36 results about "Diammonium carbonate" patented technology

The invention discloses a method for preparing low-ash-content activated carbon from coconut shells, and belongs to the technical field of activated carbon. Comprising the following steps: crushing, ball-milling and sieving coconut shells to obtain a material A; soaking the material A in a hydrochloric acid solution, heating, stirring, washing and drying in vacuum to obtain a material B; mixing the material B with deionized water, and adding sodium hydroxide, ammonium carbonate and diammonium hydrogen phosphate to obtain a material C; performing oxidation treatment on the material C to obtain a material D; the material D is taken for carbonization treatment and activation treatment, coconut shell activated carbon with low ash content is obtained, the ash content is reduced, and high-quality activated carbon is obtained.

The application discloses a preparation method of a binary transition metal aluminide nanocatalyst and application thereof. First, a mixed metal salt solution is mixed with an ammonium carbonate solution to obtain a metal oxide precursor through co-precipitation. Then, the oxide precursor is mixed with a low-temperature composite molten salt and is subjected to thermal reduction under a specific atmosphere. Through simple post-processing, a single-phase binary transition metal aluminide nanocatalyst with high catalytic activity is obtained. The non-noble metal aluminide nanocatalyst prepared is applied to a reaction of catalytically selectively hydrogenating acetylenes to prepare olefin compounds. Under mild conditions, 99% conversion of reactants is achieved while maintaining 96% olefin selectivity. Compared with a traditional supported catalyst, the metal aluminum atom greatly regulates the electronic and geometric structures of the transition metal atom, effectively improves the catalytic activity, and significantly improves the structural stability of the catalyst. The material has high phase purity, is easy to separate and recycle, and has good application prospect.

The invention discloses a method for mineralizing, reinforcing and protecting weathered sandstone cultural relics through carbon sequestration bacteria, and belongs to the technical field of cultural relic protection and restoration. In order to solve the problems of residue of deliquescent anionic salt and generation of bad byproduct ammonia gas in the existing technology for reinforcing and protecting sandstone cultural relics by microbial mineralization, the reinforcing depth and strength are improved in a lower-carbon and higher-efficiency manner, and an aspartic acid chelated calcium liquid containing low-solubility active magnesium oxide is effectively permeated into weathered sandstone; the carbon capture and nucleation effects of the bacillus mucilaginosus with the carbon sequestration function are utilized, on one hand, carbon dioxide in air is captured and converted into carbonate needed by mineralization, on the other hand, carbonate in an ammonium carbonate solution which is easy to volatilize and decompose is locked and used for carbonate mineral crystallization, and meanwhile ammonium ions are inhibited from being converted into ammonia gas to overflow; calcium carbonate and basic magnesium carbonate are induced to be subjected to intercrystallization nucleation, and a high-strength cementation structure is formed in pores of the weathered sandstone and is used for permeating, reinforcing and protecting the weathered sandstone cultural relics.

Provided are a magnetic lithium extraction adsorbent, and a preparation method therefor and the use thereof. The preparation method comprises the following steps: (1) mixing an iron salt, a ferrous salt, an aluminum salt and a hydrophilic organic polymer with a solvent to obtain a mixed solution; (2) adding the mixed solution into an alkali-lithium salt-ammonium carbonate-ethanol mixed solution dropwise via an electrostatic spraying device by using an injection pump to obtain microspheres; and (3) carrying out a post-treatment on the microspheres to obtain a magnetic lithium extraction adsorbent. The adsorbent prepared by means of the method is magnetic and can realize solid-liquid separation by means of a magnet, without filtering brine and other operations, such that a lithium extraction process is simpler and more convenient.

This invention relates to a method for recovering ammonium components during the production of sodium bicarbonate from sodium sulfate, belonging to the field of chemical production technology. The recovery method includes: pretreating a crystallization mother liquor containing sodium sulfate, ammonium sulfate, ammonium bicarbonate, and diammonium carbonate, then mixing it with sodium sulfate and crystallizing to obtain a liquid-solid mixture; separating fine particles from coarse crystals in the liquid-solid mixture to obtain a coarse crystal slurry and a slurry containing fine particles, respectively; performing solid-liquid separation on the obtained coarse crystal slurry to obtain a double salt and a filtrate; and mixing the obtained double salt with a solution for washing to obtain solid sodium sulfate and a solution of ammonium sulfate. The recovery method provided by this invention has advantages such as a short process flow, simple operation, and no environmental pollution risk. This method not only avoids high-temperature ammonia stripping and low-temperature freezing processes, reducing investment and operating costs and energy consumption, but also improves the ammonia recovery rate and enhances raw material utilization efficiency.

