508 results about "Ammonium bicarbonate" patented technology

The invention provides a method for preparing sodium carbonate and co-producing ammonium sulfate from sodium sulfate waste salt, and relates to the technical field of chemical engineering. The method comprises the following steps: mixing sodium sulfate waste salt with water for dissolution, mixing the obtained sodium sulfate waste salt solution with an impurity removal agent for impurity removal, and mixing the obtained impurity removal solution with ammonium bicarbonate for double decomposition reaction to obtain a reaction feed liquid; carrying out primary cold separation on the reaction feed liquid to obtain first filtrate and primary sodium bicarbonate; sequentially washing, drying and roasting the primary sodium bicarbonate to obtain a sodium carbonate product; carrying out secondary cold separation on the first filtrate, carrying out solid-liquid separation to obtain a second filtrate and mixed salt, and reusing the mixed salt in the metathesis reaction; and mixing the second filtrate with an acid adjusting agent to adjust the acid, and carrying out evaporative crystallization on the obtained solution to obtain an ammonium sulfate product and an evaporation mother solution. Industrial-grade sodium carbonate and ammonium sulfate are co-produced by using sodium sulfate waste salt, sodium carbonate and ammonium sulfate meet national standard requirements, and the recovery rate of sodium sulfate is greater than or equal to 90%.

This application relates to the field of ceramsite, and specifically discloses a preparation process for two-stage water-retaining ceramsite from coal gangue. The preparation process includes green pellet preparation, drying section, pyrolysis section, decarbonization section, first roasting section, soaking section, second roasting section, and cooling section; the green pellet preparation includes: wetting coal gangue powder with an organic solution, stirring evenly, and kneading with biomass material. The mass ratio of coal gangue powder to biomass material is 1 kg:(3-9) g to obtain green pellets; the soaking section includes: transferring the green pellets after the first roasting section to the soaking section, with the material layer temperature below 900 °C, and evenly spraying nano-silica during the transfer process, spraying 1-2.5 g per 100 g of green pellets; the cooling section includes: using one of sodium bicarbonate solution, ammonium bicarbonate, and ammonia water to form a water mist mixed with air to cool the roasted ceramsite. The prepared ceramsite has a rich and gradient pore structure, can quickly absorb water, and has excellent water-retaining performance.

The invention relates to the technical field of new energy materials, in particular to a metal oxide heterojunction catalyst and a preparation method and application thereof in hydrogen peroxide production. The preparation method comprises the following steps: taking soluble zinc salt and urea as raw materials, carrying out hydrothermal reaction to obtain zinc oxide, then taking soluble nickel salt and zinc oxide as raw materials, carrying out coprecipitation reaction under the action of ammonium bicarbonate, and calcining in air to obtain the metal oxide heterojunction catalyst. The preparation steps are simple and convenient, the product is prepared in the air atmosphere, in the obtained metal oxide heterojunction catalyst, the surfaces of the zinc oxide microspheres are uniformly coated with the nickel oxide nanosheets, the specific surface area is large, the number of active sites is large, the nickel oxide nanosheets and the zinc oxide microspheres form a heterojunction structure, and the metal oxide heterojunction catalyst has good catalytic activity. The defects of a catalyst for producing hydrogen peroxide through electro-catalysis water oxidation and a preparation method in the prior art are overcome.

The embodiment of the invention discloses a fluorine removal agent and a fluorine removal process for rare earth feed liquid. The fluorine removal agent comprises a first fluorine removal agent and a second fluorine removal agent, the first fluorine removal agent is polycrystal system composite calcium, the polycrystal system composite calcium is composed of calcium oxide / calcium hydroxide and calcium carbonate according to the mass ratio of (0.1-1): (0.1-1), and the second fluorine removal agent is composed of polycrystal system composite calcium and an inorganic flocculant according to the mass ratio of (0.01-1): (0.01-1). According to the method, fluorine is removed under the condition that the pH value is 4.6-5.8, fluoride composite salt precipitation is formed, fluorine in the rare earth solution can be efficiently removed, rare earth carbonate precipitated from subsequent oxalic acid or carbonate (sodium carbonate, sodium bicarbonate, ammonium bicarbonate and the like) or high-concentration rare earth feed liquid can be recycled, and the quality of the rare earth is improved. The requirements (the F content in the mixed rare earth oxide is less than 0.3%, and the F content in the high-concentration rare earth feed liquid (the concentration is greater than 100g / L) is less than 100mg / L) are met. The method is simple in process and high in operability, and has a relatively good application prospect.

