92 results about "Ammonium carbonate" patented technology

The invention discloses a synthesis method of a hydrazine dicarboxylate modified cerium dioxide abrasive, and belongs to the technical field of precise polishing materials. The method comprises the following steps: taking cerous nitrate as a raw material, and preparing a cerous carbonate precursor through an ammonium carbonate precipitation reaction; and grinding and calcining the obtained precursor and hydrazine dicarboxylate to obtain the CeO2 grinding material with the surface rich in oxygen vacancies. And Ce < 4 + > can be partially reduced into Ce < 3 + > by reducing fragments generated by decomposition of the hydrazine dicarboxylate in the calcining process, so that an oxygen vacancy structure is formed through induction, and the chemical activity and the reaction rate of the abrasive are improved. The obtained grinding material shows excellent performance in chemical mechanical polishing (CMP) of K9 glass, the material removal rate (MRR) is increased by about 3.6 times compared with that of unmodified CeO2, the surface roughness (Ra) is reduced to about 0.16 nm or below, and grinding material particles are good in dispersity and less in agglomeration. The used hydrazine dicarboxylate is stable, low in toxicity and mild in reaction, and the particle size can be prevented from excessively growing while the high oxygen vacancy concentration is kept.

The invention discloses a preparation method of CoWO (cobalt tungsten oxide) modified NbOp-n heterojunction NbO5 / CoWO photocatalyst powder. The preparation method comprises the following steps: dissolving cobalt salt and tungsten salt in deionized water, stirring and mixing, carrying out hydrothermal reaction in an autoclave, washing and drying to obtain CoWO powder; the preparation method comprises the following steps: dissolving niobium oxalate and ammonium carbonate in deionized water, adding CoWO powder, carrying out a hydrothermal reaction in an autoclave, and carrying out washing and drying treatment to prepare NbO / CoWO photocatalyst powder. According to the method, the hydrothermal reaction temperature is regulated and controlled, and the mass ratio of raw materials is optimized, so that the catalyst forms a p-n heterojunction structure of NbOmicron flower loaded CoWOnano particles. The prepared catalyst has high norfloxacin wastewater degradation efficiency under visible light irradiation, has the advantages of simple preparation process, low reagent cost, high catalytic activity and good structural stability, and can be effectively applied to purification treatment of antibiotic polluted water.

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 green process method for extracting alkali metal from composite ore, and relates to the field of metal extraction.The green process method comprises the following steps that S1, aluminosilicate composite ore containing alkali metal and ammonium carbonate are mixed and roasted, and activated clinker is obtained; s2, mixing the activated clinker with an ammonium citrate solution, carrying out a leaching reaction at 80-95 DEG C, and carrying out solid-liquid separation after the reaction to obtain a leaching solution and leaching residues; according to the green process method for extracting the alkali metal from the composite ore, through systematic coupling of a low-temperature ammonium carbonate activation-ammonium citrate complexing leaching-manganese system / ammonium phosphomolybdate specific adsorption-bipolar membrane electrodialysis closed-loop regeneration technology chain, a synergistic interaction effect is formed; the activation step significantly improves the leaching efficiency of the subsequent mild leaching agent.

The invention discloses a method for preparing nano calcium carbonate by using fluorite leachate, and belongs to the technical field of hydrometallurgy. According to the method, metallurgical-grade fluorite is subjected to magnetic separation iron removal and hydrochloric acid solution leaching, high-purity fluorite and a calcium chloride solution are obtained, and meanwhile carbon dioxide gas is generated; removing impurities from the calcium chloride solution, reacting the calcium chloride solution with an ammonium carbonate solution to form a calcium carbonate emulsion, aging the calcium carbonate emulsion, filtering and separating to obtain nano calcium carbonate and filtrate; heating the filtrate to generate hydrogen chloride and ammonia gas, absorbing hydrogen chloride by water to form a hydrochloric acid solution, and recycling; ammonia gas and carbon dioxide are absorbed by water to generate an ammonium carbonate solution for recycling. According to the method, the metallurgical-grade fluorite is purified, meanwhile, the nano calcium carbonate product with the high additional value is prepared through the fluorite leaching solution, cyclic utilization of hydrochloric acid, ammonium carbonate and the like can be achieved, and the method has the advantages of being environmentally friendly, capable of saving energy, reducing consumption, simple, efficient and the like and is beneficial to large-scale application and popularization.

