepared into the porous biochar, the raw material sources are wide, the production cost is low, the porous biochar is environmentally friendly, and the preparation method has the advantage of being high in yield which is 2.85 times that of a traditional alkali activation method; the nitrogen-doped graded porous biochar has the characteristics of excellent graded porous structure, strong chemical stability, high nitrogen content and high specific surface area, the adsorption capacity of gaseous iodine is effectively improved, the adsorption capacity of 6000 mg / g or above can still be kept after five times of adsorption, and the nitrogen-doped graded porous biochar has relatively good iodine retention capacity.

The present invention relates to a high-salt wastewater resource utilization technology, particularly to the resource utilization of potassium nitrate mother liquor, and specifically to a method for recycling potassium resources in the potassium nitrate mother liquor. The method comprises brine adjustment, first-stage cooling, second-stage cooling, solid-liquid separation, decomposition and washing, and evaporation and concentration. A decomposition liquid produced by the decomposition and washing is mixed with a concentrated liquid produced by evaporation and concentration to adjust the MgCl2 content in the system. The brine-adjusted system is cooled in two stages, followed by solid-liquid separation to obtain a crystalline solid and a crystalline mother liquor. The crystalline solid is added to the potassium nitrate mother liquor and stirred thoroughly, followed by solid-liquid separation to obtain potassium chloride solid and a decomposition liquid. The potassium chloride solid is reused as a production raw material. The crystalline mother liquor is evaporated and concentrated, and a portion of the concentrated liquid and the decomposition liquid are recycled by mixing brine. The remaining concentrated liquid is cooled to room temperature to obtain MgCl2·6H2O solid. The present invention recycles potassium chloride in the by-product mother liquor without adding additional steam and water.

The invention discloses a nano phase change heat storage material with high decomposition temperature as well as a preparation method and application thereof, and belongs to the technical field of mixed molten salt energy storage materials. The nanometer phase change heat storage material is composed of 99 wt% of low-melting-point mixed molten salt and 1 wt% of SiO2 nanometer particles. The low-melting-point mixed molten salt is composed of potassium nitrate, sodium nitrite and sodium nitrate according to the mass ratio of 53: (10-30): (17-37). The low-melting-point and high-decomposition-temperature nanometer phase change heat storage material with the melting point being 150-175 DEG C and the decomposition temperature being 660-723 DEG C is prepared by combining the mixed molten salt composed of potassium nitrate, sodium nitrite and sodium nitrate according to the specific dosage ratio with SiO2 nanoparticles, the melting point of the phase change material is low, energy consumption can be effectively reduced, and the energy consumption is reduced. And the composition has good decomposition temperature, melting latent heat and other thermophysical properties.

The invention provides a method for removing nitrate in water by using a modified zero-valent iron aerogel electrocatalyst, which comprises the following steps: preparing a mixed solution of ferrous sulfate and sodium sulfide, preparing a sodium borohydride solution, mixing and magnetically stirring the mixed solution and the sodium borohydride solution to obtain black colloid, and finally obtaining vulcanized zero-valent iron aerogel, dispersing the obtained sulfurized zero-valent iron aerogel and a Nafion solution in absolute ethyl alcohol to prepare a catalyst mixed solution; potassium nitrate and potassium hydroxide are dissolved in a pure water solution to serve as electrolyte, a sulfurized zero-valent iron aerogel electrode is used as a cathode, a platinum sheet is used as an anode, a mercuric oxide electrode is used as a reference electrode, and an electrocatalytic reduction reaction is carried out by using a three-electrode system. The technology not only can improve the efficiency of water nitrate pollution treatment, but also conforms to the concept of green and low-carbon development, and has a wide environment application prospect.

The invention is applicable to the technical field of potassium nitrate preparation, and particularly relates to a potassium nitrate preparation method which comprises the following steps: acquiring application information of potassium nitrate; obtaining raw material information according to the application information; obtaining reaction information according to the application information; and processing according to the raw material information and the reaction information to obtain preparation information. According to the potassium nitrate preparation method provided by the invention, the problem of low preparation efficiency caused by the possibility of increasing human errors due to manual operation in the traditional potassium nitrate preparation process can be solved.

