321results about "Magnesium carbonates" patented technology

The invention discloses a magnesium-carbon dioxide battery positive electrode material and a preparation method thereof, the chemical composition general formula of the magnesium-carbon dioxide battery positive electrode material is Mo4 / 3R2a / 3B2-VR ', VR' represents vacancy of R ', R is one or more of Lu, Dy, Er, Ho and Tb, R' is Y or Sc, and a is greater than or equal to 0.1 and less than or equal to 0.9; the preparation method comprises the following steps: calcining the material to obtain Mo4 / 3R '2 / 3-2a / 3R2a / 3AlB2, adding an etching agent, and selectively etching transition metal (Y or Sc) and Al to obtain a ternary transition metal boride, namely the positive electrode material of the magnesium-carbon dioxide metal battery. The preparation method is simple, the process is easy to control, and the prepared positive electrode material of the magnesium-carbon dioxide metal battery not only has excellent catalytic performance, but also shows low overpotential and long cycle life, and can efficiently and stably absorb and utilize carbon dioxide.

A method of capturing carbon dioxide, including providing a particle containing magnesium oxide, calcium oxide, or a combination thereof; and providing a mixture gas to contact the particle, wherein the mixture gas includes water vapor, carbon dioxide, and nitrogen oxide, and the particle captures the carbon dioxide to form a carbonated particle and a treated gas. The mixture gas has a relative humidity of 25% to 95%, a nitrogen oxide concentration of 20 ppm to 2000 ppm, and a carbon dioxide concentration of 0.05% to 15%.

A method of capturing carbon dioxide, including providing a particle containing magnesium oxide, calcium oxide, or a combination thereof; and providing a mixture gas to contact the particle, wherein the mixture gas includes water vapor, carbon dioxide, and nitrogen oxide, and the particle captures the carbon dioxide to form a carbonated particle and a treated gas. The mixture gas has a relative humidity of 25% to 95%, a nitrogen oxide concentration of 20 ppm to 2000 ppm, and a carbon dioxide concentration of 0.05% to 15%.

The invention relates to a method for preparing basic magnesium carbonate from heavy magnesium water under the assistance of nano-micro bubbles, and belongs to the technical field of preparation of basic magnesium carbonate. According to the method, nano-microbubbles are generated and are stirred and mixed with heavy magnesium water, and energy released when the nano-microbubbles are broken is utilized to promote the decomposition reaction of the heavy magnesium water, so that efficient crystallization of basic magnesium carbonate is realized under a low-temperature condition. According to the technical scheme, the dependence of a traditional heavy magnesium water preparation process on high-temperature and vacuum conditions is broken through, the energy consumption and the production cost for preparing the basic magnesium carbonate are remarkably reduced, and a new path is opened up for preparing the basic magnesium carbonate from the heavy magnesium water.

The invention discloses a method for selectively extracting magnesium and lithium components in aluminum alloy waste and co-producing graphene, and belongs to the technical field of aluminum alloy waste treatment.The method comprises the steps that the surface of the aluminum waste containing magnesium and lithium is covered with fused salt, and smelting is conducted under the inert atmosphere to obtain a melt; gas containing oxycarbide is introduced into the melt to selectively oxidize magnesium metal and lithium metal to generate a mixed product of magnesium oxide, lithium oxide and graphite carbon, the mixed product is migrated into a molten salt layer on the surface of the melt to form salt slag, the salt slag is subjected to acid leaching and solid-liquid separation, graphene is obtained, and the leaching solution is the magnesium-lithium leaching solution. According to the method, the aluminum alloy waste containing magnesium and lithium serves as the raw material, magnesium and lithium components in the alloy waste are extracted, oxycarbide is converted into high-value graphene in situ, the process technical route is simple and easy to implement, no pollutant or waste is generated, and the requirements of low-carbon development and industrial application are met.

