99 results about "Barium hydroxide" patented technology

The invention provides a concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention discloses a corrosion-resistant polypropylene edge band material and a preparation method thereof, and belongs to the technical field of preparation of edge band materials. The corrosion-resistant polypropylene edge sealing strip material is prepared from, by weight, 50-75 parts of polypropylene, 2-5 parts of an antioxidant, 3-6 parts of a corrosion-resistant agent, 2-4 parts of a composite flame retardant, 8-15 parts of calcium carbonate and 2-4 parts of dye, the corrosion-resistant agent is prepared from 2, 6-dichlorobenzonitrile, 1, 2, 4-triazole, a sulfuric acid solution, sodium nitrite and parachloroaniline, and the corrosion-resistant agent is prepared from 2, 6-dichlorobenzonitrile, 1, 2, 4-triazole, a sulfuric acid solution, sodium nitrite and parachloroaniline. The composite flame retardant is prepared from 3-glycidyl ether oxypropyl trimethoxy silane, diphenyl silanediol, barium hydroxide and boric acid. The edge band material prepared by the method has excellent corrosion resistance, flame retardance, heat resistance and mechanical properties.

The invention 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 preparation method comprises the following steps: mixing polyether polyol, isocyanate, a chain extender A, a chain extender B, a crystallization promoting agent, a surface drying promoting agent and an auxiliary agent, and carrying out extrusion granulation, wherein the chain extender A is obtained by carrying out a reaction on acrylamide and diethanol amine and then carrying out siloxane modification on the reaction product by utilizing methacryloyloxymethyltrimethoxysilane; and the chain extender B is obtained by reacting tetrakis hydroxymethyl phosphonium sulfate and barium hydroxide octahydrate and oxidizing by hydrogen peroxide. The prepared hot melt adhesive has better viscosity and also has a certain flame-retardant effect.

The present invention belongs to the technical field of chemical separation and purification, and specifically relates to a method for removing impurities from a hydroxylamine aqueous solution. The method for removing impurities from a hydroxylamine aqueous solution provided by the present invention comprises the following steps: mixing a hydroxylamine aqueous solution and an alkaline compound for sedimentation and then performing solid-liquid separation to obtain a liquid phase; the alkaline compound comprises barium hydroxide or calcium hydroxide; the liquid phase is passed through an ion exchange column for ion exchange to obtain a purified hydroxylamine aqueous solution; the resin in the ion exchange column is a resin containing phenolic hydroxyl groups. The phenolic hydroxyl-containing resin used in the present invention is easy to obtain, has a wide range of sources, and has low cost. The present invention first uses an alkaline solution to remove sulfate or phosphate in a hydroxylamine aqueous solution, and then uses a phenolic hydroxyl-containing resin to efficiently, quickly, and conveniently remove metal ions in the hydroxylamine aqueous solution without reacting with hydroxylamine. The impurity removal method provided by the present invention has the advantages of simple operation and obvious purification effect, and has good industrial prospects.

The invention discloses a barium titanate coated Ni particle material synthesized under the assistance of a spray drying technology and a method thereof, and belongs to the technical field of metal powder material preparation. The method comprises the following steps: firstly, taking metatitanic acid and barium hydroxide as raw materials, and mixing the metatitanic acid and the barium hydroxide with nano and submicron Ni powder to prepare a mixed solution; secondly, synthesizing a Ni-based composite material intermediate by adopting a spray drying method; and finally, sintering in a tubular furnace to form the barium titanate coated Ni powder. The barium titanate coated Ni inner electrode material is Ni coated BaTiO3 spherical particles with a core-shell structure, the particles are of a core / shell microstructure, a shell layer is a barium titanate coating layer with the thickness of 10-15 nm, and the particle size of the particles is 100-150 nm. According to the method, required equipment can be scaled, components and microstructures are easy to regulate and control, and the method has high sphericity and dispersity, high compactness and good repeatability; the particle size and distribution can be changed by adjusting process parameters; meanwhile, good interface bonding with a ceramic dielectric layer is realized, and the key problems of mismatching of interlayer interface volume shrinkage, easy cracking and the like in the sintering process are relieved.

