248results about "Magnesium carbonates" patented technology

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.

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.

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 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.

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%.

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.

Systems and methods for sequestering carbon, evolving hydrogen gas, producing iron oxide as magnetite, and producing magnesium carbonate as magnesite through sequential carbonation and serpentinization / hydration reactions involving processed olivine- and / or pyroxene-rich ores, as typically found in mafic and ultramafic igneous rock. Precious or scarce metals, such nickel, cobalt, chromium, rare earth elements, and others, may be concentrated in the remaining ore to facilitate their recovery from any gangue material.

Methods for immobilizing carbon dioxide and producing stabilized amorphous alkaline earth metal carbonates are provided.

Disclosed herein are methods of capturing CO2 from a gas source using electrochemically-enhanced amine capture to form a concentrated CO2 vapor, followed by sequestering CO2 from the concentrated vapor in a sequestration step. The sequestration step includes contacting the concentrated vapor with an aqueous sequestration solution comprising ions capable of forming an insoluble carbonate salt, such that the aqueous sequestration solution comprises the CO2, electrochemically basifying the sequestration solution, thereby precipitating a carbonate solid, separating the carbonate solids from the aqueous sequestration solution or the surface of the mesh.

[Problem] There is a need for a device that synthesizes methane from hydrogen and carbon dioxide gases, but removes reaction heat and further reduces the progress and temperature of the reaction to improve the conversion rate of methane. [Solution] The present invention uses the powders of chemical heat accumulators magnesium hydroxide and magnesium carbonate as part of the fluid medium of a multi-stage fluidized bed to absorb and store the heat generated during the methanation reaction in the temperature range in which the methanation reaction proceeds, and is able to use the carbon dioxide gas generated from the magnesium carbonate as a raw material gas for the methanation reaction. When the magnesium oxide produced by heat absorption is discharged and regenerated in an external regeneration device, the stored heat is recovered, and the regenerated powder is reintroduced at the highest stage of the multi-stage fluidized bed at a temperature lower than the internal temperature of the device, so that the progress and temperature of the reaction can be reduced as the reaction gas rises through the device, and the conversion rate of the generated methane is improved.

To provide a fixation method of carbon dioxide which is excellent in fixation efficiency.SOLUTION: A fixation method of carbon dioxide of the disclosure includes: a step in which carbon dioxide in sea water is collected in a direct ocean capture (DOC) facility 1; a step in which mineral sources in sea water are concentrated in the DOC facility 1; a step in which the collected carbon dioxide is supplied to the mineral sources; a step in which carbon dioxide obtained at the outside of the DOC facility 1 is supplied to the mineral sources; and a step in which carbon dioxide collected in the DOC facility 1 and carbon dioxide supplied from the outside are mixed into the mineral sources to cause carbonation.SELECTED DRAWING: Figure 1

Systems and methods for sequestering carbon, evolving hydrogen gas, producing iron oxide as magnetite, and producing magnesium carbonate as magnesite through sequential carbonation and serpentinization / hydration reactions involving processed olivine- and / or pyroxene-rich ores, as typically found in mafic and ultramafic igneous rock. Precious or scarce metals, such nickel, cobalt, chromium, rare earth elements, and others, may be concentrated in the remaining ore to facilitate their recovery from any gangue material.

The application relates to the technical field of nanomaterials, and discloses monodisperse nanometer carbonate and a preparation method and application thereof. The method for preparing the monodisperse nanometer carbonate comprises the following steps: (1) performing acid-base neutralization reaction on a calcium source and / or a magnesium source and a surfactant in the presence of an organic solvent; wherein the calcium source is an alkaline calcium source, the magnesium source is an alkaline magnesium source, and the surfactant is an organic acid; (2) mixing water with the product obtained through the acid-base neutralization reaction in step (1); (3) performing first carbonization reaction on the mixture obtained through step (2) and a carbon source a; (4) performing second carbonization reaction on the product obtained through the first carbonization reaction and a carbon source b; wherein the carbon source a is different from the carbon source b. The monodisperse nanometer carbonate particles disclosed by the application are small in particle size, 1-5 nm in size, small in particle size, uniform in particle size distribution, monodisperse, and good in dispersity.

A process, apparatus, and cyclopropenimine (CPI) material for generating metal carbonates are disclosed. Generating the metal carbonates comprises reacting carbon dioxide (CO2) with CPI. Generating the metal carbonates also comprises forming a reaction mixture comprising water, metal cations, and a product of the reacting.

The application provides a porous spherical high-activity magnesium oxide and a preparation method thereof; the preparation method of the porous spherical high-activity magnesium oxide comprises the following steps: S1, obtaining a magnesium bicarbonate solution; S2, performing spray drying on the magnesium bicarbonate solution to obtain light magnesium carbonate solid powder, wherein the light magnesium carbonate solid powder has a hollow spherical structure; and S3, performing calcination on the light magnesium carbonate solid powder to obtain the porous spherical high-activity magnesium oxide. The high-activity magnesium oxide with a porous hollow spherical structure can be obtained, and the prepared magnesium oxide reaches the product standard of activity-180 in the standard HG / T 3928-2012 Industrial Active Light Magnesium.