12 results about "Magnesium carbonate hydroxide" patented technology

This invention belongs to the field of glass technology and relates to a high-temperature resistant structural glass material, its preparation method, and its applications. The glass is composed of the following components by mass percentage: 60%-70% silicon dioxide, 5.5%-11% boric acid, 0.1%-5% aluminum hydroxide, 0%-3% potassium nitrate, 5.5%-13% potassium carbonate, 0%-12% sodium carbonate, 0.1%-4% calcium carbonate, 0%-2% calcium fluoride, 0%-1% lithium carbonate, 0%-2% basic magnesium carbonate, 0.1%-1% titanium dioxide, 0%-2% zirconium dioxide, and 0%-1% cerium dioxide; the total mass percentage of potassium nitrate, potassium carbonate, sodium carbonate, and lithium carbonate does not exceed 22%. This structural glass possesses a high softening temperature, a suitable coefficient of thermal expansion, high-temperature resistance, thermal shock resistance, and processing performance, making it suitable as a structural material for optoelectronic devices.

The application belongs to the field of high polymer materials, and particularly discloses a modified basic magnesium carbonate and a PA12 composite material and a preparation method thereof.The preparation method of the modified basic magnesium carbonate comprises the following steps: adding sodium carbonate and magnesium chloride into a sodium hydroxide solution to perform a water bath reaction to obtain the basic magnesium carbonate; adding the basic magnesium carbonate and acrylic acid into deionized water to perform a water bath reaction to obtain acrylic acid modified basic magnesium carbonate; and adding the acrylic acid modified basic magnesium carbonate, glycidyl methacrylate and an initiator into an organic solvent aqueous solution to perform a water bath reaction to obtain the modified basic magnesium carbonate.The modified basic magnesium carbonate prepared by the application can decompose and absorb heat at high temperature, release water vapor and carbon dioxide and other non-combustible gases, dilute the oxygen concentration on the surface of the combustion object, and reduce the temperature of the combustion area, so as to play a role in flame retardation.In addition, the magnesium oxide produced by decomposition covers the surface of the material to form a protective layer, and further prevents the combustion.

The invention belongs to the technical field of mineral processing treatment, and particularly discloses porous magnesium oxide based on dolomite and a macro-quantity preparation method of the porous magnesium oxide. The method comprises the following steps: crushing dolomite ore, and carrying out solid-phase reaction on the crushed dolomite ore and ammonium dihydrogen phosphate to obtain a mixture containing MgNH4PO4 and calcium phosphate; then selectively dissolving out magnesium in the mixture by using an acetic acid solution to obtain magnesium-rich filtrate and calcium hydrophosphate filter residues; mixing the magnesium-rich filtrate with ammonium bicarbonate for reaction to obtain basic magnesium carbonate precipitate and an ammonia-containing solution; sequentially carrying out first heat treatment and second heat treatment on the basic magnesium carbonate precipitate to obtain the porous magnesium oxide. According to the method, the porous magnesium oxide is successfully prepared on a large scale by taking the dolomite with large reserves and low cost as a direct raw material; the porous magnesium oxide also has the advantages of hierarchical pore structure and large specific surface area.

This invention discloses a method for preparing basic magnesium carbonate from calcium carbide production purification ash, belonging to the field of solid waste resource utilization. The method mainly utilizes carbon dioxide from the lime kiln gas in calcium carbide production to pressurize and carbonize the purified ash, obtaining high-concentration heavy magnesium water. This heavy magnesium water is then catalytically degassed to obtain high-purity wet basic magnesium carbonate. Furthermore, the waste heat from the lime kiln gas in calcium carbide production is used to dry the wet basic magnesium carbonate, obtaining basic magnesium carbonate powder. This technical solution utilizes the lime kiln gas from calcium carbide production in a site-specific manner, effectively treating waste with waste, and avoiding the traditional chemical method of using chemical reagents to treat purified ash from calcium carbide production to obtain basic magnesium carbonate. Simultaneously, the catalytic degassed treatment technology significantly improves the preparation efficiency and recovery rate of basic magnesium carbonate, providing a new solution for calcium carbide production purification ash.