The application discloses a catalyst for preparing malononitrile, a preparation method of the catalyst and a method for preparing malononitrile by using the catalyst. The catalyst is a solid catalyst, which is an acidic catalyst loaded with rare earth metal oxide. The method for preparing malononitrile is that cyanoacetic acid or cyanoacetate or cyanoacetamide and an ammonia source are subjected to ammoniation dehydration reaction in a continuous reactor to prepare malononitrile according to a certain molar ratio. Then, vacuum distillation (20 torr-25 torr) is carried out, and a fraction collected at 110 DEG C-120 DEG C is malononitrile product. The ammonia source can be ammonia gas, ammonia water, ammonium carbonate or urea. The method for preparing malononitrile can reduce production cost, improve production safety, reduce the discharge amount of three wastes in the preparation of malononitrile by using an existing process, and improve product quality, and is a sustainable and green synthesis route.

The invention provides a silica gel carrier and a preparation method thereof. The preparation method comprises the following steps: providing a first silicate aqueous solution with the pH value of 9-10 as a base solution; mixing the second silicate aqueous solution, inorganic acid and the base solution, and aging at 70-80 DEG C to obtain a first mixed solution with the pH value of 9-13; mixing the first mixed solution, an alkaline substance and organic alcohol, adjusting the pH value to 10-12, and carrying out a first reaction to obtain a second mixed solution; mixing the second mixed solution, an alkaline substance and organic alcohol, adjusting the pH value to 11-12, and carrying out a second reaction to obtain a hydrogel system; mixing the hydrogel system with inorganic acid, and adjusting the pH value to 5-6; performing post-treatment to obtain a silica gel carrier; wherein the alkaline substance comprises one or a combination of more than two of ammonia water, ammonium carbonate and ammonium bicarbonate. The silica gel carrier provided by the invention has excellent pore structure and particle size distribution.

This application relates to the field of materials, and provides a method for preparing all-starch foamed tableware. By weight, the all-starch foamed tableware comprises the following components: 85-92 parts of composite modified starch, 23-38 parts of plant cellulose, 1-2 parts of foaming agent, 3.5-7 parts of nucleating agent, 1-1.5 parts of plasticizer, and 3-6 parts of crosslinking agent; wherein the foaming agent includes at least one of sodium bicarbonate, ammonium bicarbonate, and ammonium carbonate; the nucleating agent includes at least one of talc, calcium carbonate, montmorillonite, diatomaceous earth, straw powder, chitosan, and cyclodextrin; the plasticizer includes at least one of glycerol, sorbitol, ethanol, and water; and the crosslinking agent includes at least one of citric acid, malic acid, tartaric acid, maleic acid, succinic acid, and adipic acid. This application not only comprehensively improves the water resistance, heat resistance, mechanical strength, and cell uniformity of the all-starch foamed tableware, but also ensures that the product meets usage requirements.

The invention discloses a method for comprehensively recycling yellow phosphorus slag of an electric furnace, and belongs to the technical field of chemical engineering. Comprising the following steps: grinding slag, adding nitric acid in proportion, reacting dicalcium silicate in the slag with nitric acid to generate calcium nitrate and silicon slag, and reacting calcium nitrate with ammonium carbonate to prepare an ammonium nitrate product and a calcium carbonate product; and washing and separating the silicon slag to obtain orthosilicic acid, returning one part of orthosilicic acid to be re-blended with the phosphate ore to enter the furnace so as to recycle the slag, and calcining the rest part of orthosilicic acid to obtain a white carbon black product. The use amount of silica is reduced, mineral resources of silica are saved, and the use amount of silica produced from yellow phosphorus reaches self-balance.