The invention discloses a biochar-reinforced hydrogel slow-release fertilizer and a preparation method thereof, and relates to the technical field of fertilizers. Comprising the following steps: S1, preparing sorghum straw biochar; s2, adding the sorghum straw biochar and a potassium nitrate and ammonium dihydrogen phosphate solution into a polymer monomer mixed solution to obtain a biochar gel mixed solution; s3, adding the genipin solution into the biochar gel mixed solution, stirring, performing ultrasonic treatment, freezing and unfreezing to obtain the biochar reinforced hydrogel slow-release fertilizer. Aiming at the technical defects of the hydrogel slow-release fertilizer, the performance of the hydrogel slow-release fertilizer is modified and enhanced by utilizing the biochar, and the biochar-enhanced hydrogel slow-release fertilizer is formed. The preparation method is simple in process and convenient to operate, the raw materials are cheap and easy to obtain, the cost is low, and the prepared biochar reinforced hydrogel slow-release fertilizer has the advantages of good slow-release performance, high water retention capacity and environmental stability, and is of great significance in popularization and application of the hydrogel slow-release fertilizer.

The invention provides treatment equipment for ethanol and water mixed mother liquor and a sodium nitrate and potassium nitrate purification method, and relates to the technical field of waste liquid treatment, the treatment equipment comprises a flocculation box, a flocculation frame and a driving mechanism; a mounting plate is mounted at the top of the flocculation frame through bolts, the driving mechanism comprises a mounting frame mounted on the upper surface of the mounting plate, and a top plate and a bottom plate are fixedly arranged on the inner wall of the mounting frame. According to the scheme, in the overflowing and liquid discharging process, the water body in the flocculation box can be changed, flocculation groups with small sizes can turn over upwards, and the inclined plate with large initial inclination can block and capture the flocculation groups which turn over upwards, so that the flocculation groups are prevented from overflowing along with water flow through the inclined plate; meanwhile, the linkage plate can be adopted to control the multiple inclined plates to synchronously turn over in a linkage mode to change the inclination, flocculation groups captured on the inclined plates are shaken to be precipitated downwards, and it is guaranteed that overflowing and liquid discharging can be fast, so that waste liquid can be well flocculated, efficient and stable flocculation is guaranteed, and follow-up discharging or recycling is facilitated.

The invention discloses a biomass charcoal-based composite saline-alkali soil modifier which is obtained by mixing biomass charcoal and a glomalin extracting solution, oscillating, drying in the shade, and fully and uniformly mixing with monopotassium phosphate, potassium nitrate, potassium humate, algal polysaccharides and starch modified bentonite according to a formula. According to the modifier disclosed by the invention, after the glomalin is loaded on the biomass charcoal, under the supporting action of a carbon skeleton, the glomalin is used as an organic cementing substance for expanding a space, so that the soil agglomeration process is accelerated, the proportion of large aggregates is remarkably increased, and meanwhile, a positive promoting effect on the growth of a soil root system is achieved; the soil structure of a plough layer is improved, saline-alkali obstacles are reduced, and particularly the corn yield increasing effect is remarkable. In addition, the glomalin is loaded on the biomass charcoal, so that the degradation or loss of the glomalin is reduced, the glomalin can be slowly released and synergized under the action of microorganisms, and the application efficiency of the glomalin is improved.

The present invention discloses a high-purity photochlorination synthesis method of p-fluorobenzoyl chloride, wherein an aromatic nitro compound or its salt is selected to form an inhibition system with triethanolamine, which not only inhibits side reactions, but also inhibits the photochlorination process to inhibit fluorotoluene, the self-luminous defluorination of p-fluorotrichlorobenzyl, and the high-temperature defluorination of p-fluorobenzoyl chloride in the distillation process, thereby further improving the purity of the synthesized p-fluorobenzoyl chloride to above 99.5. The aromatic nitro compound or its salt is specifically any one or two of nitrobenzene, dinitrobenzene, nitrotoluene, sodium nitrite or potassium nitrite, preferably potassium nitrite; the dosage is 0.1‰ to 1‰ of the mass of p-fluorotoluene, and the addition amount and time are strictly controlled to ensure that the effect of inhibiting the defluorination is achieved while ensuring the safety of the reaction process and the product, and has good practical value and important economic value.