The invention relates to the technical field of preparation of composite gel beads, in particular to slow-release-repair gel beads based on a lignin carbon-fulvic acid composite material as well as a preparation method and application of the slow-release-repair gel beads. Comprising the following steps: dispersing sodium lignin sulfonate carbon powder in a fulvic acid solution, and drying to obtain a lignin biochar-fulvic acid composite material; the preparation method comprises the following steps: by taking sodium alginate as a carrier, mixing the lignin charcoal-fulvic acid composite material, ammonium bicarbonate and the carrier, dropwise adding into a calcium ion-containing solution, crosslinking to form gel beads, and sequentially filtering, washing and freeze-drying to obtain the slow-release-repair gel beads based on the lignin charcoal-fulvic acid composite material. The slow-release-remediation gel bead based on the lignin carbon-fulvic acid composite material can remarkably improve the heavy metal adsorption and fixation efficiency, has the advantages of intelligent slow release in pH response and improvement of physical and chemical properties of soil, is stable in structure, environmentally friendly, high in adaptability, multiple in effect, low in cost and high in benefit, and overcomes the defects in the prior art.

The invention discloses a method for reducing the content of rare earth carbonate oil, which comprises the following steps: adding rare earth carbonate seed crystals and pure water into a precipitation tank, feeding a rare earth chloride solution after extraction separation into the precipitation tank, adding an ammonium bicarbonate solution, and carrying out precipitation reaction to obtain rare earth carbonate; the method comprises the following steps: treating rare earth carbonate with hydrochloric acid, converting into a rare earth chloride solution, and filtering the rare earth chloride solution to remove oil to obtain a refined rare earth chloride solution; adding rare earth carbonate into a precipitation tank as a seed crystal, adding the refined rare earth chloride solution and the prepared ammonium bicarbonate solution into the precipitation tank, and carrying out precipitation reaction to produce oil-free rare earth carbonate. According to the invention, oil entrained in the extraction feed liquid and oil dissolved in the feed liquid can be removed, and the quality of the rare earth carbonate product is improved.

The invention discloses a composite mineral admixture prepared from heat-stewed steel slag and a preparation method of the composite mineral admixture, and the mineral admixture is prepared from the following raw materials in parts by weight: 40-50 parts of heat-stewed steel slag powder, 20-30 parts of granulated blast furnace slag powder, 20-40 parts of fly ash, 0.01-0.1 part of a grinding aid and 0.5-4.0 parts of an exciting agent, wherein the grinding aid comprises glycerol and diethanol isopropanolamine, and the exciting agent comprises diphenyl phosphate, sodium sulfate and ammonium bicarbonate. The preparation method comprises the following steps: mixing calcium bicarbonate and water, spraying the mixture on high-temperature steel slag at 600-800 DEG C, carrying out hot braising under the condition of steam pressure of 0.2-0.5 MPa for 8-12 hours to pulverize the steel slag until the particle size is less than 5-10 mm, and carrying out vertical milling on the pulverized steel slag and a grinding aid for 20-40 minutes to obtain hot-braised steel slag powder; uniformly mixing the heat-stewed steel slag powder, granulated blast-furnace slag powder, fly ash, a grinding aid and an exciting agent in proportion to obtain mixed powder; and finally, grinding the mixed powder for 30-50 minutes by adopting a high-energy planetary ball mill to obtain the cement concrete composite mineral admixture with the specific surface area being greater than or equal to 600m < 2 > / kg. According to the invention, the potential hazard of poor stability of a cement concrete material caused by high f-MgO content in the steel slag is broken through, the steel slag is efficiently utilized to prepare a low-carbon green building material, a composite mineral admixture is developed, and the performance meets the II type requirement in JG / T 486-2015 Composite Admixture for Concrete.

