149 results about "Carbonatation" patented technology

The invention relates to the technical field of industrial control, and discloses a soda water production line intelligent control method and system based on the Internet of Things, and the method comprises the steps: obtaining a backpressure valve reference pressure value according to the obtained real-time dynamic data through employing a pre-constructed carbonation digital twin model, and calculating the backpressure valve reference pressure value according to the backpressure valve reference pressure value; the carbonation digital twinning model is set to obtain a theoretical pressure value by adopting the Henry law according to the target gas content and the real-time data of the mixed liquid temperature, and obtain a predicted pressure value by adopting the pre-constructed pressure prediction model according to the target gas content, the real-time data of the raw material liquid injection flow and the real-time data of the carbon dioxide injection flow; further obtaining a reference pressure value of the back pressure valve; according to a first difference value between the target gas content and the real-time gas content of the mixed liquid, a first feedback correction algorithm is adopted to correct the reference pressure value of the back pressure valve, and a dynamic pressure control instruction of the back pressure valve is obtained; and controlling the back pressure valve to execute the back pressure valve dynamic pressure control instruction. According to the method, the taste stability of the soda water is effectively improved.

The invention discloses an energy system and method for coupling calcium-based thermochemical heat storage and carbon capture. The energy system comprises a calcination unit, a carbon dioxide pretreatment storage unit, a calcium oxide heat exchange storage unit, a carbonation reaction unit and a heat utilization unit which are arranged based on a boiler. The calcining unit takes green valley electricity as energy to drive calcining reaction to realize heat storage, and generated CaO is processed by the calcium oxide heat exchange storage unit and then is stored for use in a heat release stage; generated COs are stored for standby application after passing through the carbon dioxide pretreatment storage unit; in the heat release stage, CaO and the desulfurized flue gas are subjected to heat release carbonation reaction in the carbonation reaction unit, and heat is released; caCO3 generated by the carbonation reaction can be used for the next heat storage stage; and the heat released by the carbonation reaction is conveyed to the heat utilization unit for heat exchange. Through coupling of calcium-based thermochemical heat storage and carbon capture, green electricity and off-peak electricity are fully utilized, and efficient storage and gradient utilization of energy are achieved.

The present invention relates to a method of producing a carbonated composite:a. providing a particulate mineral material, wherein the mineral material comprises metal slag, wherein the metal slag comprises steel slag;b. providing a modifier, wherein the modifier comprises sodium gluconate;c. mixing the mineral material and the modifier with water to form a slurry;d. treating the slurry with carbon dioxide, to form a wet solid residue, wherein the concentration of carbon dioxide is greater than about 10 vol%; ande. drying the wet solid residue to form the carbonated composite.

The invention relates to a method for recovering lithium and fluorine from aluminum electrolysis hazardous waste, which comprises the following steps: firstly, mixing organic polyol and alkaline hydroxide according to a molar ratio of 1: (0.5-2) to obtain a eutectic solvent; heating the eutectic solvent to 80-150 DEG C, and adding a proper amount of raw material fine powder and calcium oxide for reaction leaching; carbonating and filtering the leachate to obtain lithium carbonate; washing the leaching residues with an acetic acid solution to obtain a calcium fluoride product; the concentration of fluorine ions in the leachate is smaller than or equal to 200 ppm, and the purity of calcium fluoride is larger than or equal to 90%; the leaching rate of lithium in the method is greater than 85%; the slag feeding rate of fluorine is greater than 95%; and no hydrogen fluoride gas is generated in the method. According to the method, a non-toxic and biodegradable eutectic solvent is adopted as a leaching agent, and efficient leaching of lithium and fluorine in the aluminum electrolysis dangerous waste materials is achieved; calcium oxide is used as a precipitating agent, free fluorine is promoted to be precipitated and recycled as calcium fluoride, the whole process meets the requirement of green metallurgy, and the win-win situation of resources and the environment is achieved.

