31 results about "Barium hydroxide" patented technology

This invention discloses a method for preparing and analyzing trans-4-aminocyclohexylacetic acid. The preparation method is as follows: 4-nitrophenylacetic acid undergoes catalytic hydrogenation in a solvent, followed by filtration. The filtrate is then treated with acid to obtain a 4-aminophenylacetic acid salt solution. The collected catalyst is activated. The 4-aminophenylacetic acid salt solution is mixed with isopropanol, barium hydroxide, tetrabutylammonium bromide, 18-crown ether-6, and dibutyl phthalate. The activated catalyst is then added to initiate a catalytic hydrogenation reaction. After the reaction, the reaction solution is cooled and filtered. The resulting solid is mixed with a preheated dilute sulfuric acid solution and stirred to form a slurry. The mixture is then filtered, and the filtrate is neutralized and filtered again. The collected filtrate is concentrated and crystallized. The crystallized precipitate is washed and dried to obtain trans-4-aminocyclohexylacetic acid. The method provided by this invention has high reaction efficiency, mild conditions, and is suitable for industrial production. It yields high product purity and reliability. Furthermore, the analytical method provided by this invention is accurate and reliable.

The invention provides a barium chloride production waste residue treatment method, and relates to the technical field of barium chloride production waste residue treatment, and the barium chloride production waste residue treatment method comprises the following steps: S1, carrying out ball milling on waste residues containing barium sulfate and barium sulfide, and then carrying out pre-oxidation and hydration treatment to obtain a barium hydroxide-containing turbid liquid; s2, dehydrating and drying the turbid liquid in the S1; s3, mixing and calcining the dried material and sodium carbonate to obtain a calcined product containing barium carbonate; s4, the calcined product is subjected to hot water leaching to remove soluble sodium salt, and water leaching residues are obtained; s5, first-stage acid leaching is conducted on the water leaching residues through low-concentration hydrochloric acid, and first-stage leaching liquid and first-stage filter residues are obtained through filtering; performing second-stage acid leaching on the first-stage filter residue by using high-concentration hydrochloric acid, and filtering to obtain a second-stage leaching solution; and S6, combining the first-stage leaching solution and the second-stage leaching solution, adjusting the pH value to 4.0-5.0, filtering and separating precipitates, and concentrating and crystallizing to obtain a barium chloride product. According to the method, efficient conversion and resource utilization of barium in the waste residues are achieved through the processes of pre-oxidation toxicity control, calcination conversion, gradient acid leaching and deep purification.

The invention discloses a high-speed rail sound screen wall self-repairing nano coating and a preparation method thereof, and belongs to the technical field of coatings, sodium alginate is crosslinked with calcium ions in calcium chloride, gel microspheres are formed on the surface of porous shell powder, a self-repairing agent is wrapped in the gel microspheres, barium nitride is hydrated to form barium hydroxide under the excitation action of water, and the self-repairing nano coating is formed. Barium hydroxide belongs to an alkaline compound, and through the wrapping effect of the microcapsule, the corrosion effect on a modified binder in a system can be reduced, so that the material has the advantages of light weight, sound insulation, good acid and alkali resistance, washing resistance and compressive strength; polyvinyl alcohol is used as a bridge, hydroxyl of polyvinyl alcohol is combined with carboxyl of carboxymethyl chitosan and then copolymerized with vinyl acetate to form a three-dimensional network structure, cohesive force of the adhesive and adhesive force to a base material are greatly improved, calcium ions are separated out due to the alkaline effect of barium hydroxide, and meanwhile the crosslinking strength of the adhesive can be improved; the bonding strength is further improved.

The application relates to the technical field of chemical analysis, and discloses a method for extracting, separating and detecting N-nitrosamine, which comprises the following steps: a sample obtaining step; a sample purification step; a preparation and extraction solution step; an extraction solution separation step; an extraction solution concentration step; a chromatographic detection and quantitative analysis step; the sample to be detected is crushed to a size of 0.01g of powder, and the powder is mixed with sodium chloride, barium hydroxide and water. In the application, the sample to be detected is subjected to a step-by-step sample treatment process before detection, so that the interference factors of the sample to be detected can be effectively reduced, the influence on the detection instrument is reduced, the detection result and detection data are more accurate, and when the application is detected, a large amount of sample does not need to be weighed like in the traditional detection mode, the overall operation is more convenient, and the detection demand of N-nitrosamine in smoked food is met.

