491 results about "Magnesium salt" patented technology

The invention belongs to the technical field of organic pollution treatment, and relates to a biochar-LDH-nZVI-GO composite material for organic pollution remediation and a preparation method and application thereof.The preparation method comprises the steps that graphene oxide is ultrasonically dispersed in deionized water, magnesium salt and aluminum salt are added to form uniform suspension liquid, then the uniform suspension liquid is mixed with biochar suspension liquid, and the biochar-nZVI-GO composite material is obtained; carrying out pH (Potential of Hydrogen) regulation and a hydrothermal crystallization reaction, so as to prepare a biochar-Mg / Al-LDH-GO compound; and dispersing the compound in an organic solvent, sequentially adding FeSO4. 7H2O and a NaBH4 solution in an inert atmosphere to carry out a reduction reaction, and finally washing and drying to obtain the biochar-LDH-nZVI-GO composite material. The material shows high-efficiency removal capacity on various organic pollutants such as trichloroethylene, chlorobenzene and polychlorinated biphenyl, is suitable for high-efficiency green remediation of organic pollutants in soil and water, and has good popularization and application prospects.

The invention discloses a lanthanum-doped CuMgAl catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the lanthanum-doped CuMgAl catalyst comprises the following steps: adding a copper salt, a magnesium salt, an aluminum salt and a lanthanum salt into water to obtain a first solution; adding a precipitator into water to obtain a second solution; adding the second solution into the first solution to adjust the pH value to 10.5 to obtain a mixed solution, stirring the mixed solution to generate a co-precipitation reaction, after the reaction is completed, carrying out aging treatment to promote growth and structure ordering of layered double hydroxide crystals, and then carrying out calcination treatment to convert a layered double hydroxide precursor into an oxide, thereby obtaining the layered double hydroxide. And the lanthanum-doped CuMgAl catalyst is obtained. The lanthanum-doped CuMgAl catalyst prepared by the preparation method disclosed by the invention has excellent activity and stability.

The invention relates to a preparation method of a rice leavening with a scalp care effect and a product and application thereof, the preparation method comprises the following steps: mixing a rice raw material, a plant raw material, water, a magnesium salt, a sodium salt and Tween, sterilizing to obtain a fermentation medium, inoculating a compound microbial agent into the fermentation medium, and fermenting to obtain the rice leavening with the scalp care effect. After the fermentation liquid is finished, sterilizing and filtering to obtain a rice leavening; wherein the compound microbial agent comprises a first microbial strain and a second microbial strain; the strains in the first microbial strain comprise a combination of streptococcus thermophilus, bifidobacterium breve and a plant lactobacillus YK-L002 strain; and the second microbial strain comprises a trichosporon YK-S004 strain. According to the invention, specific strains are subjected to compounding and combined fermentation, and the fermentation product filtrate obtained after fermentation treatment of four bacteria has excellent hair care and nourishing effects, and can effectively condition the scalp micro-ecological environment and nourish the hair quality.

The invention discloses a mine water fluorine removal agent and a preparation method and application thereof, and belongs to the technical field of wastewater treatment.The preparation method of the fluorine removal agent comprises the following steps that aluminum salt, calcium salt, magnesium salt and ferric salt are added into water to be stirred, then a chelating agent, a hydroxy carboxylic acid compound and a dispersing agent are added, the mixture is heated to 40-60 DEG C to be stirred and dispersed, and heat preservation is conducted. The preparation method gets rid of the constraint of traditional calcium salt, introduces the chelating agent, the hydroxy carboxylic acid compound and the dispersing agent on the basis of controlling the compatibility of the materials and the synthesis reaction process, and utilizes the excellent fluorine ion adsorption performance and flocculation settling performance of the aluminum-calcium-magnesium-iron-based quaternary metal material to improve the fluorine ion adsorption performance of the aluminum-calcium-magnesium-iron-based quaternary metal material. Quaternary metals are assembled into a long-chain porous structure through chelation, the specific surface area and the pore volume are further increased, the contact area with fluorine ions in mine water is increased, and the porous structure adsorbs complexing groups to achieve the purposes of rapid coordination, strong adsorption, precise chelation, flocculating settling and efficient removal of fluoride in mine water.

