70 results about "Barium dichloride" patented technology

The invention relates to the technical field of barium chloride production and preparation, in particular to a purification method of electronic-grade barium chloride, which comprises the following steps: S1, washing witherite tailing barium slag with hydrochloric acid to obtain barium-containing filter residue; s2, mixing the barium-containing filter residues with hydrochloric acid, and performing leaching treatment to obtain a crude barium chloride product; s3, dispersing the barium chloride crude product in water, adjusting the pH value of the solution, adding an impurity removal agent, carrying out ultrasonic-assisted segmented temperature control treatment, and filtering to obtain a barium chloride solution; and S4, adding a crystal form control agent into the barium chloride solution, and performing programmed cooling crystallization under the action of a low-intensity direct-current electric field to obtain the electronic-grade barium chloride. According to the technical scheme, efficient conversion and precise impurity separation of the barium slag difficult to treat are achieved, the technical problems that in a traditional method, the barium recovery rate is low, impurity removal is difficult, and the product purity is unstable are solved, and the resource utilization rate of barium is remarkably increased.

The present application relates to the technical field of extracting rare earth, and particularly relates to an extraction rare earth separation process method. Fluorine-carbon cerium ore crude ore is treated to obtain activated ore powder. The activated ore powder is subjected to alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching to obtain a purified liquid. The purified liquid is then subjected to barium chloride sulfuric acid removal, lead removal by sulfurized lead, pH adjustment and the like to obtain a low-impurity chlorinated rare earth liquid. The chlorinated rare earth liquid is subjected to multi-stage extraction to obtain a neodymium chloride solution, a praseodymium-neodymium chloride solution and a lanthanum-cerium chloride solution. The solutions are subjected to oxalic acid precipitation and calcination to obtain a rare earth oxide product. The present application adopts fine pretreatment, multi-stage differential extraction and purification processes to achieve efficient separation of lanthanum-cerium, praseodymium-neodymium and neodymium in fluorine-carbon cerium ore and improve product purity.

The present invention relates to a method for recovering valuable materials from waste. The method for recovering valuable materials from waste comprises the steps of: (a) pulverizing waste, which is generated from an evaporator or a crystallizer among equipment of a zero liquid discharge process for desulfurization wastewater, and then injecting same into a dissolution tank so as to dissolve same in a solvent and separating same into a gypsum (CaSO4) precipitate and a supernatant from which the gypsum has been removed; (b) dissolving, in a desulfurization tank, barium chloride (BaCl2) in the supernatant from which the gypsum has been removed, and separating same into a barium sulfate (BaSO4) precipitate and a supernatant from which the barium sulfate has been removed; (c) dissolving, in a hydroxide tank, sodium hydroxide (NaOH) in the supernatant from which the barium sulfate has been removed, and separating same into a magnesium hydroxide (Mg(OH)2 precipitate and a supernatant from which the magnesium hydroxide has been removed; and (d) injecting, into a salt pond, the supernatant from which the magnesium hydroxide has been removed, so as to recover sodium chloride (NaOH).

The invention provides a roasting conversion method of ionic rare earth acid-soluble slag, which comprises the following steps: (1) mixing the ionic rare earth acid-soluble slag and an alkaline medium to ensure that the water content of the mixed material is 20-30%, and then granulating to obtain a granulated mixture; (2) loading the granulated mixture into a customized sagger, and carrying out a roasting reaction; (3) after the roasting reaction is finished, stripping the customized saggar from the clinker to obtain preparatory slag; and (4) sequentially carrying out water washing, acid leaching and solid-liquid separation on the preparatory slag to obtain rare earth-barium chloride-rich feed liquid and acid-soluble residues. According to the method, the process problem that the roasted clinker and the sagger are difficult to separate is effectively solved, the yield of the roasted clinker is high, the total weight reduction rate of the acid-soluble slag is high, and the barium leaching rate and the rare earth leaching rate are high; the dissipation of radioactive dust is reduced, and the industrial application prospect is good.