To provide novel technical means capable of fixing CO2 by reacting a silicate mineral containing Mg, Ca, or the like with CO2 for fixing as a carbonate with easy process control and high treatment efficiency.SOLUTION: A method for fixing carbon dioxide includes: an amorphization treatment St1 for amorphizing an alkaline earth metal-containing mineral in an alkaline earth metal by mechanochemical treatment for applying mechanical stress to an alkaline earth metal-containing ore; and a carbon dioxide fixation treatment St2 for fixing the carbon dioxide as a carbonate of an alkaline earth metal by reacting magnesium eluted in a solution by putting the alkaline earth metal-containing ore subjected to the amorphization treatment St1 into the solution with the carbon dioxide.SELECTED DRAWING: Figure 1

Described herein are methods of using silicate materials, including silicate materials obtained from nature, synthesized, and / or obtained from industrial waste streams, to capture and store carbon dioxide. In some embodiments, the methods can also be used to form silica (e.g., high purity silica). In some embodiments, the methods can also be used to produce hydrogen.

The invention discloses a magnesium oxide thermochemical heat storage material and a preparation method thereof.The preparation method comprises the following steps that S1, magnesium salt and carbonate are weighed and added into deionized water to be dissolved, and a magnesium salt solution and a carbonate solution are formed; s2, adding the magnesium salt solution into the magnesium carbonate solution, controlling the reaction temperature to be 30-55 DEG C and the reaction time to be 3-5 hours, and filtering after the reaction; s3, drying the sample obtained in the step S2; s4, putting the dried sample into a high-temperature furnace in which the carbon dioxide or air atmosphere is controlled, and calcining to obtain the magnesium oxide thermochemical heat storage material; wherein the microstructure of the magnesium oxide thermochemical heat storage material is a coralline structure composed of nanoparticles. By accurately controlling the reaction process and the calcining atmosphere, the heat storage material with a special nanoscale structure is prepared, and the heat storage capacity of the magnesium oxide heat storage material is improved.

Described are methods for producing industrial gases (e.g., hydrogen, ammonia, and / or methane) using ferrous iron-containing materials (e.g., olivine) while concurrently sequestering carbon dioxide. The process may involve mixing a ferrous iron-containing material with water and, in some examples, a reaction accelerant. The mixture may be heated to 100-300°C to initiate the oxidation of ferrous cations (Fe2+) to ferric cations (Fe3+) while reducing hydrogen (from water) and / or methane (from water and carbon dioxide, when carbon dioxide is introduced into the ferrous iron-containing mixture). In some examples, carbon dioxide may be added later (after recovering hydrogen) to form carbonates. Specifically, carbon dioxide may be injected at a high pressure (e.g., about 200 bar) post-oxidation to facilitate mineralization, using the exothermic reaction to maintain a favorable temperature. In some examples, metal complexing / chelating reagents are added to bind trace metals such as nickel, copper, cobalt, and platinum group metals for recovery.

The invention discloses a method for recycling magnesium salt in the nickel-cobalt industry, and relates to the field of metal ion-containing wastewater treatment.The method comprises the steps that magnesium sulfate wastewater generated after multiple extraction reacts with medium alkali and strong alkali, a trace amount of surface treating agent is added, and a mixed precipitate of magnesium hydroxide and sulfate is generated; a part of water phase is filtered out through a filter press and returned to raw material slurrying, the remaining mixed slurry is pumped into a high-pressure reaction kettle, carbon dioxide is introduced into the kettle, a certain pressure is kept, meanwhile, a composite nano-catalyst La doped Fe3O4atSiO2 is introduced, and mixed slurry of soluble magnesium bicarbonate and insoluble sulfate is prepared; after rapid filtration, the synthesized and prepared magnesium bicarbonate filtrate is used for replacing liquid caustic soda to be saponified with a blank organic phase, carbon dioxide generated in the saponification reaction process is recycled, and soaped organic matter enters different extraction production lines to be subjected to purification and separation of multi-metal mixed feed liquid, so that virtuous cycle of a production system is achieved.