The invention provides a method for preparing lithium iron phosphate by recovering a waste lithium iron phosphate material, which comprises the following steps: crushing a waste lithium iron phosphate battery positive plate, vibrating and sieving to obtain a lithium iron phosphate raw material, dissolving in an acid solution, filtering, and collecting a first filtrate; adding a ferrous sulfate solution into the first filtrate to obtain a mixed solution; adding hydrogen peroxide and an ammonia water solution into the mixed solution to adjust the pH value, filtering and washing after reaction to respectively obtain a second filtrate and a filter cake, and washing and drying the filter cake to obtain iron hydroxyphosphate; adding a barium hydroxide solution into the second filtrate, and filtering after complete reaction to obtain a third filtrate; adding a phosphoric acid solution into the third filtrate to obtain fourth filtrate; mixing the hydroxyl iron phosphate, the fourth filtrate and a carbon source, sanding the slurry, and drying to obtain powder; and sintering the powder in an inert atmosphere, naturally cooling and crushing to obtain the carbon-coated lithium iron phosphate material.

The invention discloses a preparation method of a novel phase change aerogel heat insulation pad, which comprises the following steps: A, at a certain temperature, adding a phase change material, a heat conduction material, an opacifying agent and a flame retardant into a beaker according to a certain proportion, and uniformly stirring; b, immersing a base material into the solution to obtain a phase change aerogel heat insulation pad; c, combining the phase change material with the silicon dioxide aerogel heat insulation pad by utilizing a sandwich structure; d, the phase-change aerogel heat insulation pad of a novel structure is obtained after packaging is conducted through a packaging material, and the phase-change material is prepared from, by weight, 8-12 parts of paraffin, 8-12 parts of octadecanol, 8-12 parts of polyethylene glycol, 8-12 parts of silica sol, 8-12 parts of calcium chloride hexahydrate, 8-12 parts of sodium sulfate decahydrate, 8-12 parts of sodium hydrogen phosphate decahydrate, 8-12 parts of barium hydroxide octahydrate and 8-12 parts of magnesium chloride hexahydrate. And 6-10 parts of octadecanol. The base material, the phase change material, the heat conduction material, the opacifying agent and the flame retardant are adopted as raw materials, and the prepared heat insulation pad has good inhibiting and delaying effects on thermal runaway in the battery module.

The invention discloses subsea tunnel hole slag aggregate, a preparation method thereof and concrete containing the subsea tunnel hole slag aggregate, and belongs to the technical field of building materials. The preparation method of the modified subsea tunnel hole slag aggregate comprises the following steps: S1, soaking the subsea tunnel hole slag aggregate in a barium hydroxide solution, taking out the subsea tunnel hole slag aggregate, then soaking the subsea tunnel hole slag aggregate in a sodium silicate solution, and taking out the subsea tunnel hole slag aggregate and drying the subsea tunnel hole slag aggregate; s2, soaking in an ethyl cellulose solution, taking out, drying, soaking in an ion exchange chitosan gel solution, taking out, and drying, so as to obtain a finished product; the ion exchange chitosan gel solution is prepared from nitrate radical intercalation Mg-Al-LDHs (layered double hydroxides) and chitosan hydrogel. The subsea tunnel hole slag aggregate is sequentially subjected to modification treatment of weakening sulfate ion competition, blocking micro-cracks, wrapping controlled-release chloride ions and ion exchange curing chloride ions, so that the influence of double defects of high chloride ion content and multiple cracks of the subsea tunnel hole slag aggregate on the performance of the concrete is weakened; the service life of an engineering structure is prolonged, and high-value utilization of solid waste is achieved.

The invention discloses a steel casting heat treatment process which comprises the following steps: step 1, heating a steel casting to a complete austenitizing temperature (30-50 DEG C above Ac3), and preserving heat; secondly, the austenitized steel casting is discharged out of the furnace, an aqueous solution quenching mode is adopted, the steel casting is rapidly cooled, and the steel casting is rapidly cooled through an aqueous solution, taken out and left to stand till the steel casting is cooled to the room temperature; and thirdly, the cooled steel casting is subjected to high-temperature tempering at the temperature of 500-650 DEG C, and heat preservation is conducted. The steel casting is subjected to heat treatment by adopting annealing, quenching and tempering processes, and barium hydroxide is added in the aqueous solution in the quenching process step, so that the cooling capacity of the aqueous solution can be improved, and the problem of corrosion of the steel casting does not need to be worried about.

