464 results about "Magnesium chlorate" patented technology

The invention relates to the technical field of agriculture, in particular to a plant nutrient solution for saline-alkali soil improvement and a preparation method thereof. The invention relates to a preparation method of a plant nutrient solution for improving saline-alkali soil. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides and acid modified calcium-based montmorillonite; preparing humic acid chelated calcium magnesium powder; preparing a binary compound; and preparing the plant nutrient solution. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides from calcium nitrate tetrahydrate and aluminum nitrate nonahydrate, carrying out acid modification on calcium-based montmorillonite by using dilute sulphuric acid, purifying humic acid, and mixing with calcium chloride and magnesium chloride hexahydrate to prepare humic acid chelated calcium magnesium powder. Finally, the three components are added into pig excrement fermentation liquor to prepare a plant nutrient solution, an adsorption-replacement-leaching closed loop can be formed, the desalination and alkali reduction efficiency is remarkably improved, the soil structure is improved, the effect of synergistically improving the saline-alkali soil is achieved, and therefore plant growth is promoted.

The invention provides a method for synthesizing high-valued amorphous calcium carbonate through carbon sequestration of carbide slag, and belongs to the technical field of carbon sequestration and high-valued utilization of industrial solid waste resources. The method comprises the following steps: carrying out active calcium extraction reaction on a dried and ball-milled carbide slag aqueous solution through ammonium chloride, stirring and filtering to obtain a calcium-containing solution; the method comprises the following steps: adding a certain amount of absolute ethyl alcohol and magnesium chloride into a calcium-containing solution, fully stirring, adjusting the pH value to a certain value, and introducing CO2 gas for mineralization reaction to obtain a turbid liquid containing calcium carbonate precipitate; and carrying out centrifugal separation, alcohol washing and drying on the turbid liquid to obtain powder calcium carbonate. According to the method disclosed by the invention, the calcium carbide slag active calcium liquid is extracted by adopting ammonium chloride, and absolute ethyl alcohol-magnesium chloride is added to precisely regulate and control the reaction steps of CO2 and the extracted calcium liquid, so that the CO2 is efficiently fixed, and meanwhile, mineralization is performed to obtain a mixed crystal type amorphous nano calcium carbonate product. According to the technology, double targets of synthesizing high-valued calcium carbonate through carbide slag carbon sequestration are achieved, and an innovative technical path is invented for current solid waste resource utilization.

The invention relates to the technical field of metallurgy, and provides a method and system for preparing a spongy TC4 alloy raw material, and the method comprises the following steps: heating and mechanically stirring titanium tetrachloride, aluminum trichloride and vanadium tetrachloride according to a component proportion required for preparing a TC4 alloy to form a uniform chloride mixture; the chloride mixture is subjected to a reduction distillation reaction in the presence of magnesium, and inert gas is continuously introduced in the reaction process for stirring; and after the reaction is completed, separating the byproduct magnesium chloride to obtain the spongy TC4 alloy raw material. According to the scheme, use of high-cost metal raw materials is avoided from the source, meanwhile, the complex steps of electrode preparation and repeated smelting are omitted through the one-step reduction distillation reaction, and energy consumption and time cost are greatly reduced.

The invention discloses a method for preparing calcium hydroxide with a high specific surface area by digesting calcium oxide, and relates to the technical field of preparation of calcium hydroxide with a high specific surface area. The method is characterized in that diethylene glycol / triethanolamine / magnesium chloride is adopted as a compound digestion aid through two processes of wet digestion and dry digestion; and calcium hydroxide with high specific surface area can be controllably prepared. The specific surface area of the calcium hydroxide prepared through wet digestion can reach 70 m < 2 >. G <-1 > or above, the specific surface area of the calcium hydroxide prepared through dry digestion is 45 m < 2 >. G <-1 > or above, the reaction activity of the calcium hydroxide is effectively improved, and the novel controllable method for preparing the calcium hydroxide with the high specific surface area is provided.

