926 results about "Ammonium bicarbonate" patented technology

The invention belongs to the field of flotation, and particularly relates to a method for flotation of copper cobalt oxide ore by using magnesium-containing tailing water, the magnesium-containing tailing water is used as flotation water to carry out five-stage roughing on the copper cobalt oxide ore, the first-stage roughing is carried out under a vulcanizing agent and a xanthate-thionocarbamate collecting agent, and the second-stage roughing is carried out under the action of a flotation agent; and the second-stage roughing is carried out under the condition of containing a compound additive, a vulcanizing agent and xanthate-hydroximic acid. The third-stage roughing is carried out under the action of a vulcanizing agent and xanthate-hydroximic acid; and the fourth-section roughing process and the fifth-section roughing process are carried out under the action of a hydroximic acid collecting agent. The compound additive comprises a component A and a component B with a structure shown in a formula 1 (# imgabs0 #); the component A comprises at least one of ammonium carbonate, ammonium bicarbonate, ammonium nitrate, ammonium acetate, ammonium sulfate and ammonium chloride; and the composite collecting agent comprises a xanthate collecting agent and a hydroximic acid collecting agent. By means of the method, the problem of flotation degradation caused by magnesium-containing tailing water recycling can be solved, and the excellent flotation effect can be achieved.

According to the long-acting water-soluble alkali-adjusting fertilizer and the preparation method thereof, raw materials of the long-acting water-soluble alkali-adjusting fertilizer are preferably selected from fully water-soluble materials, the product is fully water-soluble, the content of water-insoluble substances is smaller than 0.2% (G4 water-insoluble substance standard), and the long-acting water-soluble alkali-adjusting fertilizer is suitable for irrigation facilities such as drip irrigation facilities and sprinkling irrigation facilities; urea phosphate is used as a main acidic substance, so that the pH value of the product can be lower than 3.5 after the product is dissolved in water, and the effect of adjusting hard water is achieved; the raw material proportion is optimized, a certain amount of ammonium sulfate and powdery industrial monoammonium phosphate are used, meanwhile, the urea proportion is controlled, the use mode of ammonium bicarbonate after drying is matched, the system moisture is reduced, system dry-wet control is stabilized, the problem of screening deliquescence caused by system material acidity in the product production process is solved, and large-scale productivity is formed.

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%.

The invention relates to the technical field of vanadium metallurgy, and discloses a method for extracting vanadium from calcified vanadium extraction tailings through leaching, which comprises the following steps: S1, carrying out chute reselection on the calcified vanadium extraction tailings to obtain coarse-fraction chute reselection slag and fine-fraction chute reselection slag; s2, performing mechanical activation on ammonium bicarbonate, mixing the coarse-fraction chute reselection slag with ammonium bicarbonate, adding hot water, performing bubbling and stirring reaction, and performing solid-liquid separation to obtain desulfurized slag; and S3, dilute nitric acid, calcium fluoride and hydrogen peroxide are added into the desulfurization residues, a reaction is conducted at the temperature of 70-75 DEG C, and secondary leaching tailings and a vanadium-containing solution are obtained through solid-liquid separation. According to the method, the reselection technology is adopted, 90% or above of calcium sulfate can be directly removed, vanadium can be directly extracted through leaching by adding simple chemical reagents, complex processes such as drying, roasting and re-leaching are not needed, the production cost can be greatly reduced, environmental pollution is reduced, the vanadium leaching rate is larger than 65%, and ammonium sulfate can be recycled in the process for follow-up vanadium precipitation.

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 invention provides a method for deeply extracting vanadium from vanadium-containing steel slag, which comprises the following steps: mixing the vanadium-containing steel slag and an oxygen-containing microbubble ammonium bicarbonate solution, and carrying out mechanochemical ball milling activation to carry out leaching reaction to obtain a vanadium extracting solution. According to the method, advanced oxidation is cooperated with mechanochemical ball milling to activate and strengthen deep extraction of vanadium in the vanadium-containing steel slag, wrapping of substances such as calcium silicate and calcium titanium oxide on a vanadium-containing solid solution phase is destroyed through mechanical activation, and O2 microbubbles in an ammonium bicarbonate medium are promoted to generate active oxygen under excitation of mechanical activation energy; exposure reaction and deep oxidation extraction of a vanadium-containing phase under mild conditions are achieved, the content of V2O5 in tailings after vanadium extraction is smaller than or equal to 0.5%, and the vanadium extraction rate is 83% or above.