The invention relates to the technical field of comprehensive utilization of vanadium titano-magnetite resources, in particular to a flotation combined reagent and a flotation method for vanadium titano-magnetite associated ultralow-grade cobalt-nickel ore. The flotation combined reagent comprises a copper ammonia compound activating agent composed of copper sulfate, ammonium carbonate and sodium citrate, a compound inhibitor composed of sodium humate, tannic acid and sodium tripolyphosphate, a main collecting agent butyl xanthate, an auxiliary collecting agent alkyl hydroxamic acid and a foaming agent diethylene glycol monobutyl ether. According to the method, a technical system of bulk flotation process-novel collaborative reagent system is constructed, so that the technical problem of recycling associated ultralow-grade cobalt and nickel resources in the vanadium titano-magnetite iron separation tailings is successfully solved, the problem of low separation efficiency of ultralow-grade minerals is effectively solved, a complete and efficient technical scheme is formed, and the method is suitable for industrial production. And an innovative technical path is provided for comprehensive recovery of associated cobalt and nickel resources of the vanadium titano-magnetite.

The invention provides a metallocene catalyst and a preparation method and application thereof. The method comprises the following steps: providing a first silicate aqueous solution with the pH value of 9-10 as a base solution; mixing the second silicate aqueous solution, inorganic acid and the base solution, and aging at 70-80 DEG C to obtain a first mixed solution; mixing and reacting the first mixed solution, an alkaline substance and organic alcohol to obtain a second mixed solution; mixing and reacting the second mixed solution, an alkaline substance and organic alcohol to obtain a hydrogel system; mixing the hydrogel system with inorganic acid to obtain acidified gel; performing first post-treatment to obtain a silica gel carrier; carrying out thermal activation on the silica gel carrier, and mixing and reacting with an aluminum alkyl solution to obtain MAO modified silica gel; and mixing the MAO modified silica gel with a metallocene compound, reacting, and carrying out second post-treatment to obtain the metallocene catalyst, wherein the alkaline substance comprises one or a combination of more than two of ammonia water, ammonium carbonate and ammonium bicarbonate. The metallocene catalyst has good catalytic activity.

This invention discloses a method for treating wastewater containing magnesium sulfate and ammonium sulfate. The method includes: evaporating and concentrating the wastewater containing magnesium sulfate and ammonium sulfate, then cooling and crystallizing it, followed by solid-liquid separation to obtain magnesium ammonium sulfate crystals and a mother liquor containing ammonium sulfate; reacting the magnesium ammonium sulfate crystals with an ammonium salt that can generate carbonate ions and water to undergo a precipitation reaction, followed by solid-liquid separation to obtain magnesium carbonate product and a mixed solution containing ammonium sulfate and ammonium carbonate; stripping the mixed solution containing ammonium sulfate and ammonium carbonate to obtain stripped water containing ammonium sulfate and an ammonium carbonate fraction; both the mother liquor containing ammonium sulfate and the stripped water containing ammonium sulfate can be evaporated and crystallized to obtain ammonium sulfate product; the ammonium carbonate fraction can be recycled for precipitation reactions. This invention can effectively separate magnesium and ammonium from wastewater, and the separated magnesium carbonate and ammonium sulfate products have high purity and good quality, and can be used directly as products.

The invention discloses an alumina carrier with a special morphology and a preparation method thereof. The preparation method comprises the following steps: (1) preparing an ammonium bicarbonate solution and / or an ammonium carbonate solution as a hydrothermal medium; (2) uniformly mixing pseudo-boehmite with a hydrothermal medium, and sealing; (3) putting the sealed material into an ultrasonic reactor for ultrasonic pretreatment; (4) carrying out hydrothermal treatment on the pretreated material, and filtering and drying the material subjected to hydrothermal treatment to obtain fibrous ammonium aluminum carbonate powder; (5) uniformly mixing the fibrous ammonium aluminum carbonate powder and a forming aid, and then adding a solution prepared from a peptizing agent and water for mixing and kneading; and (6) extruding, drying and roasting the material to obtain the fibrous alumina carrier. According to the preparation method disclosed by the invention, distribution of active metals is promoted by improving the surface morphology of the carrier, so that the activity of the catalyst is improved.