The invention discloses an Mg3TiO5 microwave dielectric material and a preparation method thereof, and belongs to the field of microwave dielectric materials, the chemical formula of the microwave dielectric material is Mg3TiO5, the Q * f of the microwave dielectric material is 198000GHz, and the fluctuation of the microwave dielectric property within the range of-50 DEG C to 200 DEG C is less than or equal to 5%; the preparation method comprises the following steps: (1) proportioning MgO or basic magnesium carbonate with the purity of more than 99% and the particle size of 400-600nm and TiO2 according to product element composition to obtain initial powder; (2) carrying out ball milling, drying, sieving and presintering on the initial powder obtained in the step (1), and then carrying out secondary ball milling, drying and sieving; and (3) adding a polyvinyl alcohol solution into the powder obtained in the step (2) for granulation, then carrying out compression molding, and sintering the obtained green body in the air atmosphere of 1320-1440 DEG C to obtain the Mg3TiO5 microwave dielectric material.

The application belongs to the technical field of carbon dioxide adsorbents, and provides a magnesium oxide-based carbon dioxide adsorbent and a preparation method thereof. Basic magnesium carbonate is calcined to obtain magnesium oxide powder; the magnesium oxide powder is immersed in an alkali metal salt solution and then dried to obtain magnesium oxide powder loaded with alkali metal; the magnesium oxide powder loaded with alkali metal is immersed in a calcium nitrate solution and then sequentially subjected to drying, calcination and refinement treatment to obtain the magnesium oxide-based carbon dioxide adsorbent. The adsorbent of the application effectively improves the carbon dioxide adsorption capacity and cycle stability of the adsorbent through the mutual synergistic effect of magnesium oxide, sodium ions, potassium ions, manganese ions and calcium oxide and by controlling the proportion of each component and the process parameters, has high carbon dioxide removal rate, and has excellent cycle regeneration performance; the immersion of magnesium oxide in the alkali metal salt solution can further increase the pores of the adsorbent, which is conducive to the diffusion of carbon dioxide in the interior of the adsorbent.

The invention discloses a harmless and resourceful treatment method for manganese slag, which is characterized in that the subsequent manganese-magnesium separation difficulty is reduced by carrying out thermal refining on a manganese slag water washing solution, a manganese oxide product with higher purity and a basic magnesium carbonate product with higher purity can be obtained step by step, the additional value of the product is improved, and the operation cost is reduced; besides, based on the characteristic that the manganese slag washing slag contains iron and manganese, ammonia nitrogen and manganese are catalytically oxidized by adopting a curing agent, so that the stability of the manganese slag washing slag is ensured, and the aim of harmless treatment meeting the national standard requirement is fulfilled. The method provided by the invention has the advantages of simple overall process flow, less discharge of wastewater and waste residues, small environmental pollution, high added value of the obtained product, low overall operation cost and the like.

The present disclosure provides a method and system for electrochemically assisted seawater mineralization of CO2 for simultaneous hydrogen production and basic magnesium carbonate. The method comprises: separating an anode chamber and a cathode chamber by a selective ion exchange membrane, adding concentrated seawater to the cathode chamber, introducing CO2-containing gas into the cathode chamber or a mineralization reaction zone connected with the cathode chamber, generating OH ‑ and hydrogen by water electrolysis reaction, reacting OH ‑ with CO2 and Mg 2+ to form a solid precipitate of magnesium-based compounds; in the anode chamber, a chlorine evolution reaction occurs to produce chlorine gas as a byproduct; hydrogen produced in the cathode is separated from the electrolyte in a gas-liquid separator, and the hydrogen is condensed, dried, deoxygenated and purified to obtain hydrogen gas product; the cathode effluent containing solid precipitate is separated in a solid-liquid separation unit, and the separated wet solid is washed and dried to obtain basic magnesium carbonate product. The process of the present disclosure has high flexibility and can be adapted to various magnesium sources such as pure chemicals and industrial waste liquid.

