294 results about "Potassium oxide" patented technology

The invention belongs to the technical field of glass materials, and discloses thermal shock resistant transparent high borosilicate glass which comprises the following components in percentage by weight: 60-70% of silicon dioxide, 18-22% of diboron trioxide, 4-7% of aluminum oxide, 3-5% of magnesium oxide, 2-4% of alkali metal oxide, 0.5-1.5% of nano silicon nitride and 0.5-1% of nano aluminum titanate. The thermal shock temperature difference of the glass within the temperature change range of 20-200 DEG C is larger than or equal to 180 DEG C, the light transmittance within the visible light range of 400-760 nm is larger than or equal to 85%, the alkali metal oxide is composed of sodium oxide and potassium oxide, the weight ratio of the sodium oxide to the potassium oxide is 1: 1-3: 1, the average particle size of the nanometer silicon nitride is smaller than or equal to 100 nm, and the nanometer silicon nitride is evenly dispersed in the glass matrix; according to the thermal-shock-resistant transparent high borosilicate glass and the preparation method thereof, the thermal shock resistance and light transmittance of the glass are improved by optimizing the chemical components of the glass and adding the special nanoparticles in cooperation with a specific preparation process, and the thermal shock resistance of the glass is improved. The problems that existing high borosilicate glass is insufficient in thermal shock resistance and low in light transmittance in a high-temperature environment are solved.

The invention discloses high-strength high-temperature-resistant fireproof industrial glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The industrial glass is prepared from the following raw materials: silicon dioxide, boric oxide, aluminum oxide, sodium oxide, potassium oxide, niobium phosphate, a composite reinforcing component and a clarifying agent, the composite reinforcing component is prepared from hafnium oxide, gadolinium oxide and zinc oxide; the clarifying agent is obtained by mixing cerium dioxide and tin oxide. The preparation method of the industrial glass comprises the following steps: preparing functional components, melting glass, forming a glass substrate, and preparing the industrial glass. The prepared industrial glass is high in strength, good in high-temperature stability and excellent in fireproof performance.

The invention discloses a preparation process of carboxylated shell-based activated carbon for organic matter adsorption, and particularly relates to the technical field of adsorption materials, and the preparation process comprises the following steps: mixing coconut shell powder and walnut shell powder, crushing, and loading potassium hydroxide in stages in a gradient manner; carrying out two-stage microwave activation in an inert atmosphere, namely low-temperature pre-activation in the first stage and high-temperature activation in the second stage, and introducing carbon dioxide; the activated product, phosphoric acid, a laccase-peroxidase complex enzyme preparation and a buffer solution are subjected to ultrasonic synergistic modification, and then a weak acid reaction is maintained through dynamic pH regulation and control; and finally, performing graded washing and gradient drying to obtain a finished product. According to the method, high-density carboxyl grafting and graded pore construction are synchronously realized under mild conditions through a synergistic effect of directional catalysis of biological enzyme and dynamic regulation of microwave, so that the problems of structural damage caused by strong acid corrosion, pore imbalance caused by fixed parameters and stability reduction caused by insufficient post-treatment in a traditional process are solved; the adsorption performance and the regeneration cycle performance of the material are also obviously improved.

The invention relates to the technical field of catalysts, in particular to an iron-based catalyst for synthesizing low-carbon olefins and a preparation method and application thereof.The iron-based catalyst is prepared from, by mass, 50-80 parts of an active component, 5-20 parts of an auxiliary A and 2-10 parts of an auxiliary B. The active component is iron or iron oxide; the aid A is selected from at least one of transition metal manganese or manganese oxide, copper or copper oxide and zinc or zinc oxide, and the aid B is potassium or potassium oxide; the invention provides an iron-based catalyst for synthesizing low-carbon olefins, the average pore size of the iron-based catalyst is 2-20nm, in addition, the invention further provides a preparation method of the iron-based catalyst for synthesizing the low-carbon olefins and application of the iron-based catalyst for synthesizing the low-carbon olefins, and the iron-based catalyst for synthesizing the low-carbon olefins, the preparation method and the application have the advantages that the average pore size of the iron-based catalyst is 2-20nm; the problems that an iron-based catalyst is unreasonable in pore structure, wide in pore size distribution and low in catalyst activity and selectivity are solved.