An electrocoagulation (EC) reactor and method for simultaneous CO2 capture and brine desalination. The EC reactor includes a reaction chamber that holds brine solution with contaminants, an inlet tube for CO2 gas mixture supply, and a plurality of electrodes (130), submerged in the brine. The electrodes are connected to a power source, applying a voltage to induce electrochemical reactions that precipitate dissolved salts and heavy metals, reducing brine salinity and contaminants, while capturing CO2 in the form of carbonates to form solid coagulants. The method involves introducing brine into the EC reactor's reaction chamber, adding calcium oxide (CaO) and ammonium bicarbonate (NH4HCO3) to create a homogeneous solution, and applying electric current to dissolve the electrodes, producing solid coagulants. A CO2 gas mixture is introduced to facilitate carbonation reactions, forming precipitates like calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), which are filtered to obtain desalinated brine.

The invention belongs to the technical field of sodium bicarbonate preparation, and particularly relates to a method for preparing sodium bicarbonate through sodium waste salt resource conversion. In order to solve the problems of low yield and low purity of sodium bicarbonate, sodium chloride, sodium sulfate or a mixed salt of sodium chloride and sodium sulfate is used as a raw material and is subjected to double decomposition reaction with ammonium bicarbonate. After the reaction is finished, a sodium bicarbonate crude product and mother liquor are obtained through solid-liquid separation, sodium bicarbonate precipitation of the mother liquor is further promoted by adding a salting-out agent into the mother liquor, then the yield of sodium bicarbonate is increased, the used salting-out agent can be recycled, and the purity of the sodium bicarbonate product is improved in a washing mode. According to the method for improving the yield and purity of sodium bicarbonate prepared from sodium chloride / sodium sulfate, a feasible scheme is provided for resource utilization of industrial waste salt and high-salt wastewater.

The invention discloses a recycling method of NF3 residual electrolysis liquid, and relates to the technical field of residual electrolysis liquid recycling treatment. The method comprises the following steps: step 1, removing Fe ions in the electrolytic residual liquid: firstly, adding hydrogen peroxide or oxygen into the electrolytic residual liquid for reaction, oxidizing ferrous ions into ferric ions, then adding ammonia water and sodium hydroxide or ammonium bicarbonate and sodium hydroxide into the solution for reaction, precipitating ferric ions in the form of ferric hydroxide; 2, hydrofluoric acid is added into the electrolyte solution obtained after iron removal to adjust the pH of filtrate to 3-12, the filtrate enters an extraction system, the nickel element in ammonium hydrogen fluoride is extracted out, and ammonium hydrogen fluoride is purified; and step 3, the nickel element separated from the electrolyte enters a second section to be extracted and synthesized into a nickel sulfate product.

A method and equipment for recycling alumina red mud. First, the alumina red mud is added to a mixed acid of hydrochloric acid and sulfuric acid for reaction to dissolve metals such as iron, aluminum, calcium, sodium, and a small amount of zinc, copper, magnesium, etc., and the solid silicon dioxide is left to be separated as building materials or glass raw materials; after the solution is collected, ammonium bicarbonate is added to obtain aluminum, calcium, and some metal precipitates and separated. Iron and sodium remain in the solution and continue to react with sodium hydroxide to obtain iron hydroxide precipitate and separate out sodium salts. After evaporation of the concentrated solution, iron oxide is obtained as a raw material for steel production; the aluminum, calcium, and other metal precipitates are added to sulfuric acid with a concentration of 90-98% for reaction. After all are dissolved, the solution is subjected to membrane separation and then carbonates are added to obtain calcium carbonate precipitate as a raw material for cement production; after evaporation of the concentrated solution, high-purity alumina is obtained and sent to an aluminum processing plant to produce pure aluminum or aluminum alloy products; the separated sodium salt solution is evaporated to be used as industrial and agricultural salt; the acid mist and harmful gases in the reactor process are treated by an absorption tower and then discharged. The present invention can make full use of the iron oxide, alumina, and effective components of alumina red mud, solves the problem of environmental pollution caused by the large amount of piled-up alumina red mud at present, has a low cost, and is suitable for the current alumina production plants.