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 belongs to the technical field of radioactive waste treatment, and discloses a ceramic solidified body for synergistically solidifying radioactive iodine and cesium as well as a preparation method and application of the ceramic solidified body. The chemical formula of the ceramic solidified body is (Cs2xBa2-2x) (AgyNa1-y) IO6, x is equal to 0.1-0.9, y is equal to 0.1-0.9, and the ceramic solidified body is prepared by mixing silver iodide, barium hydroxide, sodium periodate and cesium carbonate, carrying out dry pressing molding under 20-60 MPa to obtain a rough blank, sintering at 500-700 DEG C, carrying out cold sintering at 200-300 DEG C, and finally annealing at 500-600 DEG C. The curing amount of iodine in the ceramic cured body is 2.4-20 wt%, the curing amount of cesium is 4-46 wt%, and the ceramic cured body has excellent chemical stability and is suitable for curing radioactive iodine and cesium and long-term geological treatment.

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 invention relates to the technical field of concrete, in particular to concrete with high sulfate attack resistance and a preparation method thereof. The invention provides concrete with high sulfate attack resistance, which is prepared from the following components in parts by weight: 250 to 340 parts of Portland cement, 75 to 100 parts of fly ash, 100 to 125 parts of mineral powder, 1250 to 1450 parts of coarse aggregate, 640 to 720 parts of fine aggregate, 50 to 60 parts of epoxy resin, 15 to 25 parts of silica fume, 2 to 3 parts of barium hydroxide, 7 to 12 parts of organic phosphonate grafted polypropylene fiber, 2 to 3 parts of polycarboxylate superplasticizer, 1.5 to 2 parts of defoaming agent and 160 to 180 parts of water. The organic phosphonate grafted polypropylene fiber is obtained by carrying out esterification reaction on diglycolamine dimethylene phosphonate and maleic anhydride grafted polypropylene fiber, wherein the diglycolamine dimethylene phosphonate is prepared by reacting diglycolamine, phosphorous acid and formaldehyde. The concrete prepared by the invention has good sulfate corrosion resistance.

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 present invention discloses a high thermal conductivity shaped composite phase change material and a preparation method thereof, belonging to the field of phase change heat storage. The composite phase change material is made of foam metal filled with a modified phase change material, wherein the modified phase change material is composed of the following components by mass percentage: 98.7~99.3% barium hydroxide octahydrate, 0.2~0.8% nano copper oxide, and 0.5% thickener. The phase change temperature of the modified phase change material is 77.5°C, the phase change latent heat is 277.3J / g, and the thermal conductivity of the composite phase change material is 12.4W / (m·K). The present invention has the advantages of high latent heat and high thermal conductivity, can meet the actual needs of various engineering projects, and solves the problems of poor stability and low thermal conductivity of barium hydroxide octahydrate as a phase change material.

The present invention discloses a large-volume concrete hydration heat inhibitor, its preparation method and application, and belongs to the technical field of concrete admixtures. The hydration heat inhibitor includes a dissolving heat absorbing material, a temperature-controlling heat absorbing material, an intelligent heat-controlling material and a hydration reaction regulating material; wherein, the dissolving heat absorbing material includes at least one of calcium nitrate, ammonium nitrate and potassium nitrate; the temperature-controlling heat absorbing material includes sodium thiosulfate, paraffin and barium hydroxide octahydrate; the intelligent heat-controlling material is obtained by wrapping the dissolving heat absorbing material with polyethylene glycol; the hydration reaction regulating material is a calcium-complexed sulfonated dextrin. Under the joint action of the dissolving heat absorbing material, the temperature-controlling heat absorbing material, the intelligent heat-controlling material and the hydration reaction regulating material, the large-volume concrete hydration heat inhibitor of the present invention can realize step-by-step regulation of the hydration heat of large-volume concrete, significantly reduce the hydration heat of large-volume concrete, and effectively control the temperature cracks of large-volume concrete.

The invention discloses a method for extracting scandium from a byproduct FeSO4 # imgabs0 # H2O in a sulfuric acid process titanium dioxide waste acid concentration process, and belongs to the field of valuable resource recovery. The method comprises the following steps: mixing and dissolving FeSO4 # imgabs1 # H2O and water, filtering to obtain a ferrous sulfate solution, freezing, crystallizing and filtering to obtain a scandium-containing solution, and circulating for multiple times to increase the scandium concentration; then ferric iron in the solution is reduced, the pH is adjusted with barium hydroxide, scandium is precipitated, and a mixed solid of barium sulfate and scandium hydroxide is separated out; the method comprises the following steps: dissolving scandium hydroxide with acid, filtering and washing, precipitating scandium with oxalic acid or sodium oxalate, and finally roasting scandium oxalate at high temperature to prepare scandium oxide with Sc2O3 greater than or equal to 99.99% and Sc2O3 / REO greater than or equal to 99.9999%. The method has the advantages of being convenient to operate, simple in technological process, low in production cost and good in environmental protection benefit, industrialization is easy, the scandium element in the sulfuric acid process titanium dioxide waste acid concentration byproduct can be efficiently recycled, and efficient utilization of resources is achieved.