The invention belongs to the field of catalyst preparation, and particularly relates to a binder for catalyst forming and a preparation method and application thereof. The binder for forming the catalyst, provided by the invention, is prepared from the following raw materials in parts by weight: 0.5 to 2 parts of magnesium chloride, 1 to 2 parts of magnesium oxide, 0.5 to 2 parts of sodium carboxymethyl cellulose, 1 to 3 parts of ethylenediamine tetraacetic acid, 2 to 6 parts of nano-hydroxyapatite modified polyester, 1 to 3 parts of organic solvent and 10 to 35 parts of water. When the binder provided by the invention is applied to catalyst forming, on one hand, the problems that a conventional catalyst is poor in binding performance, and acid gas corrodes equipment and pollutes the environment in the roasting process can be solved; on the other hand, the surface acidity of the catalyst carrier can be reduced, a suitable reaction environment can be provided for some reactions needing to be carried out in an alkaline environment or reactions with acidic reactants and intermediates, and the selectivity and conversion rate of the reactions are improved.

The invention provides nano magnesium aluminate spinel with high sintering activity and high dispersity and a preparation method thereof, and belongs to the field of nano material preparation. The method comprises the following steps: mixing aluminum chloride, magnesium chloride and deionized water to obtain a mixed solution; adding aluminum bicarbonate into the mixed solution, and carrying out hydrothermal reaction, so that aluminum hydroxide and magnesium hydroxide are precipitated at the same time to obtain a magnesium aluminate spinel precursor; the magnesium aluminate spinel precursor is subjected to first-stage roasting, so that the magnesium aluminate spinel precursor is subjected to flash pyrolysis to form a fine crystal nucleus, and a pyrolysis product is obtained; and performing second-stage roasting on the pyrolysis product to control the crystal nucleus of the pyrolysis product to grow along a specific crystal face, thereby obtaining the nano magnesium aluminate spinel powder. A nanoscale precursor is precisely regulated and controlled to be controllably and orderly separated out through a wet-process system micro-area reaction; the crystal form development, the microstructure and the size uniformity of the powder are controlled through a flash pyrolysis nucleation-crystal face oriented growth two-stage roasting technology.

The invention discloses a high-flame-retardant plate and a production process thereof, and relates to the technical field of flame-retardant materials. The high-flame-retardant plate is prepared from the following raw materials in parts by weight: 90 to 110 parts of magnesium oxide, 15 to 20 parts of magnesium chloride, 30 to 35 parts of magnesium sulfate, 1.5 to 3 parts of modified polyvinyl alcohol, 1 to 2 parts of starch, 0.3 to 0.8 part of modified borax, 0.2 to 0.5 part of silane coupling agent KH-550, 1 to 2 parts of absolute ethyl alcohol, 2.5 to 3.5 parts of nano zinc borate, 2 to 4 parts of chlorinated paraffin-70, 0.5 to 1 part of nano titanium dioxide, 5 to 10 parts of basalt fiber and 0.2 to 0.5 part of calcium stearate. And 90 to 110 parts of deionized water. The raw materials of the high-flame-retardant plate are subjected to condensation cross-linking and nanometer enhancement of the modified polyvinyl alcohol and esterification and chelation treatment of the modified borax, so that the flame-retardant compatibility is improved. In production, pre-dispersion of the silane coupling agent and synergistic mixing of the starch paste are matched with precise viscosity regulation and control and stepped sanding, so that uniformity of the slurry is ensured. And hot pressing parameters are optimized, so that the plate is high in density and excellent in flame retardance and surface precision.