The invention belongs to the technical field of magnesium ion batteries, and particularly relates to a magnesium ion battery electrolyte, a preparation method thereof and a magnesium ion battery. The invention provides a magnesium ion battery electrolyte. The magnesium ion battery electrolyte comprises a magnesium salt electrolyte, an amine organic solvent and an imidazole organic solvent. According to the magnesium ion electrolyte, the imidazole and amine organic solvents are used as the mixed cosolvent of the magnesium ion electrolyte, so that the electrolyte magnesium salt can be effectively dissolved, and the problems of decomposition and passivation of the electrolyte solvent and corrosion of a magnesium metal negative electrode can be effectively solved; the amine and imidazole co-soluble magnesium ion electrolyte provided by the invention can realize reversible deposition and dissolution of a magnesium metal negative electrode under the condition of a wide temperature range of-30 to 80 DEG C, and can be applied to a rechargeable magnesium battery.

Provided are a wide-temperature-range solid-state electrolyte, a preparation method thereof and use thereof in solid-state lithium metal batteries. The preparation method includes: dissolving a lithium salt and a magnesium salt in a solvent to obtain a mixed salt solution; and mixing the mixed salt solution with an ammonia fluoride solution, subjecting a resulting mixture to reaction, and subjecting a resulting reaction product to centrifugation, washing, and drying in sequence to obtain magnesium-doped lithium fluoride nanoparticles; and mixing the magnesium-doped lithium fluoride nanoparticles, a liquid plasticizer, a polymer monomer and a thermal initiator to obtain a liquid precursor, and subjecting the liquid precursor to curing to obtain the wide-temperature-range solid-state electrolyte, where the polymer monomer is a mixture of ethoxylated trimethylolpropane triacrylate and hexafluorobutyl methacrylate.

The present application provides a kind of variable color 3D printing material based on inulin complex, the variable color 3D printing material includes inulin, calcium salt, magnesium salt and zinc salt.The variable color 3D printing material of the present application significantly improves the gelation performance of pure inulin, greatly shortens its gelation time, significantly improves the 3D printing formability, printing precision and water holding capacity of pure inulin gel, has rich variable color and color stability.

The invention provides an EICP-based sandy soil curing agent, a sandy soil curing method and application thereof, and relates to the technical field of rock and soil reinforcement. The sandy soil curing agent comprises a urease solution, a cementing fluid and a hydrophobic polymer, wherein the urease solution is prepared by salting out a urease crude extract and then carrying out solid-liquid separation; the cementing liquid comprises calcium salt, magnesium salt and urea. The curing agent is convenient to use, the solidified soil body is stable in structure, and the curing agent has excellent disintegration resistance. The invention further provides a sandy soil curing method and application of the sandy soil curing agent or the sandy soil curing method.

The utility model relates to a device for recovering magnesium salt tablets from industrial magnesium salt-containing wastewater, which is characterized in that magnesium salt in industrial waste acid is recovered by adopting an evaporation mode, after the magnesium salt-containing wastewater is filtered and precipitated, a supernatant solution enters an evaporation system to be evaporated and concentrated, a concentrated solution is recovered, cooling and flaking are carried out, and flaked magnesium salt is collected. The evaporation system comprises an evaporator and a condenser. The evaporation system increases the evaporation speed by enhancing evaporation; through the characteristic of normal-pressure evaporation, the problems that the boiling point is increased due to the fact that the solubility of the solution is increased, and energy consumption is increased due to the fact that the requirement for the quality of a heat source is improved in a traditional boiling evaporation process link and the evaporation system works unstably are solved. Compared with the prior art, the energy utilization efficiency is improved, the energy consumption is reduced, the operation stability of the system is improved, and the risk that the evaporator is scaled and blocked is avoided.