The thermal chemical heat storage and carbon capture system comprises a coal-fired boiler, a calcination reactor and a carbonation reactor, the calcination reactor extracts high-temperature flue gas from the front wall of a hearth of the coal-fired boiler, the high-temperature flue gas drives CaCO3 in the calcination reactor to be decomposed into CaO and CO2, and heat storage is achieved; the reacted flue gas is pumped back into a tail flue of the coal-fired boiler, and the flue gas flow required by the reaction is controlled through a flow control valve on a pumping pipeline; caO generated by the calcination reaction can enter the carbonation reactor in the heat release stage, a heat release carbonation reaction is carried out, heat is released, CaCO3 obtained after the heat release reaction returns to the calcination reactor through a pipeline to serve as a reaction raw material, and CO2 obtained after the heat release reaction is output to a heat supply system. The integration of heat storage, heat release and carbon capture is realized by utilizing calcium-based material circulation, and the peak regulation capacity and the carbon capture economy of the coal-fired unit are remarkably improved.

The invention relates to the technical field of aluminum oxide preparation, in particular to a method for preparing flaky aluminum oxide by using electrolyte waste liquid and flaky aluminum oxide. The method comprises the following steps: carrying out carbonation reaction on the electrolyte waste liquid by using carbon dioxide to obtain aluminum hydroxide precipitate; washing the aluminum hydroxide precipitate for the first time by using a washing agent to obtain a washed aluminum hydroxide solid-phase substance with a preset sodium content; calcining the washed aluminum hydroxide solid-phase substance to obtain a gamma-type aluminum oxide precursor; carrying out molten salt reaction on the composite molten salt system and the gamma-type aluminum oxide precursor to obtain a flaky aluminum oxide crude product; wherein the composite molten salt system is a mixture of sodium chloride, potassium chloride and sodium sulfate; and carrying out secondary washing on the sheet-shaped aluminum oxide crude product to obtain a sheet-shaped aluminum oxide product. According to the method, the flaky alumina with the high radius-thickness ratio is prepared under fluoride-free and strong acid conditions through a three-step core strategy of resource utilization of waste electrolyte, accurate sodium content control and directional induction of composite molten salt.

The present application aims at the problems of excessive consumption of traditional cement limestone resources, excessive energy consumption and high carbon emission, and provides a carbonated hardened low-calcium cement and a preparation and hardening method thereof, which is a hardening method for curing low-calcium cement by CO2 carbonation. The mass percentage composition of cement raw material components is: limestone: 60-70%, sandstone or clay or silica ash: 15-25%, phosphogypsum, fluorogypsum or desulfurization gypsum: 5-25%, component A: 0.5-2%. Component A is composed of the following raw material components in mass percentage: fluorite 0-50%, barium slag: 0-50%, lithium slag 0-50%, wood ash 0-50%, industrial sodium carbonate 0-30%. The composition design of carbonated hardened cement clinker minerals is C2S: 10-90%, C5S2$: 10-90%, C$: 0-5%, C4A3$: 0-10%, etc. In the present application, the limestone required for the cement clinker is lower than that of ordinary Portland cement clinker, the calcination temperature is reduced by 200-350 DEG C than that of ordinary Portland cement clinker, and the energy consumption and carbon emission are significantly lower than those of Portland cement; the low-calcium cement is hardened by CO2 carbonation curing, which can make the cement obtain excellent mechanical properties within 2 hours.

The invention provides a bouquet-shaped calcium carbonate preparation method, and relates to the technical field of calcium carbonate preparation processes. The preparation method comprises the following steps: 1) adding polyhydroxy organic acid into water as a base solution; 2) preparing a calcium hydroxide suspension as a calcium source; (3) simultaneously adding a calcium source into the base solution and introducing CO2 gas; 4) adjusting the adding speed of a calcium source in real time to control the reaction conductivity interval until the carbonation reaction is finished to obtain a calcium carbonate suspension; and 5) precipitating, filtering, drying and screening the obtained suspension to obtain a target product. According to the invention, the formation of bouquet-shaped calcium carbonate crystals is controlled by combining conductivity regulation and control and an organic molecule induction method. The method is simple in operation process and small in chemical reagent addition, and the prepared bouquet-shaped calcium carbonate is uniform in morphology, good in dispersion, multiple in interfacial active sites, large in specific surface area and rich in pores and has a secondary fine structure.