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 preparation process and application of a high-performance novel building material, relates to the technical field of building materials, and aims to solve the problems that a fireproof plate in an existing high-performance novel building material is insufficient in fire endurance, easy to crack and deform at high temperature and incapable of effectively obstructing flame diffusion. The preparation process comprises the following steps: S1, raw material treatment: selecting magnesium oxide, magnesium chloride, silica fume, glass fibers, basalt fibers, plant fibers, nano magnesium hydroxide, a formaldehyde-free adhesive and water as raw materials, then performing alkali liquor soaking and drying treatment on the plant fibers, treating the glass fibers through a coupling agent, and performing microwave treatment on the basalt fibers; s2, raw materials are weighed, specifically, 30-40 parts by weight of magnesium oxide, 15-20 parts by weight of magnesium chloride, 5-10 parts by weight of silica fume and 5-8 parts by weight of glass fibers are sequentially weighed; the method has the advantage of improving the performance of the fireproof plate.

The invention provides an oral thylakoid product for resisting organ failure and aging, which is prepared by the following steps: extracting thylakoid from plants including spinach, arabidopsis thaliana, lettuce, cabbage, green algae or wheat seedlings, redissolving the thylakoid into a buffer salt solution A, and carrying out ultrasonic treatment for 10-20 minutes under the ultrasonic power of 200-500W to prepare a suspension; adjusting the concentration of the suspension to 0.5-2 mg / ml, and obtaining a nano capsule-like body with the particle size of 200-500 nm by using a microfluidic technology; the buffer salt solution A is prepared from 10 to 100 mmol / L of 4-hydroxyethyl piperazine ethanesulfonic acid (HEPES), 1 to 2 mmol / L of ethylenediamine tetraacetic acid (EDTA) disodium, 0.5 to 4 mmol / L of magnesium chloride (MgCl2), 1 to 10 mmol / L of ascorbic acid and 100 to 500 mmol / L of sapoeda sodium (SNAC), and the pH value of the buffer salt solution A is adjusted to 7.5 to 8.0; and the concentration of the capsule in the buffer salt solution A is 100-400 mg / mL. According to the product, self QPRT enzyme of the thylakoid is used for efficiently catalyzing de novo synthesis of NAD + of whole body tissues and organs, so that multiple physiological processes such as energy synthesis enhancement, oxidative stress reduction and inflammatory reaction relief are finally realized, organ failure is efficiently reversed, and organ aging is relieved.

The present invention provides a method of producing hydrochloric acid, comprising reacting high-temperature gaseous chlorine and water vapour in a carbon-free reverse Deacon reaction (RDR) at a temperature of from about 450 to about 750 °Celsius to produce a mixture of gases comprising hydrogen chloride and oxygen. The chlorine is produced by fusing and electrolysing sodium or magnesium chloride in solid phase. The water vapour comes from thermally decomposing a hydroxide of at least one of calcium, magnesium and iron in the absence of oxygen to produce the water vapour without any admixture of oxygen (e.g., from atmospheric air). The mixture of gases produced by the RDR is immediately contacted with liquid water to dissolve the hydrogen chloride therein, thereby producing hydrochloric acid and a stream of tail gases. Heat is extracted from the hydrochloric acid to maintain its temperature substantially constant until the stream of tail gases is no longer in contact therewith. Thus the chlorine and water vapour are both supplied to the RDR at high purity and require little, if any, preheating. Heat extracted from contacting the mixture of gases with liquid water may be used to keep the RDR within its range of operating temperatures. Oxygen can be separated from the stream of tail gases, and the oxygen-depleted stream can be recycled back to the RDR to give a high percentage conversion of chlorine to hydrogen chloride. The RDR may be uncatalysed and kept within its operating temperature range by radio-frequency volumetric heating in at least one of the IEEE Ku-, K- and Ka-bands. The invention also provides a corresponding apparatus (1h) for producing hydrochloric acid, comprising an electrolytic cell (10) for the electrolysis, a gas-tight kiln (20) for the thermal decomposition, a gas-phase reactor (30) for the RDR, and an absorber (40) for dissolving the hydrogen chloride in the liquid water. The apparatus (1h) may further comprise a separator (80) for separating the stream of tail gases into the oxygen-depleted stream and a stream of oxygen, which may be fed to a steelmaking apparatus (90), for example. The liquid water for dissolving the hydrogen chloride can come from condensing water vapour obtained by drying an aqueous solution of sodium or magnesium chloride or of sodium hydroxide. The apparatus (1h) may therefore also comprise a dryer (60) for drying this aqueous solution, and a condenser (70) for condensing the water vapour thus obtained. Sodium chloride or magnesium chloride in solid phase derived from drying the aqueous solution may be recycled back to the electrolytic cell (10). Electricity for the electrolysis can come from a renewable resource. At least some of the heat for the thermal decomposition may come from the liquid metal which is a co-product of the electrolysis. The invention is therefore highly energy efficient and requires little, if any, extra energy, apart from the electricity required for the electrolysis. The invention also uses commonly available ingredients and produces no greenhouse gases.