The invention discloses a preparation method of a barium-based hydrophobic oxygen production molecular sieve, which comprises the following steps: S1, fully mixing a sodium metaaluminate solution, potassium hydroxide, sodium silicate and deionized water, and carrying out hydrothermal reaction and centrifugal calcination to obtain a sodium-based molecular sieve; s2, uniformly mixing the sodium-based molecular sieve and a barium chloride solution, and performing hydrothermal reaction to obtain a barium-based molecular sieve; s3, mixing and stirring the barium-based molecular sieve and a phenyltrimethoxysilane solution to obtain the barium-based hydrophobic oxygen generation molecular sieve. The hydrophobicity of the molecular sieve can be improved, and the adsorption efficiency and the service life of the molecular sieve in a high-humidity environment are effectively improved.

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 belongs to the technical field of refined aluminum preparation, and particularly relates to a preparation method of an electrolyte for preparing refined aluminum through a three-layer liquid electrolysis method. The method comprises the following steps: mixing electrolyte raw materials, and sequentially carrying out melting-pre-purification treatment and electrolytic purification treatment to obtain a purified electrolyte; and carrying out vacuum extraction on the purified electrolyte to obtain the electrolyte for preparing the refined aluminum by the three-layer liquid electrolysis method, the electrolyte is prepared from the following raw materials in percentage by mass: 60 to 61 percent of barium chloride, 23 to 24 percent of cryolite, 12 to 13 percent of aluminum fluoride and 3 to 4 percent of sodium chloride. Impurities are removed through electrolytic purification, the prepared electrolyte has reasonable primary crystal temperature, molecular ratio and electric conductivity, the phenomena of upturning, firing and more precipitates generated in the refined aluminum production process of the electrolyte can be greatly reduced, the quality grade of refined aluminum is improved, and the electricity unit consumption of refined aluminum liquid is reduced.

The utility model discloses a multi-stage filtering device for barium chloride liquid, and relates to the technical field of multi-stage filtering of the barium chloride liquid. A spiral flow deflector is arranged on the inner wall of the liquid conveying pipeline, the top of the spiral flow deflector is installed on the inner wall of the liquid conveying pipeline through at least two installation structures, and a gap exists between the bottom of the spiral flow deflector and the axis of the liquid conveying pipeline. The mounting structure comprises an annular fixing ring and a plurality of supporting rods movably connected with the annular fixing ring, the annular fixing ring is arranged on the inner wall of the liquid conveying pipeline, and the supporting rods are evenly distributed along the annular fixing ring. The ends, away from the annular fixing ring, of the multiple supporting rods are connected with different positions of the top of the spiral flow deflector correspondingly. The spiral drainage piece is stably arranged through the installation structure, disassembly is easy, turbulent flow and vortex can be effectively reduced, flowing is more stable, and the blocking risk is reduced.

The invention discloses a recovery method of a catalyst containing platinum, silver, chromium, vanadium, molybdenum and aluminum, which comprises the following steps: uniformly mixing a waste catalyst, caustic alkali and iron powder, reacting at high temperature, cooling to obtain a melt, dissolving the melt, and filtering to obtain a first filter residue and a first filtrate; dissolving the first filter residue with nitric acid, and filtering to obtain platinum-containing waste filter residue and second filtrate; adding a sodium chloride solution into the second filtrate, and filtering to obtain silver chloride filter residues and third filtrate which contains chromic nitrate; adding a barium chloride solution into the third filtrate, reacting at room temperature, and filtering to obtain barium chromate solid filter residues and fourth filtrate; adjusting the pH value of the first filtrate to 7-8 by using an acid, reacting at room temperature, and filtering to obtain activated aluminum oxide filter residues and a fifth filtrate; adding ammonium chloride into the fifth filtrate, reacting at room temperature, and filtering to obtain ammonium vanadate filter residues and sixth filtrate; and adjusting the pH value of the sixth filtrate to be less than 1 by using sulfuric acid, reacting at room temperature, and filtering to obtain molybdic acid filter residues and a seventh filtrate.