The invention relates to a magnesium salt modified charcoal soil conditioner and a preparation method thereof, and belongs to the technical field of soil improvement. The invention provides a preparation method of a magnesium salt modified charcoal soil conditioner. The preparation method comprises the following steps: (1) preparing a reactant from crop straws and a magnesium chloride solution; (2) preparing a modified reactant from the reactant and a sodium hydroxide solution, and cracking to obtain magnesium salt modified biochar; and (3) mixing magnesium oxide with the magnesium salt modified biochar to obtain the magnesium salt modified biochar soil conditioner. The magnesium salt modified biochar soil conditioner prepared according to the method disclosed by the invention can remarkably improve nitrogen and phosphorus nutrient indexes such as quick-acting phosphorus, ammonia nitrogen and quick-acting nitrogen in soil, can effectively improve acid soil, and also can improve the growth traits and yield of crops.

The invention discloses a flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The desulfurization composite synergist is prepared from the following raw materials in parts by weight: 5 to 10 parts of citric acid, 20 to 30 parts of binary acid, 15 to 20 parts of sodium formate, 15 to 20 parts of sodium salt, 12 to 18 parts of magnesium salt, 2 to 4 parts of surfactant, 2 to 4 parts of pH buffering agent and 5 to 10 parts of calcium oxide. The preparation method comprises the following steps: carrying out a ring-opening reaction on 3-(2-aminoethylamine) propyl methyl dimethoxy silane and glucolactone to obtain an intermediate 1, and then carrying out a two-step quaternization reaction to synthesize the novel surfactant. The prepared desulfurization composite synergist has a good desulfurization effect and is suitable for limestone-gypsum wet flue gas desulfurization.

The invention belongs to the technical field of preparation of electrocatalytic oxygen evolution catalysts, and particularly discloses a doping regulation type ruthenium-iridium-based electrocatalytic oxygen evolution catalyst and a preparation method thereof.The preparation method comprises the following steps that S1, ruthenium salt, iridium salt and doped metal salt are dispersed in a solvent, the doped metal salt is selected from one or more of yttrium salt, strontium salt, potassium salt, calcium salt, magnesium salt, scandium salt, gallium salt and aluminum salt; s2, preparing a precursor mixture; s3, performing heat treatment to obtain a solid product; and S4, washing and drying to obtain the metal element doped ruthenium-iridium-based electro-catalytic oxygen evolution catalyst. According to the doping regulation type ruthenium-iridium-based electro-catalysis oxygen evolution catalyst and the preparation method thereof, the process is simple, the universality is high, doping of multiple elements can be achieved only by replacing the doped metal salt, and the obtained catalyst has excellent acidic water electrolysis oxygen evolution activity and long circulation stability; and excessive phase splitting of the Y element and excessive lattice distortion of other elements can be avoided.

A carbon sequestration mineral admixture, and a preparation method and device therefor. The method for preparing the carbon sequestration mineral admixture comprises: providing crushed solid waste; providing an activating liquid and a catalytic liquid, one or both of which is optionally in the form of micro-droplets; and contacting and reacting the activating liquid, the catalytic liquid, flue gas containing carbon dioxide, and the crushed solid waste to obtain a carbon sequestration mineral admixture, the contacting optionally being carried out under the action of an external mechanical force, wherein the activating liquid comprises one or more of a magnesium salt, an ammonium salt, an organic amine and a lower alkanol serving as an activating agent, and the catalytic liquid comprises carbonate ions and / or bicarbonate ions serving as a catalyst. The accelerated carbonization method has the advantages of a high carbonization efficiency, simple operation, and also being capable of achieving a high degree of carbonization and significantly increasing the added value of a carbonization product.