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 invention relates to the field of nuclear power operation, in particular to a control method for quantitative ammonia potassium saturation of cation resin of a primary loop purification system of a nuclear power plant. The method comprises the following steps: before starting ammonia-potassium saturation, calculating the total amount of ammonia absorbed by resin, the total amount of potassium absorbed by resin and the ideal concentration of a potassium hydroxide solution by utilizing the total exchange amount of nuclear-grade cation resins in a series I and a series II and the ammonia and potassium selectivity coefficients of the nuclear-grade cation resins; the flow of the first series and the flow of the second series are adjusted, the theoretical ammonia adding amount of the first loop under different flows of the second series is calculated, and continuous ammonia adding is conducted on the first loop with the theoretical ammonia adding amount as the target; when the series of diamino potassium is saturated, sampling and analyzing the total alkali metal content and the ammonia content from the outlets of the primary loop and the series II, and calculating and adjusting the adding amount and the frequency of the potassium hydroxide solution to ensure that the total alkali metal concentration of the main loop is in the area A and does not deviate; after the potassium ammonia saturation of the series II is finished, stopping the operation of the series I, calculating the required ammonia adding amount under the normal working condition, timely adjusting the continuous ammonia adding amount of the loop I, quitting the series I, and keeping the operation of the series II. According to the invention, smooth implementation of saturation of series of diamino potassium and safety of primary loop water quality are ensured.

The invention discloses a magnesium alloy micro-arc oxidation electrolyte which comprises sodium metaaluminate, sodium hydroxide, sodium fluoroaluminate, aluminum fluoride and glycerol. The content of sodium metaaluminate is 5-25 g / L, the content of sodium hydroxide is 1-3 g / L, the content of sodium fluoroaluminate is 0.3-0.7 g / L, the content of aluminum fluoride is 0.2-0.3 g / L, and the content of glycerol is 1 g / L. The magnesium alloy micro-arc oxidation electrolyte comprises potassium metaaluminate, potassium hydroxide, potassium fluoroaluminate, aluminum fluoride and glycerol, the content of potassium metaaluminate is 10-20 g / L, the content of potassium hydroxide is 3-5 g / L, the content of potassium fluoroaluminate is 0.5-0.7 g / L, the content of aluminum fluoride is 0.3-0.5 g / L, and the content of glycerol is 1 g / L. The invention further discloses the magnesium alloy hard ceramic membrane and a preparation method thereof. According to the preparation method of the magnesium alloy hard ceramic film, the components and the microstructure of the magnesium alloy micro-arc oxidation film layer are changed, and meanwhile the hardness and the corrosion resistance of the magnesium alloy micro-arc oxidation film layer are improved.

This invention provides a micro-arc oxidation electrolyte for magnesium alloy surface treatment and a method for preparing a micro-arc oxidation film. The micro-arc oxidation electrolyte is an aqueous solution containing sodium silicate, sodium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles; or, an aqueous solution containing sodium silicate, potassium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles. This invention also discloses a method for preparing a micro-arc oxidation film using the aforementioned micro-arc oxidation electrolyte for magnesium alloy surface treatment. The micro-arc oxidation electrolyte of this invention contains conductive ceramic nanoparticles—titanium boron carbon nitride conductive nanoparticles. Using these nanoparticles to perform a micro-arc oxidation reaction on the magnesium alloy surface can improve the microstructure of the micro-arc oxidation film, while simultaneously enhancing the corrosion resistance and wear resistance of the magnesium alloy after micro-arc oxidation treatment, significantly improving the surface protection capability of the magnesium alloy, and extending its service life.