The application discloses a preparation method of a water-based developing solution, the water-based developing solution and application thereof, and belongs to the technical field of developing solutions. The preparation method comprises the following steps: a first amount of sulfuric acid is mixed with a second amount of isopropyl alcohol to obtain an isopropyl alcohol solution; tetramethylammonium chloride is mixed with the isopropyl alcohol solution according to a first preset proportion, a third amount of sulfuric acid is added, and the precipitate is filtered and dried to obtain white crystalline solid tetramethylammonium sulfate; the solid tetramethylammonium sulfate is dissolved in water, a suspension of barium hydroxide is added to the water, the reaction mixture is filtered, a tetramethylammonium hydroxide solution is obtained and purified; and the purified tetramethylammonium hydroxide solution is mixed with water according to a second preset proportion, and stirring is performed to obtain the water-based developing solution. The application aims to provide a water-based developing solution to solve the problem that the conventional developing solution in the form of an organic solvent is inconvenient to use in a chip developing process.

The invention provides a high-efficiency ethylene preparation method, and relates to the technical field of chemical synthesis. According to the method, ethephon ClCH2CH2PO (OH) 2 is used as an ethylene precursor, barium hydroxide Ba (OH) 2 is used as an alkaline reaction medium, ethylene is efficiently prepared through hydrolysis reaction at normal temperature, and high temperature and strong acid are not needed in the core reaction. The core innovation lies in that a'mild hydrolysis-directional gas production 'technology is adopted, the raw material ratio and reaction conditions are optimized, rapid gas production within 1 minute is realized, and the purity of ethylene is greater than or equal to 92%; the raw materials are easy to purchase, low in price and high in safety, byproducts can be recycled, and the problems that a traditional concentrated sulfuric acid dehydration method is high in corrosion risk, large in energy consumption and many in byproducts are solved. The method is easy and convenient to operate and visual in phenomenon, the gas production efficiency is improved by 60% or above compared with that of a traditional method, the cost is reduced by 50%, the ethylene property verification requirement in teaching is met, efficient preparation of small experiment scenes is also adapted, and remarkable safety, economical efficiency and practicability are achieved.

The invention relates to the technical field of fine chemical engineering, in particular to a preparation method of high-purity barium chloride. The method comprises the following steps: firstly, grafting an amino group on nano silicon dioxide and further synchronously introducing a hydrophobic chain and a phosphate group to prepare a difunctional surfactant with dispersion and impurity pre-adsorption functions for pretreating a witherite raw material; then calcining and dissolving with acid to obtain a crude solution, and sequentially carrying out multi-mechanism deep impurity removal and vacuum crystallization purification through barium hydroxide alkali adjustment hydrolysis, a targeted complexing agent and the like, so as to finally obtain high-purity barium chloride. According to the method disclosed by the invention, various impurities are efficiently and deeply removed through the cooperation of the whole processes of raw material pretreatment, targeted complexing and crystallization washing, the purity of the obtained barium chloride can reach 99.99% or above, the process flow is stable, and the yield is relatively high.

The invention relates to the technical field of catalysts, and particularly discloses a preparation method and application of a catalyst for hydrogenation of dimethyl 1, 6-adipate, and the preparation method of the catalyst comprises the following steps: S1, crushing and sieving montmorillonite, carrying out acid treatment, and washing and drying after treatment; s2, dissolving szaibelyite in hot nitric acid under stirring, filtering after dissolving is completed, adding a barium hydroxide solution into filtrate, mixing and stirring, adjusting the pH value to 9.5-10.5, and aging at 50-80 DEG C; s3, uniformly mixing the montmorillonite obtained in the S1 with the material obtained in the S2 for reaction, and then filtering, washing, drying and roasting to obtain a modified montmorillonite carrier; and S4, uniformly mixing the modified montmorillonite carrier, a metal salt solution and a precipitant, standing, aging, filtering, washing, drying and calcining to obtain the modified montmorillonite catalyst. The catalyst has good catalytic performance in the reaction process of preparing 1, 6-hexanediol through hydrogenation of dimethyl 1, 6-adipate, the conversion rate of dimethyl 1, 6-adipate and the selectivity of 1, 6-hexanediol are both higher than 99%, impurities are few, the catalyst is not prone to loss, and the catalyst is green and environmentally friendly.

