413 results about "Potassium nitrate" patented technology

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 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 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 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 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 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 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.

The invention provides an ion exchange device for producing potassium nitrate, which comprises a frame body, an upper seal head, a lower seal head and a tank body, an ion exchange medium is arranged in the tank body and is used for producing potassium nitrate through ion exchange, and the frame body is provided with an accommodating space for supporting the tank body; the tank body is a vertical tank, the upper portion and the lower portion of the tank body are provided with an upper sealing head and a lower sealing head respectively, the upper sealing head is provided with a first feeding port and a first discharging port, the lower sealing head is provided with a second feeding port and a second discharging port, the side face of the tank body is provided with an overflow port, the overflow port is additionally provided with a T-shaped wire winding pipe, a lining pipe is additionally arranged in the T-shaped wire winding pipe, and through holes are distributed in the circumferential direction of the lining pipe. And the flow area of the through hole is 2.5-4.5 times of the flow area of the overflow pipe. The T-shaped wire winding pipe is additionally arranged through the overflow port, the structure of the T-shaped wire winding pipe is improved, the lining pipe is additionally arranged in the wire winding pipe, the through hole is formed in the wire winding pipe, and compared with the mode that only the T-shaped wire winding pipe is additionally arranged, the technical effect that the resin loss is reduced while it is guaranteed that liquid is discharged thoroughly can be achieved.

The invention relates to a method for simultaneously detecting fluorine and chlorine contents in lead concentrate by an ion selective electrode method, and belongs to the technical field of new material detection, and the method specifically comprises the following steps: (1) preparing a sample into a to-be-detected solution; (2) preparing a fluorine ion electrode standard solution and a chloride ion electrode standard solution; (3) calibrating a fluorine ion standard solution and a chloride ion standard solution; and (4) sample determination and data processing. According to the combined measurement method provided by the invention, through a layered coverage method, optimization of the ratio of potassium hydroxide to potassium nitrate and gradient temperature rise, on the premise of ensuring data quality, an accurate result is conveniently obtained; compared with a fluorine or chlorine testing method commonly used in the market, the method is short in time consumption, simple in equipment and accurate in data; in addition, the combined detection method provided by the invention breaks through the pH limit of traditional single ion detection, and provides a reliable solution for synchronous determination of fluorine and chlorine in a complex matrix sample.

The application discloses a preparation method and application of a zirconium dioxide loaded iridium oxide nanocluster oxygen evolution electrocatalyst. A mixed solution of zirconium salt, amide solvent and organic acid is prepared, and the mixed solution is kept at 120 DEG C for 24 hours; after cooling, the white product is separated, washed and dried. Then, the product and iridium salt are dispersed in a mixed solution of tetrahydrofuran and water, and sodium nitrate and potassium nitrate aqueous solution are added under stirring; after stirring, rotary evaporation is carried out at 60 DEG C, and the greenish powder obtained after drying is vacuum dried at 60 DEG C for 12 hours; the greenish powder is kept in a muffle furnace at 450 DEG C for 30 minutes, and then cooled in air; the greenish powder is washed with deionized water and anhydrous ethanol for multiple times, and finally vacuum dried at 60 DEG C for 12 hours. The zirconium dioxide loaded iridium oxide material based on oxygen overflow stable tetragonal zirconia can be specially applied to an electrocatalyst for an oxygen evolution reaction in an acidic electrolyte, has excellent oxygen evolution reaction activity, follows a lattice oxygen mechanism in the reaction process, and can realize an oxygen overflow effect from tetragonal zirconia to iridium oxide nanoclusters to stabilize the catalyst.

The invention discloses a low-energy-consumption crystallization purification method of high-purity molten salt-grade potassium nitrate, and belongs to the technical field of purification of inorganic chemical materials. The method comprises the steps of raw material pretreatment directional impurity removal, multi-stage gradient crystallization, mother liquor graded circulation and low-temperature drying, in the raw material pretreatment stage, impurity concentration online detection and dynamic pH regulation are combined, a chelating agent, an oxidizing agent and an adsorption flocculant are added step by step, precise directional removal of metal impurities and suspended solids is achieved, and the product purity is improved; a multi-stage gradient crystallization process combining gradient temperature control and sectional controllable cooling is adopted, and the crystallization efficiency is improved in cooperation with a crystal form regulating agent; a mother liquor graded circulation and drying waste heat recovery system is matched, so that the mother liquor utilization rate is increased, and the production energy consumption is reduced.

The application provides a method for promoting mist culture rooting of Pinus squamaeformis, and relates to the technical field of Pinus squamaeformis cutting propagation. The method for promoting mist culture rooting of Pinus squamaeformis comprises the following steps: soaking Pinus squamaeformis cuttings in a citric acid solution in an ice water bath, disinfecting the cuttings, and treating the cuttings with a rooting agent; and then performing mist culture on the cuttings by adding a nutrient agent containing calcium nitrate, potassium nitrate, magnesium sulfate, copper sulfate, indole butyric acid, sodium phytate and lauryl alcohol polyether-4. The method overcomes the shortcomings of the prior art, effectively promotes rapid rooting of Pinus squamaeformis branches, guarantees the growth of root systems, provides a fast and convenient method for stable seedling raising of Pinus squamaeformis, and guarantees artificial breeding of Pinus squamaeformis.