The invention relates to a preparation method of a silicon-carbon negative electrode material capable of reducing interface side reaction, which comprises the following steps: (S1) carrying out chemical vapor deposition on porous carbon by using organic silicon source gas to enable amorphous silicon to be attached in pores of the porous carbon to obtain a silicon-carbon composite material; and (S2) mixing a passivating agent with the silicon-carbon composite material, and then carrying out gradient heat treatment to obtain the silicon-carbon negative electrode material capable of reducing the interface side reaction, the passivating agent is compounded by ammonium carbonate and / or ammonium bicarbonate, C2-C8 aliphatic polybasic acid and organic salt of lithium according to the mass ratio of 1: (1.5-3): (0.8-1.5). All the components in the passivator cooperate with one another, surface amorphous silicon in porous carbon is partially passivated to form a uniform and compact passivation layer, and a small amount of carbon coating layers coating the surface of the porous carbon are formed in the passivation process, so that the interface side reaction of the material is obviously reduced.

The invention provides a preparation method of nano high-purity aluminum oxide and the nano high-purity aluminum oxide, and belongs to the field of aluminum oxide semiconductor materials. Comprising the following steps: obtaining a high-purity aluminum sulfate solution; carrying out continuous synthesis reaction on the high-purity aluminum sulfate solution and the high-purity ammonium bicarbonate solution at a set temperature, and then filtering and washing to obtain a high-purity nano aluminum oxide hydrate filter cake; preparing the high-purity nano aluminum oxide hydrate filter cake into slurry, and then performing spray drying to obtain high-purity nano aluminum oxide hydrate powder; and carrying out two-stage roasting on the high-purity nano aluminum oxide hydrate powder to obtain the nano high-purity aluminum oxide. By controlling the continuous synthesis reaction of aluminum sulfate and ammonium bicarbonate under a constant system condition, the ordered precipitation and batch-to-batch stability of the high-purity nano aluminum oxide hydrate are ensured, and the content of aluminum oxide in the nano aluminum oxide hydrate is increased. Therefore, the amount of waste gas generated by a traditional ammonium salt method is reduced, and meanwhile, the application performance of the nano high-purity aluminum oxide is improved.

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 coal-fired power plant flue gas carbon capture and ammonium fertilizer co-production system and method based on an ammonia process, desulfurized flue gas sequentially passes through a saturation area, an absorption area and an ammonia washing area of a decarburization system, passes through a first-stage ammonia washing spraying layer and a second-stage ammonia washing spraying layer, and finally, purified flue gas is discharged to the atmosphere. After sodium hydroxide, sodium carbonate and a flocculating agent are added into desulfurization wastewater, obtained clear liquid is pumped into a first-stage ammonia washing spraying layer through a clear liquid conveying pump to spray and absorb escape ammonia gas, enters an absorption area slurry box after the pH value reaches the upper limit, and enters a saturation area after the pH value of the absorption area slurry box reaches the upper limit; slurry in the saturation area is subjected to solid-liquid separation through a cyclone and a centrifugal machine, and clear liquid returns to the saturation area again. And the slurry in the saturation area is separated twice by a cyclone and a centrifugal machine to obtain solid ammonium bicarbonate. According to the invention, part of desulfurization wastewater and carbon dioxide in desulfurized flue gas can be cooperatively treated, and the produced ammonium bicarbonate fertilizer can be used for producing ammonium fertilizer or compound fertilizer, and has high economic value.

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 provides a detection reagent for detecting depression 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. The invention firstly proposes that the sugar chain map can be used as the auxiliary diagnosis marker of the depression patient, has high sensitivity and high specificity for the diagnosis of depression, has the prospect of being developed into a clinical auxiliary diagnosis kit for depression, can overcome the difficulty and pain point of clinical diagnosis of depression at present, and has a wide application prospect. The method is of great significance to diagnosis and clinical intervention of depression.