The application discloses magnesium modified straw biochar as well as a preparation method and application thereof, and belongs to the technical field of bio-adsorption materials. The preparation method of the magnesium modified straw biochar comprises the following steps: after straw is immersed in a magnesium salt solution (the concentration of the magnesium salt solution is 0.05-0.5 mol / L) and carbonized, the magnesium modified straw biochar is obtained. The magnesium modified straw biochar prepared by the application has a high specific surface area and rich surface functional groups, can effectively adsorb phosphorus in sewage, and realizes effective removal of phosphorus in eutrophic water bodies.

The invention discloses a limestone-gypsum wet flue gas desulfurization composite synergist and a preparation method thereof, and relates to the technical field of flue gas desulfurization. The limestone-gypsum wet flue gas desulfurization composite synergist is prepared from the following raw materials in parts by weight: 15 to 18 parts of organic acid, 5 to 8 parts of oxidation catalyst, 8 to 10 parts of sodium salt, 5 to 10 parts of magnesium salt, 12 to 15 parts of surfactant, 5 to 8 parts of organic acid alkali metal salt and 4 to 5 parts of dispersing agent. The preparation method comprises the following steps: reacting 2-dodecene-1-yl succinic anhydride with N, N-dimethyl ethylenediamine to generate a monoamide compound, reacting the monoamide compound with epoxy chloropropane to generate a quaternary ammonium salt compound, and reacting the quaternary ammonium salt compound with sodium sulfanilate to generate the surfactant. The limestone-gypsum wet flue gas desulfurization composite synergist prepared by the invention can promote dissolution of calcium carbonate, and shows good desulfurization efficiency.

The invention discloses a preparation method of an AAO / ZnMgAl-LDHs corrosion-resistant composite coating on an aluminum alloy surface, and belongs to the technical field of aluminum alloy surface protection treatment.The preparation method comprises the steps that firstly, an aluminum alloy base material is pretreated, then sulfuric acid and tartaric acid are mixed to prepare an anodic oxidation electrolyte, the treated aluminum alloy base material is placed in the electrolyte to be subjected to an electrified reaction to form an AAO film, and then the AAO film is subjected to heat treatment; and dissolving urea, magnesium salt and zinc salt in deionized water, adjusting the pH value to prepare an LDHs prefabricated solution, placing the aluminum alloy substrate with the AAO film in the LDHs prefabricated solution for in-situ growth, and finally washing and blow-drying to obtain the AAO / ZnMgAl-LDHs composite coating. The method is simple in preparation process, easy to operate, economical, environmentally friendly and good in hole sealing effect, the prepared AAO / ZnMgAl-LDHs composite coating is uniform and compact, the corrosion resistance of the aluminum alloy can be remarkably improved, the surface protection performance of the aluminum alloy can be effectively enhanced, and reliable guarantee is provided for application of the aluminum alloy in a complex environment.

The invention discloses a controlled-release potassium-magnesium fertilizer as well as a preparation method and application thereof, and relates to the technical field of controlled-release fertilizer production. Potassium magnesium crude salt recovered through salt lake carnallite flotation crystallization is used as a core raw material, high-roundness modified potassium magnesium salt composite particles are constructed through extrusion master batch forming, roller wet amplification, centrifugal polishing shaping and micropore filling and sealing, and the controlled-release potassium magnesium fertilizer is prepared through coating. The problems that potash fertilizer particles prepared through traditional extrusion granulation have many edges and corners and are not prone to film coating are solved through a multi-stage granulation process, secondary granulation is conducted through heterogeneous fine powder materials, surface micropores are filled, the surface smoothness of the particles is greatly improved, meanwhile, the influence of potassium ions on film forming is isolated, and the potassium fertilizer has the good application prospect. According to the finally prepared controlled-release potassium-magnesium fertilizer, a nutrient release curve is precisely regulated and controlled through the controlled-release film layer, double-nutrient continuous supply of crops with high potassium and high magnesium requirements is achieved, the potassium and magnesium deficiency symptoms of the crops are reduced, the crop quality is improved, and a core technical support is provided for high-value utilization of salt lake potassium ore resources and green quality improvement of the crops.