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 belongs to the technical field of phosphate binders, and discloses a magnesium phosphate inorganic adhesive and a preparation method and application thereof, the magnesium phosphate inorganic adhesive comprises the following components by mass: 100 parts of dead burned magnesium oxide, 45-80 parts of potassium dihydrogen phosphate, 1-5 parts of an organic acid metal chelating agent, 1-5 parts of potassium hydroxide, 1-4 parts of borax, 0.7-1.5 parts of calcium chloride hexahydrate, 0.4-0.6 part of barium hydroxide octahydrate, and 20-32 parts of water. The magnesium phosphate inorganic adhesive is modified on the basis of raw material selection and mix proportion design, so that the coagulation time and fluidity of the magnesium phosphate inorganic adhesive are greatly improved, and the problems that the traditional magnesium phosphate inorganic adhesive is short in coagulation time and poor in fluidity, and cannot meet the construction requirements of the adhesive on sufficient infiltration and spreading of carbon fiber cloth are solved; the construction workability of the magnesium phosphate inorganic adhesive serving as the adhesive for reinforcing the carbon fiber cloth is guaranteed, and the magnesium phosphate inorganic adhesive can be applied to the field of reinforcing and repairing of large-quantity and wide-area concrete structures.

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.

A process for the production of barium titanate powder, comprising the following steps: Addition of an aqueous slurry of anatase titanium dioxide hydrate, which has a specific surface area according to BET in the range of 200 m² 2 / g up to 400 m 2 / g and exhibits a half-width of diffraction of the (101) plane measured by X-ray diffraction in the range of 2.3° to 5.0°, to an aqueous solution of barium hydroxide, while the aqueous solution of barium hydroxide is maintained at a temperature in the range of 80 °C up to its boiling point under normal pressure in order to cause a reaction of the barium hydroxide with the titanium oxide hydrate and thereby obtain an aqueous suspension of barium titanate precursor; and Performing a hydrothermal treatment with the barium titanate precursor thus obtained for a period of not less than 24 hours, yielding barium titanate particles.

The application relates to the technical field of cable connectors, and discloses an integrated cable connector which comprises a bottom plate, a mounting frame located above the bottom plate, and a connector body located in the mounting frame, wherein the side surface of the connector body is provided with a connecting assembly; the inner side of the mounting frame is provided with a cooling assembly, the cooling assembly 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 inner side top surface of the mounting frame, and an adding pipe is arranged above the reaction box. Through the heat dissipation assembly, the connector body vibration pushes the push rod, the air pipe blows the adjusting plate to move downwards, the eight-water barium hydroxide powder in the partition plate enters the bottom of the reaction box through the through hole, the eight-water barium hydroxide powder is mixed with the ammonium chloride powder to react and absorb heat, 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 application relates to a spray drying technology assisted synthesis of barium titanate coated Ni particle material and a method thereof, and belongs to the technical field of metal powder material preparation. The method comprises the following steps: firstly, preparing a mixed solution by mixing metatitanic acid, barium hydroxide and nano and submicron Ni powder; secondly, synthesizing a Ni-based composite material intermediate by adopting a spray drying method; and finally, forming barium titanate coated Ni powder after sintering in a tube furnace. The barium titanate coated Ni inner electrode material is Ni@BaTiO3 spherical particles with a core-shell structure, the particles are core / shell microstructure, the shell layer is a barium titanate coating layer with a thickness of 10-15 nm, and the particle size is 100-150 nm. The required equipment can be scaled, the composition and microstructure are easy to control, the spherical degree and dispersity are high, the compactness is high, the repeatability is good, the particle size and distribution can be changed by adjusting process parameters, the oxidation resistance can be improved, good interface combination between the ceramic dielectric layer and the barium titanate coated Ni inner electrode material can be realized, and key problems such as mismatching of interfacial volume shrinkage and easy cracking in the sintering process can be solved.