Systems and processes for producing ammonia products and calcium carbonate products, the latter containing sequestered carbon dioxide, from an effluent derived from one or more organic feedstocks. Solids are removed from an organic feedstock that contains a nitrogen compound to produce an organic liquid effluent that contains ammonium and / or ammonia. Ammonia is stripped and concentrated from the organic liquid effluent to produce a gaseous mixture that contains ammonia and carbon dioxide, and the gaseous mixture is cooled to produce a condensed aqueous ammoniacal nitrogen solution of aqueous ammonia, ammonium bicarbonate, and / or ammonium carbonate. The condensed aqueous ammoniacal nitrogen solution is then contacted with a stabilizing agent to cause a reaction therebetween to produce at least a stabilized ammoniacal nitrogen product and calcium carbonate in which carbon dioxide captured in the ammonium bicarbonate and / or the ammonium carbonate is sequestered.

The invention discloses a method for preparing vanadium pentoxide from vanadium slag and vanadium pentoxide. The method comprises the following steps that the vanadium slag is subjected to roasting, clinker leaching and purification in sequence, and purified liquid is obtained; extracting the purified liquid by using a CO3 < 2-> and / or HCO3 <-> type extraction agent to obtain a vanadium-containing organic phase; the vanadium-containing organic phase is subjected to reverse extraction through a reverse extraction agent, and vanadium-containing reverse extraction liquid is obtained; adding ammonium salt into the vanadium-containing strip liquor, cooling and precipitating to obtain ammonium metavanadate; and calcining the ammonium metavanadate to obtain vanadium pentoxide. According to the scheme, the purification liquid is separated in an extraction mode to obtain the vanadium-containing organic phase, meanwhile, the vanadium-containing organic phase is subjected to reverse extraction of vanadium through the mixed solution of the sodium carbonate, the ammonium carbonate and the ammonia water, the stability of the vanadium-containing reverse extraction liquid is improved through introduction of the sodium carbonate, and the problem that when the vanadium is subjected to reverse extraction through the mixed solution of the ammonium salt and the ammonia water is solved. The problems of device wall scabbing, pipeline blockage and the like caused by crystallization and separation of ammonium metavanadate are solved.

The invention provides a method for preparing a catalyst from solid waste, the catalyst and application of the catalyst, and relates to the technical field of catalysts. The method for preparing the catalyst from the solid waste comprises the following steps: mixing solid waste containing alkaline metal oxide, active metal salt, ammonium carbonate and water, and carrying out ball milling to obtain a catalyst intermediate; and drying the catalyst intermediate, and roasting to obtain the catalyst. The catalyst is prepared by using the method for preparing the catalyst by using the solid waste. The catalyst is used for catalytic hydrogenation reaction. According to the method for preparing the catalyst from the solid waste, the solid waste resource serves as a carrier, the alkaline metal oxide rich in the solid waste resource can serve as an auxiliary agent to improve the reaction effect so as to solve the problems that the conversion rate and selectivity are low, the early-stage investment cost is low, the solid waste resource which cannot be utilized can be recycled, and low cost and high return are achieved; and environment-friendly continuous preparation is realized.

The application discloses a method for purifying vanadium oxide, which comprises the following steps: a, dissolving APV, V2O5 or red cake in ammonia water or ammonium carbonate or ammonium bicarbonate to obtain an AMV solution; b, performing crystallization separation on the AMV solution to obtain solid AMV and a first filtrate; if the impurity content in the solid AMV is qualified, vanadium oxide is prepared by calcination or reduction; if the impurity content in the solid AMV is unqualified, the step c is performed; c, heating and dissolving the solid AMV, adding an acidic solution to adjust the pH value to increase the dissolution amount of the solid AMV, cooling and adjusting the pH value when the vanadium concentration in the solution reaches a certain value to obtain a stable acidic vanadium solution, and filtering the acidic vanadium solution; d, heating and crystallizing the filtrate in the step c to obtain solid APV and a second filtrate; if the impurity content in the solid APV is qualified, vanadium oxide is prepared by calcination or reduction. The method is used for mutual conversion between APV and AMV, the impurities in the raw material are gradually removed in an acidic or weak alkaline environment, and the purity of the vanadium oxide is improved.