The invention relates to potassium superoxide composite particles as well as a dry-method preparation process and a preparation system thereof, and belongs to the technical field of superoxide. The composite particle comprises a core and a shell layer, the core is a mixture of potassium superoxide and bentonite, the shell layer is a calcium hydroxide wrapping layer wrapping the core, and the core and the shell layer form a core-shell structure; the process comprises the steps of dry powder mixing, dry granulation and size stabilization, microwave strengthening and surface wrapping. The system comprises a raw material pretreatment device, a dry powder mixing device, a dry rolling granulation device, a microwave strengthening treatment device and a surface wrapping device. A dry granulation process is adopted, the risk that potassium superoxide and water are subjected to violent reaction is fundamentally eliminated, bentonite is used as an inert matrix, the effects of diluting and stabilizing potassium superoxide are achieved, the sensitivity of potassium superoxide to external stimulation is reduced, and the particle product is excellent in comprehensive performance.

This invention relates to a gold-sand porcelain, comprising a ceramic body, characterized by further including a carved layer disposed on the surface of the ceramic body. The ceramic body comprises, by weight, the following components: 35-50 parts mineral clay, 25-35 parts hydromica, 2-6 parts kaolin, 10-20 parts quartz, 5-10 parts mica, 1-6 parts silicon dioxide, 2-5 parts iron oxide, 1-3 parts aluminum oxide, 2-6 parts calcium oxide, 2-5 parts magnesium oxide, 5-10 parts manganese oxide, 1-6 parts potassium oxide, 2-5 parts sodium oxide, and 2-6 parts zinc oxide. The carved layer is decorated according to a desired pattern. The gold-sand porcelain of this invention is characterized by being made of clay with a high gold content, being unglazed, having good breathability, good thermal shock resistance, preserving the original flavor of food, and optimizing and activating beneficial bacteria.

The invention discloses a method for reducing by-product N-methylaniline in RT base condensation liquid. According to the method, potassium hydroxide modified activated carbon is added in condensation reaction. The potassium hydroxide modified activated carbon greatly reduces the generation of a by-product N-methylaniline in a condensation reaction, reduces the absorption of carbon dioxide in air by system materials, slows down the increase of tetramethyl carbonate, prolongs the catalytic life of tetramethyl ammonium hydroxide, saves the cost of raw materials, and has a good application prospect.

The invention provides a method for reducing the diameter of a tungsten filament of tungsten filament screen cloth, which reduces the risk of injury to operators and is good in environmental friendliness. The size precision control of the tungsten filament reducing process is high; the corrosion degree of equipment is reduced, and the maintenance cost is reduced. The method is characterized in that a mixed solution containing potassium ferricyanide, potassium hydroxide and deionized water is adopted as an etching solution for reducing the tungsten filament, the mass percent of potassium ferricyanide in the etching solution is 5%-20%, and the mass percent of potassium hydroxide in the etching solution is 3%-10%.

Glass compositions include one or more of phosphorus oxide (P2O5), niobia (Nb2O5), titania (TiO2), potassium oxide (K2O) and lithium oxide (Li2O) as essential components and may optionally include barium oxide (BaO), zinc oxide (ZnO), V2O5 (vanadia), FeO (iron oxide) and other components.

The invention provides a process for purifying nickel from electrolytic waste for preparing nitrogen trifluoride, which comprises the following steps: after a nitrogen trifluoride electrolytic cell stops electrolysis, transferring the electrolytic waste into a first batching kettle, adding anhydrous hydrogen fluoride, dissolving ammonium bifluoride mixed in the electrolytic waste into a molten state, and adding a second batching kettle; then solid-liquid separation is achieved in a centrifugal mode, and the liquid part is molten liquid to be reused as electrolyte; ammonia water is added into a second batching kettle to adjust the pH value, solid-liquid separation is achieved in a centrifugal mode, the liquid part is transferred into an intermediate tank, potassium hydroxide is added to continue to adjust the pH value, nickel in the solution is precipitated out, ammonia escapes and is prepared into dilute ammonia water in a falling film absorption mode, and the dilute ammonia water can return to a system to be reused; the solid part directly enters a smelting furnace, the temperature is gradually increased until nickel is smelted into a liquid state, then cooling is conducted, and the nickel purity can reach 99% or above. According to the method, the nickel in the electrolytic waste mixed with the sediments in the nitrogen trifluoride electrolytic cell is purified, and appreciation is achieved.