The present application relates to the technical field of ceramic tile processing, and particularly relates to a ceramic tile surface coating material, a preparation method and application. The coating material is prepared from modified lithium tailing composite powder, zinc-aluminum-boron-silicon fused block, albite, nepheline syenite, calcined kaolin, calcined alumina, wollastonite, calcined talc and dolomite and the like. The modified lithium tailing composite powder is prepared by interfacial modification of low-iron refined lithium tailing powder with phytic acid, zirconium ammonium carbonate, dihydroxy bis(ammonium lactate) titanium(IV), calcium lactate, ammonium pentaborate and polyacrylammonium crystallization inducers and heat treatment. The coating material can improve the whiteness and gloss of the glaze layer, reduce the yellowing tendency, reduce pinhole and cave defects, and realize high-value utilization of lithium tailings in ceramic tile surface decoration.

The present application relates to a positive electrode material, a method for preparing same, and use thereof. The method of the present application comprises the following steps: providing a metal salt solution comprising Ni2+, Co2+, Mn2+, and Al3+; dropwise adding a precipitant solution to the metal salt solution, so as to give a lactate precursor, the precipitant solution comprising lactic acid and ammonium carbonate; and co-sintering the lactate precursor and a lithium source. The method of the present application can achieve precise control of the molar proportions of nickel, cobalt, manganese, and aluminum to prepare a positive electrode material having a qualified chemical composition.

The present invention discloses a CoMn solid solution composite oxide catalyst, a preparation method and its application in catalytic oxidation of toluene. The catalyst is a Co-O-Mn solid solution formed by dissolving Co species into a MnO2 lattice, and the mass fraction of Co3O4 in the catalyst is 0.5-10wt%. The preparation method comprises: dissolving manganese nitrate and cobalt nitrate in deionized water to obtain liquid A; dissolving ammonium carbonate in deionized water and ultrasonically treating to obtain liquid B; dripping liquid B into liquid A drop by drop under stirring to obtain a mixed solution; heating the mixed solution in a water bath and stirring to obtain a precipitate; centrifuging and drying the precipitate, and calcining in an air atmosphere to obtain a CoMn solid solution composite oxide catalyst. The catalyst preparation step of the present invention is simple, the conditions are mild, and it has good low-temperature toluene catalytic oxidation activity, good catalytic stability and water resistance.

The invention relates to the field of adsorbent preparation, and particularly discloses a preparation method and application of a polyamino nano-alumina adsorbent, and the preparation method comprises the following steps: S1, preparing a 1.2 mol / L composite aluminum salt solution from aluminum nitrate and aluminum sulfate according to a molar ratio of 3: 1, mixing the composite aluminum salt solution with a 1.5 mol / L ammonium carbonate-urea solution according to a volume ratio of 1: 1.5, and stirring to obtain a mixture A; then aging for 3 hours under a water bath condition of 80 + / -1 DEG C; s2, transferring a product obtained in the step S1 into a magnetically stirred high-pressure reaction kettle, reacting for 8 hours at the temperature of 180 + / -2 DEG C, and performing tubular centrifugation after the reaction is finished; according to the invention, through molecular bridging of the silane coupling agent and hierarchical assembly of carboxyl-terminated polyethyleneimine, a chemically bonded amino-carboxyl synergistic active center is formed on the surface of alumina, so that the chemical adsorption selectivity to CO2 is remarkably enhanced, and meanwhile, the problem that active components are easy to fall off in a traditional physical impregnation method is avoided.