This invention relates to compositions, particularly aqueous compositions, comprising: (a) guanidine and / or at least one unsubstituted guanidine salt, and (b) one or more carbonate compounds selected from sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, ammonium bicarbonate, and ammonium carbonate. The compositions are characterized in that the weight ratio of component (a) to component (b) is in the range of 1:14 to 54:1, and in each case, the weight ratio is determined based on the content of guanidine and carbonate ions in the entire composition. The invention further relates to industrial products comprising the compositions of the invention, and the use of the compositions for stabilizing aqueous industrial products against microbial invasion.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a recycling method of coal chemical industry conversion high-ammonia-nitrogen wastewater, which comprises the following steps: S1, diluting the coal chemical industry conversion high-ammonia-nitrogen wastewater by at least one time to obtain diluted wastewater, and carrying out oxidation treatment to obtain first treatment liquid; s2, performing cold treatment on the first treatment liquid to obtain ammonium carbonate and a second treatment liquid; s3, performing carbonization treatment on the second treatment solution to obtain ammonium bicarbonate and a third treatment solution; and S4, carrying out ammonium sulfate treatment on the third treatment liquid to prepare ammonium sulfate. According to the recycling method of the high-ammonia-nitrogen wastewater provided by the embodiment of the invention, effective components in the wastewater are recycled step by step through a simple hierarchical recycling process, so that the treatment problem of the high-ammonia-nitrogen wastewater is effectively solved, the treatment cost of the wastewater is reduced, and the resource utilization of the wastewater is also realized.

This invention discloses a catalyst and method for the continuous synthesis of formamide from ammonium carbonate or ammonium bicarbonate, belonging to the field of chemical technology. The catalyst is a boron-nitrogen co-doped activated carbon supported palladium catalyst prepared by using a palladium precursor, boric acid, and nitrogen-doped activated carbon. The method uses ammonium carbonate solution or ammonium bicarbonate solution as raw material, and in a continuous flow reactor, the above-mentioned catalyst catalyzes the hydrogenation of ammonium carbonate or ammonium bicarbonate to synthesize formate. The formate is then dehydrated to obtain formamide. The catalyst of this invention has advantages such as high activity and high stability, and can efficiently and stably produce ammonium formate in a continuous flow reactor, which can then be further dehydrated to obtain formamide, thus providing a green, low-carbon, and safe method for the synthesis of formamide.

The invention belongs to the technical field of automobile coatings, and particularly relates to a wet-on-wet water-based automobile intermediate coating based on interface self-strengthening and multi-network cooperation as well as a preparation method and application of the wet-on-wet water-based automobile intermediate coating. The water-based paint is composed of the following components: a water-based main resin system, amino resin, an aqueous solution of ammonium zirconium carbonate, a polyethylene glycol-block-polycaprolactone-urea-based copolymer, a flash-dry wax emulsion, a volatile pH regulator, a solvent, an auxiliary agent, a water-based color paste and water. According to the intermediate coating disclosed by the invention, the temperature-sensitive characteristic of ammonium zirconium carbonate is utilized, an ionic cross-linked network is quickly formed during flash drying, the wet film strength is instantly improved, and the problems of bottom biting, color bleeding and the like are fundamentally prevented. Through the chemical crosslinking of the amino resin and the dynamic hydrogen bond network cooperation of the temperature-sensitive hydrogen bond enhancer, the paint film has high hardness, chemical resistance, excellent flexibility and excellent stone impact resistance at the same time. The flash-dry wax emulsion forms a net on the surface of a paint film, so that the scratch resistance is improved; and during baking, melting and interpenetrating with the upper and lower coatings to form a reinforced interface to lock the interlayer adhesive force.