The present application relates to a kind of porous silicon carbide, porous silicon carbide@G composite material and its preparation method and application, belong to the technical field of semiconductor materials.The preparation method of porous silicon carbide uses silicon carbide as anode, Pt is cathode, potassium hydroxide aqueous solution is electrolyte, control potassium hydroxide aqueous solution temperature, using two-step constant voltage constant current etching, while carrying out solution electrochemical corrosion on the surface of silicon carbide, carry out depth vapor assisted diffusion layer corrosion, obtain porous silicon carbide.The present application also obtains porous silicon carbide@G composite material by using porous silicon carbide as substrate, and in-situ graphitization is carried out on the surface of silicon carbide substrate.The present application uses potassium hydroxide to replace HF when preparing porous silicon carbide, and steam is used to improve the uniformity and etching efficiency of silicon carbide etching.The uniform mesoporous structure in the porous silicon carbide prepared after etching provides high specific surface area and optimized ion transmission path.

The invention discloses a space anti-radiation glass cover sheet and a preparation method thereof, the glass cover sheet comprises the following raw materials by mass: 50-70 parts of silica, 5-15 parts of sodium oxide, 5-10 parts of lithium oxide, 5-10 parts of diboron trioxide, 3-10 parts of lead oxide, 2-6 parts of cerium oxide, 0.5-6 parts of potassium oxide, and 2-5 parts of alumina. According to the invention, PbO and CeO2 are added into the preparation raw materials, so that the radiation resistance of the glass cover plate is enhanced.

This application provides an aramid slurry and its preparation method, a battery separator and its preparation method, and its application. The aramid slurry comprises aramid fibers, a non-protic strongly polar solvent, and a co-solvent. The co-solvent has a pH value of 5–7.5 at 25°C and 101.325 kPa; the rotational viscosity of the aramid slurry is 500 mPa·s–5000 mPa·s. The aramid slurry of this application eliminates the need for strong alkaline co-solvents such as sodium hydroxide or potassium hydroxide to dissolve the aramid, avoiding the damage to aramid molecules caused by such co-solvents, extending the operating time window, and improving the stability of the slurry. The slurry can be stably stored for more than 168 hours, reducing the difficulty of production operations and the investment in personnel and equipment, thus facilitating large-scale production. Furthermore, the rotational viscosity of the aramid slurry formed in this application has a suitable range; within this range, the slurry not only exhibits good stability but also provides ideal separator performance.

The invention relates to the technical field of chemical production concentration and purification, and discloses a potassium hydroxide concentration and refining process and device, the potassium hydroxide concentration and refining process comprises a shell, the shell is internally provided with a concentration assembly for concentrating a multi-stage clarified solution, and the top end of the shell is provided with a water inlet pipe communicated with an inner cavity space. According to the equipment, all parts in a concentration assembly are matched, and a gravity water supply principle is formed by utilizing the liquid level difference between a water inlet pipe and an overflow port, so that a solution sequentially flows through a first-stage middle cavity to realize primary slow flow sedimentation, secondary slow flow collection under the guidance of a water guide conical barrel and spiral slow flow separation of an inner conical barrel and a spiral strip sheet; finally, multi-stage clarification and refining of the solution are completed, the purpose of removing impurities with different particle sizes in the solution is achieved, the impurities with different particle sizes can be separated in a targeted mode through cooperation of stage slow flow and gravity settling, the refining purity of the potassium hydroxide solution is remarkably improved, and the problem that impurities are not thoroughly removed due to a single clarification structure is solved.