The present invention relates to a process for binding carbon dioxide to a waste building material 10, wherein the reaction is carried out in a carbonation reactor 20, wherein a waste building material 10 is fed to the carbonation reactor 20, wherein a carbon dioxide-containing gas 30 is fed to the carbonation reactor 20, and wherein a carbonation product 50 is discharged from the carbonation reactor 20, characterized in that the alkaline earth content of the waste building material 10 fed to the carbonation reactor 20 and / or of the carbonation product 50 discharged from the carbonation reactor 20 is determined by means of elemental analysis 60, wherein the degree of carbonation C of the carbonation product 50 is determined by IR spectroscopy, and wherein a carbonation degree limit value Cmax is set.wherein if the carbonation degree limit Cmax is undershot, the supply of the waste material 10 to the carbonation reactor 20 is reduced and / or the supply of the carbon dioxide-containing gas 30 to the carbonation reactor 20 is increased, wherein if the carbonation degree limit Cmax is exceeded, the supply of the waste material 10 to the carbonation reactor 20 is increased and / or the supply of the carbon dioxide-containing gas 30 to the carbonation reactor 20 is reduced.

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

The present invention provides a carbonation treatment system and a carbonation treatment method that can obtain granules having a desired particle size in high yield. [Solution] The carbonation treatment system 10 comprises a carbonation device 1 that carbonizes a material to be treated F by bringing it into contact with carbon dioxide gas to produce a carbonated product P, a granulation device 2 that granulates the carbonated product P transported from the carbonation device 1, and a moisture content adjustment mechanism 3 that adjusts the amount of moisture added to the carbonated product P.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

The application discloses a CO2 capture method and system based on fuel staged conversion coupled with chemical looping combustion, and the method comprises the following steps: flue gas is introduced into a carbonation tower filled with metal oxygen carriers MeO and adsorbents A, the adsorbents A adsorb CO2 in the flue gas, and then the solid in the tower is transported to a calciner; the adsorbents A after adsorption are decomposed into the adsorbents A and CO2 in the calciner, the MeO in the calciner reacts with the substances transported in a fuel pre-conversion reactor to generate a reduced metal oxygen carrier; the regenerated adsorbents A and the reduced metal oxygen carrier in the calciner are transported to an air reactor to generate MeO and regenerated adsorbents A which are returned to the carbonation tower; fuel and reactants are introduced into the fuel pre-conversion reactor, part of the fuel is converted, and the products are sent into the calciner. Through fuel partial conversion and chemical looping combustion, the application realizes grade matching of the fuel conversion and the adsorbent regeneration process, avoids air separation energy consumption of separated pure oxygen, and effectively reduces CO2 capture energy consumption after medium-high temperature adsorption combustion.

The application provides a calcium method carbon capture and waste heat power generation integrated system and method. The system comprises an absorption reactor, a calcination reactor, a power generation cycle loop, a first heat exchanger and a second heat exchanger. The absorption reactor is used for carbonation exothermic reaction of calcium oxide and carbon dioxide in flue gas. The calcination reactor is used for calcination of generated calcium carbonate, regeneration of calcium oxide and generation of carbon dioxide. The power generation cycle loop comprises a working medium water pipeline and a feed water pump, an expansion generator and a condenser connected thereto. The first heat exchanger is arranged in the absorption reactor and connected to the working medium water pipeline, and is used for absorbing heat released in the carbonation exothermic reaction. The second heat exchanger is in communication with the carbon dioxide flue gas outlet of the calcination reactor, and is connected to the working medium water pipeline and located upstream of the first heat exchanger, and is used for recovering sensible heat of the carbon dioxide flue gas to preheat the working medium. The method utilizes the above system, and heats the working medium by gradient recovery of reaction heat and flue gas sensible heat and drives the expansion generator to generate power.