The present application relates to a positive electrode active material, a method of preparing the positive electrode active material, and a rechargeable lithium battery including the positive electrode active material, the method comprising adding lithium hydroxide, nickel sulfate, cobalt sulfate, and ammonium carbonate to an aqueous solvent and mixing them to prepare a raw material mixture, wet-pulverizing the raw material mixture, the pulverized raw material mixture is spray-dried to obtain a positive electrode active material precursor mixture, and the positive electrode active material precursor mixture is heat-treated to obtain a positive electrode active material that is in the form of a single particle and includes a lithium nickel cobalt-based composite oxide.

The present application relates to a positive electrode material and its preparation method and application. The preparation method of the positive electrode material of the present application comprises the following steps: providing a metal salt solution, the metal salt solution comprising Ni 2+ 、Co 2+ 、Mn 2+ and Al 3+ A precipitant solution comprising lactic acid and ammonium carbonate is dropwise added to a metal salt solution to obtain a lactate precursor; and the lactate precursor and a lithium source are co-sintered. The method for preparing the cathode material of the present application enables precise control of the molar ratio of each element of nickel, cobalt, manganese, and aluminum to produce a cathode material having a desired chemical composition.

To prevent the formation of precipitates even if bicarbonate ions are contained in water.SOLUTION: A method for producing culture solution includes: a first step involving the nitrification of water containing bicarbonate ions and ammonium carbonate, leading to the conversion of ammonia nitrogen in the water into nitrate nitrogen and the conversion of bicarbonate ions into carbon dioxide; and a second step involving the addition of a fertilizer component containing at least one element selected from nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, boron, iron, manganese, zinc, molybdenum, nickel, and copper to the water processed in the first step.SELECTED DRAWING: Figure 1

The invention discloses a prime coat copper foil for improving stripping and cycle performance of a negative pole piece and a preparation method of the prime coat copper foil, and relates to the technical field of current collectors. The preparation method comprises the following steps: adding magnesium lithium silicate and ammonium carbonate into prime coating slurry, and then coating a copper foil with the prime coating slurry to obtain a prime-coated copper foil; after surface carboxyl of magnesium lithium silicate and oxygen-containing groups of polyacrylic acid are compounded, a large number of high-strength hydrogen bonds are formed, and when a negative electrode generates huge expansion stress in the circulation process, a hydrogen bond network between magnesium lithium silicate nanosheets and a polymer is broken, absorbs energy and buffers the structural change of an active material, so that the circulation performance of a battery end is improved; ammonium carbonate is heated and decomposed into NH3 and CO2, gas escapes and leaves nanoscale pores in the coating, on one hand, the gas can generate a stronger anchoring effect with a negative electrode active material to improve the stripping force of a pole piece, and on the other hand, the pores can serve as buffer pores to inhibit volume expansion of silicon particles during lithium intercalation and improve the cycle performance.

The invention provides a preparation method of an ammonia zinc carbonate crystal, and belongs to the technical field of abnormal mechanical materials, a solvent, zinc acetate and urea are subjected to a solvothermal reaction, cooling and separation are performed after the reaction is finished, and the ammonia zinc carbonate crystal is obtained.The invention provides an efficient, controllable and low-cost ammonia zinc carbonate single crystal synthesis route. A solvothermal method of a specific mixed solvent is adopted, urea controllable hydrolysis is utilized, growth of crystals of a specific spiral chain structure is achieved under the mild condition, stable, reversible and linear negative linear compression (NLC) behaviors are shown in the wide pressure range of 0-5 GPa, the key technical bottlenecks that an existing NLC material is narrow in pressure range and responds to nonlinearity are solved, and the preparation method is suitable for industrial production. An ideal solid molecular spring material is provided for high-pressure precision sensing and driving; the method is simple in process and good in repeatability, and a reliable and high-quality material source is provided for subsequent research and application.