This application discloses a method for producing acetonitrile by amination of acetate, comprising the following steps: in a reactor, acetate, ammonia, and a catalyst are contacted and reacted to obtain acetonitrile; wherein the acetate is selected from at least one of methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and cyclohexyl acetate; the catalyst is composed of a support and alkaline earth metal oxides and alkali metal oxides supported on the surface of the support; wherein the support is selected from at least one of silicon oxide, aluminum oxide, titanium oxide, and zirconium oxide; wherein the alkaline earth metal oxide is selected from at least one of magnesium oxide, calcium oxide, strontium oxide, and barium oxide; wherein the alkali metal oxide is selected from at least one of lithium oxide, sodium oxide, and potassium oxide; wherein the loading of alkaline earth metal oxide in the catalyst is 0.01–10 wt%, the loading of alkali metal oxide is 0.05–5 wt%, and the remainder is the support.

The invention relates to the technical field of ceramics, in particular to glazed foamed ceramic and bubble art glaze thereof. The oxide is prepared from the following chemical components in percentage by mass: 56 + / -2% of silicon dioxide, 9.0 + / -0.5% of aluminum oxide, 8.0 + / -1% of calcium oxide, 3.5 + / -1% of magnesium oxide, 5.5 + / -1% of zinc oxide, 12.0 + / -1% of potassium oxide, 3.5 + / -1% of sodium oxide, 2.5 + / -0.5% of diboron trioxide and 0-1.5% of colored metal oxide. The foaming agent raw materials comprise high-temperature decomposition type carbonate and high-temperature reaction type silicon carbide or silicon-oxygen-carbon. The glaze surface is devitrified, opacifying and matte, the carbonate foaming agent is completely decomposed and escaped on the glaze surface in the early stage to form a rough and uneven effect, silicon carbide or silicon-oxygen-carbon reacts in an oxidizing atmosphere at 1025 + / -25 DEG C to generate foaming gas, the foaming gas is matched with a boron element, and the temperature is rapidly increased to the highest firing temperature to promote glaze bubbles to break through the glaze surface to form open bubbles.

The invention discloses an alkaline diatomite functional water-soluble fertilizer and a preparation method thereof, and belongs to the technical field of agricultural fertilizers. The preparation method comprises the following steps: pickling diatomite with hydrochloric acid to remove impurities, and carrying out alkaline hydrolysis activation with potassium hydroxide to obtain a high-activity potassium silicate solution; then, urea, monopotassium phosphate, potassium sulfate and other nutrient sources are added, a citric acid-borax buffer system is introduced to adjust the pH value, and finally the liquid water-soluble fertilizer is obtained. The effective silicon content in the fertilizer is greater than or equal to 100g / L, the total amount of the urea, the monopotassium phosphate and the potassium sulfate is greater than or equal to 140g / L, and the pH value (dilution at 1: 250) is 10.0-11.5. The problems that a traditional silicon fertilizer is poor in water solubility and prone to gelation are solved, and the product can be used for drip irrigation or foliage spraying and has the remarkable effects of improving acidified soil, promoting crop growth and increasing yield and quality.

The application provides a method for preparing offretite by using natural analcime as a raw material, the offretite and application thereof, and relates to the technical field of zeolite materials. The natural analcime is mixed with an aqueous solution of an ammonium salt to perform ion exchange, so that ammonium-type analcime is obtained; the ammonium-type analcime is calcined to obtain hydrogen-type analcime; and the hydrogen-type analcime is mixed with sodium hydroxide, potassium hydroxide and water to perform hydrothermal reaction, so that the offretite is obtained. The natural analcime is a kind of zeolite mineral widely existing in nature, and the application uses the natural analcime as a raw material, so that the application has the remarkable advantages of low price and environmental friendliness; and the traditional hydrothermal method needs 7-10 days to synthesize offretite with high crystallinity, while the application uses the natural analcime as a raw material to perform crystal transformation synthesis of offretite, so that offretite with high crystallinity can be obtained in 0.5-2 days. Moreover, the offretite provided by the application can efficiently adsorb heavy metal ions in wastewater.