The invention belongs to the technical field of inorganic materials, and particularly relates to a preparation method of high-purity barium carbonate. High-purity barium carbonate is prepared from a barium chloride solution and an ammonium bicarbonate solution through a coprecipitation method, a crystal form control agent is added into the barium chloride solution in advance, and a surfactant is added into the ammonium bicarbonate solution, so that an auxiliary agent is adsorbed to a potential crystal nucleus site in advance, the liquid phase interfacial tension is reduced, and the uniformity of a barium carbonate precipitation reaction is ensured; hyperbranched polycarboxylic acid and tartaric acid are compounded to form a crystal form control agent, polyacrylic acid and citric acid are compounded to form a composite dispersing system, the crystal form control agent, a surfactant and a composite dispersing agent are added, and the pH value in the reaction process is controlled, so that the prepared barium carbonate has higher purity and sphericity and narrower particle size distribution.

The utility model relates to an auxiliary device for packing barium chloride powder, which belongs to the technical field of barium chloride production and comprises a base and a mounting box fixedly connected to the top of the base, and a bag opening clamping device used for clamping a bag opening of a woven bag is arranged outside the mounting box. The top of the base is provided with an overturning mechanism for overturning and transferring the woven bag; and the bag opening clamping device comprises a hopper arranged outside the mounting box, and the exterior of the hopper is fixedly connected with a fixing frame. According to the barium chloride powder packaging auxiliary device, through cooperative use of an electric push rod and a clamping block, a bag opening of a woven bag can be firmly clamped to prevent the bag opening from sliding, the smooth proceeding of the charging process is ensured, a servo motor is started through a controller to work to drive a threaded rod to rotate, and the threaded rod rotates to drive a moving block to move; and vertical movement of the fixing frame and the hopper is achieved, then barium chloride powder bagging is completed, manual intervention is reduced, the packaging efficiency is improved, and the advantage of high packaging efficiency is achieved.

The invention discloses a rare earth radioactive slag reduction and barium sulfate slag recycling method based on transformation and decomposition of barium sulfate. The method comprises the following steps: drying, ball-milling and screening rare earth radioactive slag, adding water into sodium hydroxide, and mixing to obtain rare earth slag; roasting and transforming the rare earth slag under the condition of introducing carbon dioxide; washing the roasted and transformed rare earth slag with water; the washed rare earth slag is subjected to acid dissolution and solid-liquid separation, and high-silicon slag without radioactive elements and an acid solution with the radioactive elements are obtained; sulfuric acid is added into the acid solution step by step for fractional precipitation and radium removal, and barium and radium residues containing radioactive elements and barium sulfate residues without radioactivity are obtained through solid-liquid separation; adjusting the mass ratio of the barium sulfate slag and sodium hydroxide, then carrying out alkali conversion and acid dissolution to obtain a barium chloride solution, and recycling the barium chloride solution for removing sulfate radicals from the rare earth feed liquid. According to the method, barium sulfate in the rare earth radioactive slag can be transformed into more than 95% of soluble barium salt, the amount of the rare earth radioactive slag is reduced by more than 85%, and the barium circulation rate reaches more than 90%.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a mixed acid-based electrolyte and a preparation method and application thereof.The preparation method at least comprises the following steps that a sulfuric acid-based vanadium electrolyte is prepared through a chemical reduction-electrolysis method, the sulfuric acid-based vanadium electrolyte is poured into a rotary container of a rotary evaporator, rotary evaporation operation is conducted, and the mixed acid-based electrolyte is obtained; adding a barium chloride solution into the sulfuric acid-based vanadium concentrated solution, fully stirring to obtain a sulfate acid-based vanadium crude solution, filtering the sulfate acid-based vanadium crude solution by using a microfiltration membrane to obtain a filtrate, namely the sulfate acid-based vanadium concentrated solution, adding deionized water into the sulfate acid-based vanadium concentrated solution, diluting the concentrated solution, and filtering to obtain the sulfate acid-based vanadium sulfate. The mixed acid group vanadium electrolyte has the advantages of being high in energy density, wide in use temperature range and good in vanadium stability, and the problems that the hydrochloric acid concentration is difficult to control accurately and the environment is polluted due to hydrochloric acid volatilization and chlorine evolution during electrolysis in a conventional method are solved.