A system and method for water desalination using forward osmosis to address problems associated with scarcity of freshwater around the world. The system uses ammonium bicarbonate as the draw solution to draw out freshwater through a forward osmosis (FO) membrane from an amount of saltwater or other contaminated water initially directed through one side of the FO membrane. The ammonium bicarbonate draws the desalinated water through the membrane of the FO membrane. Brine or other solutes are directed away. The combination of desalinated water and ammonium bicarbonate is directed through a series of valves and pumps, including a heat pump, and through a hydrophobic membrane that allows freshwater (product water) to be obtained from the desalination process in a more cost-effective and efficient manner. The ammonium bicarbonate is recycled and reused to generate additional draw solution for additional batches of saltwater or contaminated water for desalination.

The invention relates to high-aluminum-content basic cobalt carbonate and a preparation method thereof. The method comprises the following steps: 1) preparing a mixed solution from cobalt salt and aluminum salt; (2) adding a small amount of ammonium bicarbonate solution into a reaction kettle, starting heating, adding the mixed solution into the reaction kettle while stirring, controlling the pH value, and reacting to obtain a seed crystal dispersion liquid; and (3) adding the mixed solution and an ammonium bicarbonate solution into the seed crystal dispersion liquid, controlling the pH value, continuously reacting under heating and stirring until the particle size of the basic cobalt carbonate reaches a set value, stopping the reaction, and carrying out filter pressing, washing and drying to obtain the basic cobalt carbonate with high aluminum doping amount. The aluminum doping in the basic cobalt carbonate provided by the invention is as high as 7767-8357ppm, and the aluminum element is uniformly distributed and does not segregate.

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.

The invention discloses a synthesis method and application of a carbonyl sulfide low-temperature hydrolysis catalyst, and the synthesis method comprises the following steps: mixing pseudo-boehmite, ammonium bicarbonate, sodium carbonate and a binder, and granulating to obtain a granular mixture; sequentially drying and calcining the granular mixture, so as to obtain gamma-Al2O3 carrier pellets; and placing the gamma-Al2O3 pellets in an impregnation liquid, carrying out impregnation treatment under pressure, drying, and calcining to obtain the carbonyl sulfide hydrolysis catalyst. According to the invention, gamma-Al2O3 balls are prepared as a carrier, then zirconium, sodium and potassium are loaded on the gamma-Al2O3 balls, gamma-Al2O3 has strong adsorbability to carbonyl sulfide, ZrO2 has good acid resistance and water resistance, and plays a role in protecting the catalyst; the metal such as Na, K and the like exists in the blast furnace gas in the form of carbonate, and the weakly alkaline center reduces the activation energy of the reaction, so that carbonyl sulfide is hydrolyzed into H2S and CO2, and the standard emission of SO2 at the user side of the blast furnace gas is realized by matching with an H2S removal technology.

The invention relates to the technical field of copper-based catalysts, in particular to a copper-based catalyst and a preparation method thereof.The preparation method comprises the steps that a pore-enlarging agent is used for conducting pore-enlarging treatment on aluminum oxide, and a pore-enlarging type aluminum oxide carrier is obtained; fully dissolving copper chloride, samarium chloride and lanthanum chloride by using deionized water, dipping a chambering type alumina carrier in the obtained dissolved solution, standing and filtering to obtain a filter material and a filtrate; carrying out steam explosion treatment on the filter material, then soaking the filter material in the filtrate, standing and filtering to obtain a loaded material; and roasting the loaded material at high temperature to prepare the copper-based catalyst. Starch or methyl cellulose / ammonium bicarbonate is combined to serve as a pore-enlarging agent, the pore-enlarging effect can be greatly improved, steam explosion treatment is carried out, a dissolving solution can be driven to fully enter pore channels of a carrier in a high-pressure environment, and copper, samarium and lanthanum can be driven to be evenly distributed on the surfaces of the pore channels and the carrier in subsequent vaporization flow, so that the pore-enlarging effect is improved. Therefore, the quality of the copper-based catalyst is improved.