The invention discloses a method for preparing battery-grade lithium carbonate based on a continuous flow coupling micro-reaction system. The method adopts an ammonia process path and comprises the following steps: firstly, introducing carbon dioxide into a micro-channel reactor to react with ammonia water to generate an ammonium carbonate solution; and continuously injecting the ammonium carbonate solution and the lithium chloride solution into an autonomously designed continuous flow dynamic microreactor. The continuous flow dynamic micro-reactor effectively crushes separated solid particles through shearing force generated by high-speed stirring inside, the problem that a traditional micro-reactor is easy to block is solved, and long-term stable continuous operation of a solid-containing system is realized. The particle size distribution and the impurity content of lithium carbonate can be accurately controlled by adjusting the reaction temperature, the stirring speed, the anti-solvent proportion and the raw material ratio. The purity of the prepared lithium carbonate is higher than 99.5 wt%, sodium ion pollution is avoided, and the method has the advantages of being efficient, high in automation degree, environmentally friendly and the like and has remarkable industrial application prospects.

This invention discloses an amino acid-hydrated zirconium oxide hybrid material, its preparation method, and its application, belonging to the field of water treatment. The specific preparation method of this hybrid material is as follows: amino acids are dissolved in deionized water, and a zirconium ammonium carbonate solution is added dropwise while stirring at room temperature to obtain a transparent mixed solution; the transparent mixed solution is dried at a constant temperature to obtain a white solid, which is then soaked, washed, and filtered to obtain a white precipitate; the white precipitate is dried at a constant temperature to obtain the product. The Arg-HZO prepared by this invention exhibits adsorption capacities for Cr(VI) and phosphate approximately 14 and 12 times that of blank HZO, respectively, while the Lys-HZO also achieves adsorption capacities for Cr(VI) and phosphate approximately 15 and 10 times that of blank HZO. Even in the presence of competing ions in the solution, Arg-HZO and Lys-HZO still demonstrate excellent adsorption capacity for Cr(VI) and phosphate, exhibiting good anti-interference capabilities. The Arg-HZO and Lys-HZO prepared in this invention have the advantages of being environmentally friendly, highly efficient, having good selectivity for Cr(VI) and phosphate, and having high mechanical stability. They are promising adsorbents for removing Cr(VI) and phosphate from wastewater.

The invention discloses a method for recovery and resource utilization of valuable metals in electrolytic manganese chemical combination waste residues, and relates to the technical field of metal waste recovery and utilization. The method comprises the following steps: collecting waste residues, coarsely crushing the waste residues by a jaw crusher, finely crushing the waste residues to 20-50 meshes by a ball mill, magnetically separating magnetic valuable metals, and screening to remove impurities to obtain pretreated waste residues; adding 10-15% dilute sulphuric acid and a composite additive into the pretreated waste residues according to the liquid-solid ratio of 3: 1-5: 1, leaching at 80-95 DEG C for 2-4 hours, and stopping leaching after the concentration of manganese ions is stable; filtering the leached mixture, carrying out extraction and reverse extraction on the leachate to obtain a manganese sulfate solution, and adding ammonium carbonate to obtain a manganese carbonate product; washing and dehydrating the leaching residues, mixing with cement and river sand, and curing to obtain a building material; acid-containing tail gas is subjected to spraying and activated carbon adsorption treatment, waste water is partially circulated after being neutralized, flocculated and filtered, and the rest is discharged after reaching the standard. According to the method, the valuable metal recovery and resource comprehensive utilization efficiency is improved, leaching residue recycling is achieved, it is guaranteed that tail gas and waste water reach the standard, fresh water consumption is reduced, and green and sustainable development of the electrolytic manganese industry is promoted.

The invention relates to the technical field of mural manufacturing, and discloses a manufacturing process of an improved draining powder gilding mural, which comprises the following steps: preparing a substrate, mixing modified draining powder base stock paste and a crosslinking activating solution to prepare paste for construction, extruding three-dimensional lines, standing and curing, and gilding for protection. The modified draining powder base stock paste is prepared from silane modified lithopone, a polyvinyl acetate emulsion, a golden styrene-acrylate copolymer emulsion and hydroxypropyl methyl cellulose; the crosslinking activating solution is prepared from ammonium zirconium carbonate, 2-amino-2-methyl-1-propanol and a solvent. According to the invention, the rheological stability is maintained in the mixing period by utilizing a volatile alkali regulated zirconium latent crosslinking mechanism, and the crosslinking reaction is triggered along with amine volatilization after extrusion. According to the process, the problems of drying shrinkage cracking, sagging deformation and poor water resistance of a traditional draining powder line are effectively solved, and the shape maintaining property, hardness and substrate adhesive force of the line are improved.

