127results 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.

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 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.

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 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 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.

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.

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.

The purpose of the present invention is to provide a hardened soileil cement having negative carbon emission, which can be effectively utilized in terms of strength, setting time, and / or water resistance, said hardened soileil cement being obtained by blending magnesium carbonate into soileil cement. Provided is a magnesium carbonate-blended soileil cement hardened body (SCMC) in which magnesium carbonate (MC) is blended in soileil cement (SC), the blending ratio of the magnesium carbonate to the total weight of the soileil cement (SC) and the magnesium carbonate (MC) being 10-35 wt%.

The present disclosure provides a method for extracting potassium bicarbonate from a mineral mixture. The method includes combining potassium chloride, sodium bicarbonate, and magnesium carbonate trihydrate in an aqueous solution. The aqueous solution is cooled to form Engel's salt comprising potassium bicarbonate magnesium carbonate tetrahydrate. Engel's salt is separated from the aqueous solution and leached with water to produce an aqueous potassium bicarbonate solution and magnesium carbonate trihydrate. The method may further include recycling at least a portion of the magnesium carbonate trihydrate produced from leaching Engel's salt back into the aqueous solution. The aqueous potassium bicarbonate solution can be processed to produce various potassium bicarbonate products.

Provided are a method for recycling and effectively using a waste emitted from a cement production process, in which calcium carbonate produced using a waste from a cement production process and hydrochloric acid produced in the process are effectively used for preparation of a vinyl chloride resin or the like, and a system that is useful for implementing the method. A method for reusing and recycling a waste generated from a cement production process, includes: electrodialyzing an aqueous solution containing potassium chloride to produce aqueous hydrochloric acid and an aqueous solution containing potassium hydroxide, the aqueous solution containing potassium chloride being obtained by washing chlorine bypass dust generated from a cement production step; adding a part of the aqueous hydrochloric acid to a calcium-containing waste to produce an aqueous solution containing a calcium ion; adjusting a pH of the aqueous solution containing a calcium ion and separating impurities; bringing carbon dioxide emitted from a cement production step into contact with the aqueous solution containing potassium hydroxide obtained through the electrodialysis to produce an aqueous solution containing potassium carbonate; and producing calcium carbonate and an aqueous solution containing potassium chloride using the aqueous solution containing a calcium ion having passed through the separation step and the potassium carbonate, in which a part of the aqueous hydrochloric acid obtained through the electrodialysis and the produced calcium carbonate are used for preparing a vinyl chloride resin or the like.

The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.

A water and carbon dioxide co-electrolysis system (1) comprises an anion exchange membrane (AEM) cell (2) having at least one AEM cell (2c) comprising a cathode (8), an anode (12), and an AEM membrane (16) separating the cathode from the anode, and an anolyte circuit (18) in which the AEM membrane (16) is separated from the anode, an anolyte is fluidly connected to the anode (12) via an anolyte inlet (14i) and an anolyte outlet (14o) of the anode (12). The CO2 and H2O co-electrolysis system further comprises a mineralization system (3) comprising a mineralization unit (27) connected to the anolyte circuit (18) and comprising a mineralized metal configured to react with carbonate and bicarbonate ions circulating in the anolyte circuit (18) to form a metal carbonate.

The invention discloses an integrated carbon sequestration method and device for a scraper drying crystallizer, and relates to the technical field of environment-friendly processes and equipment.The integrated carbon sequestration method comprises the steps that nanoscale alkaline mineral powder is added into waste water to form a mixed solution, and then the mixed solution is guided into an evaporative crystallization chamber of the scraper drying crystallizer. Alkaline mineral powder is introduced into a scraper drying crystallizer integrated carbon sequestration device, and is coordinated with vacuum and low-temperature environments and matched with a gas-liquid-solid three-phase turbulent flow environment formed by a centrifugal force field, so that dissolved-state CO escapes at low temperature and is subjected to mineralization reaction with the nanoscale alkaline mineral powder, stable carbonate precipitates are generated, and carbon sequestration is formed; and carbon sequestration and wastewater treatment are completed synchronously. According to the invention, COs as waste gas are converted into resources for utilization, and additional carbon capture and storage technologies are not needed.

The present invention relates to a CO ferromagnetic material processing method, comprising the steps of: preparing a starting product comprising at least 20% by mass of one or more of ultramafic rock, weathering products of ultramafic rock, olivine and / or industrial waste; homogenizing the starting product; and hydrothermally treating the homogenized starting product in a heat treatment device at a temperature above 100° C. for at least 24 hours. 2 The method further relates to a method for sequestering CO. The converted starting product is then dehydrated of bound water by thermal treatment and / or reactive grinding. 2 In contact with CO 2 and combine.

The invention discloses a controllable preparation method of multi-morphology nano magnesium carbonate and application of the multi-morphology nano magnesium carbonate in a synergistic flame-retardant-enhanced cable belting, and belongs to the technical field of inorganic functional materials and flame-retardant composite materials. Magnesium carbonate trihydrate nanofibers and flower clusters are compounded according to the mass ratio of 1: 1 to serve as a novel flame retardant applied to the field of cable wrapping, and the novel flame retardant is different from conventional halogen-free flame retardants such as mainstream magnesium hydroxide and aluminum hydroxide. Magnesium carbonate trihydrate is decomposed, absorbs heat and releases water and carbon dioxide at high temperature, and has a very good flame-retardant mechanism. The fibrous and flower-cluster-shaped nano magnesium carbonate trihydrate is prepared through process control instead of common granular magnesium carbonate. According to the compounded nano magnesium carbonate, on one hand, nano magnesium carbonate fibers can better play a role in strengthening and toughening (similar to crystal whiskers), and on the other hand, the specific surface area of a nano magnesium carbonate flower cluster surface is larger, so that gas adsorption and thermal decomposition are promoted, and the exertion of a flame-retardant effect is facilitated.