The present invention reduces usage of sodium chloride by adding magnesium chloride, and overcomes problems occurring in using magnesium chloride. The present inventors have found that when magnesium chloride is added instead of sodium chloride to noodle strings and a reducing sugar is further added, preferable well-cooked feeling and appearance are imparted in subsequent production process for instant noodles, and thus, the present invention was accomplished. Specifically, the present invention relates to noodle strings for use in production of instant noodles, the noodle strings containing a raw material powder, magnesium chloride and a reducing sugar.

The present disclosure provides a board material and a preparation method thereof. The board material of the present disclosure includes: an inorganic board, the inorganic board includes a plant fiber and an inorganic material, in which the mass ratio of the inorganic material to the plant fiber ranges from 1.2 to 1.5; the raw material components of the inorganic material include a magnesium sulfate, a magnesium oxide, a magnesium chloride and a modifier, the mass ratio of the magnesium sulfate to the magnesium oxide ranges from 0.4 to 0.5; the mass ratio of magnesium chloride to magnesium oxide ranges from 0.05 to 0.15; the mass ratio of the modifier to the magnesium chloride ranges from 0.025 to 0.045; the 24 h water-absorbing thickness swelling of the inorganic board is less than or equal to 3%.

The invention belongs to the technical field of anhydrous magnesium chloride production, and particularly relates to a preparation process of anhydrous magnesium chloride, which comprises the following steps: firstly, dissolving magnesium chloride hexahydrate in absolute ethyl alcohol to form a magnesium chloride ethanol aqueous solution, and then dehydrating the magnesium chloride ethanol aqueous solution by using a molecular sieve to obtain the magnesium chloride ethanol solution; carrying out secondary cooling, stirring crystallization, secondary solid-liquid separation and vacuum drying on the magnesium chloride ethanol solution to obtain high-purity anhydrous magnesium chloride; and recycling ethanol liquid obtained by solid-liquid separation and ethanol gas obtained by vacuum drying. The technical scheme provided by the invention is simple in process flow, low in energy consumption, low in equipment requirement, high in product yield and high in purity, and can be directly applied to the fields of electrolytic preparation of magnesium, catalyst carriers and the like.

The application relates to the technical field of high polymer materials, in particular to ammonia-removing and humidity-controlling water gel as well as a preparation method and application thereof, which comprises the following raw materials: deionized water, AM, MBA, Gly, lithium chloride, 2-hydroxy-2-methyl propiophenone, magnesium chloride or magnesium oxide; the AM and the MBA are added into the deionized water, and polymerization is initiated by 2-hydroxy-2-methyl propiophenone and ultraviolet light to form a polyacrylamide network, so that the novel water gel can stably control humidity and effectively remove ammonia in long-term storage, effectively adsorb ammonia and provide molecular-level water molecules, and the required humidity of a cigar is maintained; secondly, the MBA is added into the water gel to form a more stable and porous three-dimensional crosslinking network, which can not only adjust the moisture absorption / relaxation rate of the water gel, realize humidity buffering, but also adsorb ammonia molecules through acid-base neutralization, ion exchange, hydrogen bonding, electrostatic interaction, so that the water gel can maintain the required humidity of the cigar for a long time and reduce the volatilization of ammonia.

