443results about "Magnesium carbonates" patented technology

The invention discloses a magnesium-based cobalt precipitation agent and a preparation method and application thereof, and relates to the technical field of composite materials. The method comprises the following steps: performing calcination dissociation, enhanced leaching, carbonization separation, efficient pyrolysis, solid-liquid separation, drying and calcination on first magnesium ore to obtain active magnesium oxide; the second magnesium ore is subjected to calcination dissociation, hydration impurity removal, solid-liquid separation and low-temperature calcination, and then high-purity magnesium oxide is obtained; performing series-parallel modification on active magnesium oxide and high-purity magnesium oxide to obtain a magnesium-based cobalt precipitation agent; the mass ratio of the active magnesium oxide to the high-purity magnesium oxide is 1: (2-10), the modifier is quaternary ammonium salt organic powder, and the addition amount of the modifier is 0.02-1% of the total mass of the magnesium oxide. The magnesium-based cobalt precipitation agent prepared through the method is high in activity, has the advantages of being high in efficiency, low in price, low in unit consumption, environmentally friendly and the like in the aspect of nickel and cobalt precipitation through copper-cobalt ore and laterite-nickel ore wet smelting, and can greatly reduce the material cost in the nickel cobalt hydroxide production process.

The invention relates to a method for sequestering CO2, which comprises the steps of providing a starting product comprising at least 20% by mass of one or more of the following components, ultramafic rocks, weathering products of ultramafic rocks, olivine and / or industrial waste materials, homogenizing the starting product and hydro-thermally treating the homogenized starting product in a heat treatment apparatus at a temperature of above 100° C. for at least 24 hours. Furthermore, the converted starting product is dewatered of bound water by means of thermal treatment and / or reaction grinding. Subsequently, the product thus obtained is contacted with CO2, wherein the latter is bound.

The invention relates to the technical field of mineral processing, in particular to a method for separating calcium and magnesium components of calcined dolomite based on carbon dioxide. The calcined dolomite comprises magnesium oxide and calcium oxide, and the method comprises the following steps: digesting the calcined dolomite and water to obtain a calcined dolomite suspension; carrying out bubbling treatment on the raw material gas containing carbon dioxide under a preset condition to obtain fine raw material bubbles; carrying out carbonization reaction on the fine raw material bubbles and the calcined dolomite turbid liquid to obtain a mixed turbid liquid; and carrying out solid-liquid separation on the mixed turbid liquid to respectively obtain calcium carbonate and a magnesium-containing liquid phase. According to the method, raw material gas containing carbon dioxide is subjected to bubbling treatment to obtain fine raw material bubbles, then the fine raw material bubbles and calcined dolomite turbid liquid are promoted to be subjected to gas-liquid-solid three-phase carbonization reaction, and the separation effect of calcium and magnesium components of the calcined dolomite turbid liquid can be improved under the harmless condition; the grades of the final calcium carbonate and magnesium oxide are respectively over 98 percent.

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 provides a dolomite roasting method, a carbonization method, a calcium-magnesium separation method and a comprehensive utilization method. The comprehensive utilization method of dolomite comprises the following steps: performing dolomite roasting on dolomite powder to obtain calcined powder; sequentially carrying out digestion treatment and aging treatment on the calcined white powder to obtain an aging solution; carrying out carbonization treatment on the aging solution to obtain a carbonization reaction solution; carrying out solid-liquid separation on the carbonization reaction liquid to obtain heavy magnesium water and a first solid isolate; carrying out pyrolysis treatment on the heavy magnesium water to obtain pyrolysis reaction liquid; carrying out solid-liquid separation on the pyrolytic reaction liquid to obtain decomposition liquid and a second solid isolate; carrying out magnesium carbonate roasting on the second solid isolate to obtain magnesium oxide; and carrying out reduction treatment on the magnesium oxide to obtain magnesium metal and magnesium aluminate spinel. According to the invention, comprehensive utilization of dolomite resources is realized, no waste residue or waste gas is discharged, a main product is magnesium metal, and byproducts are light calcium carbonate, magnesium aluminate spinel and solid carbon dioxide.