The invention discloses a method for oxidizing and separating manganese and magnesium and preparing basic magnesium carbonate by using manganese dioxide as a catalyst. The method comprises the following steps: firstly, adding a carbonization precipitator into a solution containing manganese and magnesium to preferentially precipitate and separate out manganese ions, and filtering to obtain manganese carbonate and filtrate A rich in magnesium ions; an oxidizing agent and a catalyst manganese dioxide are added into the filtrate A to catalyze oxygen residual divalent manganese ions and convert the divalent manganese ions into insoluble manganese dioxide, so that efficient separation of manganese and magnesium in the filtrate is realized, the manganese dioxide generated in the oxidation process forms self-enhanced circulation, catalytic activity is continuously provided, the oxidation efficiency is greatly improved, meanwhile, the dosage of the catalyst is reduced, and the cost is reduced. The oxidation reaction rate is stable; adding a carbonization precipitator and alkali into the treated filtrate, and carrying out staged reaction to enable magnesium ions to form high-purity basic magnesium carbonate precipitate. The process provided by the invention realizes efficient selective separation of manganese and magnesium, and the recovered product has high additional value, and can be widely applied to the fields of battery materials, catalysts, flame-retardant materials and the like.

The invention provides basic magnesium carbonate washing equipment, which belongs to the technical field of washing and comprises a washing tank and a driving part, a water outlet is formed in the bottom of the washing tank; the water outlet is communicated with vacuum filtration equipment through a pipeline; a filter cloth filtering structure is arranged in the washing tank, and a discharging opening is formed in the side wall of the washing tank; the driving part is arranged at the top of the washing tank; an output shaft of the driving piece is connected with a spline shaft; the spline shaft is connected with a spline cylinder, and the bottom end of the spline cylinder is connected with stirring blades; wherein the output end of the driving part is connected with a supporting part through a connecting part, the top of the supporting part is provided with a displacement part, and the displacement part is connected with the spline cylinder; the opposite ends of the supporting component and the displacement component are provided with inclined planes, and when the displacement component rotates along with the spline cylinder and the stirring blades, the stirring blades can reciprocate in the axial direction; through the arrangement, the labor intensity can be reduced, the material pollution is reduced, the washing water is saved, and the washing time is saved.

Methods and apparatus for reacting carbon dioxide with an alkaline waste material are provided. The alkalinity, water content and / or surface roughness of the waste material can be monitored during the reaction and appropriate actions undertaken based on the measured parameters to optimize the reaction conditions.

The invention discloses a sludge incineration ash treatment method based on mineralization reaction, a mineralization product and application, and belongs to the technical field of solid waste treatment and resource utilization. The method comprises the following steps: crushing and screening sludge incineration ash, carrying out acid leaching activation on the ash by using diluted hydrochloric acid, adjusting the pH value to 3-5, and filtering to obtain a pretreated ash solution; and carrying out mineralization reaction on the pretreated ash solution and CO2, and carrying out solid-liquid separation to obtain a carbonate mineralizer. The sludge incineration ash is used for replacing traditional natural minerals to serve as a CO2 mineralization reaction raw material, the purpose of treating waste with waste is achieved, calcium and magnesium ions in the ash are efficiently extracted through an acid leaching activation technology, heavy metal impurities are synchronously removed, and the problems of high raw material cost, large mining energy consumption and solid waste landfill pollution of a traditional mineralization technology are solved; the defects of an existing sludge incineration ash residue resource utilization method in the aspects of heavy metal solidification and harmlessness are overcome, the CO2 storage amount of a single ton of ash residues reaches 0.2-0.3 ton, and the cost is reduced by 40%-50%.

Embodiments of the present disclosure are directed to systems and methods of removing carbon dioxide from a gaseous stream using magnesium hydroxide and then regenerating the magnesium hydroxide. In some embodiments, the systems and methods can further comprise using the waste heat from one or more gas streams to provide some or all of the heat needed to drive the reactions. In some embodiments, magnesium chloride is primarily in the form of magnesium chloride dihydrate and is fed to a decomposition reactor to generate magnesium hydroxychloride, which is in turn fed to a second decomposition reactor to generate magnesium hydroxide.