The invention relates to the fields of chemical industry, pyrotechnic compositions, fireworks and crackers and the like, and relates to preparation of barium fumarate serving as a novel compound material with coloring agent and reducing agent effects, and preparation and application of the material in the fields of pyrotechnic compositions, fireworks and crackers and the like. The preparation method comprises the following steps: mixing fumaric acid and barium carbonate or barium oxide or barium hydroxide, and heating an aqueous solution to prepare barium fumarate; furthermore, the barium fumarate can be fully mixed with selected other substances to prepare a green pyrotechnic composition, and the green pyrotechnic composition is applied to fireworks and crackers and other fields; in addition, the barium fumarate is mixed with other selected substances, a small amount of perchlorate can be selectively added and fully mixed to prepare non-pyrotechnic composition or pyrotechnic composition substances in various geometrical shapes, and then the substances are placed in handheld, ground and air (including aircrafts) devices or equipment to be used for preparing the non-pyrotechnic composition or pyrotechnic composition. The non-pyrotechnic composition and the pyrotechnic composition substance can be ignited according to the electronic heating principle, and green light is emitted through combustion for color development.

The present application relates to the technical field of barium hydroxide preparation, and proposes a method for preparing barium hydroxide based on barium carbonate, comprising the following steps: S1, adding a dispersing agent and a phase transfer promoter into water, stirring uniformly, then adding barium carbonate, and then ultrasonic dispersion under the condition of 65-70 DEG C to obtain a slurry; S2, adding organic amine into the slurry of step S1, adjusting the pH value to 10.8-11.5, then adding a complexing agent to remove impurities, adding alkali to adjust the pH value to 11.8-12.4, heating to 75-85 DEG C, and then putting in barium hydroxide seed to induce nucleation and precipitate barium hydroxide; S3, heat filtering the reaction product of step S2, and then washing and drying the filter cake to obtain barium hydroxide. Through the synergistic process of dispersing agent, phase transfer promoter and segmented pH control, the present application realizes the effect of efficiently preparing barium hydroxide from barium carbonate.

The application belongs to the technical field of hot melt adhesive processing, and particularly relates to a quick-drying polyurethane hot melt adhesive and a preparation method thereof. The polyurethane hot melt adhesive is prepared by mixing polyether polyol, isocyanate, chain extender A, chain extender B, crystallization promoter, surface drying promoter and additives, and then extruding and granulating, wherein the chain extender A is obtained by reacting acrylamide with diethanolamine, and then modifying the reaction product with methacryloyloxy methyl trimethoxysilane to obtain a siloxane; the chain extender B is obtained by reacting tetramethylammonium sulfate and barium hydroxide octahydrate, and then obtaining through hydrogen peroxide oxidation. The prepared hot melt adhesive has good adhesion and certain flame retardation effect.

The invention discloses a resourceful treatment and recovery method for high-concentration sulfate wastewater, and belongs to the technical field of sewage treatment. The method comprises the following steps: after being homogenized by a regulating tank, wastewater sequentially enters a coagulative precipitation tank I and an air floatation tank to remove suspended solids and colloids; lime milk is added into the primary sedimentation tank to precipitate most sulfate radicals, and a gypsum product is recycled; enabling the supernate to enter an advanced oxidation pond, and degrading organic matters by adopting alkali-activated sodium persulfate; the effluent passes through a secondary sedimentation tank, barium hydroxide is added to deeply precipitate sulfate radicals, and a high-purity barium sulfate product is recovered; and finally, adding sodium carbonate into the third-stage sedimentation tank to remove residual calcium ions, wherein the obtained high-quality effluent can be used as a recycled water resource. According to the method, graded conversion of sulfate radicals and collaborative recovery of gypsum and barium sulfate are realized through a cascade process of lime milk precipitation, advanced oxidation, barium salt precipitation and effluent reuse, and the method has the comprehensive advantages of low treatment cost, high product purity and environmental friendliness.