The invention discloses a texturing process of a single crystal battery piece. The texturing process comprises the following steps: S1, performing pre-texturing treatment on a silicon wafer by adopting pre-texturing liquid; s2, texturing the silicon wafer by adopting texturing liquid; the prefabricated down liquid comprises polyvinylpyrrolidone and polyvinyl alcohol; the texturing liquid comprises inorganic alkali, a defoaming agent and a catalyst; the inorganic base is selected from at least one of sodium hydroxide and potassium hydroxide, and the defoaming agent is selected from at least one of dodecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride, diethylene glycol, triethylene glycol and tetraethylene glycol. The catalyst is selected from at least one of sodium 5-nitro-o-methoxyphenolate, sodium o-nitrophenolate and sodium p-nitrophenolate. A nucleating agent solution is adopted to carry out texturing pretreatment on a silicon wafer, then alkali treatment texturing is carried out on the silicon wafer, and the liquid changing period of the texturing process is long; and the cell pieces prepared by taking the polyvinylpyrrolidone and the polyvinyl alcohol as the combined nucleating agent are relatively small in inter-piece color difference.

The invention belongs to the technical field of composite coatings, and particularly relates to a copper-tin electroplating solution and a preparation method and application thereof.The preparation method of the electroplating solution comprises the steps that citric acid is dispersed in water, potassium hydroxide is added, and a reaction solution 1 is obtained; basic cupric carbonate is added into the reaction solution until the solution becomes clear and does not generate bubbles, the solution is cooled, monopotassium phosphate is added, and a reaction solution 2 is obtained; dissolving potassium stannate in a dilute alkali hot solution, and after the potassium stannate is completely dissolved, adding hydrogen peroxide to obtain a reaction solution 3; and adding the cooled reaction liquid 3 into the reaction liquid 2 to obtain the electroplating liquid. The preparation method of the electroplating solution is simple and almost free of pollution, the electroplating solution is used for electroplating a metal test piece, and an obtained plating layer has high corrosion resistance.

The invention discloses a hollow spherical sodium ion battery positive electrode material and a preparation method and application thereof, the chemical formula of the positive electrode material is Na < 2 / 3-y > KyNi < 1 / 3 > Mn < 23 / 24 > La < 1 / 24 > O < 2 >, and y ranges from 1 / 20 to 1 / 10; the preparation method comprises the following steps: (1) weighing sodium carbonate, potassium hydroxide, nickel nitrate hexahydrate, manganese sesquioxide and lanthanum chloride heptahydrate, uniformly dispersing in absolute ethyl alcohol, and uniformly stirring and mixing; (2) drying and grinding a product mixed in the step (1); and (3) calcining the product treated in the step (2) through a muffle furnace to obtain the Na2 / 3-yKyNi1 / 3Mn23 / 24La1 / 24O2 positive electrode material. According to the invention, phase change inhibition and high structural stability maintenance can be realized at the same time, the electrochemical performance of the positive electrode material is improved, and especially the reversibility of the positive electrode material in the charge-discharge process is improved.

The invention relates to the technical field of borosilicate glass, in particular to high borosilicate glass for a fish tank and a preparation method thereof.The high borosilicate glass is prepared from, by weight, 70-75 parts of high-purity quartz sand, 13-15 parts of borax, 2-3 parts of doping materials, 1.5-2 parts of aluminum oxide, 0.3-1 part of sodium oxide and 0.2-0.5 part of potassium oxide; the water pressure resistance and thermal shock resistance of the high borosilicate glass are improved by adding a doping material which is formed by coating a silicon dioxide layer on the surface of boron nitride and is doped with aluminum oxide, lithium oxide and yttrium oxide into a raw material of the high borosilicate glass, and a potassium nitrate and sodium nitrate mixed molten salt system is used for carrying out ion exchange chemical strengthening, so that the water pressure resistance and thermal shock resistance of the high borosilicate glass are improved. Therefore, the long-term water erosion resistance is met, and meanwhile, the light transmittance can still be kept good.