The invention discloses an electrolyte, a lithium battery and electric equipment. The electrolyte comprises a solvent, a lithium salt and an additive, the additive comprises crown ether, alkali metal nitrate and cyclic lactone, and the alkali metal nitrate comprises at least one of potassium nitrate, rubidium nitrate and cesium nitrate. The electrolyte can form an SEI film with an inorganic-polymer composite structure on the surface of lithium metal, and the inorganic SEI film layer improves the uniformity of lithium ion transmission and inhibits the generation of lithium dendrites; the toughness of the SEI film is improved by the polymer part, and the damage of volume change to the integrity of the SEI film is reduced. Meanwhile, according to the scheme, the fast charging capacity of the electrolyte can be improved, and high-rate charging and discharging of the lithium metal battery can be achieved. Therefore, the electrolyte can stably act for a long time, and can tolerate the volume change of lithium metal.

The invention provides a foliage dressing method for promoting quality improvement and fruit cracking prevention of early cultivation of sweet cherries, and belongs to the technical field of sweet cherry planting management. Comprising the following steps: after autumn, ditching around sweet cherry trees and applying an organic fertilizer; a high-nitrogen macroelement water-soluble fertilizer is applied along with drip irrigation before and after germination; after flowers fall, in a young fruit period and in a fruit core hardening period, flushing calcium ammonium nitrate for 2-3 times; after flowers of the sweet cherries fall, foliar fertilizer is sprayed five times; applying potassium nitrate when the fruits turn from green to white; potassium sulfate is applied in the fruit changing from white to red; after the fruits are harvested, the balanced macroelement water-soluble fertilizer is applied by flushing for 1-2 times. According to the invention, a leaf fertilizer is set as an organic liquid chelated calcium fertilizer, a brand-new chelating technology and an acidification adsorption technology are combined, an organic chelating agent is taken as a carrier, and organic liquid chelated calcium prepared by an advanced process is adopted, so that fruits can rapidly absorb the organic liquid chelated calcium and can rapidly transfer the organic liquid chelated calcium in a plant body, and calcium contained in a part needing calcium is efficiently absorbed and utilized; the sugar can be effectively stored in fruit organs of plants.

The invention relates to the technical field of photovoltaic glass, and discloses a composition for photovoltaic glass, the photovoltaic glass and a preparation method and application of the photovoltaic glass. Based on the total weight of the composition, the composition is prepared from the following components in percentage by weight: 65 to 75 percent of SiO2, 0.5 to 0.9 percent of Al2O3, 13 to 15 percent of Na2O, 0.02 to 0.2 percent of K2O, 9 to 12 percent of CaO, 2 to 5 percent of MgO and 0.2 to 0.9 percent of compound clarifying agent, the composite clarifying agent is a combination of potassium bifluoride, potassium nitrate, sodium pyroantimonate, sodium sulfate and carbon powder. The photovoltaic glass prepared from the composition provided by the invention has better clarification effect, light transmittance and lower melting temperature, and can reduce energy consumption and improve production efficiency.

The invention relates to the technical field of compound fertilizers, and discloses a root-promoting stress-resistant corn special fertilizer and a preparation method thereof, the root-promoting stress-resistant corn special fertilizer comprises an organic compound matrix, 8-15 parts of sodium alginate, 3-10 parts of bacillus subtilis, 3-7 parts of chelated zinc, 8-15 parts of potassium fulvate, 5-10 parts of polyaspartic acid, 17-25 parts of potassium nitrate, 12-20 parts of ammonium sulfate, 10-20 parts of bentonite and 25-35 parts of monoammonium phosphate, through the synergistic effect of various components in the fertilizer, efficient promotion of corn growth is realized, nitrogen provided by monoammonium phosphate promotes corn leaf growth and enhances photosynthesis, and phosphorus mainly promotes root development, so that the root is more developed, and the absorption capacity of the root to moisture and nutrients is improved; meanwhile, the resistance of the corn to adverse situations such as drought and cold is enhanced.