The application provides a kind of core-shell structure quaternary energetic material and its preparation method and application, wherein the preparation method comprises the following specific steps: S1: nano magnesium powder and potassium nitrate powder are dissolved in organic solvent in turn, and Mg / KNO3 energetic slurry is obtained by heating and stirring;S2: nano aluminum powder and PTFE powder are treated by ultrasonic to obtain metastable mixed powder, then the metastable mixed powder is added to the prepared polymer binder, and Al / PTFE metastable composite slurry is obtained by heating, stirring and evaporation treatment;S3: the Mg / KNO3 energetic slurry obtained in S1 and the Al / PTFE metastable composite slurry obtained in S2 are added to two different barrels of 3D printer respectively, the equipment parameters of 3D printer are adjusted, and the Al / PTFE / Mg / KNO3 quaternary energetic material with core-shell structure is processed.The quaternary energetic material of the application can reduce the ignition temperature of the existing composite system material, further reduce the carbon residue formed after combustion, and the processing technology is simple, which can meet the personalized forming demand.

The invention discloses a nutrition regulating agent for regulating the mature period of citrus fruits and application of the nutrition regulating agent. The nutrition regulating agent is prepared from potassium nitrate, monopotassium phosphate, magnesium sulfate, ferric sodium ethylenediaminetetraacetate, zinc sodium ethylenediaminetetraacetate, boric acid, ammonium molybdate, gibberellin, abscisic acid and diatomite which is supplemented to 100 parts. The invention further provides a preparation method of the nutrition regulating agent and application of the nutrition regulating agent in regulating the mature period of citrus fruits, and the application mode is that when the diameter of the citrus fruits is 40-50 mm, the preparation is diluted by 600-800 times to be sprayed on leaf surfaces, once every 7 days and twice continuously. Through the synergistic effect of mineral nutrient elements and low-concentration hormones, bidirectional precise regulation and control of the citrus mature period are achieved, fruits can be promoted to mature in advance or later for 7-15 days, the sugar-acid ratio and color of the fruits can be remarkably improved, meanwhile, the problems of tree vigor decline and quality decline caused by single hormone treatment are solved, and the method is suitable for large-scale popularization and application. The method has the characteristics of high efficiency, safety and simple operation.

The invention relates to the technical field of zinc hydrometallurgy, and discloses an analysis method for measuring high cobalt content by an EDTA complexing back titration method, which is based on the following steps: oxidizing Co < 2 + > into Co < 3 + > by using potassium nitrite in an acetic acid medium to form cobalt potassium nitrite precipitate so as to realize separation of cobalt and interfering ions, dissolving the precipitate, complexing with excessive EDTA, and performing back titration by using a zinc standard solution. Xylenol orange is used as an indicator, and determination is completed at room temperature in a hexamethylenetetramine buffer system with the pH value being approximately equal to 5.8. Coexisting ion interference is effectively eliminated through tartaric acid, sodium fluoride, thiourea and other masking agents, the method has the advantages of being easy and convenient to operate, sensitive in end point, high in accuracy and low in cost, and the requirement for conventional analysis of high-cobalt materials can be met.

The utility model relates to a potassium nitrate crystallization device and belongs to the technical field of potassium nitrate production and processing. The device mainly comprises a tank body, a stirring assembly, a heat exchange tube group, an anti-scaling wall-scraping mechanism and a discharging assembly, a conical flow guide part is arranged at the bottom of the tank body; the heat exchange efficiency of the heat exchange tube group is enhanced through fins; the anti-scaling wall scraping mechanism removes crystals through a scraping plate; the stirring assembly optimizes liquid flowing;

The invention discloses an areca-nut solid fertilizer for improving the content of catechin and precise nutrition of areca-nuts and application of the areca-nut solid fertilizer, and belongs to the technical field of fertilizer preparation. The preparation method comprises the following steps: mixing cassava straws, cassava residues, hermetia illucens sand, calcium superphosphate, quick lime and zymophyte, and carrying out first composting fermentation to obtain a first fermented product; and adding macroelements containing monopotassium phosphate, potassium nitrate, urea, calcium carbonate and magnesium sulfate in a specific proportion, microelements containing boron, zinc, copper, iron and manganese in a specific proportion and bacillus subtilis into the first fermented product, carrying out second composting fermentation, and carrying out aging treatment to obtain the betel nut solid fertilizer. The prepared betel nut solid fertilizer can accurately provide nutrients according to the requirements of betel nuts for various nutrient elements, and negative effects on soil due to excessive nutrient elements are avoided; meanwhile, the content of areca catechin is increased, and the nutritional value of the areca catechin is enhanced.