The present invention provides a lead-acid battery repair fluid, and its preparation and use methods. The repair fluid comprises the following raw materials: MXene, ammonium acetate, ammonium bicarbonate, sodium ethylenediaminetetraacetate (EDTA), montmorillonite, polymaleic anhydride, sodium polystyrene sulfonate, chloroethyl polyvinylpyridinium salt, polyvinylpyrrolidone (PVP), sodium alginate, and deionized water. The repair fluid can effectively dissolve lead sulfate crystals and form a durable and stable protective film on the electrode plates, thereby regenerating the lead-acid battery while effectively preventing further lead sulfate crystals from adhering to the electrode plates, thereby increasing the battery's service life. Furthermore, the raw materials used in the present invention are safe and harmless to the human body, and the preparation method is simple, efficient, and environmentally friendly.

The invention relates to honeycomb activated carbon capable of highly adsorbing atmospheric pollutants and a preparation process thereof, and belongs to the technical field of activated carbon preparation. The preparation process of the honeycomb activated carbon with high adsorption of the atmospheric pollutants specifically comprises the following steps: mixing coconut shell powder, basalt fibers and ammonium bicarbonate, then adding a silica sol solution, carrying out ultrasonic treatment, pressing the obtained mixture by using a honeycomb mold, carrying out freeze molding to obtain a honeycomb solid, carrying out gradient heat treatment, carrying out acid pickling, then washing with water to be neutral, and drying to obtain the honeycomb activated carbon with high adsorption of the atmospheric pollutants. Drying to obtain the honeycomb activated carbon. The silica sol solution is uniformly dispersed in the raw materials through ultrasonic treatment, and freezing forming and gradient heat treatment are performed, so that the adsorption performance and the mechanical strength of the honeycomb activated carbon are improved.

Water is added into manganese dioxide powder to prepare manganese slurry, ammonia water or ammonium bicarbonate is used for adjusting the pH value, sulfur-containing flue gas enters a desulfurizing tower to react with the manganese dioxide mineral powder and the manganese slurry to remove sulfur dioxide, manganese sulfate slurry is generated and can be used for obtaining high-purity manganese sulfate, and ammonium sulfate generated through the reaction can be recycled. The process is mild in production condition, SO2 in the flue gas is converted into available manganese sulfate, resource recycling of sulfur dioxide in the flue gas can be achieved, economic benefits are generated, meanwhile, environmental pollution is reduced, and a technical route is provided for sulfur-containing flue gas treatment and resource utilization. The produced manganese sulfate can be used for preparing high-quality battery-grade manganese sulfate, a raw material is provided for the new energy battery industry, and the market competitiveness of enterprises is improved. The process method provided by the invention accords with the concept of combining ecological environment protection and economic development, and has a relatively high application value.

The invention discloses a nitrogenous fertilizer for cigars, a fertilizer and application. A nitrogenous fertilizer for cigars comprises a nitrate nitrogenous fertilizer and an ammonium nitrogenous fertilizer, and the molar ratio of the nitrate nitrogenous fertilizer to the ammonium nitrogenous fertilizer is (0.66-1.50): 1. The nitrate nitrogen fertilizer is potassium nitrate and / or calcium nitrate, and the ammonium nitrogen fertilizer is ammonium bicarbonate. The molar ratio of the nitrate nitrogen fertilizer to the ammonium nitrogen fertilizer is 1: 1. The invention also provides a fertilizer for cigars. The fertilizer comprises any nitrogen fertilizer for cigars. The fertilizer comprises the following components in parts by weight: 20-60 parts of decomposed oil cake, 20-40 parts of nitrogen fertilizer, 10-30 parts of phosphate fertilizer and 30-60 parts of potash fertilizer. The thoroughly decomposed oil cake is a thoroughly decomposed sesame cake. The nitrogenous fertilizer can improve the soil environment of the tobacco plant root zone, is beneficial to increasing the content of acid phosphatase in the soil, promotes the root development of the tobacco plant, increases the number of effective leaves, and can balance chemical components in cigar leaves.