The invention discloses a steel slag waste heat recovery device and process capable of synergistically fixing carbon, and relates to the field of steel slag pretreatment in the metallurgical industry, the steel slag waste heat recovery device comprises a hot-state steel slag receiving hopper, a hot-state steel slag chain scraper conveyor, a boiler bottom water tank, a boiler system, a cold-state steel slag bucket elevator conveyor, a carbon fixation reaction box body, a CO2 gas supply system and a cold slag conveying belt which are connected in sequence. According to the process, hot-state steel slag reacts with slag disintegrating water in a water tank at the bottom of a boiler to generate combustible gas, and the combustible gas combusts in a boiler system to heat circulating water to generate high-temperature and high-pressure steam to realize waste heat recovery; warm-state steel slag at 60-80 DEG C after slag disintegration and purified CO2-containing industrial waste gas are subjected to carbonation reaction in a carbon sequestration reaction box, the content of free calcium oxide and free magnesium oxide in the steel slag is reduced, and CO2 solid storage is achieved synchronously. The method is high in waste heat recovery efficiency, stable in steam output and remarkable in carbon sequestration effect, the resource utilization value of the steel slag is greatly improved, outstanding economic and environmental protection benefits are achieved, and iron and steel enterprises are assisted to achieve the dual-carbon target.

The invention belongs to the related technical field of thermochemical energy storage, and discloses a thermochemical energy storage system and an energy storage method with double revolving beds cooperating with calcium circulation. The system comprises a calcination reactor, a carbonation reactor, a carbon dioxide storage tank, a calcium carbonate storage tank and a calcium oxide storage tank, the outlet end of the calcination reactor is connected with the carbon dioxide storage tank and the calcium oxide storage tank, and a first gas-solid heat exchanger is arranged between the carbon dioxide storage tank and the calcination reactor; the calcium carbonate storage tank is connected with the calcination reactor through the first gas-solid connector; the inlet end of the carbonation reactor is simultaneously connected with the calcium oxide storage tank and the carbon dioxide storage tank, a second gas-solid heat exchanger is arranged between the carbonation reactor and the carbon dioxide storage tank, and the outlet end of the carbonation reactor is connected with the calcium carbonate storage tank through the second gas-solid heat exchanger. According to the invention, the problems of difficult coupling and low heat utilization rate in the heat absorption and release process are solved.

The invention discloses a solid waste filling method based on cooperation of an MICP technology and carbon dioxide mineralization. Gangue aggregate is treated through microbial infiltration; cO2 is introduced into the alkaline solid waste for carbonation treatment, so that the alkalinity of the alkaline solid waste is reduced, and CO2 is absorbed and cured; the microbe modified aggregate and the mineralized solid waste slurry are fully mixed according to a reasonable ratio to form the filling slurry with stable performance. After the slurry is injected into the goaf, calcium carbonate is formed through induction of the MICP technology, calcium carbonate crystals are further generated, internal pores of the material are effectively filled, and the compactness and certain mechanical performance of the grouting body are enhanced. The method can synchronously and efficiently solve the problem of treatment of solid wastes such as coal gangue and fly ash, realizes large-scale storage of CO2, provides a filling body with excellent mechanical properties for a goaf, enhances the surface corrosion resistance and improves the bonding property with surrounding rock.

