318 results about "Ammonium bicarbonate" patented technology

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

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

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

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

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

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

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

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

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

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

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

The invention provides a method for synergistically removing impurities through pH regulation and complexing of ionic rare earth ore leachate, the ionic rare earth ore leachate is stirred and mixed uniformly, a plant polyphenol sulfonic acid derivative complexing agent is added, the complexing agent is prepared through sulfonation, neutralization, concentration and drying by taking gallic acid as a raw material, and the complexing agent can automatically regulate the pH value of the solution and stabilize the pH value at 5.1-5.3; under the condition, phenolic hydroxyl groups, carboxyl groups and sulfonic functional groups in complexing agent molecules preferentially form stable precipitates with impurity ions such as Al < 3 + > and Fe < 3 + > in the leachate, and the complexing effect with rare earth ions (RE < 3 + >) is weak; and after the reaction is completed, carrying out solid-liquid separation to obtain the purified leachate and impurity-containing precipitation slag. The method solves the problem of ammonia nitrogen pollution caused by use of ammonium bicarbonate, ammonia water and other ammonium salts in the traditional process, is a novel method with high impurity removal rate, simple process flow and environmental friendliness, and is suitable for industrial application.

The invention relates to the technical field of composite materials, in particular to a synergistic flame-retardant epoxy resin-based porous sound insulation composite material and application thereof. The raw materials comprise 100 parts of bisphenol A epoxy resin, 15 parts of an aliphatic amine curing agent, 12 parts of ammonium dihydrogen phosphate, 6 parts of melamine, 4 parts of nano silicon dioxide, 5 parts of sodium chloride, 2 parts of ammonium bicarbonate, 0.8 part of carbon nanotubes and 0.5 part of a silane coupling agent. The synergistic flame-retardant epoxy resin-based porous sound-insulation composite material provided by the invention effectively solves the technical bottleneck that the flame-retardant, sound-insulation and mechanical properties of an epoxy resin-based material in the prior art are difficult to synergistically improve, and has remarkable beneficial effects in multiple aspects.

The invention discloses a method for extracting manganese from calcium-process vanadium extraction circulating water by using ammonium bicarbonate, and belongs to the technical field of treatment of calcium-process vanadium extraction circulating water. The invention relates to a method for extracting manganese from calcium-process vanadium extraction circulating water by using ammonium bicarbonate, which comprises the following steps of: detecting main components of the calcium-process vanadium extraction circulating water as an extraction object, weighing the ammonium bicarbonate, feeding a small amount step by step, reacting, filtering, removing impurities, washing and drying to obtain a manganese carbonate product meeting the industrial standard. The method provided by the invention has the advantages of single raw material, few steps, simple operation, low cost and high product yield, and can realize simple and rapid recovery of the standard manganese carbonate product.

The application discloses a high-strength steel unqualified zinc-cadmium alloy plating layer stripping method, and its stripping process is as follows: 80-150 g / L of sodium nitrite, 50-100 g / L of ammonium bicarbonate, 50-100 g / L of ammonium chloride, the pH of the stripping solution is 6-8, and normal temperature operation is adopted. The sodium nitrite is used as an oxidizing agent and a steel base inhibitor for the zinc-cadmium alloy plating layer, the ammonium bicarbonate is used as a complexing agent for zinc ions and cadmium ions and a pH buffer for the plating solution, and the ammonium chloride is used as a complexing agent for zinc ions and cadmium ions and a promoter for dissolving the zinc-cadmium alloy plating layer. When the pH of the stripping solution is too high, dilute nitric acid is used to reduce the pH, and when the pH is too low, sodium carbonate solution is used to increase the pH. The technical scheme of the application is used to replace the chromium acid stripping method, and the high pollution problem caused by the use of the chromium acid is overcome.