The invention provides a water-soluble fertilizer containing rare earth and a preparation method thereof. The water-soluble fertilizer is prepared from the following raw materials in parts by weight: 30 to 40 parts of nitrogen phosphorus and potassium components, 10 to 15 parts of calcium magnesium components, 3 to 5 parts of mineral element components, 0.5 to 1.0 part of nickel cobalt selenium components, 10 to 15 parts of humic acid, 5 to 10 parts of sodium alginate, 5 to 10 parts of fish protein, 3 to 5 parts of pyroligneous liquor, 2 to 4 parts of chelating agents and 0.5 to 1.0 part of rare earth. Wherein the nitrogen-phosphorus-potassium component is prepared by mixing urea, monoammonium phosphate, diammonium phosphate and potassium nitrate according to the mass ratio of (2-3): (1-2): (1-2): (2-3), the anti-caking agent is prepared from starch phosphate, microcrystalline cellulose and nano clay according to the mass ratio of (2.0-4.0): (1.5-3.5): (1.0-2.0), and the chelating agent is prepared from ethylenediamine tetraacetic acid, erythritol, glycine, salicylic acid or derivatives thereof according to the mass ratio of (4-6): (2-3): (1-2): (0.1-0.6). The complex multi-element ligand system is formed by combined use of ethylenediamine tetraacetic acid, erythritol, glycine, salicylic acid or derivatives thereof. Through the synergistic effect of a multi-element ligand system, rare earth ions are more effectively stabilized, and more stable chelated rare earth is formed, so that the solubility of the chelated rare earth in water is improved.

The invention discloses a preparation method of a modified adsorption material, and belongs to the field of water treatment. The method comprises the following steps: selecting analytically pure hydrochloric acid with the mass fraction of 37%, preparing a 10% hydrochloric acid solution, adding activated carbon into the hydrochloric acid solution according to the mass-volume ratio of 1g: 10mL, and shaking until the hydrochloric acid is fully contacted and reacted with the activated carbon; after the reaction is finished, washing with a large amount of deionized water until the pH value is close to 7, and then putting the washed activated carbon into a drying oven to obtain activated carbon pretreated by hydrochloric acid; through hydrochloric acid pretreatment, etching and chambering, a pore structure is optimized, functional groups such as nitryl and the like are directionally introduced through potassium nitrate high-temperature activation, a chambering-functionalization synergistic effect is formed, the specific surface area of the activated carbon is increased, the mesopore proportion is increased, the nitrogen element content reaches 2.78%, the adsorption capacity of pollutants such as methylene blue is increased, meanwhile, the raw material cost is low, and the environment friendliness is good. The problems that existing activated carbon is insufficient in pore structure regulation and control, lack of functional groups, low in adsorption efficiency, degraded in regeneration performance and the like are effectively solved.

The invention discloses a method for synthesizing glycine by coupling oxalic acid with nitrate under the electro-catalysis of a molecular catalyst lead phthalocyanine, and belongs to the technical field of materials and electro-catalysis. The method comprises the following steps: uniformly mixing lead phthalocyanine, a dispersing agent and a binding agent to prepare catalyst slurry; loading the catalyst slurry on carbon paper to obtain carbon paper containing a catalyst; an H-type electrolytic tank is assembled, in the H-type electrolytic tank, an electrolyte of an anode chamber is a sulfuric acid solution, an electrolyte of a cathode chamber is a sulfuric acid solution containing oxalic acid and potassium nitrate, and the cathode chamber and the anode chamber are separated through an ion exchange membrane; a calomel electrode is inserted into the cathode chamber as a reference electrode, carbon paper containing a catalyst is used as a working electrode, a platinum sheet is inserted into the anode chamber as a counter electrode, and glycine is obtained through electrolysis. The glycine is prepared by using the lead phthalocyanine as the catalyst, so that the reaction efficiency can be effectively improved, the reaction energy consumption is reduced, and the production process is simplified.

The invention relates to an invar alloy mask plate plasma nanometer polishing and thinning system and method, the system comprises a water tank (2), the water tank (2) is filled with a polishing solution (3) and an invar alloy mask plate (4), and the depth of the invar alloy mask plate (4) in the water tank (2) is controlled through a lifting system controller (5) and a lifting device (6); the polishing solution (3) comprises main salt, auxiliary salt and water; the main salt comprises (conductive electrolyte for generating plasma) 1-2% of potassium citrate and 1-2% of potassium nitrate; the auxiliary salt comprises a buffering agent, a thickening agent, a protective agent and a brightening agent. Through the synergistic effect of a special polishing solution formula and an optimization process, efficient and uniform thinning and nanoscale polishing of the ultrathin invar alloy mask plate are achieved, the surface flatness and environmental protection property are improved while the natural color gloss of metal is guaranteed and edge burning and salt residue are avoided, and the high-precision use requirement of the mask plate is met.