A method for recovering lithium from waste according to the present invention comprises the steps of: preparing lithium carbonate; converting the lithium carbonate into slurry containing lithium hydroxide and calcium carbonate by using calcium hydroxide; performing solid-liquid separation of the slurry; first purifying the solid-liquid separated lithium hydroxide aqueous solution to obtain solid waste and a purified lithium hydroxide aqueous solution; second purifying the purified lithium hydroxide aqueous solution through an ion exchange resin; crystallizing the lithium hydroxide aqueous solution subjected to the second purification to obtain lithium hydroxide, wherein the second purification step utilizes an acid regeneration method to regenerate the ion exchange resin, thereby generating acid-regeneration wastewater and a lithium hydroxide purge solution is generated in the step of crystallizing the lithium hydroxide aqueous solution; carbonating the lithium hydroxide purge solution to obtain lithium carbonate and lithium carbonate purge wastewater; preparing a wastewater mixture by mixing the acid-regeneration wastewater, the lithium carbonate purge wastewater, and the solid waste; neutralizing the wastewater mixture; introducing a lithium adsorbent into the neutralized wastewater mixture to selectively adsorb lithium; desorbing the adsorbed lithium to obtain a desorption solution; carbonating the desorption solution to obtain lithium carbonate and a carbonated filtrate; and recycling the carbonated filtrate to the step of neutralizing the wastewater mixture.

Method and equipment for conditioning wet concrete (703), the wet concrete (703) being agitated in a revolving-drum concrete mixer (702), thereby bringing changing portions of the wet concrete (703) to a free surface (706) of the wet concrete (703) inside the mixer (702), the agitated wet concrete (703) being cooled and partially carbonated in that liquid and / or solid carbon dioxide is supplied to the concrete mixer (702) simultaneously with liquid nitrogen so that both the supplied nitrogen and the supplied carbon dioxide contact the free surface (706) of the wet concrete (703).

This invention discloses an alkaline leaching and carbonization treatment method for scandium-containing materials, belonging to the technical field of wet processing of scandium-containing materials. The method includes: alkali leaching the scandium-containing material to obtain a mixed slurry; passing carbon dioxide through the mixed slurry for selective scandium leaching via carbonation; and performing liquid-solid separation to obtain a scandium-containing leaching solution and a leaching residue. This invention, through alkaline leaching followed by carbonization, selectively leaches scandium from the scandium-containing material, while zirconium and components with similar properties, as well as other impurities, remain in the residue without leaching. Based on the scandium-containing leaching solution obtained after liquid-solid separation, scandium recovery rate and purity can be improved.

The invention relates to the technical field of inorganic non-metallic materials, in particular to a composite material for low-carbon steel protection and a preparation method of the composite material. The composite material comprises a highly carbonated active component and a highly hydrated active component, the preparation method adopts a two-stage synergistic process: in the first stage, carrying out accelerated carbonation treatment in a CO2-rich environment, so that gamma-C2S on the surface layer of the material forms a compact calcium carbonate shell layer; and a second stage, under a wet curing condition, hydrating the non-carbonated cement clinker in the inner core area protected by the outer shell layer to generate sufficient calcium hydroxide, and reconstructing and maintaining a high-alkalinity passivation environment around the reinforcing steel bar. According to the invention, by constructing a core-shell structure of physical shell-chemical core, rapid storage of CO2, early reinforcement of the material and endogenous and long-acting protection of the reinforcing steel bar are synchronously realized, the problem of corrosion of the reinforcing steel bar caused by low alkalinity of the carbon mineralized cementing material is effectively solved, and the application of the carbon mineralized cementing material in structural engineering is promoted.

The present application belongs to the technical field of direct liquid-phase carbonation of alkaline solid waste, and discloses a system for direct liquid-phase carbonation of carbide slag in a bubbling bed, which comprises a bubbling bed reaction system, a collection and analysis system and a liquid-phase circulation system. The present application also discloses a method for realizing carbon fixation of carbide slag at normal temperature and pressure and recycling of liquid phase by using the system, and the flow pattern in the bubbling bed reactor is monitored and controlled. On the one hand, CO2 fixation at normal temperature and pressure and treatment of alkaline solid waste can be implemented, and environmental pollution can be reduced; on the other hand, recycling of liquid phase can be realized, water resources can be saved, and comprehensive treatment and disposal of alkaline solid waste and CO2 at low energy consumption can be realized.