The invention relates to gradient pore structure honeycomb activated carbon and a preparation process thereof, and belongs to the technical field of activated carbon. The invention provides a preparation process which comprises the following steps: mixing coconut shell powder, microencapsulated ammonium bicarbonate, diatomite and deionized water, pressing with a honeycomb mold, and drying to obtain a honeycomb body; mixing coconut shell powder, calcium hydroxide and a carboxymethyl cellulose sodium solution to obtain slurry; dipping a honeycomb body in the slurry, curing to obtain the treated honeycomb body, and then carrying out three-section gradient heating treatment to obtain the honeycomb activated carbon with the gradient pore structure. The microencapsulated ammonium bicarbonate and the surface slurry containing calcium hydroxide are introduced in the process of preparing the honeycomb activated carbon, and gradient pores are gradually formed through three-section gradient heating, so that the adsorption performance of the activated carbon is improved.

The invention discloses a domestication method for efficiently degrading tobacco waste to produce hydrogen by using mixed flora, which comprises the following steps: carrying out anaerobic enrichment domestication culture by taking manure compost as a bacterial source and cellulose prepared from tobacco waste as a core component of a domestication culture medium; the domestication culture medium contains cellulose, ammonium bicarbonate and monopotassium phosphate, and the cellulose concentration gradient is gradually increased without adjusting the pH value; stopping culturing when the hydrogen content in the biogas is reduced by 10%, transferring the biogas to a fresh domestication culture medium for passage according to an inoculum size of 10-20%, and continuously domesticating for 20-40 rounds; inoculating the domesticated mixed flora culture solution into a cellulose liquid fermentation culture medium containing microcrystalline cellulose, ammonium bicarbonate, monopotassium phosphate and a nutrient solution according to the inoculum size of 10-20%; the initial pH of the fermentation liquor is adjusted to 6.5-7.5, high-purity nitrogen is introduced to create an anaerobic environment, and hydrogen is produced through fermentation under the conditions of 35 + / -1 DEG C and 120 r / min. According to the method, flora is easy to culture, hydrogen production is efficient and stable, tobacco waste resources can be utilized, flora stability is high, adaptability is high, and strict sterile conditions are not needed.

The application discloses a preparation method and purification process of copper hydroxide, a certain amount of anhydrous copper sulfate is accurately weighed, and a certain volume of deionized water is added to prepare a solution with a certain concentration, a copper ammonia solution is prepared: slurry is prepared from circuit board sludge, screening is performed, ammonium bicarbonate or ammonium carbonate is added for reaction, and a copper ammonia solution containing carbonate or bicarbonate is obtained through purification; in addition, high-purity copper powder is added into concentrated ammonia water, concentrated hydrogen peroxide solution is slowly dropped into the concentrated ammonia water, and the dropping is continued until no large amount of bubbles is generated in the solution, and the solution is filtered to obtain a clear indigo blue solution. The production process adds the step of adding a stabilizer and stirring, guarantees the stable state of the copper hydroxide crystal, and enables the copper hydroxide crystal to remain unchanged into copper oxide for one year in an environment with a temperature as high as 60 degrees.