The invention provides a preparation method of a boron nitride setter plate, and belongs to the technical field of boron nitride setter plates. The preparation method comprises the steps of material mixing, cold isostatic pressing forming and vacuum sintering. The material mixing step comprises the following steps: putting hexagonal boron nitride powder with the particle size of 100-200nm, hexagonal boron nitride powder with the particle size of 1.0-3.0 mu m, hexagonal boron nitride powder with the particle size of 4.0-10.0 mu m, ammonium bicarbonate, phenolic resin and sodium tripolyphosphate into a ball-milling device, adding absolute ethyl alcohol for ball-milling treatment, then adding a secondary compound for continuous ball-milling for 23-28min, and after ball-milling is finished, cooling to room temperature to obtain the boron nitride composite material with the particle size of 100-200nm, the particle size of 1.0-3.0 mu m, the particle size of 4.0-10.0 mu m and the particle size of 1.0-3.0 mu m and the particle size of 4.0-10.0 mu m. Drying at 87-92 DEG C to obtain dry powder; the boron nitride setter plate prepared by adopting the method disclosed by the invention is high in mechanical strength and strong in toughness, and can still keep relatively high mechanical strength after repeated cold and heat cycles.

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 discloses a lignin-based hydrogel water-retaining agent as well as a preparation method and application thereof, and belongs to the technical field of soil water retention improvement. The preparation method provided by the invention comprises the following steps: dissolving lignin under an alkaline condition to form a uniform solution; adding a polymerization reaction monomer into the uniform solution, stirring and mixing, sequentially adding an initiator, an accelerant, a cross-linking agent and a regulator, and stirring and reacting to obtain a reaction solution; the regulator is selected from one or more of clay, zeolite, ammonium bicarbonate, potassium carbonate or calcium superphosphate; injecting the obtained reaction liquid into a mold, and performing ultrasonic treatment to form hydrogel; the hydrogel is cleaned and aged, and the hydrogel is obtained. The preparation method is simple, environmentally friendly, low in energy consumption, short in process, wide in raw material source, low in cost and suitable for industrial production, and the obtained lignin-based hydrogel water-retaining agent is free of toxicity and pollution and has excellent water absorption performance and biodegradability.

The utility model relates to the technical field of ammonium bicarbonate processing, and provides a metering adder for powdery ammonium bicarbonate, which comprises an adding cover, a flow guide pipe is arranged at the lower end of the adding cover, a vibration screening component is arranged in the adding cover, and a fixed-frequency blanking component is arranged in the adding cover; the vibration screening assembly comprises two positioning shafts, the positioning shafts are arranged on the surfaces of the two opposite sides in the adding cover, a screening frame is connected to a positioning sleeve, a filter screen is arranged in the screening frame, an output motor is arranged on the outer side wall of the adding cover, and the output end of the output motor is inserted into the adding cover. And a driving cam is arranged at the output end of the output motor, is arranged in the adding cover and is in contact with the screening frame. By means of the technical scheme, the problems that in the prior art, powdery ammonium bicarbonate particles are large and can be accumulated, the use effect can be affected by the large particles, and the feeding amount control effect is insufficient are solved.

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.

The invention provides a low-energy-consumption preparation process of tetramethylammonium bicarbonate, and relates to the technical field of chemical synthesis. The preparation process comprises the following steps: inputting trimethylamine, dimethyl carbonate and a solvent methanol into a reactive distillation tower, carrying out a quaternization reaction to generate methyl carbonate tetramethylammonium, and carrying out a hydrolysis reaction on a first liquid phase obtained by rectification and water vapor to generate TMAB; the reacted material is input into a methanol removal tower for rectification, an obtained second gas phase is heated and pressurized, one part of the second gas phase is input into a subsequent methanol recovery tower, the other part of the second gas phase exchanges heat with water to generate steam, the steam is input into a tower kettle of the methanol removal tower, and high-purity methanol is extracted from the side of the methanol recovery tower. The number of reaction equipment is reduced, and the energy utilization rate is increased; the steam grade is improved by utilizing a heat pump technology, and steam latent heat is integrated between the methanol removal tower and the methanol recovery tower through thermal coupling, so that the overall process energy consumption is remarkably reduced while the product quality is ensured.