Provided is a cosmetic containing ascorbic acid and / or a salt thereof, which has excellent stability and reduced irritation to the skin. The cosmetic according to the present invention contains ascorbic acid and / or a salt thereof, ultrapure water, and an antioxidant, and the salt of ascorbic acid is at least one selected from the group consisting of a trimethylamine salt, a triethylamine salt, a monoethanolamine salt, a triethanolamine salt, a pyridinium salt, an arginine salt, an ammonium salt, a sodium salt, a potassium salt, a calcium salt, a magnesium salt, and an aluminum salt of ascorbic acid. The antioxidant is glutathione or sodium pyrosulfite, the pH of the cosmetic material is adjusted to 5.0-7.0, and the dissolved oxygen content of the cosmetic material is 0-5 mg / L.

The present application relates to thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with diaphosphorus pentoxide and zirconium oxide powder to obtain mixed powder; the mixed powder is put into a closed ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and mixed and ball milled; then a binder is added to the ball mill tank and ball milled; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is poured into a vibrating mold, pressed, and a die pressed blank is formed; the blank is put into a cold isostatic pressing machine and pressed and pressure maintained, to obtain a zirconium magnesium phosphate solid electrolyte target material blank after cold isostatic pressing; the zirconium magnesium phosphate solid electrolyte target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation, the furnace is naturally cooled to room temperature, to obtain a thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material. The composition of the solid electrolyte target material of the present application is uniform, facilitating thin film deposition.

Provided is dental glass having sufficient antibacterial properties through the inclusion of zinc. This dental glass contains 41-52 mass% of ZnO, 47-51 mass% of P2O5, 7 mass% or less of MgO, and 9 mass% or less of CaO. The fluorine content in the dental glass is preferably 3 mass% or less. The dental glass can be easily produced through a mixing step for mixing a starting material solution containing a zinc salt solution, a phosphate solution, an optional magnesium salt solution, and an optional calcium salt solution to form aggregates in the starting material solution, and a drying step for drying the aggregates to obtain a powder.

The present application relates to the technical field of manganese industry wastewater treatment device, and particularly discloses a comprehensive treatment method for electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen, which comprises the steps of removing manganese, solid-liquid separation of manganese removal wastewater, adding a precipitant for precipitation reaction, etc.; according to the characteristics of electrolytic manganese production wastewater containing manganese, ammonia nitrogen, calcium, magnesium, sulfate ions, etc., by fully utilizing the magnesium ions in water, more than 95% of the manganese ions and all the phosphate radicals in water can be selectively removed by using slurry of quicklime, without introducing excessive calcium ions, effectively reducing the dosage of magnesium salt and phosphoric acid reagent, reducing the treatment cost, so that the electrolytic manganese production wastewater containing medium and high concentration ammonia nitrogen with ammonia nitrogen > 50 mg / L can be completely treated to reach the standard by using the ammonium magnesium phosphate precipitation method, and the indexes of manganese, ammonia nitrogen, phosphate radical and pH value after treatment can all reach the first standard limit value requirement of the Comprehensive Sewage Discharge Standard (GB 8978-1996), and the manganese, ammonia nitrogen and magnesium resources in the wastewater can be recovered.

The application discloses a magnetic LDH biochar as well as a preparation method and application thereof, and belongs to the technical field of pollution prevention and control. The preparation method of the magnetic LDH biochar comprises the following steps: sequentially performing puffing treatment and pyrolysis carbonization treatment on iron-containing biomass to obtain magnetic biochar; mixing a magnesium salt solution and the magnetic biochar, and then performing hydrothermal reaction to obtain magnetic loaded iron-magnesium hydrotalcite biochar; mixing the magnetic loaded iron-magnesium hydrotalcite biochar and a nitrogen source, and then heating and doping to obtain the magnetic LDH biochar. The magnetic LDH biochar prepared by the application can adsorb dissolved oxygen around the carbon material, improve the mass transfer efficiency and dissolved oxygen utilization rate of microbial degradation of pollutants in the artificial wetland, rapidly enrich oxygen, increase the dissolved oxygen concentration of the water body, has the advantages of low energy consumption, difficulty in blocking, high nitrogen and phosphorus removal efficiency and the like, and when the magnetic LDH biochar is applied to the intermittent aeration artificial wetland, the nitrogen and phosphorus treatment performance of the artificial wetland can be effectively strengthened.