The application discloses a kind of mixed mineral materials and methods for promoting long-term storage of sediment organic carbon, the material is composed of a certain proportion of serpentine and magnesite, steps are: 1) select mineral material serpentine and magnesite as raw material;2) serpentine and magnesite are pretreated;3) the serpentine and magnesite after pretreatment are mixed according to certain proportion;4) the mixed mineral material is spread to sediment surface with certain thickness;5) through the reaction of mixed mineral material and sediment organic carbon to generate stable magnesium carbonate mineral, realize long-term storage of sediment organic carbon in situ.The mineral material in the application has the characteristics of environmental friendly, reasonable formula, convenient to use, ecological environmental protection and the like.The application realizes long-term storage of sediment organic carbon in situ by the reaction of mixed mineral material and organic carbon, provides new ideas for water ecological restoration engineering to help carbon neutralization and realize sediment in situ carbon storage.

The application discloses a method for changing the carbonate reverse pump into positive and enhancing the carbon sink efficiency based on microalgae alkaline cultivation tail water. The method comprises the following steps: cultivating microalgae, treating the microalgae alkaline cultivation tail water, and utilizing the tail water to enhance the carbon sink ability of the carbonate reverse pump. Compared with other carbon sink approaches, the method changes the carbonate reverse pump into positive, combines the biological carbon fixation of the microalgae, realizes the combined carbon fixation of the carbonate reverse pump and the biological carbon pump of the microalgae, and significantly improves the overall carbon sink efficiency of the technical approach. In addition, the application also co-produces high-value microalgae biomass, creates economic value, and realizes the resource utilization of the microalgae cultivation tail water, thereby providing an effective approach for solving the problems of microalgae cultivation resource waste and low carbon sink efficiency.

Disclosed herein are acid-base leaching methods and systems. Specifically, the systems and methods can include reacting a feed material comprising at least two metals selected from the group consisting of iron, magnesium, and calcium with a weak acid to produce a first leachate comprising ions of the at least two metals and an insoluble product; reacting the first leachate with a base to produce a first solid product comprising a first metal and a second leachate comprising ions of a second metal different from the first metal; and reacting the second leachate with the base to produce a second solid product comprising the second metal and a third leachate.

The invention discloses a magnesium carbonate crystal prepared based on hexamethylenetetramine and a preparation method thereof, and belongs to the technical field of magnesium carbonate materials. The preparation method comprises the following steps: dissolving urea and magnesium chloride, adding hexamethylenetetramine, oscillating in water bath ultrasonic to fully react, then transferring the reaction system into a hydrothermal reaction kettle to perform hydrothermal reaction, and washing and drying a reactant to obtain magnesium carbonate crystals. According to the invention, magnesium chloride and urea are taken as raw materials, hexamethylenetetramine is taken as an additive, the nucleation-growth process is directionally regulated by the hexamethylenetetramine additive, and an optimized reaction process is adopted, so that the magnesium carbonate crystal with high purity, good crystallinity and an excellent pore structure is successfully synthesized; the prepared magnesium carbonate crystal has an optimized porous structure. According to the structure, the mass transfer efficiency is effectively improved, diffusion and transmission of substances in the material are facilitated, and the preparation method is simple and has wide application potential.

A method of making a material for capturing carbon dioxide from the earth's atmosphere, comprises producing an acid and a base with an electrochemical acid-base generator; dissolving a mineral in the acid to produce a mineral rich solution, separating silica from the mineral rich solution to form a silica depleted solution; adding a first portion of the base to the silica depleted solution to remove impurities by precipitation, adding a second portion of the base until ferrous hydroxide (Fe(OH)2) precipitates, then pausing base addition and removing the ferrous hydroxide precipitate from the solution. Then adding a third portion of the base to the iron-depleted solution to precipitate magnesium hydroxide (Mg(OH)2) and / or calcium hydroxide (Ca(OH)2). Then recovering a salt solution and directing the recovered salt solution to the electrochemical acid-base generator to produce a new acid and a new base. The magnesium hydroxide and / or calcium hydroxide may be used to capture and sequester carbon dioxide from a CO2-containing gas (e.g., air) by forming a carbonate or from the ocean by forming bicarbonate.