The invention discloses a preparation method of a zirconium oxide catalyst and application of the zirconium oxide catalyst in catalytic co-production of hydrogen and carbon monoxide, and belongs to the technical field of resource recovery, and the preparation method comprises the following steps: (1) dissolving a zirconium source and a complexing agent in water, and stirring at a high speed to obtain a clear solution; (2) dropwise adding alkali liquor into the solution obtained in the step (1) to adjust the pH value of the solution, then adding a dispersing agent, and refluxing and stirring the obtained solution for 10-12 hours at a certain temperature; (3) adding ammonium bicarbonate into the solution obtained in the step (2), then transferring the solution into a crystallization kettle, and crystallizing at a certain temperature; (4) filtering, washing, drying and grinding the product obtained in the step (3) into powder, and then putting the powder into dielectric barrier discharge plasma equipment for treatment; and (5) roasting the treated sample obtained in the step (4) in a muffle furnace to obtain the zirconium oxide catalyst. The catalyst is simple in preparation method, high in repetition rate and suitable for large-scale industrial production.

The invention provides a neutralization and utilization method of an acidic waste etching solution. The method comprises the following steps: mixing the acidic etching waste liquid with an ammonium bicarbonate solution; in the mixing process, the mixing temperature is controlled to be 40-60 DEG C, the pH value is adjusted to be 3.5-4.5, and slurry is obtained; separating the slurry to obtain copper oxychloride wet crystals and an ammonium chloride crude product solution; carrying out dechlorination treatment on the copper oxychloride wet crystals by using an alkaline solution, and filtering to obtain a copper oxide filter cake and chloride waste liquid; the temperature of the dechlorination treatment is 70-90 DEG C; performing post-treatment on the copper oxide filter cake to obtain copper sulfate; and carrying out precipitation treatment on the ammonium chloride crude product solution to obtain an ammonium chloride finished product solution. Wherein the step S3 and the step S4 have no sequence. According to the method, electroplating-grade copper sulfate and industrial-grade ammonium chloride products are prepared by using ammonium bicarbonate and realizing full utilization of anions and cations in the acidic etching waste liquid.

The invention provides a thick electrode plate without residual multi-step holes, a preparation method of the thick electrode plate and a lithium ion battery. According to the preparation method, the current collector is obtained; sequentially carrying out n times of coating operation on the slurry; the slurry for the first coating operation does not contain ammonium bicarbonate solid particles; slurry from the second coating operation to the nth coating operation contains ammonium bicarbonate solid particles, and the use amount of the ammonium bicarbonate solid particles used in each coating operation is increased along with the increase of the coating operation times; and sequentially carrying out drying operation and rolling operation on the slurry after each coating operation, so that the ammonium bicarbonate solid particles are gasified during drying, and the obtained non-residue multi-stepped-hole thick electrode plate forms a down-gradient-difference porous structure. According to the preparation method, the characteristic that the ammonium bicarbonate solid particles are easy to decompose at low temperature and free of residues is utilized, on the premise that it is guaranteed that the porous structure along the gradient difference is prepared, the phenomenon that the coating is prone to cracking in the drying process is avoided, and drying energy consumption is reduced.

The invention relates to an integrated system and method for co-producing ammonium bicarbonate and methanol through air energy storage. According to the integrated system, the air energy storage subsystem, the ammonia synthesis subsystem, the methanol synthesis subsystem and the ammonium bicarbonate synthesis subsystem are coupled and connected, and coupled co-production of ammonia gas, methanol and ammonium bicarbonate is realized in the process of energy storage and power generation by using the air energy storage subsystem; and large-scale energy storage and consumption of each subsystem and cyclic utilization of various by-products can be realized, and the realization of the dual-carbon target can be assisted in multiple directions. Wherein the ammonia synthesis subsystem and the methanol synthesis subsystem are respectively connected with the air energy storage subsystem through at least one group of synthesis heat recovery loops, so that reaction heat of each subsystem is recycled for heating compressed air, the temperature of an expansion acting inlet of the air energy storage subsystem is increased, and the power generation efficiency of the air energy storage system is improved.