The application provides a salt resourceization process, which can realize the double effects of carbon capture and waste resourceization. The salt resourceization process comprises an organic waste treatment step and a waste salt treatment step. The organic waste treatment step comprises the following steps: anaerobic digestion treatment of organic waste to obtain biogas and a digestion liquid; combustion of the biogas in a combustion chamber to obtain high-temperature flue gas containing carbon dioxide; separation treatment of the digestion liquid to obtain ammonia water; reaction of the carbon dioxide in the high-temperature flue gas with the ammonia water to obtain ammonium bicarbonate. The waste salt treatment step comprises the following steps: pyrolysis and water rinsing of waste salt as solid waste to obtain purified salt; double decomposition reaction of the purified salt with the ammonium bicarbonate to obtain sodium bicarbonate crystal slurry; centrifugal dewatering and drying of the sodium bicarbonate crystal slurry.

The present application belongs to the field of combustible gas, and particularly relates to a composite catalyst, a preparation method thereof, and a method for preparing combustible gas. The preparation method of the composite catalyst comprises the following steps: dissolving humic acid in deionized water to obtain a humic acid aqueous solution, then adjusting the humic acid aqueous solution to be acidic, and finally adding ammonium bicarbonate, zinc chloride and aluminum nitrate into the humic acid aqueous solution and reacting for a period of time at a certain temperature to obtain a solution of the composite catalyst. The method for preparing combustible gas comprises the following steps: dissolving the above-mentioned solution of the composite catalyst in methanol to obtain a mixture, and gasifying the methanol reforming gas into combustible gas. After the composite catalyst aqueous solution and the methanol are mixed, the composite catalyst can be taken away by gasification while performing catalysis in the methanol reforming process, so that the problem of carbon deposition in the equipment is avoided, the efficient catalysis of the equipment is ensured, and the maintenance cost in the later period is reduced.

The invention relates to the technical field of desulfurizing agents, in particular to a reusable iron oxyhydroxide desulfurizing agent and a preparation method thereof. The problem that the activity of a traditional material is reduced due to sulfate accumulation and compact layer formation in a vulcanization-regeneration cycle is solved. The preparation method comprises the following steps: dissolving ferric nitrate and urea, adjusting the pH value to 1.8, and adding cerous nitrate and citric acid; heating, introducing zirconium oxynitrate, controlling the pH value at 3.7-3.9 for 2-3 hours, heating to 7.2, adding samarium nitrate and zirconium acetylacetonate, aging, and mixing with bentonite and ammonium bicarbonate for molding; and finally, carrying out segmented activation in a nitrogen and low-oxygen mixed atmosphere. The desulfurizer has high specific surface area and pore volume, the breakthrough sulfur capacity reaches 148-160mgS / g, the 10-time circulating sulfur capacity retention rate is 88-91%, and the desulfurizer is high in particle compressive strength, low in abrasion rate and suitable for the industrial desulfurization process.

The invention provides a near-critical density foam target as well as a preparation method and application thereof, and belongs to the technical field of foaming macromolecules. According to the invention, ammonium bicarbonate is used as a foaming agent and is decomposed to generate NH3, CO2 and H2O which are gases or volatile liquids, no solid impurity is left, and the purity of the foam target is improved; by limiting the use amount of ammonium bicarbonate, the foaming amount can be adjusted, so that the foam target reaches the near-critical density, and the laser plasma interaction requirement is met; by limiting the type of the polymer and the use amount of the solvent, the precursor solution can have high initial viscosity, initial bubble expansion is inhibited, and stable growth of bubbles is adapted along with gradual decomposition of ammonium bicarbonate in the heating process.

The application provides a preparation method and application of resveratrol-polylactic acid microspheres, and relates to the technical field of biological agents, quantitative resveratrol is dissolved in methanol as O1 phase; quantitative polylactic acid is dissolved in an oil phase solution (ethyl acetate, dichloromethane, trichloromethane) as O2 phase; ammonium bicarbonate, sodium bicarbonate, sodium chloride and hydrogen peroxide are used as a porogen; O1 phase, O2 phase and the porogen solution are subjected to ultrasonic emulsification to obtain O / O primary emulsion; the O / O primary emulsion is added to a polyvinyl alcohol aqueous solution under stirring to obtain O / O / W multiple emulsion; the obtained O / O / W multiple emulsion is subjected to mechanical stirring to remove the oil phase solution in the O / O / W multiple emulsion, and then is subjected to standing, centrifugation, washing, drying and the like to obtain resveratrol-polylactic acid microspheres with uniform size. The resveratrol-polylactic acid microspheres of the application break through the bottleneck of poor water solubility of resveratrol, can effectively prolong the drug action time, and have good antibacterial effect.