The present disclosure relates to compositions comprising magnesium oxide (MgO) and magnesium chloride (MgCl2), particularly compositions comprising MgO, MgCl2 and an organic solvent-based resin, which may, for example, be suitable for use in the preparation of cementitious articles. The present disclosure also relates to cementitious articles formed from the compositions, and methods of forming the same.

This invention relates to the field of casting technology for sand cores and sand shells, and particularly to a method for preparing high-precision casting sand cores and sand shell components based on a coated sand process. The method includes the following steps: rinsing quartz sand and reacting it with a sodium silicate solution to obtain coated quartz sand; adding 3-aminopropyltriethoxysilane and water to the coated quartz sand in a high-speed mixer; sequentially adding modified benzoxazine resin, calcium citrate, magnesium chloride, hyperbranched polyamide, and polycaprolactone-grafted starch to obtain finished coated sand; plasma-treated chromium-12 molybdenum-vanadium mold steel to obtain an amino-modified mold; sand-jetting the finished coated sand into left / right half-shells; shaping and pre-embedding chromite sand cores with chills to obtain left / right half-shell green blanks; milling the surfaces of the left / right half-shell green blanks, coating them with resin, butt-jointing, curing, and deburring to obtain the casting sand core and sand shell. This method solves the problems of poor mechanical strength, poor high-temperature stability, low production efficiency, and poor environmental performance in high-precision casting sand cores and sand shells.

The invention discloses a preparation method of an LDH (layered double hydroxide) membrane for a micro-nano bubble device, which comprises the following steps: putting an ultrafiltration membrane into a composite solution consisting of magnesium chloride and nitrate for soaking, uniformly dispersing by ultrasonic waves, and transferring into a reaction kettle for hydrothermal reaction to obtain the LDH membrane. The invention also discloses application of the LDH film. Magnesium chloride and nitrate are adopted to perform hydrothermal reaction on an ultrafiltration membrane to obtain an LDH-loaded filter membrane product (LDH membrane), and the LDH membrane has a unique layered structure and excellent anion exchange performance, is mainly applied to the field of heavy metal wastewater treatment, and has a wide application prospect.

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.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

The present application relates to a kind of enhanced magnesium cementitious material and its preparation method.The raw materials of the enhanced magnesium cementitious material include by weight parts: 1-5 parts of carbon dot modified hydrosol, 5-15 parts of magnesium sulfate, 25-35 parts of magnesium chloride, 95-105 parts of magnesium oxide and 0.001-0.01 parts of boric acid, the carbon dot modified hydrosol is prepared by hydrothermal reaction of hydrosol precursor in the presence of crosslinking agent and oxidizing agent, the conditions of the hydrothermal reaction include: temperature 120~150 ℃.The carbon dot modified hydrosol provided by the present application has excellent permeability and bonding strength, magnesium oxychloride inorganic glue enhances the mechanical strength of cementitious material, magnesium sulfate inorganic glue enhances the water resistance of cementitious material, the obtained cementitious material has the advantages of high mechanical and bonding strength, good water resistance under the cooperation of the three, and has good flame retardant effect.The present application also relates to a kind of plywood comprising the above-mentioned enhanced magnesium cementitious material and its preparation method.

The invention belongs to the technical field of medicinal plant cultivation, and particularly provides a method for increasing the content of sesquiterpene glycoside in dendrobium nobile. The method comprises the step of applying a magnesium ion-containing solution with effective concentration at the growth stage of dendrobium nobile. Preferably, the magnesium ion-containing solution is a magnesium chloride solution, the application concentration is 10-500 mg / L, the magnesium ion-containing solution is applied in a foliage spraying or root irrigation mode, and the key period of application is the rapid growth period or the effective component accumulation period of the dendrobium nobile. The promotion effect of exogenous magnesium ions on biosynthesis of the sesquiterpene glycoside of the dendrobium nobile is disclosed for the first time, and the content of sesquiterpene glycoside components in the dendrobium nobile medicinal material can be remarkably increased under the condition that a basic cultivation mode is not changed, so that the medicinal potential and market value of immunoregulation, anti-inflammation and the like of the dendrobium nobile medicinal material are enhanced. The method is simple, efficient, low in cost, free of pollution and suitable for industrial application.