The application discloses a method for rapidly preparing silicon-modified multi-level hole nano gamma-Al2O3, and specifically comprises the following steps: dissolving NaAlO2 in water to form a sodium metaaluminate solution; dissolving a precipitant in water to form a solution, and transferring the solution into a reaction kettle; adding a silicon source into the reaction kettle, wherein the adding amount of the silicon source is calculated according to the adding amount of SiO2; slowly adding the sodium metaaluminate solution into the reaction kettle, and adjusting the pH value of the obtained mixed solution to 9-11; adding a pore-expanding aid, and aging for 3-10 hours; after aging, performing solid-liquid separation, recycling the filtrate, sufficiently washing the powder with deionized water, and drying to obtain basic aluminum ammonium carbonate; and calcining the AACH in a muffle furnace at a temperature increasing rate of 2 DEG C / min to 300-500 DEG C to obtain silicon-modified nano gamma-Al2O3 powder. The nano gamma-Al2O3 prepared by the method can directly hydrothermally synthesize a silicon-modified precursor AACH in one step without other complex steps, has less impurities, and has high purity. The prepared nano gamma-Al2O3 has high specific surface area, large pore diameter and high pore volume.

Process for producing ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3) in an electrolyzer comprising an hydrogen depolarized anode, by feeding a base chamber of the electrolyzer with an aqueous solution comprising ammonium chloride (NH4Cl), sodium chloride (NaCl), dissolved carbon dioxide (CO2) and obtaining an outlet solution from the base chamber comprising ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3).

This invention discloses a high-entropy rare-earth silicate ceramic powder and its preparation method. A flocculent precipitate is obtained through in-situ chemical co-precipitation via both forward titration (adding ammonium carbonate solution to a precursor solution) and reverse titration (adding the precursor solution to an ammonium carbonate solution). This precipitate is then repeatedly washed, dried, and calcined at high temperature to prepare a monoclinic high-entropy silicate powder. This invention arbitrarily selects five trivalent lanthanide rare-earth elements with different ionic radii and dissolves them into the high-entropy rare-earth silicate lattice, thereby significantly increasing the configurational entropy and lattice distortion of the sample, enhancing the phase structure stability, and resulting in a resonant frequency temperature coefficient closer to 0 ppm / ℃. The bulk sample of the high-entropy rare-earth silicate ceramic powder, after pressing and sintering, has a relative permittivity of 9.82~10.31, which meets the requirements for microwave dielectric ceramics in millimeter-scale communication.

This invention provides an environmentally friendly method for preparing a carpacacininib intermediate, belonging to the field of pharmaceutical intermediate technology. The method discloses an oxidation reaction of N-Boc-4-hydroxypiperidine as the starting material, yielding compound 2 under the action of an oxidant and a buffer. Compound 2 is then reacted with a cyaniding reagent in the presence of ammonium carbonate via a Bucherer-Bergs reaction to obtain compound 3. Compound 3 undergoes hydrolysis in an alkaline system at 80–110°C to obtain compound 4. Compound 4 is then reacted with di-tert-butyl dicarbonate to perform a Boc protecting group reaction, yielding the carpacacininib intermediate. This invention provides a method suitable for green and environmentally friendly industrial production to obtain the carpacacininib intermediate. This method avoids the use of highly toxic substances and precious metal catalysts, and achieves continuous reaction, thereby improving reaction efficiency and stability and reducing the formation of by-products. The overall yield of the four-step reaction can reach over 70%, and the product purity can reach over 99.4%.

This invention provides a method for preparing nano-calcium carbonate, comprising the following cyclical processes: (1) pretreatment of dry carbide slag raw materials; (2) leaching Ca from the dry carbide slag with ammonium chloride solution. 2+ And perform solid-liquid separation to obtain a high-purity calcium chloride solution and ammonia. (3) Use the ammonia in (2) to absorb low-concentration CO2 flue gas to obtain a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) Mix the mixed solution of ammonium carbonate and ammonium bicarbonate obtained in (3) with the calcium chloride solution obtained in (2) to obtain calcium carbonate precipitate and ammonium chloride solution; (5) Use the ammonium chloride solution obtained in (4) to evaporate and concentrate, and return to step (2) to complete the entire cycle process. This method uses the escaped ammonia produced by the traditional ammonium chloride leaching CO2 to dry carbide slag to absorb flue gas to prepare ammonium carbonate and ammonium bicarbonate. It not only achieves efficient conversion of low-concentration flue gas CO2, significantly reduces conversion costs, and improves economic feasibility, but also uses the high-concentration ammonium carbonate of the conversion product to produce nano-CaCO3, which has significant environmental and economic benefits.