The invention provides an ultrahigh-base-number composite calcium salt detergent, a preparation method thereof and a lubricating oil complexing agent. The preparation method comprises the following steps: mixing solvent oil, base oil, an accelerant A, an accelerant B, sulfonic acid, salicylic acid, first inorganic calcium and an accelerant C for neutralization reaction; carbon dioxide is introduced, second inorganic calcium and water are added for a carbonation reaction, a product is purified after the reaction is finished, and the composite calcium salt detergent is obtained; the accelerant B is selected from a combination of two or more than three of polyisobutylene succinic anhydride, dodecenyl succinic anhydride, polymethacrylate, trimethylolpropane isooctoate, alkylphenol formaldehyde resin and benzylamine. The composite calcium salt detergent disclosed by the invention has the advantages of ultrahigh base number and better thermal stability, and can fundamentally improve the problem of precipitation when calcium sulfonate and calcium salicylate are compounded.

The invention relates to a method for capturing acidic pollutants from flue gas by recycling steel slag generated in a steelmaking process of a steel plant as an adsorbent. The acidic pollutants comprise HCl, HF, SOx and / or NOx. In order to improve the efficiency of capturing nitrogen oxides, the steel slag contains crystalline calcium silicate and a calcium magnesium silicate phase. Furthermore, the method for producing the adsorbent should comprise the steps of: producing a particulate steel slag material from the steel slag, the particulate steel slag material having a first particle size distribution having a D50 mesh size value of less than 70 m and a first specific surface area; and increasing the first specific surface area of the particulate steel slag material to a second specific surface area higher than 5 m2 / g by carbonating the particulate steel slag material with a gas comprising carbon dioxide. The flue gas is then contacted with at least a portion of the carbonated granular steel slag material as the adsorbent to trap the acidic contaminants in the carbonated granular steel slag material.

The invention belongs to the technical field of industrial solid waste resource utilization and building materials, and relates to a vaterite type stable artificial aggregate prepared by pomegranate peel-steel slag synergistically, a preparation method of the vaterite type stable artificial aggregate comprises the following steps: extracting dry pomegranate peel by adopting a hydrothermal method to obtain a pomegranate peel extract; mixing steel slag powder, cement, fly ash and the pomegranate peel extract to obtain a mixed raw material, and carrying out water spraying granulation to obtain aggregate; standing the aggregate for primary maintenance; and placing the primarily cured aggregate in a carbonization box, filling carbon dioxide, and carrying out carbonation treatment and secondary curing to obtain the vaterite type stable artificial aggregate. The pomegranate peel extract is used as a green crystal regulating agent, a large amount of vaterite in the steel slag is induced to be generated through carbonation curing, the problems that in a traditional technology, calcite crystal form carbonization efficiency is low, and the volume stability is poor are solved, and the obtained aggregate can be used for concrete aggregate and underground filling materials.

The invention discloses calcium-based heat storage particles as well as a preparation method and application thereof. The heat storage particles are prepared from the following raw materials in percentage by mass: 60 to 90 weight percent of limestone powder, 2 to 30 weight percent of aluminum cement, 2 to 30 weight percent of manganese sand and 6 to 20 weight percent of pore forming agent, the use amount of the binder is 20-40 ml per 100 g of the raw materials. The preparation method comprises the following steps: mixing the limestone powder, the aluminum cement, the manganese sand and the pore-forming agent, performing ball milling, adding the binder, uniformly mixing to obtain slurry, and preparing spherical particles; calcining the spherical particles in an air atmosphere, carbonating the spherical particles in a CO2 atmosphere, heating the spherical particles to a preset heat treatment temperature, keeping the temperature, and cooling and carbonating the spherical particles again to obtain finished particles. The heat storage particles provided by the invention have abundant pore structures and a skeleton formed by the high-temperature-resistant metal oxide, so that the particles have excellent cycle stability and good compressive strength.