This invention offers a coupling system of copper slag recycling and CO2 mineralization process based on industrial solid waste. This system comprises the steps of obtaining copper slag, performing slag forming treatment, obtaining reforming slag, obtaining sponge iron, coupling the obtained reforming slag with a CO2 mineralization process based on industrial solid waste, and coupling the CO2 generated in the process of obtaining sponge iron with the CO2 mineralization process based on industrial solid waste. The system includes a slag forming treatment device, a secondary treatment device, a first coupling device, and a second coupling device. The invention can couple the recycling of copper slag with the existing CO2 mineralization process based on industrial solid waste. Various production lines can be organically integrated in a green and clean manner for both reforming slag and flue gas. At the same time, the selection range and acquisition mode of CO2 source are expanded for CO2 mineralization process based on industrial solid waste, and the engineering cost of CO2 mineralization process based on industrial solid waste is reduced.

The present disclosure provides a molded magnesium carbonate body including between 90-99.9 wt% magnesium carbonate formed into a plurality of uniform shapes having uniform sizes. Between 80-99.9 wt% of the molded magnesium carbonate body may crushed to a fine powder containing a plurality of particles having an average diameter or longest dimension for the plurality of particles between 0.5-100 µm when the molded magnesium carbonate body is subjected to crushing with a force of 100 N for at least 1 second. The present disclosure also provides a molding process for forming such molded magnesium carbonate bodies by suspending magnesium carbonate particles in an alcohol / water mixture having an alcohol:water ratio between 30:70 and 40:60 to form a uniform slurry, filling a mold having desired dimensions of the molded magnesium carbonate body with the slurry, and drying the slurry to form a solid molded magnesium carbonate body

The present disclosure relates to methods for producing hydrogen and calcium- or magnesium-bearing carbonates by capturing, converting, and storing carbon dioxide. The methods may include providing one or more calcium- or magnesium-bearing compounds; providing one or more water-soluble oxygenates; providing a plurality of catalysts; and reacting one or more calcium- or magnesium-bearing compounds and one or more water-soluble oxygenates with plurality of catalysts under conditions to produce hydrogen and calcium- or magnesium-bearing carbonates. The methods may include providing one or more calcium- or magnesium-bearing silicates; providing carbon monoxide; providing water vapor; and reacting one or more calcium- or magnesium-bearing silicates, carbon monoxide, and water vapor. The methods may include providing one or more calcium- or magnesium-bearing compounds; providing one or more water-soluble oxygenates; providing a catalyst; and reacting one or more calcium- or magnesium-bearing compounds and one or more water-soluble oxygenates with said catalyst.

The invention discloses a mixed mineral material and method for promoting long-term storage of sediment organic carbon, the material is composed of serpentine and magnesite according to a certain proportion, and the method comprises the following steps: 1) selecting mineral materials serpentine and magnesite as raw materials; (2) pretreating the serpentine and the magnesite; 3) uniformly mixing the pretreated serpentine and magnesite according to a certain proportion; 4) spreading the mixed mineral material on the surface of the sediment by a certain thickness; and 5) reacting the mixed mineral material with the sediment organic carbon to generate a stable magnesium carbonate mineral so as to realize in-situ long-term storage of the sediment organic carbon. The mineral material has the characteristics of environment friendliness, reasonable formula, convenience in use, ecological environment friendliness and the like. According to the method, in-situ long-term sequestration of the sediment organic carbon is realized through reaction of the mixed mineral material and the organic carbon, and a new thought is provided for assisting carbon neutralization and realizing in-situ carbon sequestration of the sediment in water ecological restoration engineering.

The application relates to a method and device for pyrolyzing heavy magnesium water and basic magnesium carbonate, the method comprising: heating the heavy magnesium water; wherein a vacuum treatment is adopted, and the vacuum degree of the vacuum treatment is controlled to perform a first-stage pyrolysis of the heavy magnesium water; the vacuum treatment is stopped according to the first temperature of the heavy magnesium water to perform a second-stage pyrolysis of the heavy magnesium water, and basic magnesium carbonate is obtained. In the first-stage pyrolysis, it is also an induction period of pyrolysis. The heavy magnesium water is heated, and a certain vacuum degree is reached in the pyrolysis process by using the vacuum treatment, the carbon dioxide partial pressure in the pyrolysis is reduced, the induction period of the pyrolysis is controlled, the pyrolysis temperature in the first stage is reduced, the reaction rate of the pyrolysis is accelerated, and the energy consumption is reduced.