The invention belongs to the technical field of batteries, and discloses a preparation method of a zinc-nickel secondary battery negative electrode active material. The preparation method comprises the following steps: adding ZnO into a KOH solution of saturated ZnO, uniformly mixing, adding Ca (OH) 2, reacting, and aging to obtain the negative active material of the zinc-nickel secondary battery. A hydrothermal coprecipitation method is adopted, used raw materials comprise calcium hydroxide, zinc oxide, potassium hydroxide and the like, and a calcium zincate crystal generated in the preparation process has a quadrilateral crystal form. The crystal form of calcium zincate can be effectively stabilized by controlling hydrothermal coprecipitation conditions. The solubility of the zinc oxide in an alkaline solution is low and is far lower than that of zinc oxide. And due to the characteristic, the concentration of zincate radicals in the electrolyte is remarkably reduced, so that the growth of negative electrode dendritic crystals is effectively inhibited, and the cycling stability and the service life of the zinc-nickel battery are further improved.

The invention belongs to the technical field of battery waste recovery, and particularly discloses a method for recovering valuable metals from a positive electrode material of a waste lithium ion battery. The method provided by the invention comprises the following steps: mixing the positive electrode material of the waste lithium battery with potassium permanganate, potassium hydroxide and water, carrying out a leaching reaction, carrying out solid-liquid separation after the reaction is completed, adding potassium carbonate into filtrate to carry out a precipitation reaction, carrying out solid-liquid separation to obtain filtrate and lithium carbonate precipitate, adjusting the pH value of the filtrate to 6.5-7.5, and carrying out solid-liquid separation to obtain a potassium manganate solution. According to the method, the valuable metals in the positive electrode material of the waste lithium battery can be selectively recycled under the normal-pressure mild condition, and the chemical reagent is recycled by utilizing the disproportionation reaction, so that the production cost is reduced.

The invention belongs to the technical field of labor protection articles, and particularly relates to an environment-friendly butyronitrile glove and a preparation method thereof.The environment-friendly butyronitrile glove comprises a glove core, an environment-friendly butyronitrile rubber layer is fixed to the outer surface of the glove core in a gum dipping mode after the glove core is soaked in pretreatment liquid, and the environment-friendly butyronitrile rubber layer contains carboxyl butyronitrile latex; the environment-friendly butyronitrile rubber material is prepared by firstly pretreating carboxyl butyronitrile rubber latex and then mixing the pretreated carboxyl butyronitrile rubber latex with sodium dodecyl benzene sulfonate, a 5% potassium hydroxide solution, a 50% zinc oxide dispersion liquid, a 50% sulfur dispersion liquid, a 50% zinc dimethyldithiocarbamate dispersion liquid, a 50% titanium dioxide dispersion liquid, color paste and an alkali swelling type thickening agent. According to the invention, triple synergy of standard environmental protection, stable performance and controllable cost is realized, the industrial problem that protection performance, environmental benefits and economical efficiency are difficult to consider in the prior art is solved, and the dual requirements of modern environmental protection and use experience are met.

The invention discloses a potassium ferrate bottom-oriented enrichment slow-release agent and a preparation method and application thereof, and belongs to the technical field of bottom-oriented enrichment slow-release agents, and the preparation method comprises the following steps: S1, adding polyethylene glycol into water glass, dissolving, adding lithium hydroxide, acidifying, aging, washing, drying, grinding and calcining to obtain a modified carrier; s2, adding a potassium hydroxide solid into the hypochlorous acid solution, adding ferric hydroxide, continuously adding the potassium hydroxide solid, stirring at constant temperature, reacting to obtain a black purple solution, cooling, filtering and drying to obtain a potassium ferrate crude product; s3, adding the potassium ferrate crude product in the S2 into a 3M potassium hydroxide solution for dissolving, adding the modified carrier in the S1, stirring under an ultrasonic condition, then adding a potassium hydroxide solid to be saturated, keeping the temperature, standing, carrying out suction filtration, cleaning a filter cake, and drying to obtain a composite material; s4, grinding and sieving the composite material obtained in S3, mixing with a bottom enrichment agent, and tabletting to obtain a potassium ferrate bottom enrichment slow-release agent; the pond substrate can be improved.