The invention discloses a preparation method of modified in-situ ZTA composite ceramic with good wettability with high-chromium cast iron, and relates to the technical field of ceramic-based composite materials. The preparation method comprises the following steps: fully stirring and mixing a ZTA precursor solution prepared from aluminum ammonium sulfate, zirconium oxychloride, yttrium nitrate, polyethylene glycol and ammonium bicarbonate through chemical coprecipitation with a Ni precursor solution prepared from nickel acetate hydrate and potassium hydroxide through a chemical precipitation method, carrying out liquid-liquid doping, and carrying out calcination and reduction processes to obtain powder; a modified authigenic ZTA multiphase ceramic block with good wettability with high-chromium cast iron can be obtained after vacuum hot pressed sintering, and the ceramic block can be used in a ceramic particle reinforced iron-based composite material after being broken and sieved; the ZTA composite ceramic is in-situ synthesis, nickel is dispersed and uniformly distributed in ZTA, an interface is improved through a wetting and diffusion mechanism, and the wettability of the ZTA and high-chromium cast iron can be effectively improved under the condition that the performance of the ZTA is not affected.

The invention provides a method for extracting lithium-7 from waste ion exchange resin under a zinc injection working condition, and relates to the technical field of pressurized water reactor unit wastewater treatment. The method for extracting the lithium-7 from the waste ion exchange resin under the zinc injection working condition comprises the following steps: collecting eluted resin; eluting the lithium-7 in the elution resin by using an eluent to obtain a lithium-7 solution; and carrying out purification treatment on the lithium-7 solution. According to the extraction method, the elution resin is eluted to obtain the lithium-7 solution, then the lithium-7 solution is purified, and recycling of lithium-7 is achieved. Furthermore, an ammonium bicarbonate solution is used as an eluent, the recovery rate of the lithium-7 in the eluted resin can reach 75%, the extracted lithium-7 solution is purified by adopting an electrodialysis method, the purification efficiency can reach 78%, and good exchange capacity can still be kept after elution and degreasing, namely, the eluent does not influence the exchange capacity of the resin.

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.

The utility model provides a tetramethyl ammonium bicarbonate preparation device with low energy consumption, which comprises a reactive distillation tower, a static mixer, a methanol removal tower and a methanol recovery tower, a gas phase discharge port of the methanol removal tower is connected with an inlet of a steam compressor, a first branch connected with an outlet of the steam compressor is connected with a gas inlet of the methanol recovery tower, and a second branch connected with an outlet of the steam compressor is connected with a gas outlet of the methanol recovery tower. A second branch connected with an outlet of the steam compressor is connected with the first return tank through a heating medium channel of the steam generator; a third branch connected with an outlet of the first reflux tank is connected with a feed port of the methanol recovery tower, and a fourth branch connected with the outlet of the first reflux tank is connected with a tower kettle of the methanol removal tower; after pure water exchanges heat through a refrigerant channel of the steam generator, steam is output, and the steam is input into a tower kettle of the methanol removal tower through a pipeline; and the methanol recovery tower is provided with a side extraction opening for extracting high-purity methanol. The device disclosed by the utility model is low in operation energy consumption, low in equipment investment and high in raw material utilization rate, and can be used for continuously preparing high-purity TMAB and recovering to obtain a high-purity methanol product.

A method of treating a subterranean formation by contacting the formation with the following (a) ammonium bicarbonate; (b) an oxidizing agent selected from a perchlorate or a nitrite or combinations thereof; and (c) an acid (AA).