This invention belongs to the field of glass technology and relates to a high-temperature resistant structural glass material, its preparation method, and its applications. The glass is composed of the following components by mass percentage: 60%-70% silicon dioxide, 5.5%-11% boric acid, 0.1%-5% aluminum hydroxide, 0%-3% potassium nitrate, 5.5%-13% potassium carbonate, 0%-12% sodium carbonate, 0.1%-4% calcium carbonate, 0%-2% calcium fluoride, 0%-1% lithium carbonate, 0%-2% basic magnesium carbonate, 0.1%-1% titanium dioxide, 0%-2% zirconium dioxide, and 0%-1% cerium dioxide; the total mass percentage of potassium nitrate, potassium carbonate, sodium carbonate, and lithium carbonate does not exceed 22%. This structural glass possesses a high softening temperature, a suitable coefficient of thermal expansion, high-temperature resistance, thermal shock resistance, and processing performance, making it suitable as a structural material for optoelectronic devices.

The invention belongs to the technical field of water-soluble fertilizer preparation, and particularly relates to a water-soluble biochar base fertilizer, which is prepared from the following raw materials in parts by mass: 30 to 40 parts of composite modified biochar, 15 to 20 parts of urea, 10 to 20 parts of potassium nitrate, 10 to 15 parts of sodium borate, 2 to 5 parts of copper sulfate, 0.5 to 1 part of zinc sulfate and 0.5 to 1 part of microbial agent. The surface of the biochar contains more oxygen-containing functional groups due to the excellent porous adsorption structure of the biochar, so that soil adsorbs a large number of positive ions, the cell biological permeability is improved, the photosynthesis of plants is enhanced, the nutrient and moisture absorption capacity of plant root systems is enhanced, and the yield and income of food crops and commercial crops are increased by matching with other nutritional ingredients.

This invention relates to the field of fertilizer technology, specifically to an organic liquid fertilizer based on straw enzymatic hydrolysate and its preparation method. The method includes: pretreating corn straw with potassium hydroxide, followed by enzymatic hydrolysis with cellulase and xylanase to obtain the enzymatic supernatant; sequentially treating the supernatant with an ultrafiltration membrane with a molecular weight cutoff of 3000 Da and a nanofiltration membrane with a molecular weight cutoff of 500 Da to collect oligosaccharides with a molecular weight window of 500-3000 Da; partially stabilizing the reducing end of the oligosaccharides with sodium borohydride; pre-complexing with boric acid at pH 8.4-8.8; then sequentially adding relatively low molecular weight sodium polyglutamate, calcium chloride dihydrate aqueous solution, and ultra-high molecular weight sodium polyglutamate to construct a sequential complexation system; subsequently adding potassium nitrate and citric acid aqueous solution; and finally, after filtration at 5 μm and heat treatment at 70℃, obtaining the organic liquid fertilizer. This fertilizer has a high proportion of 500-3000 Da oligosaccharides and a low reducing sugar equivalent, inhibiting storage precipitation and browning, and improving the retention rate of extractable oligosaccharides in the soil.

The invention relates to the technical field of food detection, in particular to a method for determining the iodine content in formula food for special medical purposes. The determination method comprises the following steps: (1) weighing potassium iodide, and adding water for dissolving to obtain a reference substance working solution; (2) adding water into a test sample to obtain a sample suspension, and performing alkali ashing treatment to obtain a sample solution; (3) adding a sulfuric acid solution and a reagent adopted for alkali ashing treatment into the reference substance working solution, and respectively performing derivatization treatment and organic solvent extraction on the reference substance working solution and the sample solution to obtain a reference substance solution and a test solution; (4) testing by adopting a gas chromatographic method, and calculating the iodine content; reagents adopted in the alkali ashing treatment are a potassium hydroxide solution, a potassium nitrate solution and a potassium permanganate solution (or manganese dioxide); the derivatization treatment comprises the steps of adding a sodium sulfite solution, standing, and adding a ketone reagent and a hydrogen peroxide solution to carry out a derivatization reaction. The method has the advantages of being low in cost, high in safety and high in accuracy.

The invention relates to the technical field of new energy and mining and blasting, in particular to a preparation method of a biomass instantaneous cracking agent. The preparation method comprises the following steps: mixing biomass powder, pulverized coal, an oxidant, a catalyst and a release agent to obtain mixed powder; mixing the adhesive, the water and the preservative to prepare a glue solution; the glue solution and the mixed powder are kneaded, granulated and dried, and the biomass instantaneous cracking agent is obtained, the biomass powder accounts for 4-55 parts by mass, the pulverized coal accounts for 0-48 parts by mass, the oxidizing agent accounts for 0-45 parts by mass, the catalyst accounts for 0-20 parts by mass, the release agent accounts for 0-2.5 parts by mass, the adhesive accounts for 2-10 parts by mass, the preservative accounts for 0-0.15 part by mass, and the oxidizing agent and the catalyst are not 0 at the same time; the oxidizing agent is potassium peraluminate powder and / or ammonium perchlorate powder; the catalyst is potassium nitrate powder and / or sodium nitrate powder. The biomass instantaneous cracking agent prepared by the invention solves the problems of long stone cracking time, low efficiency and environmental pollution of the existing stone cracking agent.