The invention belongs to the technical field of noble metal catalyst preparation, and particularly relates to a preparation method of high-purity tetraammineplatinum nitrate. According to the method, potassium tetranitroplatinate is prepared from chloroplatinic acid and potassium nitrite, then potassium hexanitroplatinate is prepared, and finally platinum nitrate tetraammine is prepared, so that the method uses fewer types of raw materials, does not use expensive reagents, has fewer steps, is simple and convenient to operate, is easy to realize large-scale production, and is suitable for industrial production. The yield of the prepared platinum tetraamminenitrate is greater than or equal to 94.1%, the purity of the platinum tetraamminenitrate is greater than or equal to 99.3%, and the platinum content is greater than or equal to 41.9%.

The invention relates to the technical field of agricultural fertilizers, in particular to a slow / controlled-release fertilizer for saline-alkali soil and a preparation method of the slow / controlled-release fertilizer. The slow / controlled-release fertilizer sequentially comprises a core layer, an inner coating, a shell layer and an outer coating from inside to outside, the core layer comprises a functional aid, diammonium hydrogen phosphate, urea, isobutylidene diurea, potassium nitrate and biochar; a shell layer contains bagasse, a compound strain and fulvic acid; the coating material is an adhesive containing montmorillonite powder; the functional additive is loaded with an organic acid and polymethacrylamide network through modified diatomite, so that the synergistic effect of sodium ion adsorption, acid-base regulation and nutrient slow release is realized; through the multi-layer structure design and the component synergistic effect, it is guaranteed that the slow and controlled release fertilizer can improve the saline-alkali soil structure in a long-acting mode, accurately regulate nutrient release and improve the stress resistance of crops, and the slow and controlled release fertilizer is suitable for efficient utilization of saline-alkali soil.

The invention discloses a planting and baking process suitable for Yunyan 87 tobacco leaves. According to the planting technology, basic fertilizer is applied through compound fertilizer, organic fertilizer and sesame cake fertilizer in one-time furrows, potash nitrate fertilizer, compound fertilizer and potash sulfate fertilizer are applied in stages, the soil structure is improved, the chemical component coordination of tobacco leaves is enhanced, synthesis and transportation of carbohydrates of the tobacco leaves can be promoted by last topdressing 60-65 days after transplanting, and the yield of the tobacco leaves is increased. According to the tobacco leaf baking process, the sugar content and quality of tobacco leaves are improved, meanwhile, the combustibility of the tobacco leaves is enhanced, a good foundation is laid for follow-up baking, the chemical components, the combustibility and the appearance quality of the tobacco leaves prepared through the tobacco leaf baking process are obviously improved, and the tobacco leaves at different parts are improved.

The invention relates to a sodium-sulfur battery technology, and aims to provide a preparation method and application of a modified carbon-supported sulfur electrode material and a self-supporting sulfur electrode. The preparation method comprises the following steps: carrying out spray drying on a mixed solution containing aniline hydrochloric acid, ammonium persulfate hydrochloric acid and nano calcium carbonate to obtain a precursor, and carrying out carbonization and acid leaching to obtain a hydrophilic carbon carrier with primary and secondary pore channels; a positive plate is prepared to assemble a soft package battery, and potassium intercalation is realized through multiple times of potassium deintercalation and intercalation cycle treatment; disassembling and cleaning to obtain a potassium-embedded carbon carrier, reacting with transition metal nitrate, and forming monatomic transition metal clusters between graphite layers to enlarge the graphite spacing; removing potassium nitrate to obtain a modified carbon carrier which is provided with three-stage mass transfer channels and in which transition metal is loaded, then grinding and mixing the modified carbon carrier with elemental sulfur, performing heating treatment, and cooling to obtain the modified carbon sulfur-loaded electrode material. According to the invention, transition metal single atomic clusters are formed on the walls of the micropores while the interlamellar spacing of the graphite is enlarged to form the micropores, so that the cycling stability of the sodium-sulfur battery is effectively improved.