The utility model discloses a kind of solid waste treatment device for preparing electronic grade barium chloride using industrial barium carbonate barium residue, is related to solid waste treatment technical field, including processing box and solid waste crushing mechanism, the side of the processing box is provided with first accommodating cavity, the side surface of the rolling gear is engaged and is connected with fixed gear.The solid waste treatment device for preparing electronic grade barium chloride using industrial barium carbonate barium residue, the rotation of sliding rod makes rolling gear roll along the outside of fixed gear, so as to drive reciprocating screw rod to drive moving sleeve to make sliding rod carry hammerhead to occur reciprocating displacement in rotor disc inside, so that hammerhead is no longer single trajectory when rotating in processing box inside, and because of the change of hammerhead rotating track, the big particle barium residue originally located between hammerhead can be fully stressed to realize crushing, so as to solve the problem that barium residue cannot be stressed to crush due to sliding trajectory located between hammerhead, so as to effectively improve the crushing efficiency of barium residue.

The invention discloses a method for detecting the content of sulfate radicals in gallium waste liquid, which is characterized in that the sampling amount is reduced from original 10mL to 5mL, the addition amount of concentrated hydrochloric acid is adjusted from 20mL to 5mL, and the pH value of the system is still maintained at 1-2 after the reaction is complete; the barium chloride solution keeps the original procedure dosage (20mL 10%), barium sulfate is ensured to be completely precipitated, and the steps of filtering, washing, firing and weighing are completed according to the original procedure after precipitation. Multiple parallel tests verify that the relative standard deviation of the method is smaller than or equal to 3%, and the production detection precision requirement is met; the method is compatible with the existing standard operation process of an enterprise, adapts to the characteristic of high concentration of gallium waste liquid sulfate radicals, does not need to add equipment or extra training, and can be directly applied to the ground.

The invention discloses a core-shell grinding material with a water-soluble shell, a polishing disc and a preparation method and application of the core-shell grinding material and the polishing disc, and belongs to the technical field of precision machining. The core-shell grinding material of the water-soluble shell is composed of a grinding material inner layer and a water-soluble inorganic salt outer layer, the core-shell grinding material and the grinding material inner layer are both granular, and the water-soluble inorganic salt outer layer comprises one or more of sodium chloride, sodium sulfate or barium chloride. The core-shell grinding material with the water-soluble shell exists in a polishing disc in a consolidation mode before polishing, in the workpiece polishing process, along with dropwise adding of the deionized water-based polishing solution, the shell of the core-shell grinding material is rapidly dissolved, and the grinding material exists in limited space pores generated by dissolution of the shell in a free mode. Due to the fact that the holes have a limiting effect on the grinding materials, waste of the grinding materials is reduced, damage of the grinding materials to the surface / subsurface of the workpiece is reduced, and finally the atomic-scale surface roughness is obtained.

The present application relates to the technical field of barium chloride production and preparation, and particularly relates to a purification method of electronic-grade barium chloride, comprising the following steps: S1, obtaining barium-containing filter residue by washing barite tailing barium residue with hydrochloric acid; S2, mixing the barium-containing filter residue and hydrochloric acid to perform leaching treatment, and obtaining barium chloride crude product; S3, dispersing the barium chloride crude product in water, adjusting the pH of the solution, adding a decontaminating agent, and performing ultrasonic-assisted segmented temperature control treatment, and obtaining barium chloride solution after filtration; S4, adding a crystal form control agent to the barium chloride solution, and performing programmed cooling crystallization under the action of a low-intensity direct current electric field to obtain electronic-grade barium chloride. The technical scheme of the present application realizes efficient conversion of difficult-to-treat barium residue and precise separation of impurities, overcomes technical problems such as low barium recovery rate, difficulty in removing impurities, and unstable product purity in traditional methods, and significantly improves the resource utilization rate of barium.