The invention discloses a method for preparing barium peroxide by an ultrasonic-visible light synergetic dry method, and belongs to the field of preparation of barium peroxide. A method for preparing barium peroxide by an ultrasonic-visible light synergetic dry method comprises the following steps: adding a barium hydroxide solid into a reactor, then adding a modified zinc oxide carrier, stirring for a certain time, turning on a visible light and ultrasonic wave generating device, continuously stirring, slowly adding atomized hydrogen peroxide, reacting for a certain time, and cooling to room temperature to obtain the barium peroxide. And drying to obtain a barium peroxide solid. The method can be used for solving the problems that the existing barium peroxide production process is complicated and has wastewater, and the barium peroxide prepared by the existing process is relatively low in purity and coarse in particle.

The invention relates to the technical field of cable connectors, and discloses an integrated cable connector which comprises a bottom plate. The mounting frame is positioned above the bottom plate; the connector body is located in the mounting frame, and a connecting assembly is arranged on the side face of the connector body; a cooling assembly is arranged on the inner side of the mounting frame and comprises a reaction box located on the inner side of the mounting frame, the top surface of the reaction box is fixedly connected with the top surface of the inner side of the mounting frame, and an adding pipe is arranged above the reaction box. Through a heat dissipation assembly, a connector body vibrates to push a push rod, so that a ventilation pipe blows an adjusting plate to move downwards, barium hydroxide octahydrate powder in a partition plate enters the bottom of a reaction box through a through hole, and then the barium hydroxide octahydrate powder and ammonium chloride powder are mixed to react and absorb heat; therefore, the connector body is cooled, the connector body is prevented from being damaged, and the use effect of the integrated cable connector is improved.

The invention provides a hollow magnetoelectric nano-particle which is prepared by the following steps: firstly, forming a hollow FO nano-particle with a hollow Fe3O4 spherical structure under the composite action of solvothermal reaction, citric acid reduction, urea alkaline environment and polyacrylamide controlled nucleation / viscosity regulation; tetrabutyl titanate is added, a compact TiO2 (TO) layer is deposited through a sol-gel method, and hollow FO (at) TO nanoparticles are prepared; finally, barium hydroxide is converted into a BaTiO3 (BTO) phase through a hydrothermal reaction, and the hollow magnetoelectric nano-particle HFO (at) BTO nano-particle with the core-shell structure is obtained. Compared with a solid structure, the hollow magnetoelectric nanoparticles have remarkable advantages in the aspects of magnetism-force-electricity conversion efficiency, biological interface stimulation performance and in-vivo dispersion stability by increasing strain space, enlarging interface coupling area and improving mechanical response speed and electric output efficiency; the method is a preferable structural form for constructing a high-performance wireless magnetoelectric nerve regulation material.

The application provides a high-temperature nickel-hydrogen battery formula and a preparation process. The positive electrode of the high-temperature nickel-hydrogen battery comprises a base body of foamed nickel, active material of spherical nickel hydroxide, a conductive agent of cobaltous oxide, a binder of sodium carboxymethyl cellulose, an additive of zinc oxide and cerium oxide; the negative electrode comprises a base body of copper mesh, active material of hydrogen storage alloy powder, a binder of polytetrafluoroethylene emulsion, and an additive of neodymium oxide; and the electrolyte comprises sodium hydroxide, potassium hydroxide and barium hydroxide. The positive electrode, a polypropylene diaphragm and the negative electrode are wound into an electric core, a layer of polyimide film is wound outside the electric core, and then the electric core is loaded into a battery steel shell, electrolyte is injected, the battery shell is sealed, and the high-temperature nickel-hydrogen battery is obtained through charging and discharging treatment. The high-temperature nickel-hydrogen battery of the application inhibits the release of oxygen in the positive electrode by adding zinc oxide to the positive electrode, and the addition of cerium oxide can prevent the failure of the spherical nickel hydroxide to a certain extent at a high temperature of more than 50 DEG, so that the charging efficiency of the positive electrode is obviously improved.

The invention discloses a method for preparing a barium titanate functional coating by a one-step method, which comprises the following steps of: 1, adding barium hydroxide octahydrate serving as a barium source into excessive glacial acetic acid, heating in a constant-temperature water bath, stirring until the solution is clear and transparent, and cooling to room temperature to obtain a solution A with the pH value of 5.0-6.8; 2, adding tetrabutyl titanate serving as a titanium source into absolute ethyl alcohol, and uniformly stirring to obtain a solution B; 3, dropwise adding the solution B into the solution A in a room-temperature stirring state; after the solution B is dropwise added, continuously stirring, mixing and aging to obtain a barium titanate precursor solution; fourthly, the metal material serves as a base body and is pretreated, and a pretreated base body is obtained; and (5) spraying the barium titanate precursor solution obtained in the step (3) onto a pretreated substrate through a solution plasma spraying process to prepare the barium titanate functional coating. The method is simple in process, and the obtained coating is uniform in component and has certain density and dielectric property while having relatively good hardness.