The invention discloses a method for removing carbonate in a sodium aluminate solution, and relates to the technical field of sodium aluminate solution purification, and the method comprises the following steps: obtaining a barium hydroxide solution with a set mass concentration, and using barium hydroxide as a carbonate remover to prepare a reaction solution; adding the barium hydroxide solution into a sodium aluminate solution, so that the barium hydroxide and carbonate in the sodium aluminate solution are subjected to precipitation reaction to generate barium carbonate precipitate, thereby obtaining a mixed solution containing the precipitate; and carrying out solid-liquid separation on the mixed solution to obtain a sodium aluminate refined solution with carbonate removed and a barium carbonate precipitate. The method is simple and easy to implement, the removal cost of carbonate radicals is effectively reduced, and resources and energy are saved. Meanwhile, sodium hydroxide generated by the reaction of sodium carbonate and barium hydroxide can be used as a beneficial supplement in the production of aluminum hydroxide, so that the reutilization of resources is realized, and the total cost of carbonate removal is further reduced.

The invention relates to the technical field of a precursor for a lithium nickel manganese oxide positive electrode material, in particular to a method for preparing a lithium nickel manganese oxide precursor by using a by-product manganese salt, which comprises the following steps: carrying out barium hydroxide coagulation treatment on the by-product manganese salt and a crude nickel salt with low raw material price to obtain a primary filtrate, and then carrying out manganese fluoride treatment to obtain a secondary filtrate; a nickel manganese carbonate material with a micro-nano spherical structure can be prepared from a qualified water-phase solution obtained after tributyl phosphate is extracted and oil-water separation by adopting an ethanol-water mixed liquid-phase reaction system under the assistance of a surfactant and process conditions, an oil-phase solution is subjected to metal manganese reverse extraction to obtain a filter residue, namely manganese fluoride, and an oil phase is returned to an extracting agent again, so that the nickel manganese carbonate material with a micro-nano spherical structure is obtained. The waste water and the waste residue produced by the method can be returned to the process flow for reuse, so that the environmental pollution is small. The obtained product manganese sulfate solution can reach the standard of battery-grade manganese sulfate, the fluorine content of the solution is low, and the prepared nickel manganese carbonate precursor is high in purity and is superior to that of an existing process.

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 discloses a low-temperature synthesis method of nano fluorescent powder based on a BaO-SiO2 system, and belongs to the technical field of nano oxide preparation. According to the invention, BaH2SiO4 nanocrystals are directly synthesized through an alcohol-water solution, and then the BaH2SiO4 nanocrystals and residual barium hydroxide are calcined at a low temperature to synthesize the nano fluorescent powder of a BaO-SiO2 system. The method comprises the following steps: adding a salt of an activator element and tetraethoxysilane into a proper amount of alcohol according to a certain proportion, then adding into a water-alcohol mixed base solution which contains barium hydroxide and has a proper proportion, stirring and hydrolyzing at a certain temperature, and continuously reacting for a certain time to directly synthesize the BaH2SiO4 nanocrystal in the solution. And calcining with residual barium hydroxide at low temperature to synthesize the nano fluorescent powder. According to the method, the required silicate pure-phase nano fluorescent powder can be synthesized only through low-temperature calcination, so that the performance is greatly improved, the energy consumption is reduced, meanwhile, crystal grain growth caused by high temperature of the powder is avoided, and a good foundation is laid for subsequent application of the powder.

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 a barium calcium sulphoaluminate cement clinker based on barium hydroxide sulfur fixation and a preparation method thereof. The barium calcium sulphoaluminate cement clinker is obtained by firing a cement raw material containing sludge, and the cement raw material is prepared from the following components in parts by weight: 30 to 60 parts of dried sulfur-containing sludge, 20 to 50 parts of CaO, 5 to 25 parts of SiO2, 5 to 40 parts of Al2O3, 3 to 18 parts of Fe2O3 and 10 to 25 parts of Ba (OH) 2. The preparation method comprises the following steps: preparing a mixture of cement raw materials in parts by weight to obtain raw material powder; carrying out high-temperature calcination on the raw material powder until all minerals are completely formed, and cooling to room temperature in a quenching manner, so as to obtain the barium calcium sulphoaluminate cement clinker. Compared with the prior art, the method has the advantages that barium hydroxide is applied to the sulfur fixation process for preparing the cement clinker through sludge combustion co-treatment, accumulation of municipal sewage sludge can be reduced, the sulfur fixation rate can be increased, and high-value cyclic utilization of waste resources is promoted.