The invention provides a resource comprehensive utilization method of secondary aluminum ash. The method comprises the following steps: mixing secondary aluminum ash and an alkaline reactant, calcining, and collecting a first product and CO2; carrying out alkaline leaching treatment and separation on the first product, and collecting a first filtrate and a first filter residue; the first filtrate is used for preparing alumina; mixing the first filter residue with a first ammonium salt solution for hydrolysis reaction, and collecting a second product and NH3; separating the second product, and collecting a second filtrate and a second filter residue; nH3 is added with water to prepare ammonia water, the ammonia water is added into the second filtrate for a reaction, a product obtained after the reaction is separated, and a second ammonium salt solution and magnesium hydroxide are collected; magnesium hydroxide is used for preparing magnesium oxide and / or magnesium hydroxide is dissolved in water and then CO2 is introduced to prepare micro-nano hydrated magnesium carbonate. According to the method, comprehensive utilization of aluminum and magnesium resources in the secondary aluminum ash can be achieved, resource waste is reduced, and pollution of the secondary aluminum ash to the environment is reduced.

The invention discloses a preparation method of a biocompatible porous material, and belongs to the technical field of biological materials and functional materials. The technical problem that an existing porous material is poor in biocompatibility due to the fact that a porous structure is formed by using strong acid or a toxic solution is solved. According to the technical scheme, the preparation method comprises the steps of self-assembly of a two-dimensional material and microcrystal particles, sectional temperature control drying treatment, dissolution treatment and vacuum freeze drying. The method has the beneficial effects that by utilizing a microcrystal dissolution differentiation technology, the precise construction of a porous structure is realized under the condition that strong acid or toxic solution is not used, and harmful chemicals are not used, so that the biocompatibility and the biological activity of the material are reserved.

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

Systems and methods of producing magnesium carbonate from a mineral waste stream are described herein. The methods include receiving and contacting a mineral waste stream having a solid fraction having magnesium and a carbon dioxide stream at a reactor unit. Carbon dioxide present in the carbon dioxide stream dissolves in the liquid fraction of the mineral waste stream to produce a carbonic acid solution that leaches the magnesium from the mineral grains of the solid fraction. The methods also include directing at least a portion of the solid fraction of the pulp from the reactor unit to a cavitation unit to undergo cavitation, the cavitation inhibiting the formation of a passivation layer on the mineral grains of the solid fraction. After undergoing cavitation, a reactor product stream is directed to a separator unit to separate a liquid fraction therefrom into an aqueous phase stream comprising magnesium carbonate.

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 present invention relates to a method for producing light magnesium carbonate and co-producing calcium carbonate by sequestering carbon dioxide using magnesium reduction slag, acidic ammonium salt solution and magnesium reduction slag are added to leaching reactor, stirring and controlling pH to be 8.5-10.5, after solid-liquid separation, the solution is passed into a precipitation reactor, and industrial flue gas is passed into stirring reaction, until the system pH drops to 8, solid-liquid separation, the obtained mother liquor is used as a leaching liquid to repeatedly extract the same batch of magnesium slag, and then the mother liquor obtained after repeated extraction is used as a leaching liquid to extract multiple batches of magnesium slag, until the magnesium ion concentration in the mother liquor is greater than 0.1M, solid-liquid separation, industrial flue gas is passed into and pH is controlled to be 7.3-8.5, solid-liquid separation after reaction, ammonia is added to the obtained mother liquor and industrial flue gas is passed into, the system pH is controlled to be 9-9.5, and finally solid-liquid separation, drying, obtain light magnesium carbonate. The method is low in cost, can achieve zero emission and high value application of magnesium reduction slag, and has strong operability and is easy to realize industrialization.

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.

The present invention relates to a process and plant for reacting carbon dioxide with an alkali metal to form an alkali metal carbonate precipitant. The process and plant including a breaking step in which a slurry feed is broken down and forms an aqueous suspension, and a contacting step in which feed gas including carbon dioxide is contact with the suspension to form an alkali metal carbonate. The breaking and contacting steps are carried out progressively.

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.