The invention discloses a method for recovering valuable resources in manganese slag, which comprises the following steps: carrying out tempering, fractional precipitation of manganese and magnesium and selective oxidation on washing waste liquid of the manganese slag, and further recovering to obtain high-purity manganous-manganic oxide and high-purity basic magnesium carbonate products; a high-purity ammonium ferrous sulfate product is obtained through homogenization, alkali adjustment, sedimentation and recovery, and a ferrous salt solution capable of being internally circulated is obtained through further alkali adjustment and iron precipitation; the washing waste residues are subjected to catalytic oxidation by adopting a curing agent, so that the washing waste residues are harmless, and dilute ammonia water is recovered; according to the characteristics of the washing waste residues and the washing waste liquid of the manganese residues, high-value recovery of valuable elements in the manganese residues is achieved through process optimization design, and the purpose of no emission of harmful waste water, waste gas, waste residues and the like is basically achieved. In addition, the method also has the advantages of simple overall process flow, low overall operation cost and the like.

The application discloses an oil well cement corrosion-resistant expanding agent and a preparation method thereof. The preparation method of the oil well cement corrosion-resistant expanding agent comprises the following steps: S1, mixing a jade processing waste powder after ball milling with hydrochloric acid, stirring and filtering to obtain a filtrate; S2, adjusting the pH value of the filtrate and heating to no precipitation, and separating by suction filtration to obtain a purified liquid; S3, adding ammonium bicarbonate into the purified liquid, drying after heating and separating by suction filtration to obtain basic magnesium carbonate; S4, mixing the basic magnesium carbonate with the jade processing waste powder and ball milling to obtain a powder; and S5, high-temperature calcining the powder, and rapidly cooling the obtained powder. The cooling mode of the method adopts a liquid nitrogen rapid cooling process, which can not only promote the internal stress of the CO2 corrosion-resistant material to be sufficient, but also achieve the purposes that the surface of the CO2 corrosion-resistant material is spherical, a large number of cracks are formed on the surface, and the particle size of the product is controllable.

The present invention relates to a method for directly capturing carbon dioxide from the air. The method for directly capturing carbon dioxide from the air according to the present invention is characterized by comprising the steps of: reacting seawater desalination concentrate with an alkali solution to form and separate magnesium hydroxide in a solid state; adding magnesium hydroxide to water to create a reaction solution and injecting carbon dioxide to precipitate hydromagnesite; heating the reaction solution to precipitate magnesium carbonate and basic magnesium carbonate and capturing carbon dioxide discharged from the reaction solution; injecting air containing carbon dioxide into the reaction solution to lower the pH; heating the reaction solution again to precipitate magnesium carbonate and basic magnesium carbonate and capturing carbon dioxide discharged from the reaction solution; and repeating the carbon dioxide injection step and the second capture step repeatedly and continuously after the second capture step.

The invention belongs to the technical field of inorganic material chemical industry, and discloses a preparation method of ball-flower-shaped basic magnesium carbonate. The preparation method comprises the following steps: mixing a magnesium raw material with water, introducing carbon dioxide gas, regulating and controlling temperature, pressure and stirring speed, and filtering after complete reaction to obtain a precursor solution; slowly mixing the mixed solution with an auxiliary agent solution, adding a mixture obtained by stirring into a reaction kettle, reacting at a regulated reaction temperature, and naturally cooling and crystallizing to obtain a solid-liquid mixed solution; and filtering, washing and drying to obtain the ball-flower-shaped basic magnesium carbonate. The basic magnesium carbonate prepared by the method is of a ball-flower-shaped structure with good crystallinity, the diameter is adjustable within 2-15 microns, the purity is 99% or above, the specific surface area is high, the pore structure is rich, the dispersity is good, and the basic magnesium carbonate can be applied to the fields of flame retardant additives, adsorption, catalysis, medicine and the like.