The invention discloses a high-concentration multi-element slow-release blended fertilizer which is prepared from nutrient elements, plant hormones, ammonium bicarbonate, ammonium phosphate, potassium chloride, magnesium oxide, sub-volcanic rock, kaolin, urea, bentonite, calcium oxide, compound microorganism bacteria, diammonium hydrogen phosphate, potassium sulfate, crop waste residues, a fermentation accelerant and animal waste. The fertilizer comprises the following components in parts by weight: 2-5 parts of nutrient elements; 1-3 parts of plant hormones; and 10-15 parts of ammonium bicarbonate. The organic fertilizer and the inorganic fertilizer are combined, the product is green and environment-friendly, the utilization rate of the fertilizer is increased, the fertilizer efficiency is more remarkable, the effects of further activating soil nutrients and fertilizing soil can be achieved, root growth and cell division can be promoted, crop disease resistance can be improved, conversion and absorption of nutrient elements such as nitrogen, phosphorus and potassium in the fertilizer can be accelerated, and the fertilizer efficiency is improved. And moreover, the negative influence of the fertilizer on the environment can be effectively reduced after long-term use of the fertilizer, so that the fertilizer has good social and economic benefits.

The invention provides a detection reagent for detecting ovarian cancer based on an oligosaccharide chain and a preparation method and application thereof, the detection reagent is prepared by mixing the following reagents: a reagent A, which is prepared by adding SDS with the mass concentration of 1-5% into an ammonium bicarbonate solution with the concentration of 10mM and the pH value of 8.3; the reagent B is prepared by mixing 0.05-10 units / 10 microliters of glycosamine acylase, NP-40 with the mass concentration of 10% and an ammonium bicarbonate solution with the concentration of 10 mM and the pH value of 8.3, and the pH value of the mixed solution is 5-9; the reagent C is an organic matter reducing agent with the concentration of 0.02 mM to 1M, which is prepared by dissolving 8-aminopyrene-1, 3, 6-trisulfonic acid in DMSO (Dimethylsulfoxide); and a reagent D: a stop solution. According to the present invention, the natural oligosaccharide N-glycome map in the serum is determined through the reagent, the peak value is quantified, and the statistical analysis is performed, such that the establishment method of the ovarian cancer serum natural oligosaccharide N-glycome map model is provided, and the ovarian cancer is detected by determining the change of the natural glycosylation modification of the protein under the physiological and pathological state.

The invention belongs to the technical field of seedling culture. The invention provides a special nutrient solution for floating seedling raising of tobacco. The nutrient solution comprises the following components: 1000g of water, 0.3-0.5 g of acorus calamus and goldhair hedyotis herb aqueous extract fermented product, 0.1-0.3 part of corn straw steam explosion enzymolysis fermented product, 0.2-0.4 g of calcium ammonium nitrate, 0.6-0.8 g of potassium sulfate, 0.3-0.5 g of ammonium bicarbonate, 0.3-0.5 part of ammonium dihydrogen phosphate, 1-2mg of boric acid and 1-2mg of zinc sulfate. The nutrient solution special for tobacco floating seedling raising can remarkably improve the emergence rate of floating seedling raising, improve the seedling strengthening index and greatly reduce the disease index of tobacco infected with black shank; when the special nutrient solution for tobacco floating seedling raising is prepared, the used technical treatment means are mature technologies in the industry, so that the special nutrient solution has higher feasibility and high industrial application value.

The invention discloses a continuous flow synthesis method of chloracetyl-L-glutamine and glycyl-glutamine, and belongs to the technical field of organic synthesis. According to the invention, molecular-level efficient mixing and heat conduction of materials are realized, so that the reaction materials are fully mixed, the reaction is more sufficient, the conversion rate is further improved, and the process operation is safe and controllable. The micro-channel reactor has the advantages that equipment is relatively small, the reaction is continuous flow, the feed flux is large, the occupied area of the equipment is reduced, and the productivity is improved. Through a micro-channel continuous flow method, ammonia water or ammonia gas is directly adopted without adding ammonium bicarbonate, the problem that the ammonia water cannot be used mechanically is solved, the recycled ammonia water treated after reaction can be directly used mechanically, three wastes are thoroughly solved, and the production process is green and environment-friendly. The glycyl-L-glutamine is totally synthesized through micro-channel continuous flow, the product purity HPLC (High Performance Liquid Chromatography) of the glycyl-L-glutamine reaches 99.5% or above, and the single impurity content is less than 0.1%.