The invention relates to the technical field of metal halide luminescent materials, and discloses a preparation method of a cesium-lead-bromine-chlorine blue-light quantum dot colloid and a preparation method of a blue-light film. The method comprises the following steps: dissolving cesium bromide and lead bromide in N, N-dimethylformamide, adding oleic acid and oleylamine to form a precursor solution, and injecting the precursor solution into a toluene anti-solvent to prepare CsPbBr3 quantum dot colloid; and then dropwise adding a toluene saturated solution of alkaline earth metal chloride (calcium chloride, strontium chloride, barium chloride or magnesium chloride) for post-treatment to realize ion exchange of Cl <-> and Br <-> and synergistic defect passivation, so that the emission peak is continuously adjustable in the range of 450-500 nm, the half-peak width is less than 30 nm, and the photoluminescence quantum yield is greater than 60%. And further mixing the quantum dot colloid with a polymethyl methacrylate toluene solution and forming a film to obtain a stable blue light quantum dot film which can be used for a backlight source or a display device.

The invention belongs to the field of rare earth afterglow luminescent materials. The invention discloses a high-brightness divalent rare earth afterglow material. The molecular formula of the high-brightness divalent rare earth afterglow material is BaFCl: Gd / Li / Sm. The preparation method sequentially comprises the following steps: uniformly mixing and grinding barium fluoride, barium chloride, gadolinium chloride, samarium chloride and lithium chloride in proportion, carrying out high-temperature reaction in a tubular furnace, and carrying out heat preservation in a drying oven to obtain a product. The product has the characteristics that the product has very strong afterglow performance under X-ray excitation, the afterglow luminescence brightness value can reach 4.53 cd m <-2 >, the afterglow duration is longer than 100 hours, and the product has a very good application prospect in the field of delayed X-ray imaging.

The application belongs to the technical field of material science and engineering, and discloses a preparation method of manganese and bismuth co-doped barium strontium titanate ceramic material with high dielectric property. The application adopts a liquid phase method to react titanium tetrachloride, barium chloride, strontium chloride, oxalic acid, manganese oxide and bismuth oxide to obtain uniform barium strontium titanate powder. Co-doping is selected in the aspect of doping, and the manganese and bismuth co-doped barium strontium titanate is the first case. The preparation method highlights that the particle size of the prepared barium strontium titanate powder is smaller and uniform without agglomeration, and the barium strontium titanate powder has the characteristics of high dielectric constant and low dielectric loss.

This invention discloses a sulfide solid electrolyte and its preparation method, belonging to the field of solid electrolyte technology. SA / HPMC nanofiber membranes are prepared using electrospinning combined with barium chloride solution crosslinking technology; amino-modified SA / HPMC nanofiber membranes are obtained by KH-550 modification; LLZNO composite sulfide powder is synthesized through mechanical ball milling and high-temperature sintering; then, it is dissolved with PEO in anhydrous acetonitrile, impregnated with an amino-modified carrier, and hot-pressed to obtain the sulfide solid electrolyte. The fiber membrane of this invention has good mechanical strength and structural stability. This optimized porous fiber structure can guide the uniform adhesion of sulfide powder and pre-build a framework for ion conduction. Ultimately, the sulfide solid electrolyte possesses high ionic conductivity, air stability, and room-temperature cycling performance.