The invention relates to the field of activated carbon modification, in particular to high-hydrophobicity activated carbon and a preparation method thereof. According to the technical scheme, the method comprises the following steps: grinding a biomass material, adding a solution containing aluminum salt and / or magnesium salt, carrying out hydrothermal reaction to obtain a hydrothermal precursor, drying, carbonizing under the protection of inert gas to obtain a carbonized precursor, activating to obtain an activated precursor, and finally cleaning and drying to obtain the high-hydrophobicity activated carbon. Wherein in the activation step, water vapor is firstly introduced to carry out an activation reaction on the carbonized precursor, then plasma gas is circularly introduced to further react to obtain an activated precursor, and the plasma gas is acetylene and fluorinated benzene mixed plasma gas. The process is simple, complex equipment is not needed, the whole preparation process is short in period, low in cost and easy to industrialize, and the prepared activated carbon is high in hydrophobicity, good in oil absorbency and large in specific surface area.

The invention discloses a nickel-cobalt hydrometallurgy circulation process, and relates to the technical field of hydrometallurgy. On one hand, magnesium sulfate solution wastewater is converted into magnesium salt liquid to replace sodium hydroxide to be saponified with an organic phase, and meanwhile water for a production line can be saved. Carbon dioxide waste gas is recycled, and industrial waste gas resource conversion and reuse are achieved. On the other hand, high-efficiency recovery of cobalt and nickel in the waste liquid is realized by preparing a functional material: a resin filtering membrane with a coordination trap on the surface is formed by virtue of Zn < 2 + > coordination activation, and cobalt and nickel ions in the waste liquid are efficiently captured; the preparation method comprises the following steps: pre-synthesizing a dimethyl glyoxime functional ligand with carboxyl by taking dimethylglyoxime and bromoacetic acid as raw materials, and directly constructing MOF (Metal Organic Framework) with a dimethyl glyoxime group for chelating Ni < 2 + >; the prepared adsorption particles are subjected to secondary adsorption in waste liquid after passing through resin, so that cobalt and nickel ions in the waste liquid reach an extremely high recovery rate. The hydrometallurgy can achieve the effect of neither recovery nor circulation.

The invention discloses a chlorine-free environment-friendly bleaching agent for refined cotton. Comprising the following raw materials in parts by weight: 5-18 parts of peracetic acid, 10-30 parts of hydrogen peroxide, 5-8 parts of a sodium alginate / PEG4000 / modified cellulose nanowhisker compound, 1-5 parts of an organic acid catalyst, 0.05-0.5 part of a dipicolinic acid stabilizer, 0.01-0.1 part of a magnesium salt stabilizer, 2-10 parts of a pH buffer solution and 40-60 parts of deionized water. According to the chlorine-free environment-friendly refined cotton bleaching agent disclosed by the invention, efficient bleaching under mild conditions is realized through precise matching of a composite oxidation system and a multi-element synergistic protection system; meanwhile, the invention provides a preparation method and an application process of the bleaching agent, the bleaching agent is adaptive to the existing production line, and enterprise upgrading cost is reduced.

The invention relates to the technical field of biochar composite materials, in particular to a preparation method of a soil heavy metal remediation material and the material and application thereof. The preparation method comprises the following steps: S1, cleaning a biomass raw material, adding a hot alkali solution, filtering, sequentially washing filter residues with an acid solution and water, drying, crushing and sieving to obtain pretreated biomass; s2, soaking the pretreated biomass raw material in a magnesium salt solution, taking out the pretreated biomass raw material and drying the pretreated biomass raw material after the pretreated biomass raw material is fully infiltrated to obtain magnesium-doped biomass; s3, adding the magnesium-doped biomass into a mixed solution containing ammonium salt and phosphate, and adjusting the pH value for crystallization to obtain a composite material precursor; and S4, carrying out anaerobic calcination on the composite material precursor in an inert atmosphere to obtain the composite material. The soil heavy metal remediation material can perform in-situ solidification on multiple heavy metals such as Pb < 2 + > and Cd < 2 + >, is suitable for remediation of acid soil, can realize long-acting solidification, and effectively inhibits reactivation of heavy metal elements.