The application discloses a purification method of lithium carbonate, which comprises the following steps: mixing industrial-grade lithium carbonate with water according to a certain proportion and stirring to carry out beating; under the stirring condition, carbon dioxide is introduced into the solution after beating to carry out a reaction, so that a lithium bicarbonate solution is obtained; after the reaction is completed, barium hydroxide is added dropwise into the lithium bicarbonate solution, and then filtration is carried out; a small amount of hydrofluoric acid is added dropwise into the obtained filtrate, and then filtration is carried out; the obtained lithium bicarbonate filtrate is subjected to a cation exchange column, so that a relatively pure lithium bicarbonate solution is obtained; the obtained lithium bicarbonate filtrate is subjected to pyrolysis crystallization, lithium carbonate crystals are obtained after filtration; the obtained lithium carbonate crystals are stirred with a certain amount of ultrapure water, and then filtration and washing are carried out, so that high-purity lithium carbonate is obtained. The application can obtain high-purity lithium carbonate with a purity of greater than or equal to 99.99%, the amount of hydrofluoric acid added in the process is smaller, the purpose of impurity removal can be achieved, and the influence on the product yield is reduced as much as possible.

The invention relates to a synthesis method of a urea [14C] bulk drug, which comprises the following steps: introducing argon into a reaction furnace loaded with barium [14C] carbonate, and reacting in an ammonia atmosphere to obtain barium aminocyanide [14C]; the preparation method comprises the following steps: dissolving barium aminocyanide [14C] with purified water under ultrasound, centrifuging to obtain a first supernatant, adding a sulfuric acid solution into the first supernatant, carrying out hydrolysis reaction, and centrifuging to obtain a second supernatant; in an ultrasonic environment, respectively adding excessive barium hydroxide octahydrate into the second supernate, introducing carbon dioxide until the solution is neutral, and centrifuging to obtain third supernate; distilling and concentrating the third supernate, filtering, drying, dissolving with absolute ethyl alcohol, and filtering to obtain a urea [14C] ethanol solution. The synthesis method provided by the invention is simple in process, the intermediate product barium aminocyanide is solid, and ultrasonic dissolution is adopted during hydrolysis, so that not only can serious radioactive contamination caused by solution splashing in a container be avoided, but also raw material particle aggregation can be avoided, a target product can be better obtained, and the yield is improved.

The invention belongs to the technical field of cultural relic protection, and relates to a lead white lead return prevention and protection composition, application and a prevention and protection method, and the lead white lead return prevention and protection composition comprises a type A prevention and protection solution and a type B prevention and protection solution; the A-type preventive protection liquid consists of phosphoric acid, phosphotungstic acid and an organic solvent; the B-type preventive protection liquid is prepared from barium hydroxide, ethyl cellulose and an organic solvent; the organic solvent is methanol, ethanol or acetone. The lead white lead return prevention and protection composition provided by the invention can effectively prevent lead return of the lead-containing white pigment in a high-concentration hydrogen sulfide environment, and the lead return disease is inhibited and prevented from the source; and the original pigment layer is effectively prevented from being damaged, and the operation risk is low.

The invention belongs to the technical field of dielectric energy storage films, and relates to a barium titanate sub-nanosheet and polymer compounded dielectric energy storage film as well as a preparation method and application thereof. The barium titanate sub-nanosheet is prepared by taking barium hydroxide, sodium hydroxide and a sub-nanosheet TiO2 as raw materials and adopting a hydrothermal method, and the barium titanate sub-nanosheet has a perovskite structure; and compounding the prepared barium titanate sub-nanosheets with a polymer to prepare the dielectric energy storage thin film material. Barium titanate of a perovskite structure not only has a very high dielectric constant, but also has an ultra-large specific surface area, a high atomic ratio and abundant active sites, forms charge traps on an interface while hindering breakdown path propagation, and meanwhile, is very good in dispersion uniformity; and the breakdown field strength and the energy density of the dielectric energy storage film can be greatly improved under the ultralow loading capacity, so that the purpose of improving the dielectric energy storage performance is achieved.