The invention relates to the technical field of water-based building coatings, and discloses a high-adhesion putty-free micro pottery stone art paint and a preparation process thereof, and the art paint is prepared from deionized water, multifunctional amino alcohol, polyether modified phosphate, calcined ceramic microbeads, a carboxyl acrylate emulsion, nano silica sol, an ammonium zirconium carbonate solution and other raw materials. According to the invention, a pH responsive latent curing system is constructed by utilizing the coordination shielding effect of multifunctional amino alcohol and zirconium ions, so that the contradiction between the storage stability and rapid curing of a single-component coating is solved; through the physical permeation of the nano silica sol and the chemical bonding of phosphate-zirconium-calcium ions, the super-strong anchoring of the coating on a cement base material is realized; and in cooperation with an interpenetrating network structure formed by ceramic microbeads with specific gradation, internal stress is effectively dissipated. The product disclosed by the invention can be directly and thickly coated on a cement base surface without cracking, has excellent water resistance, scrubbing resistance and high simulation texture, is simplified in process, and is environment-friendly and efficient.

The invention relates to the technical field of pharmaceutical preparations, in particular to a methylprednisolone pulse micro-tablet and a preparation method thereof. The methylprednisolone pulse microtablet comprises a quick release tablet core and a coating layer, the quick-release tablet core comprises methylprednisolone, a filler, an antistatic agent A, an antistatic agent B, an adhesive and a lubricant; the coating layer comprises a coating material and a plasticizer; wherein the antistatic agent A is selected from at least one of a combination of organic acid and bicarbonate or ammonium carbonate; the antistatic agent B is selected from at least one of polyoxyethylene, carbomer, high-expansion type pregelatinized starch, carboxymethyl starch sodium, low-substituted hydroxypropyl cellulose, croscarmellose sodium and crospovidone. The antistatic agent A and the antistatic agent B have a synergistic effect, so that the electrostatic phenomenon can be effectively reduced, and particle adhesion and microchip agglomeration are avoided.

The application provides a preparation method of an electrode foil, comprising the following steps: providing an unformed foil, wherein the unformed foil comprises an aluminum foil substrate and an aluminum powder sintering layer which is combined on at least one surface of the aluminum foil substrate; sequentially performing primary formation, secondary formation, tertiary formation, quaternary formation and quinary formation on the unformed foil; wherein the formation solution of the primary formation, the secondary formation and the tertiary formation is an aqueous solution containing boric acid, citric acid and citrate or azelaic acid and azelaic acid salt, adipic acid and adipic acid salt; and the formation solution of the quaternary formation and the quinary formation is an aqueous solution containing boric acid and ammonium carbonate or ammonium pentaborate. The electrode foil prepared by the preparation method has a high specific capacity.

This invention discloses a method for preparing low-fluorine, high-purity tantalum pentoxide, relating to the fields of hydrometallurgical processes for tantalum compounds and the preparation of high-purity oxides. The method involves leaching tantalum-containing raw materials using a fluorinated acid system and extracting them with a phosphorus-containing extractant. The tantalum-loaded organic phase is then back-extracted using a fluorine-capturing-complexation-reversal back-extraction system containing ammonium oxalate, ammonium carbonate, ammonia, disodium ethylenediaminetetraacetate, polyethylene glycol 200, and supported fluorine-capturing microspheres. This yields a low-fluorine tantalum-containing back-extraction solution. The solution is then subjected to precipitation, multi-stage washing, drying, and calcination to obtain low-fluorine, high-purity tantalum pentoxide. The supported fluorine-capturing microspheres utilize macroporous adsorption resin microspheres as a carrier, with zirconium-cerium hydroxide active components immobilized through a polydopamine adhesion layer. This allows for simultaneous capture of fluoride ions during back-extraction, reducing fluorine residue in the product, minimizing impurity introduction, and improving product purity and process stability.