The invention discloses a silicon dioxide aerogel loaded magnesium oxide carbon dioxide adsorbent and a preparation method thereof, the carbon dioxide adsorbent takes silicon dioxide aerogel as a carrier and magnesium oxide as a carbon dioxide adsorption active component, and the magnesium oxide is loaded on the surface and in an internal pore structure of the silicon dioxide aerogel. The preparation method comprises the following steps: (1) preparing silicon dioxide aerogel by a sol-gel method; (2) soaking the silicon dioxide aerogel in a magnesium salt solution; (3) reacting the silicon dioxide aerogel loaded with the magnesium salt with soluble carbonate or aqueous alkali to convert into magnesium carbonate or magnesium hydroxide; and (4) performing high-temperature calcination to obtain a final product. According to the carbon dioxide adsorbent, the high specific surface area and porous structure of the silicon dioxide aerogel are combined with the carbon dioxide adsorption performance of magnesium oxide, the problem that the specific surface area is small due to the fact that magnesium oxide is prone to agglomeration is effectively solved, and the carbon dioxide adsorbent shows excellent performance in the field of carbon dioxide adsorption.

This invention provides a high-hygroscopic, water-free composite gel-type calcium and magnesium salt tablet and its preparation method, which is made from the following raw materials in parts by weight: 45-70 parts calcium and magnesium salt, 15-25 parts gum arabic, 3-15 parts mica powder, 2-12 parts polyethylene oxide, 0.5-2 parts sodium nitrite, and 2-30 parts gelatin. This tablet exhibits high hygroscopicity and excellent physical properties.

The invention provides an MgAl2O4 carrier as well as a preparation method and application thereof, and relates to the technical field of catalysts. The preparation method comprises the following steps: mixing urea, soluble aluminum salt, soluble magnesium salt, polydiene dimethyl ammonium chloride and water, and carrying out a hydrothermal reaction to obtain a precipitate; the molar ratio of the urea to the aluminum element in the soluble aluminum salt to the magnesium element in the soluble magnesium salt to the polydiene dimethyl ammonium chloride is 4.5: 2: 1: (1-2); and sequentially drying and calcining the precipitate, so as to obtain the MgAl2O4 carrier. The prepared MgAl2O4 carrier is used as a catalyst carrier to be used in a high-temperature and high-pressure methane and carbon dioxide dry reforming reaction, excellent stability is shown, and the MgAl2O4 carrier is evaluated for 230 h under the high-temperature and high-pressure conditions of 850 DEG C and 2 MPa, has no obvious difference in morphology before and after the reaction, has small change in specific surface area, and shows excellent mechanical strength and chemical stability.

The invention relates to the technical field of chemistry, in particular to a method for preparing magnesium hydroxide from a magnesium salt solution through a gaseous ammonia precipitation method, and the method is particularly suitable for extracting magnesium hydroxide from multi-component water mineral raw materials with high calcium content. The method comprises the following steps: in a nitrogen or inert gas atmosphere, introducing gaseous ammonia into a magnesium salt solution (comprising a multi-component water mineral raw material containing high-concentration calcium), and controlling the molar ratio of NH to Mg to be 2.5: 1-4: 1, so that magnesium hydroxide is precipitated and separated out; and after the precipitation process is completed, filtering and washing under the same atmosphere, and drying and crushing the obtained product. The method can realize one-step high-efficiency separation of magnesium hydroxide, and is also suitable for taking a multi-component natural mineral raw material with high calcium content as an initial solution.