The invention belongs to the technical field of thermochemical energy storage, and particularly relates to a rotary heat release device and method suitable for calcium circulation energy storage. The device comprises a feeding mechanism, a reaction mechanism and a discharging mechanism which are connected in sequence, the feeding mechanism comprises a CaO feeding assembly and a CO2 feeding assembly; the discharging mechanism comprises a CaCO3 discharging assembly and a CO2 discharging assembly; the reaction mechanism comprises a rotary reactor, an angle adjusting assembly, a rotating assembly and a heating assembly; the rotating assembly is used for controlling the rotation of the rotary reactor, and the heating assembly is used for heating the rotary reactor; the angle adjusting assembly is used for adjusting the inclination angle of the rotary reactor. By means of the rotary reactor and inclined arrangement, the CaO carbonation conversion rate can be remarkably increased, continuous energy storage is achieved, and development of renewable energy surplus heat energy storage is promoted.

The invention relates to the technical field of red mud gelation reaction, and particularly provides a preparation device and method of a red mud-based adsorption thick coating type fireproof coating. The device comprises a red mud slurrying device, a gelation reaction device, a granulation drying device and a mixing device which are communicated in sequence. The method comprises the following steps: mixing red mud with an additive to prepare slurry; concentrated flue gas with the CO2 concentration being 35%-95% is introduced for a carbonation gel reaction, silicic acid gel and alumina gel containing structural water are generated, and the pH is adjusted to be 6-9; after the reaction, performing spray drying on the slurry to obtain powder; and finally, mixing with a composite additive to obtain a finished product. The doping amount of the red mud is increased to 35%-60%, high-value resource utilization of the red mud is achieved, the obtained coating product has excellent fire resistance and a toxic gas adsorption function, meanwhile, industrial flue gas is used as a carbon source and a heat source, the process is synergistic and efficient, and the cost is remarkably reduced.

The invention discloses an electrochemical calcium cycle carbon dioxide trapping system based on calcium carbonate and calcium hydroxide. The system comprises a calcium hydroxide generation module, a carbonation module and a carbon dioxide treatment module. Firstly, acid and alkali are generated in the calcium hydroxide generation module by adopting an electrochemical method, calcium carbonate is decomposed by the generated acid to obtain calcium ions and release carbon dioxide, and the carbon dioxide is dried, compressed and stored by the carbon dioxide treatment module. And reacting the calcium ions with the generated alkali to obtain calcium hydroxide. Calcium hydroxide can be used as a solid carbon dioxide adsorbent, and carbon dioxide is captured in the carbonation module to obtain calcium carbonate. Therefore, electrochemical calcium cycle carbon dioxide capture is realized. The method is low-carbon, environment-friendly, high in energy efficiency, simple and feasible, and beneficial to solving the problems of energy consumption and pollution of carbon dioxide capture.

The invention discloses a normal-temperature and normal-pressure preparation method of a carbon dioxide trapping material for solid waste derived direct air trapping, and relates to the technical field of preparation of carbon dioxide trapping materials. According to the method, industrial solid wastes (such as converter steel slag, nickel slag and copper slag) containing alkali metal or alkaline earth metal oxide components (such as MgO, CaO and FeO) are taken as raw materials, solid waste powder with the particle size of 100-800 microns is obtained through crushing and screening, and the solid waste powder and an interface regulating agent (such as silicate or aluminate compound) are subjected to dry mixing at normal temperature and normal pressure to form a surface interface regulating layer; then pre-carbonation induction treatment is carried out, so that a discontinuous carbonate reaction layer is formed on the surface layer of the powder, and the internal activity is kept; and finally, carrying out structure stabilization treatment to obtain the carbon dioxide trapping material. The whole preparation process does not need pressurization or high-temperature calcination, the cost is low, the energy consumption is low, the material realizes carbon dioxide capture through a reversible carbonation reaction under a direct air capture working condition, and the material has the advantages of stable structure and good cycle performance.