The application relates to the technical field of inorganic porous materials, and particularly discloses a preparation method of pseudo-boehmite for chloromethane. The preparation method comprises the following steps: S1: adding a sodium-free aluminum salt, zirconium nitrate pentahydrate and tetrabutyl titanate into a mixed solvent, adding a complexing agent, then adding nano-boehmite, uniformly mixing, adjusting the pH value to 7.5-8.0, increasing the temperature to 25-35 DEG C, mixing, adjusting the pH value to 5.5-6.0, mixing, and obtaining a uniform sol; S2: mixing urea and ammonium bicarbonate in water, adding zirconium ammonium carbonate, and obtaining a mixed solution B; S3: adding the mixed solution B into the uniform sol, uniformly mixing, performing gradient temperature reaction, performing solid-liquid separation, washing, drying, and obtaining the pseudo-boehmite for chloromethane. The pseudo-boehmite for chloromethane prepared by the application has extremely low sodium content, high specific surface area and excellent thermal stability.

The invention discloses a method for removing copper particles in a positive electrode material of a lithium ion battery based on ammonium-oxygen synergy. The method comprises the following steps: mixing a nickel-cobalt-manganese ternary positive electrode material of a retired lithium ion battery containing the copper particles with ammonium carbonate; oxygen-containing gas is introduced for a leaching reaction, and copper particles in the positive electrode material are selectively complexed to form soluble complex tetraamminecopper ions; and carrying out solid-liquid separation to obtain the positive electrode material without the copper particles. According to the invention, the self-buffering capability of ammonium carbonate in a specific pH range is utilized, tetraamminecopper ions are formed based on the synergistic effect of ammonium and oxygen, and valuable metal elements such as nickel, cobalt, manganese and the like do not form soluble ammonia complexes under the pH condition and are precipitated in the form of carbonate, oxide or hydroxide, so that efficient separation of copper and the positive electrode material is realized; the method has the advantages of high copper removal efficiency, good selectivity, pH self-buffering, environmental friendliness and the like.

The present invention provides a hair treatment agent that can suppress the decrease in hair strength (firmness, resilience, resistance to breakage, and combability) caused by dyeing and bleaching treatments, while simultaneously suppressing the generation of unpleasant odors in the hair caused by these treatments. [Solution] A hair treatment agent used in mixture with a second agent containing hydrogen peroxide, comprising a carboxylic acid or a salt thereof and an alkaline agent, wherein the carboxylic acid is tartaric acid, the content of the carboxylic acid or salt thereof is 0.001 to 5% by mass, the alkaline agent is at least one selected from the group consisting of ammonia, diethanolamine, and aminomethylpropanol, and further contains a pH buffer, the pH buffer is a carbonate selected from the group consisting of ammonium bicarbonate, ammonium carbonate, sodium bicarbonate, sodium carbonate, potassium bicarbonate, and potassium carbonate, and the pH is 8.5 to 11.5.

The invention discloses a method for efficiently recycling lithium and manganese elements in a lithium manganese iron phosphate battery material, which comprises the following detailed process flows: discharging a waste lithium manganese iron phosphate battery, disassembling and sorting to obtain lithium manganese iron phosphate positive electrode powder, adding ammonium sulfate into the positive electrode powder, uniformly mixing, and roasting under an oxidation condition to obtain a roasted material; performing water leaching on the roasted material to selectively leach out lithium and manganese, adding ammonium carbonate into a manganese-containing lithium sulfate solution to generate manganese carbonate precipitate, and re-dissolving the manganese carbonate to obtain refined manganese carbonate which is used as a manganese source for preparing lithium iron manganese phosphate; the filtrate after filtration is a lithium sulfate solution, the solution is neutralized with ammonia water to remove impurities to obtain a pure lithium sulfate solution, ammonium carbonate is added into the lithium sulfate solution to prepare a lithium carbonate finished product, and the prepared lithium carbonate mother liquor is subjected to evaporative crystallization to prepare an ammonium sulfate byproduct.