This invention belongs to the field of soil manganese extraction technology, and discloses a stepwise extraction method and application for manganese species in soil. First, exchangeable manganese is extracted using magnesium chloride; then, manganese carbonate and sulfides are extracted using hydrochloric acid; next, active Mn(III) bound to organic matter is extracted using pyrophosphate solution under alkaline pH; then, manganese oxides are dissolved using hydroxylamine hydrochloride; and finally, manganese bound to crystalline iron and manganese oxides is extracted using sodium dithionite solution. This stepwise extraction scheme accurately quantifies the concentration of active Mn(III) species bound to organic matter in the soil. Experimental results show that the extraction method of this invention can effectively separate different forms of manganese in soil. In particular, PP extraction successfully distinguishes Mn(III) bound to organic matter without introducing interfering substances such as iron minerals that may interfere with dissolution.

The invention discloses a low-temperature dehydration method of hydrous magnesium chloride and anhydrous magnesium chloride, comprising the following steps: contacting hydrous magnesium chloride with ammonium chloride to obtain a mixed dehydrated raw material; and heating the mixed dehydrated raw material, and keeping the temperature for a certain time after the mixed dehydrated raw material reaches a set temperature until water in the water-containing magnesium chloride is removed. The invention also provides the anhydrous magnesium chloride prepared by the method. According to the method, synthesis of carnallite is not needed, hydrogen chloride protective gas is not needed, dehydration can be achieved through independent ammonium chloride, equipment is hardly corroded, the operation environment is good, and anhydrous magnesium chloride is prepared under the mild condition.

The invention discloses a method for preparing phenyl acetate with high selectivity. A phosphoric acid solution is added into a magnesium chloride solution, stirring and heating are performed to obtain a suspension, the suspension is dried to constant weight to obtain a white solid, the white solid is ground to obtain powder, and the powder is calcined to obtain the catalyst. Then mixing phenol and a catalyst, placing the mixture in an oil bath for reflux reaction, dropwise adding acetic anhydride, distilling after the reaction is finished, and collecting a fraction at 190-195 DEG C, namely phenyl acetate. According to the magnesium chloride loaded phosphoric acid type catalyst (MgCl2-H3PO4) prepared by the method disclosed by the invention, phenol and acetic anhydride react without a solvent, MgCl2-H3PO4 is a solid catalyst, can be recycled only by filtering and can be repeatedly used after being washed, and MgCl2-H3PO4 also improves the selectivity of phenyl acetate and reduces the production cost.

The invention discloses a processing method for preparing anhydrous sodium sulphate based on high-salt brine denitration, and relates to the technical field of anhydrous sodium sulphate preparation, and the processing method comprises the following steps: adding a filter aid into high-salt brine, stirring and filtering, adding sodium carbonate and magnesium chloride, adjusting the pH value to 11-11.2, stirring and filtering, adjusting the pH value of filtrate to 7-7.2, and filtering with modified activated carbon to obtain high-salt brine crude liquid; a scale inhibitor is added into the high-salt brine crude liquid, modified anion exchange resin is used for adsorption denitration, filtrate is collected, and low-nitrate brine is obtained; the low-nitrate brine is evaporated and concentrated, after the mass concentration of sodium sulfate is increased to 80-100 g / L, precooling and gradient cooling are carried out, vacuum drying is carried out, and the anhydrous sodium sulphate is obtained.