The invention relates to the technical field of leavening agents, and discloses a food composite leavening agent, which comprises the following components by mass: 25-30 parts of ammonium bicarbonate; 15 to 23 parts of microencapsulated ammonium citrate; 8 to 16 parts of sodium pyrophosphate; 5 to 9.5 parts of L-potassium hydrogen tartrate; 13 to 17 parts of trehalose; 0.5 to 1.3 parts of surface modified nano silicon dioxide; and 10 to 17 parts of hydroxypropylated cassava starch. The microencapsulated ammonium citrate is formed by coating beta-cyclodextrin, and the thickness of an embedding layer is 16-20 [mu] m. The multi-layer microcapsule structure is constructed by carrying out gradient embedding on ammonium citrate through beta-cyclodextrin, so that staged release of gas production substances is realized. According to the structure, different temperature intervals are accurately matched in the baking process, it is guaranteed that the gas production rate is synchronous with the dough expansion requirement, and the problem of excessive expansion or insufficient gas production caused by concentrated release in the traditional technology is solved.

The application belongs to the technical field of pigments, and particularly discloses a preparation method of cobalt tin blue pigments, which comprises the following steps: S1, dissolving cobalt salt and tin salt in water to prepare a base solution, and then adding citric acid and stirring to obtain a complex metal salt solution; S2, dissolving ammonium bicarbonate in deionized water to obtain a precipitant solution; S3, under the condition of 40-60 DEG C and constant speed stirring, the precipitant solution obtained in step S2 is added dropwise into the complex metal salt solution obtained in step S1, so that the reaction is completed within 1-2 hours; after the dropwise addition is completed, the reaction system is heated to 80-95 DEG C, and is aged at the temperature for 2-4 hours to obtain a precursor precipitate; and S4, the precursor precipitate obtained in step S3 is filtered, washed and dried, and then calcined in an air atmosphere, and after the calcination, the furnace is cooled and the product is ground, so that the whole precipitation process is more gentle and uniform, the components of the final product are more uniform, the chroma is more accurate, and the purity is higher.

Apparatus and method for producing ammonium bicarbonate in an ammonia-based decarbonization system are provided. The apparatus comprises a cooling function zone operable to cool a process gas; an ammonium bicarbonate generation zone operable to generate ammonium bicarbonate; a carbon dioxide absorption zone operable to absorb, via multi-stage absorption, carbon dioxide from the process gas; and an ammonia removal function zone operable to remove ammonia from a decarbonized process gas, wherein absorbent ammonia for carbon dioxide removal is mainly added into the carbon dioxide absorption zone. Through zone control of ammonium bicarbonate generation, CO2 absorption and ammonia removal, the efficiency of decarbonization absorption may be improved, and ammonia escape may be reduced. Meanwhile, carbon dioxide in flue gas can be utilized for producing ammonium bicarbonate as a nitrogen fertilizer.

The invention discloses a method for extracting manganese from low-grade rhodochrosite, which comprises the following steps: drying, crushing and screening the low-grade rhodochrosite, uniformly mixing with a flux, heating to 165 DEG C in a tubular furnace under the protection of inert gas, roasting at constant temperature, heating to 245 DEG C, roasting at constant temperature, then heating to 620 DEG C, roasting at constant temperature, and naturally cooling to room temperature after roasting, and adding deionized water, leaching manganese sulfate from the roasted sample at room temperature, filtering and separating, carrying out graded purification and impurity removal on the filtrate, adding ammonium bicarbonate to convert the manganese sulfate into manganese carbonate, filtering, washing with deionized water, and carrying out high-temperature calcination to obtain the manganous-manganic oxide. According to the method, a pyrogenic process flux is utilized to form a reducing atmosphere under the protection of inert gas, a manganese source in the low-grade rhodochrosite is fully utilized, high-valence manganese in the low-grade rhodochrosite is reduced into + 2-valence low-valence manganese, the low-valence manganese is utilized to carry out sulfation reaction, and formed soluble MnSO4 is soaked in deionized water, so that manganese is efficiently extracted from the low-grade rhodochrosite.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.