This application discloses a nano-tetragonal barium titanate and its process-enhanced continuous preparation method, belonging to the field of barium titanate preparation technology. The process-enhanced continuous preparation method for nano-tetragonal barium titanate includes the following steps: preparing a circulating mother liquor, a titanium tetrachloride acid hydrolysate, a barium chloride solution, and an ammonia solution; adding the titanium tetrachloride acid hydrolysate dropwise to the barium chloride solution to obtain a titanium-barium mixture; passing the titanium-barium mixture, the circulating mother liquor, and the ammonia solution into a microdroplet process-enhanced device for mixing and reaction; after heat preservation and aging, and solid-liquid separation, obtaining a mixed precipitate and a first filtrate; dissolving the mixed precipitate in a solvent, filtering to obtain barium oxalate tetrahydrate and a second filtrate; calcining the barium oxalate tetrahydrate to obtain nano-sized tetragonal barium titanate powder. By employing a microdroplet process-enhanced method, the titanium-barium mixture and the ammonia solution are dispersed into microdroplets smaller than 10 μm, enhancing the degree of material mixing, improving the mass transfer rate, and obtaining nano-barium titanate with small particle size and high purity.

The invention provides a preparation method of superfine barium sulfate, which comprises the following steps: at room temperature, weighing a proper amount of industrial-grade barium chloride and a proper amount of industrial-grade sodium sulfate solid, adding water to prepare feed liquid with equal molar concentration, filtering impurities, and respectively filling the feed liquid into storage tanks; adjusting the flow rate of the diaphragm metering pump to 2.25-500L / h, then adjusting the two feed liquids to the same stable flow rate, so that the two feed liquids flow out of the storage tank at a set flow rate, enabling the two feed liquids flowing out of the storage tank to simultaneously enter a spherical exhaust pipe, carrying out rapid precipitation reaction to generate an emulsion containing superfine barium sulfate particles, enabling the emulsion to enter a product storage tank, and placing the emulsion in the product storage tank, and finally, centrifugally filtering the emulsion, washing with water, and centrifugally filtering again to obtain a superfine barium sulfate filter cake, thereby finishing the preparation. The small-size effect is utilized, the barium chloride feed liquid and the sodium sulfate feed liquid are rapidly and fully mixed in the spherical exhaust pipe, mixing and mass transfer between fluids are enhanced, and industrial preparation of superfine barium sulfate is facilitated.

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 rare earth extraction, in particular to a rare earth extraction separation process method which comprises the following steps: treating raw bastnaesite to obtain activated mineral powder, performing alkali pressure boiling oxidation, roasting transformation and optimal dissolution leaching on the activated mineral powder to obtain a purified solution, removing sulfate radicals by barium chloride, removing lead by sodium sulfide and adjusting pH to obtain a rare earth chloride solution with low impurity content; performing multi-stage extraction on the rare earth chloride solution to obtain a neodymium chloride solution, a praseodymium neodymium chloride solution and a lanthanum cerium chloride solution, and performing oxalic acid precipitation and calcination to obtain a rare earth oxide product. According to the method disclosed by the invention, the processes of fine pretreatment, multi-stage differential extraction and purification are adopted, so that efficient separation of lanthanum cerium, praseodymium neodymium and neodymium in bastnaesite is realized, and the product purity is improved.

The application discloses a method for recycling valuable rare earth in lead-barium slag, and the method for recycling valuable rare earth in lead slag comprises the following steps: A, slurry of the lead slag is prepared by using water, the slurry water is heated, and then sulfuric acid is added for acid dissolution; B, the slurry water is cooled and filtered, the filter residue is temporarily stored in a warehouse, the filter liquor is heated, then barium chloride is added and stirred to precipitate, then the mixture is cooled and filtered, the filter residue is temporarily stored in a warehouse, and the filter liquor is a rare earth chloride solution; the method for recycling valuable rare earth from barium slag comprises the following steps: (1), the acid washing solution is mixed with the barium slag, the reaction system is heated, and then the mixture is washed and left to stand; (2), the reaction system is filtered, the filter residue is temporarily stored in a warehouse, and the filter liquor is a rare earth chloride solution. According to the method, the recovery rate of the valuable rare earth can be increased to more than 95%, the barium slag reduction amount can be more than 15%, and the lead slag reduction amount can be more than 45%, so that the yield of the valuable rare earth is effectively improved, the storage amount of the lead-barium slag is reduced, and the industrial practicability is high.