The invention relates to a catalyst, a preparation method and a cyanogen-containing wastewater treatment device and method, and the preparation method of the catalyst comprises the following steps: mixing an M source, a carbon material and a hard template agent, and drying to obtain a precursor; the precursor is sequentially subjected to microwave pretreatment, pyrolysis and acid pickling, and the catalyst is obtained; the M source comprises an organic metal framework compound containing M and / or a metal organic complex containing M; m comprises any one or a combination of at least two of cobalt, iron, copper or manganese; the hard template agent comprises magnesium chloride, calcium carbonate or silicon dioxide. The catalyst provided by the invention can realize monatomic dispersion of M, and can cooperate with anaerobic ammonia oxidation reaction to realize efficient denitrification when being used for treating cyanide-containing wastewater, and the flow of the treatment method can form a pollutant self-absorption closed loop of'treating waste with waste '.

The high-molecular gas-phase corrosion inhibitor comprises the following raw materials in percentage by weight: 50-60 parts of magnesium chloride mixture / anhydrous magnesium chloride, 10-20 parts of polyethylene, 5-10 parts of COFs framework material and 20-30 parts of gas-phase corrosion inhibitor, the magnesium chloride mixture is anhydrous magnesium chloride and magnesium oxide, and the mass ratio of the anhydrous magnesium chloride to the magnesium oxide is 1: (1-5). The synergistic response of moisture absorption and slow release is realized, the temperature application range is widened, and the bulk density of the obtained macromolecular gas-phase corrosion inhibitor is greater than or equal to 0.75 g / ml; the moisture absorption rate at the normal temperature of 25 DEG C is greater than or equal to 92%, the moisture absorption rate at the high temperature of 70 DEG C is greater than or equal to 88%, the gas-phase slow-release capability reaches grade 0 or grade 1, and the mechanical wear rate is lt; and 1.2%.

The invention discloses a method for preparing a humic acid anchored hydrotalcite coated Fe3O4 magnetic material based on salt lake bischofite and application, and belongs to the technical field of heavy metal adsorbents. The method comprises the following steps: preparing high-purity magnesium chloride hexahydrate by taking salt lake bischofite as a raw material, mixing with an aluminum source, hydrolyzing to generate a hydrotalcite precursor, and decomposing the nitrogen source to provide an alkaline environment to promote formation of a layered structure; humic acid is chelated with heavy metals through functional groups and is stably anchored on the surface of hydrotalcite, Fe3O4 is used as a magnetic substrate, the material is endowed with magnetism, and a hydrothermal one-step in-situ growth composite structure is realized. The composite material combines the advantages of humic acid, hydrotalcite and Fe3O4, the adsorption capacity is remarkably improved, chemical adsorption is enhanced, efficient solid-liquid separation is achieved, and the defects of traditional materials are overcome. When the bischofite is used as a heavy metal adsorbent, lead ions can be efficiently removed and rapidly recovered, the steps are simple, the cost is low, the effect is remarkable, a new way is developed for utilization of the bischofite in the salt lake, and the bischofite has subject and application values.

The invention discloses a preparation method of a calcium carbonate-polyvinyl alcohol composite aerogel material, and belongs to the technical field of thermal insulation materials. The invention aims to solve the problems that the crystallization behavior of calcium carbonate is difficult to effectively regulate and control and the porous structure and the heat insulation function of aerogel are easily damaged in the prior art. The method comprises the following steps: reacting a mixed solution of calcium chloride and magnesium chloride with carbon dioxide to prepare micro-nano amorphous calcium carbonate and a small amount of nano calcite; co-doping the chitosan and aspartic acid into polyvinyl alcohol hydrogel, uniformly mixing, and carrying out directional freezing and freeze-drying treatment; finally, high-concentration carbon dioxide atmosphere treatment is adopted in a humid and hot environment, amorphous calcium carbonate is induced to be dissolved on the polyvinyl alcohol framework and recrystallized into calcite and vaterite shell layers, and therefore the composite aerogel material is obtained. While good heat insulation performance and flexibility are maintained, the mechanical strength and damp and heat resistance stability of the material are remarkably improved, efficient curing and utilization of carbon dioxide are achieved, and the material is suitable for the field of green energy-saving buildings.