This invention relates to the field of wastewater treatment technology, specifically to a highly efficient adsorbent wastewater treatment agent and its preparation method, comprising the following raw materials in parts by weight: 50-70 parts activated carbon powder, 8-12 parts deionized water, 5-10 parts ammonium bicarbonate, 1-3 parts sodium dodecyl sulfate, 15-25 parts additive A, and 8-15 parts additive B. In this invention, the stably loaded cerium ions can effectively exert their specific coordination and capture effect on heavy metals. The chitosan introduced into the carrier can enhance the electrostatic and chelate adsorption of anionic pollutants and organic molecules. Simultaneously, the well-developed pores formed after shellac carbonization combine with the network structure of chitosan, further increasing the specific surface area of ​​the material and the adsorption capacity of organic pollutants, achieving highly efficient and stable adsorption of heavy metals, dyes, and organic pollutants.

This invention discloses an acetic acid-modified inorganic composite gel material and its preparation method, belonging to the field of organic material synthesis technology. The acetic acid-modified inorganic composite gel material comprises the following materials in parts by weight: 0.2-0.4 parts of acetic acid-Co3O4, 1.5-2.5 parts of acrylamide, 1-1.5 parts of glycerol, 0.05-0.1 parts of N-N-dimethylformamide, 0.25-0.5 parts of ammonium persulfate, 0.1-0.15 parts of sulfonated-Bi2O3, 0.6-0.9 parts of ethylenediamine, and 0.2-0.4 parts of PVP; the acetic acid-Co3O4 comprises materials in the following mass ratio: acetic acid:cobalt nitrate:thiourea:ammonium fluoride:sodium bicarbonate = 3-7:1.5-2.5:0.8-1.2:0.5-1:6; the sulfonated-Bi2O3 comprises materials in the following mass ratio: Bi2O3:sodium sulfite:H2O2:ammonium bicarbonate = 3-5:0.2-0.6:1-1.5:1. This material achieves efficient and stable catalysis for nitrogen reduction under mild conditions through structural defect regulation, interfacial functional group modification, heterojunction electronic regulation, and synergistic enhancement with organic gel.

The invention belongs to the technical field of tungsten alloys, and particularly discloses a tungsten alloy catalyst and a preparation method thereof.The preparation method comprises the steps that tungsten powder, iron powder, cobalt powder, manganese powder, yttrium oxide powder and titanium oxide powder serve as raw materials, graphene serves as an activating agent, the raw materials are blended, then special pore forming of ammonium bicarbonate and rubidium hydroxide and corrosion of nitric acid are conducted, and the tungsten alloy catalyst is obtained. The tungsten alloy catalyst with excellent catalytic activity is obtained by coating a tin compound (changed into tin oxide through heat treatment), finally carrying out three times of heat treatment, eliminating internal stress in the alloy through the first time of heat treatment, inducing generation of metastable intermetallic compounds through the second time of heat treatment and finally carrying out high-temperature sintering, and the tungsten alloy catalyst can be used for catalytic hydrogen production.

This invention belongs to the technical field of rare metal extraction, specifically relating to a method for defluorinating rare earth ore leaching solutions. The steps are as follows: S1, adding ammonium bicarbonate to the rare earth ore leaching solution, clarifying, and then separating the solid and liquid to obtain filtrate A and filter residue A; S2, adding ammonium bicarbonate to filtrate A, separating the solid and liquid to obtain filtrate B and filter residue B; S3, adding concentrated sulfuric acid to filter residue A, adding filtrate B from step S2, separating the solid and liquid to obtain filtrate C and filter residue C; S4, adding oxalic acid solution to filtrate C, stirring and reacting, clarifying, and then filtering to obtain filtrate D and filter residue D; S5, adding calcium or magnesium salts to filtrate D, separating the solid and liquid to obtain CaF2 or MgF2 filter residue and filtrate E; S6, mixing filtrate B and filtrate E, recovering and continuing to use for leaching rare earth ore, with filter residue B and filter residue D being the defluorinated rare earth products. This method can eliminate fluoride ions at the source, improving the subsequent rare earth metal extraction rate and quality.