The invention relates to a positive electrode material and a preparation method and application thereof. The preparation method of the positive electrode material comprises the following steps: providing a metal salt solution which comprises Ni < 2 + >, Co < 2 + >, Mn < 2 + > and Al < 3 + >; a precipitant solution is dropwise added into the metal salt solution, the precipitant solution comprises lactic acid and ammonium carbonate, and a lactate precursor is obtained; and co-sintering the lactate precursor and a lithium source. According to the preparation method of the positive electrode material, the molar ratio of nickel, cobalt, manganese and aluminum elements can be accurately controlled so as to prepare the positive electrode material with the chemical composition meeting the requirement.

The invention discloses a culture medium for culturing anaerobic ammonium oxidation bacteria sludge as well as a preparation method and application of the culture medium. The culture medium comprises the following components: 0.45 g / L to 0.75 g / L of ammonium carbonate, 0.5 g / L to 1.0 g / L of calcium nitrite, 0.1 g / L to 0.5 g / L of magnesium sulfate, 0.5 g / L to 3 g / L of dipotassium phosphate, 0.1 g / L to 0.5 g / L of anhydrous sodium acetate, 0.5 mL / L to 2 mL / L of microelement mother liquor and 0.5 mL / L to 2 mL / L of a growth promoting agent. The culture medium provided by the invention can significantly shorten the growth time of anaerobic ammonium oxidation bacteria, and provides a basis for rapid and efficient production of anaerobic ammonium oxidation strain mud.

The invention belongs to the technical field of waste battery recovery, and particularly relates to a method for preparing lithium carbonate by leaching and recovering positive and negative electrode powder of a waste LFP battery and application of the method. The method comprises the following steps: S1, reacting lithium-containing leachate with sodium fluoride to precipitate lithium in the form of lithium fluoride, and carrying out solid-liquid separation to obtain a lithium fluoride filter cake; s2, washing the lithium fluoride filter cake, and filtering to obtain high-purity lithium fluoride; s3, enabling the high-purity lithium fluoride to react with the ammonium carbonate solution to generate lithium carbonate and ammonium fluoride, and filtering to obtain a lithium carbonate crude product and ammonium fluoride-containing filtrate; s4, washing and drying the lithium carbonate crude product to obtain battery-grade lithium carbonate; s5, lime powder is added into the ammonium fluoride-containing filtrate obtained in the S3 to react to generate calcium fluoride precipitate, and a calcium fluoride product is obtained after filtering; s6, introducing carbon dioxide into the filtrate after the reaction in the step S5 to generate an ammonium carbonate solution, and circulating the ammonium carbonate solution to the step S3 for reuse; and S7, evaporating and crystallizing the sodium sulfate wastewater subjected to lithium precipitation in the step S1 to obtain anhydrous sodium sulphate, and recovering distilled water to a leaching section acid preparation process.

The invention discloses a catalyst for aldehyde liquid phase hydrogenation and a preparation method thereof, relates to the technical field of aldehyde liquid phase hydrogenation catalysts, and aims to solve the technical problems that an aldehyde liquid phase hydrogenation catalyst in the prior art cannot give consideration to both activity and selectivity, and the stability of the catalyst is poor. The preparation method of the catalyst comprises the following steps: (1) heating deionized water, adding aluminum salt and ammonium tungstate, continuously stirring at a constant temperature, slowly adding an ammonium carbonate solution, controlling the pH value to be 8-9, continuously stirring, aging, washing and drying to obtain a precursor; (2) uniformly mixing the precursor with a phosphoric acid solution containing polydimethylpolysiloxane, performing hydrothermal treatment, drying, roasting, grinding and screening to obtain a carrier; and (3) preparing nickel salt, lithium salt, manganese salt and aluminum salt into steeping liquor, adding triethyl phosphate into the steeping liquor, and washing, drying and roasting after steeping to obtain the catalyst. The catalyst prepared by the method is mainly used in an octenal liquid phase hydrogenation catalytic reaction process.