The application discloses a preparation process of a marine concrete structure surface anti-erosion cement-based material, and comprises the following steps: (1) putting calcined hydrotalcite powder into a barium hydroxide hot solution for dipping treatment to obtain Ba 2+ @LDHs powder. (2) uniformly mixing serpentine powder, calcium nitrate and water, heating and keeping warm, then continuously keeping warm and aging under stirring after dropwise adding a sodium silicate solution, then separating a solid product, calcining the solid product, grinding the calcined product to obtain modified serpentine powder. 2+ (3) mixing magnesium phosphate cement, Ba @LDHs, modified serpentine powder and a retarder powder, and grinding to obtain modified magnesium phosphate cement powder. (4) uniformly mixing the modified magnesium phosphate cement powder, emulsified asphalt, inorganic fillers, fibers and water. The cement-based material has good bonding capacity with the concrete structure, reduces structure protection failure caused by falling, and simultaneously improves the anti-erosion capacity to chloride ions and sulfate ions.

The application provides a low-temperature nickel-hydrogen battery formula and a preparation process. A positive electrode of the low-temperature nickel-hydrogen battery comprises a base body of foamed nickel, active material of spherical nickel hydroxide, a conductive agent of cobaltous oxide, a binder of sodium carboxymethyl cellulose, an additive of zinc oxide and cerium chloride; a negative electrode comprises a base body of copper mesh, active material of hydrogen storage alloy powder, a binder of polytetrafluoroethylene emulsion, and an additive of yttrium oxide; an electrolyte comprises sodium hydroxide, potassium hydroxide, barium hydroxide and carboxymethyl cellulose. The positive electrode, a polypropylene diaphragm and the negative electrode are wound into an electric core, a layer of polyimide film is wound outside the electric core, and then the electric core is loaded into a battery steel shell, electrolyte is injected, the battery shell is sealed, and the low-temperature nickel-hydrogen battery is obtained through charging and discharging treatment. The low-temperature nickel-hydrogen battery of the application inhibits the release of oxygen in the positive electrode by adding zinc oxide to the positive electrode, and the addition of cerium chloride can prevent the failure of the spherical nickel hydroxide to a certain extent at a low temperature greater than 40 DEG, so that the charging efficiency of the positive electrode is obviously improved.

The invention is a method for removing carbon dioxide gas from ambient air using water and solid barium hydroxide in a reaction vessel. Incoming and outgoing water is supplied by freshwater and wastewater treatment plants through underground piping. The reaction vessel has an upper part and a jacket, which is heated by hydrogen gas. The vessel has a series of discharge ports on the upper part, and a conversion facility is located in an area of high greenhouse gas concentration. The barium hydroxide reacts with carbon dioxide to produce barium carbonate, which is sold along with the discharge water to generate revenue. The method provides a promising solution for mitigating the effects of climate change by reducing carbon emissions from the atmosphere.

The invention provides a composite coating on the inner wall of a crucible for polycrystalline silicon ingot casting, a preparation method of the composite coating and the crucible, and belongs to the technical field of crucible coatings, and the composite coating on the inner wall of the crucible for polycrystalline silicon ingot casting comprises a first sealing layer, an isolation layer and a second sealing layer which are sequentially arranged on the inner wall of the crucible in a stacked mode; each of the first sealing layer and the second sealing layer comprises barium hydroxide and deionized water, and the weight ratio of the barium hydroxide to the deionized water is (10-50): (500-2000); the isolating layer comprises tantalum carbide powder, deionized water, methyl methacrylate, acrylic acid and silica sol, and the weight ratio of the tantalum carbide powder to the deionized water to the methyl methacrylate to the acrylic acid to the silica sol is (500-1500): (1000-3000): (10-100): (50-70): (100-1000), so that the molten silicon is effectively blocked, and the risk of introducing inclusions due to self decomposition of the coating is remarkably reduced; therefore, the overall quality of the polycrystalline silicon ingot casting is improved.