A method of carbon mineralization includes exposing a solution including a plurality of metal salts and a surfactant to carbon dioxide at a pressure in a range from 300 to 700 pounds per square inch (PSI) to form a carbonated solution. The method further includes adding a base to the carbonated solution until the pH is above 10 to form a reaction mixture and reacting the reaction mixture to form mineral precipitates. The carbon dioxide reacts with the metal salts to form the mineral precipitates. The surfactant includes a tertiary amine including one alkyl group and two ethoxylate groups including two or more ethoxy units. The mineral precipitates include calcite, portlandite, brucite and halite. The mineral precipitates are in the form of particles having an average size in a range from 1 to 75 μm.

The invention relates to a bicarbonate production system and a bicarbonate production method. The bicarbonate production system according to the present disclosure comprises: a removal device that removes an acidic substance in a first exhaust gas to produce a second exhaust gas; a bicarbonate production device that produces bicarbonate by reacting carbon dioxide in at least one of the first exhaust gas and the second exhaust gas with an alkaline earth compound in the reaction solution; and a pH sensor that detects the pH of the reaction solution. The introduction amount of the first exhaust gas and the introduction amount of the second exhaust gas to be introduced into the bicarbonate production apparatus are controlled so that the pH of the reaction solution detected by the pH sensor is maintained within a predetermined target pH range.

A hydrogencarbonate generation system according to the present disclosure includes a removing device that removes acidic substances in a first exhaust gas to generate a second exhaust gas, a hydrogencarbonate producing device that reacts carbon dioxide in at least one of the first exhaust gas and the second exhaust gas with an alkaline earth compound in a reaction solution to produce hydrogencarbonate, and a pH sensor that detects the pH of the reaction solution. An introduction amount of the first exhaust gas and an introduction amount of the second exhaust gas that are to be introduced into the hydrogencarbonate producing device are controlled to maintain the pH of the reaction solution detected by the pH sensor within a predetermined target pH range.

The invention belongs to the technical field of solid waste treatment, and provides a resourceful treatment method for solid waste of an electrolytic aluminum factory. According to the method, sodium hypochlorite is added in the wet grinding process, so that cyanide in the solid waste of the electrolytic aluminum factory is oxidized into CO2 and N2, environmental pollution and safety risks caused by the solid waste of the electrolytic aluminum factory are thoroughly eliminated, and harmlessness is achieved. The fluorine source is used as the leaching agent, so that the molecular ratio of the cryolite can be adjusted, and the quality of the regenerated cryolite is improved; hydrochloric acid is used as a leaching agent, so that strict requirements on sulfur content of recycled electrolyte in an electrolytic aluminum factory are met. And meanwhile, no waste gas is generated by the resourceful treatment method. According to the resourceful treatment method, energy consumption is low, no acid mist is released in the operation process, the lithium yield is high, the lithium content in the solid waste of the electrolytic aluminum factory can be reduced to 0.025% from 0.4-2%, cryolite and carbon powder are obtained after filter residues obtained after lithium extraction through leaching are rinsed, separated and dried, and comprehensive resourceful utilization is achieved.

The application discloses a magnesium-carbon dioxide battery positive electrode material and a preparation method thereof, and a chemical composition general formula of the magnesium-carbon dioxide battery positive electrode material is Mo 4 / 3 R 2a / 3B2-V R’ , wherein V R’ represents a vacancy of R', R is one or more of Lu, Dy, Er, Ho and Tb, R' is Y or Sc, and 0.1<=a<=0.9; the material is obtained by calcination firstly to obtain Mo 4 / 3 R' 2 / 3‑2a / 3 R 2a / 3AlB2, then etching agent is added to selectively etch transition metals (Y or Sc) and Al, so that a ternary transition metal boride, i.e., a positive electrode material of a magnesium-carbon dioxide metal battery, is obtained. The preparation method is simple, and a process is easy to control. The positive electrode material of the magnesium-carbon dioxide metal battery prepared by the method has excellent catalytic performance, low overpotential and long cycle life, and can efficiently and stably absorb and utilize carbon dioxide.