Described herein are compositions, methods of producing the compositions, and uses of the compositions for carbon dioxide sequestration. The compositions include a mixture of magnesium hydroxide, a metal hydroxide, and water to create a composition that is highly effective at sequestering carbon dioxide.

Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing solution is exposed to carbon dioxide to induce precipitation of a divalent ion carbonate salt.

The invention relates to the technical field of comprehensive utilization of phosphate tailings, in particular to a method for preparing high-activity MgO phosphorus-containing dolomite by utilizing the phosphate tailings, which comprises the following steps: carrying out flotation on the phosphate tailings to remove fluorocarbon apatite to obtain an intermediate product; and drying and crushing the intermediate product, adding an auxiliary agent, and calcining and activating under a CO2 partial pressure condition to obtain the phosphorus-containing dolomite containing high-activity MgO. According to the method, fluorapatite is removed through flotation, then calcination is carried out under the synergistic effect of the auxiliary agent and CO2 partial pressure, the activity of MgO in phosphorus-containing dolomite is effectively excited, and meanwhile decomposition of CaCO3 is inhibited. Therefore, the phosphate tailings are converted into a raw material with high additional value, the gelling activity of MgO and the small-size effect of the material can be fully exerted, and an effective way is provided for realizing bulk resource utilization of the phosphate tailings.

A method for producing carbonates using carbon dioxide, comprising the steps of: in a hydration tank (5), injecting carbon dioxide, in a form of fine bubbles, into a liquid containing a metallic catalyst to form carbonic acid; and in a carbonization tank (10), adding a solution of alkali metal hydroxide and an active calcium or magnesium compound to the carbonic acid to form calcium or magnesium carbonate. The method is characterized by cooling the carbon dioxide to be injected to the hydration tank (5); subjecting the liquid supplied to the hydration tank (5) to electromagnetic wave treatment; injecting the cooled carbon dioxide into the hydration tank (5) under pressure; wherein the metallic catalyst in the hydration tank (5) is a two-layer composite immobilized catalyst (17) made of at least two metals selected from the group consisting of: Co, Ni, Fe, Cu, and Zn, wherein the bottom layer of the composite catalyst has a developed surface in the form of metal agglomerates (174), and the upper layer has a developed surface in the form of dendrites (175).

The invention relates to a method for preparing light magnesium carbonate based on carbon dioxide mineralized serpentinite, which comprises the following steps: mixing serpentinite powder and ammonium sulfate for low-temperature synergistic activation to realize efficient conversion of magnesium element and produce byproduct ammonia gas at the same time; magnesium-silicon separation is achieved through water medium selective leaching, and active silicon slag is generated; accurately regulating and controlling the pH value, and selectively precipitating the iron oxide yellow byproduct to obtain pure magnesium liquid; cO2 is introduced into the pure magnesium liquid for a carbonation reaction, high-purity light magnesium carbonate is prepared, and precipitated mother liquor is obtained; and the closed-loop circulation of the ammonium sulfate reagent is realized through evaporative crystallization of the mother liquor. According to the method, all traditional waste residues are creatively converted into high-value products, the process economy is remarkably improved, meanwhile, the method has the outstanding advantages of being low in energy consumption, high in reagent recycling rate, environmentally friendly and the like, and a brand new technical path is provided for recycling of serpentinite solid waste and carbon emission reduction.

The present invention provides a method for recovering carbon dioxide and a method for producing carbonates. [Solution] An alkaline mixture A containing alkali metal ions (e.g., sodium ions) and water is brought into contact with a gas B containing carbon dioxide.

[Problem] An object of the present invention is to provide a carbonate immobilization device and a carbonate immobilization method that generate an alkaline-earth metal carbonate with less energy than concentration caused by heating and evaporating from treatment target water containing alkaline-earth metal ions. [Solution] The carbonate immobilization device of the present invention generates an alkaline-earth metal carbonate by concentrating treatment target water containing alkaline-earth metal ions using a membrane having a magnesium chloride blocking rate of 1.0% or more and 99.0% or less. By using the membrane having the magnesium chloride blocking rate of 1.0% or more and 99.0% or less, a part of the alkaline-earth metal carbonate generated when the treatment target water is concentrated passes through the membrane. From this, a decrease in a treatment target water treatment performance caused by adhesion of the carbonate, which is called scale, to a surface of the membrane can be suppressed, and carbon dioxide can be efficiently immobilized.

The present disclosure relates to a method of treating a material comprising a mineral, which comprises subjecting the material to radiant heating, for example a high flux and rapid radiant heating. In a particular form, the mineral is a hydrous mineral.

A sea water desalination process and plant wherein intake sea water is delivered to at least one reverse osmosis pass comprising at least one reverse osmosis membrane to produce permeate product water and brine; wherein at least a portion of the brine is delivered to at least one reactor 2 for the removal of carbonates-based chemical in the brine by precipitating calcium carbonate. The calcium carbonate is converted in a regenerator 10 to produce calcium hydroxide and carbon dioxide. This provides for a series of benefits in the overall cost efficiency and sustainability of the process / plant.