A method for producing lithium iron phosphate from waste lithium iron phosphate material is provided. [Solution] The method includes the steps of: crushing the positive electrode sheet of a waste lithium iron phosphate battery, sieving it to obtain lithium iron phosphate raw material, dissolving it in an acidic solution, and collecting the first filtrate after filtration; adding ferrous sulfate solution to the first filtrate to obtain a mixed solution; adding hydrogen peroxide solution and ammonia aqueous solution to the mixed solution, filtering and washing after the reaction to obtain a second filtrate and a filtration cake; washing and drying the filtration cake to obtain iron hydroxyphosphate; adding barium hydroxide aqueous solution to the second filtrate, allowing it to react completely and then filtering to obtain a third filtrate; adding phosphoric acid solution to the third filtrate to obtain a fourth filtrate; mixing iron hydroxyphosphate, the fourth filtrate and a carbon source, sanding the slurry, drying and obtaining a powder; and sintering and pulverizing the powder in an inert atmosphere to obtain a carbon-coated lithium iron phosphate material.

The invention discloses a modified barium-based heat and energy storage material based on copper-coated porous carbon and a preparation method of the modified barium-based heat and energy storage material. The method comprises the following steps: preparing a phase change heat storage material barium hydroxide octahydrate and a nucleating agent nano copper powder according to a ratio, carrying out a series of steps such as melting, cooling and grinding to obtain mixed powder, melting the mixed powder, immersing the molten mixed powder into copper-coated porous carbon, and solidifying to obtain the modified barium-based heat storage and energy storage material. The phase change latent heat of the material is 271.0 J / g, the degree of supercooling is as low as 1.6 DEG C, the heat conductivity coefficient and the phase separation condition are improved, the material can be used for storing unstable renewable energy sources, the utilization rate of new energy sources is increased, and the material has a wide application prospect.

The application provides a kind of nano-reinforced internal curing anti-sulfate cave slag concrete and its preparation method, relating to the technical field of building materials, according to weight parts, the raw materials of the concrete include: Portland cement 100-500 parts, cave slag stone powder 30-300 parts, fine aggregate 1000-1500 parts, nano Fe2O3 1-5 parts, water-absorbing resin 0.5-2 parts, barium hydroxide 3-5 parts and water 200-300 parts.The nano-reinforced internal curing anti-sulfate cave slag concrete provided by the application realizes the replacement of cement by cave slag stone powder, can effectively reduce CO2 emission, has good mechanical properties and working performance, excellent anti-sulfate erosion performance and other characteristics, improves the service performance of concrete structure, greatly improves the service life of building, and is especially suitable for bridge engineering and other engineering construction with high requirements for building life.

The invention relates to the technical field of polypropylene manufacturing, and particularly discloses a high-temperature-resistant impact-resistant light polypropylene granular material which comprises the following components: 100-120 parts of polypropylene, 20-30 parts of an improved tackifier, 20-30 parts of a reinforced complex, 2-5 parts of a thixotropic agent and 2-5 parts of a foaming agent, wherein raw materials for preparing the reinforced complex comprise the following components in parts by weight: 50-60 parts of sodium silicate, 15-20 parts of sulfuric acid, 3-5 parts of tert-butyl alcohol, 2-3 parts of ethylene glycol and 90 parts of nitrogen; raw materials for preparing the improved tackifier comprise the following components in parts by weight: 25-35 parts of p-tert-octylphenol, 100-110 parts of toluene and 1-3 parts of barium hydroxide. The polypropylene granular material prepared in the invention has good high temperature resistance and excellent impact resistance.

The invention relates to the technical field of phenolic resin synthesis, and discloses low-free-phenol and high-crosslinking-degree phenolic resin, and particularly relates to phenolic resin taking phenol and a formaldehyde solution as raw materials, barium hydroxide as a catalyst and sulfuric acid as a neutralizer and a preparation method of the phenolic resin. According to the method, the content of free phenol in the resin is smaller than or equal to 05%, the bending strength after curing is larger than or equal to 90 MPa, and the carbon residue rate at 800 DEG C is larger than or equal to 45% by regulating and controlling the dosage of phenol, a formaldehyde solution and a catalyst and accurately controlling the specific reaction process. The method is suitable for the fields of high-temperature-resistant molding compounds and insulating materials. The method solves the problems of high free phenol content and insufficient hinge density of the traditional phenolic resin, and is simple and controllable in process and suitable for industrial production.