The invention discloses a method for preparing PDLLA porous microspheres with high porosity and uniform particle size distribution in batches, and belongs to the technical field of polymer biomedical material preparation. According to the method, an ultrasonic-assisted double-emulsification system is combined with an inner water phase (an ammonium bicarbonate solution), an oil phase and an outer water phase (a polyvinyl alcohol solution), and a staged curing process is adopted to realize accurate regulation and control of a pore structure and a particle size. Petroleum ether is introduced as a poor solvent to optimize the precipitation uniformity, ultrasonic and mechanical stirring synergistically improve the emulsification uniformity, and staged curing ensures that the solvent evaporation rate is matched with pore formation. The porosity of the prepared PDLLA microspheres reaches 75%-87%, the SPAN value is as low as 0.512, the pore size distribution is uniform, the process expandability is high, and the method is suitable for the biomedical fields of drug carriers, tissue engineering scaffolds and the like. The technical problems of low porosity, wide particle size distribution and complex process are solved, and the method has a remarkable application prospect.

The invention relates to the technical field of ultraviolet curing coatings, and discloses a rapid acrylic plate coating process based on a nano-composite coating, which comprises the following two steps of: 1, irradiating by using deep ultraviolet light with the wavelength of 254-310 nanometers, triggering a photoinduced base generator to catalyze ammonium bicarbonate to decompose, and then, carrying out irradiation by using ultraviolet light with the wavelength of 254-310 nanometers; the decomposition reaction of ammonium bicarbonate generates gas in situ to form a physical oxygen barrier layer, the endothermic effect inhibits the temperature rise, and the product ammonia gas can also catalyze the thiol-Michael addition reaction on the surface of the coating to form a chemical oxygen sealing layer; 2, a UVA-LED lamp with the wavelength of 395 nanometers is used for irradiation, main body free radical polymerization is efficiently initiated, and deep curing of the coating is achieved. Through the synergistic effect of physical oxygen isolation and chemical oxygen sealing, ultra-fast and defect-free curing can be achieved in the air without nitrogen protection, thermal damage to a thermosensitive base material is avoided, and the service life of the coating is prolonged. And the obtained coating has high hardness and high adhesive force.

The invention belongs to the technical field of ammonium bicarbonate production, and particularly relates to an ammonium bicarbonate production device capable of recovering high-concentration carbon dioxide, which comprises a reaction tank, a liquid inlet pipe arranged on the upper side of the reaction tank, a discharge pipe arranged at the bottom of the reaction tank, and a disturbance mechanism arranged on the reaction tank, a rotating shaft is fixed to an output shaft of the motor, multiple first disturbance blades are arranged on the side wall of the rotating shaft, a spraying pipe is fixed to the bottom of the rotating shaft, and multiple one-way sprayers are arranged at the upper end of the spraying pipe; a shell sleeving the outer side of the rotating shaft is fixed to the mounting frame and connected with an air inlet pipe, and an air inlet communicated with the interior of the shell is formed in the upper end of the air channel; through the synergistic effect of the first disturbance blade of the disturbance mechanism and the second disturbance blade of the auxiliary disturbance assembly, the mixing effect of carbon dioxide and ammonia water is enhanced, the absorption stroke of carbon dioxide is prolonged, the reaction is more sufficient, and thus the reaction efficiency is improved.

COMPOSITION TO DEHYDRATE Tillandsia sp, characterized in that it comprises, in an aqueous solution, a main component selected at least from Na bicarbonate (NaHCO3), ammonium bicarbonate (NH4)HCO3 and calcium hydroxide, for a total, alone or combined with sodium bicarbonate, of from 0.045 g / cm3 of aqueous solution up to 0.10 g / cm3 of an aqueous solution and 0.30 cm3 of a hydroalcoholic solution of carminic acid up to a maximum of 0.80 cm3 / cm3 of an aqueous solution.