The application provides a copper plate paper and cigarette paper thereof, and the copper plate paper comprises a base paper, a first coating layer, a second coating layer and a third coating layer; the base paper comprises a front surface and a back surface arranged oppositely; the first coating layer is coated on the front surface of the base paper; the second coating layer is coated on the back surface of the base paper, wherein the material of the second coating layer is selected from at least two or more combinations of sodium carboxymethyl starch, carboxymethyl cellulose, polyvinyl alcohol, AZC type (zirconium ammonium carbonate) adhesive and multi-active functional group high cross-linking type water resistance agent; and the third coating layer is coated on the second coating layer. The copper plate paper provided by the embodiment of the application can maximally inhibit the problem of inaccurate printing or gold blocking caused by shape stability of non-fluorescent cigarette paper single copper during printing and post-processing. The non-fluorescent cigarette paper single copper can fully meet the requirements of the current cigarette packaging market, increasingly exquisite and complex printing and subsequent processing quality.

The invention discloses a preparation method of a self-assembled high-performance spherical lithium cobalt oxide positive electrode material of a lithium ion battery. The preparation method comprises the following steps: (1) complexing and mixing: mixing a cobalt source and complexing agent raw material powder; the cobalt source is cobalt sulfate heptahydrate, cobalt nitrate hexahydrate or cobalt chloride; the complexing agent is one or more of ammonia water, ammonium carbonate, urea, ethylenediamine tetraacetic acid, citric acid monohydrate or anhydrous oxalic acid; (2) a precipitation reaction and aging step: adding a precipitator into the mixture obtained in the step (1); the precipitant is sodium carbonate, sodium hydroxide, sodium bicarbonate, potassium carbonate, potassium hydroxide or a combination thereof; and (3) a post-treatment step: washing the initial precursor with deionized water, filtering, drying to obtain cobalt precursor powder, mixing the obtained cobalt precursor with a lithium source, and roasting to obtain the lithium cobalt oxide positive electrode material. According to the invention, the raw material cost is reduced, the operation steps are simplified, the product yield is improved, and the low-cost and high-performance lithium cobalt oxide positive electrode material with the spherical structure can be prepared.

The invention provides a catalytic denitration agent and a preparation method thereof. The catalytic denitration agent comprises the following components: a reducing base material: 30-60 parts of urea, 10-25 parts of ammonium carbamate, 5-15 parts of ammonium carbonate and 5-15 parts of ammonium bicarbonate; the phase change catalysis component is prepared from the following components in parts by weight: 2 to 6 parts of ammonium dihydrogen phosphate, 1 to 5 parts of diammonium hydrogen phosphate, 0.05 to 0.5 part of molybdate, 0.1 to 0.8 part of tungstate, 0.1 to 0.8 part of organic acid metal salt and 1 to 8 parts of modified zeolite; functional auxiliaries: 0.2 to 1.0 part of a dispersing agent, 0.1 to 0.6 part of a surfactant and 0.05 to 0.2 part of a corrosion inhibitor. The polymer catalytic denitration agent prepared by constructing a multi-component compound catalytic system realizes the unification of wide-temperature efficient denitration, low corrosion, low ammonia escape and high operation stability while remarkably reducing the phase change temperature and energy consumption, and effectively solves the multiple problems of harsh reaction conditions, unstable efficiency, equipment corrosion and the like in the prior art.

The invention discloses a preparation method of nano manganese carbonate, and relates to the technical field of preparation of nano manganese carbonate. The method comprises the following steps: preparing a manganese source continuous phase, wherein the manganese source continuous phase is a Mn (OH) 2 suspension or a solution containing Mn < 2 + >; a manganese source continuous phase and CO2 gas are communicated with the microreactor, or the manganese source continuous phase and a carbonate dispersed phase are communicated with the microreactor, and the carbonate dispersed phase is ammonium carbonate or ammonium bicarbonate; reacting the manganese source continuous phase with CO2 gas or carbonate dispersed phase in the microreactor; returning the reacted mixed solution to the manganese source continuous phase, and enabling the reacted mixed solution to enter the micro-flow reactor again for circular reaction; and carrying out vacuum drying on the mixed solution obtained by the circular reaction to obtain the nano manganese carbonate particles. The method provided by the invention can be used for preparing manganese carbonate particles with the particle size of 20-500nm, and the particles can be spherical or microcube-shaped.