The application discloses a preparation method of spherical nano-barium titanate coated nickel powder and belongs to the technical field of MLCC internal electrode materials. The method comprises the following steps: dispersing nano-nickel powder in water and performing ultrasonic treatment; adding titanium tetrachloride into the water, and then adding a nickel powder dispersion liquid; then adding a barium source, adjusting the pH to alkaline by using lye, stirring and reacting at 60-80 DEG C under normal pressure and in an air atmosphere, and separating and drying to obtain the product. The barium source is barium hydroxide, barium chloride or barium acetate. The application uses cheap titanium tetrachloride as a titanium source to synthesize the barium titanate coated nickel powder with a core-shell structure in an aqueous solution in one step, and the reaction condition is mild, and no organic solvent and inert atmosphere protection are needed, so that the process is simple and the cost is low. The obtained product has a continuous and dense coating layer, the oxidation starting temperature is above 385 DEG C, the volume shrinkage rate at 1200 DEG C is less than or equal to 9.1%, the oxidation resistance and sintering shrinkage matching property of the nickel powder are significantly improved, and the product is suitable for MLCC internal electrode materials.

The present invention relates to the technical field of cement-based materials, and particularly relates to an alkali-activated cementing material and a preparation method therefor. Provided is an alkali-activated cementing material, which comprises the following preparation raw materials in parts by mass: 50-70 parts of calcined coal gangue, 50-70 parts of mineral slag, 5-16 parts of steel fibers, 1-1.5 parts of barium chloride, 40-55 parts of a sodium silicate solution, 5-10 parts of sodium hydroxide and 15-25 parts of water, wherein the steel fibers are directionally arranged in the alkali-activated cementing material; and the composition of the sodium silicate solution comprises 27.58 wt% of SiO2, 8.75 wt% of Na2O and 63.67 wt% of H2O. The alkali-activated cementing material is low in cost and has excellent mechanical properties.

The invention discloses a sulfide solid electrolyte and a preparation method thereof, and belongs to the technical field of solid electrolytes.An SA / HPMC nanofiber membrane is prepared by adopting an electrostatic spinning and barium chloride solution crosslinking technology; modifying with KH-550 to obtain an amino modified SA / HPMC nanofiber membrane; lLZNO composite sulfide powder is synthesized through mechanical ball milling and a high-temperature sintering process; dissolving the sulfide solid electrolyte and PEO in anhydrous acetonitrile, dipping an amination carrier, and performing hot pressing treatment to obtain a sulfide solid electrolyte; the fiber membrane has good mechanical strength and structural stability, the optimized porous fiber structure can guide sulfide powder to be evenly attached, a framework is built for ion conduction in advance, and finally the sulfide solid electrolyte has high ion conductivity, air stability and normal-temperature cycle performance.

The invention discloses a method for removing sulfate radicals from high-sulfate-radical ionic rare earth concentrate. Belongs to the technical field of rare earth concentrate smelting separation. The method is characterized by comprising the following steps: (1) washing; (2) primary filter pressing; (3) acid dissolution; (4) crystallizing calcium sulfate; (5) secondary filter pressing; (6) adding barium chloride; (7) carrying out third filter pressing; (8) drying at low temperature to obtain dried acid soluble slag; according to the method for removing the sulfate radicals from the high-sulfate-radical ionic rare earth concentrate, materials and equipment are easy to obtain, the cost is low, and the utilization rate of intermediate products can be increased. The method is used for removing sulfate radicals from high-sulfate-radical ion type rare earth ore concentrate.