147results about "Lead halides" patented technology

The invention belongs to the technical field of preparation of semiconductor nanomaterials and discloses a single-size CsPbX3 perovskite nanocrystalline preparation method. The method includes: adding cesium carboxylate solution into N2 protected lead bromide solution to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline; scattering the single-size CsPbX3 perovskite nanocrystalline into normal hexane, and gradually adding lead chloride solution or lead iodide solution drop by drop to realize reaction for obtaining single-size CsPbBr3 perovskite nanocrystalline. The single-size CsPbX3 perovskite nanocrystalline preparation method has the advantages of simplicity in operation, easiness in size adjustment of products, component controllability and the like.

The invention relates to an overall treatment method of steel works sintering dust, which is characterized by comprising the following steps: carrying out stage treatment on electrically precipitated dust in a sintering head, conveying the electrically precipitated dust produced in a primary electric field directly to a sintering field (a stock yard or a material distribution room) for material application in case of sintering; mixing the electrically precipitated dust produced in a subsequent electric field and then carrying out stirring pulping, gradient magnetic separation, carbon selection by flotation and solid-liquid separation; when the solid-liquid separation is finished, using the obtained potassium solution for producing potassic fertilizer and extracting lead product from the obtained tailing slurry.The method of the invention has the advantages that different process routes are adopted to effectively recover and comprehensively utilize contained multiple valuable resources such as ferrum, carbon, potassium, lead and the like according to different contents of alkali metal such as potassium and sodium and heavy metal compounds such as lead, zinc and copper in different electric field precipitated dust in a sintering head electric precipitator.

The invention discloses a method for preparing a perovskite quantum dot at a room temperature. The luminescent quantum dot is MPbX3; in the formula, M is methyl amine (MA) or Cs, and X is any one of Cl, Br and I. According to the method disclosed by the invention, MX and PbX2 are dissolved in an organic solvent, and a certain amount of surfactant is added to form a precursor solution; an appropriate amount of the precursor solution is added into a poor solvent to form the perovskite quantum dot. By changing the quantity of the surfactant, the luminescence wavelength of the quantum dot can be adjusted, so that luminescence of fully-visible wave bands is realized. The method disclosed by the invention can be carried out at the normal temperature, protective gas is not needed, equipment is simple, and scale production is realized. According to the perovskite quantum dot prepared by the method, the fluorescent full width at half maximum is 20 to 43nm; the fluorescent quantum efficiency isnearly 90 percent, and the perovskite quantum dot can be applied to the fields of solar batteries, laser, photo-detectors, light-emitting diodes and the like.

The invention relates to the technical field of inorganic nanomaterial preparation, and in particular, relates to a method for preparing a two-dimensional inorganic flaky nanomaterial by mechanical force intercalation stripping of a three-dimensional inorganic layered crystal material. With mixed metal halide as an intercalation and stripping medium, the purified layered inorganic crystal materialand the intercalation and stripping medium are subjected to solid-phase high-energy ball milling treatment together, mixed powder after ball milling treatment is washed with water to remove the intercalation and stripping medium, the three-dimensional layered material can be highly efficiently made into the corresponding two-dimensional flaky material. The method has universality for stripping ofthe inorganic non-metallic layered crystal material, has the advantages of simple preparation process, short production cycle, and high yield of the two-dimensional material, does not affect a crystal structure of the two-dimensional material, and the intercalation and stripping medium can be reused without causing environmental pollution.

The invention relates to a completely-organic perovskite nano-sheet, and a preparation method and an application thereof. The preparation method comprises the following steps: adding a cesium precursor solution at room temperature, adding an organic solvent as a solvent and a surfactant, gradually rising the temperature to a preset temperature according to a certain heating rate in an inert gas atmosphere, rapidly carrying out ice water bath cooling, and repeating the centrifugation, re-dispersion and washing process to obtain the completely-inorganic CsPbBr3 perovskite nano-sheet which can be applied to blue LED devices. The reaction power is controlled by regulating the reaction temperature and the reaction time in order to obtain the completely-inorganic CsPbBr3 perovskite nano-sheet with the thickness being same to the thickness of 1 to 5 atom layers. The luminescence wavelength of the nano-sheet is in a range of 440-470 nm, and the nano-sheet can be applied to the blue LED devices, and has a good application prospect.

The invention relates to a fluorescent perovskite nanocrystal, and a preparation method and application thereof. The structure of the fluorescent perovskite nanocrystal is MOF-ABX3, wherein the mass ratio of MOF to ABX3 is (1-50):(0.1-5). A cationic halide salt solution used for perovskite synthesis is added into a metal organic framework dispersion liquid, and obtained perovskite nanocrystals areuniformly dispersed in metal organic framework crystals. Good fluorescence performance is achieved, and the method has universality. The synthesis method of the perovskite nanocrystal provided by theinvention can be directly used in applications of storage and protection of confidential information. Compared with the prior art, the operation process is simple and repeatable, the metal organic framework material and recorded information are very safe (absorption and fluorescence characteristics are avoided in a visible light range, and recognition by naked eyes is avoided), and the perovskitenanocrystal has a good fluorescence characteristic, so that the perovskite nanocrystal can be directly applied to the field of storage and protection of confidential information.

This invention is related to a method for the preparation of halide perovskite or perovskite-related materials on a substrate and to optoelectronic devices and photovoltaic cells comprising the perovskites prepared by the methods of this invention The method for the preparation of the perovskite includes a direct conversion of elemental metal or metal alloy to halide perovskite or perovskite-related materials.

The invention relates to a device and a method for continuous and controllable synthesis of uniform nanocrystalline at normal temperature. The method includes: injecting a prepared lead bromide precursor and Cs precursor into a capillary micro-fluidic chip micro-reactor (5) through a double-channel injection pump (3), mixing the substances uniformly, feeding the mixture into a connecting pipe (4),then putting the connecting pipe into an ultrasonic device (6), and carrying out ultrasonic continuous reaction, thus achieving continuous and controllable synthesis of cesium-lead-bromine perovskiteuniform nanocrystalline directly at normal temperature. The device and method provided by the invention realizes continuous synthesis of cubic-phase cesium-lead-bromine perovskite nanocrystalline with uniform size at normal temperature.

The invention provides a processing method for waste liquid from stripping tin scolding, which comprises the following steps: in the waste liquid from stripping tin scolding, adding a chlorate for reacting, then filtering the solution, washing the filter residue by a concentrated ammonia liquor for dissolving the silver chloride sediment, recovering silver by a washing lotion to acquire pure lead chloride, extracting a filtrate by an extractant to obtain ferric iron, wherein a strip liquor is a ferric trichloride solution which can be prepared to a tin stripping liquid, adding sulfate for depositing lead and silver, wherein the reacted filter residue is a mixed sediment of lead sulphate and silver sulfate, washing by the concentrated ammonia liquor, reducing to obtain a silver powder and lead sulphate; filtering and depositing lead and silver, depositing tin and iron, filtering to obtain the sediment and dissolving by alkali, and then electrolyzing to obtain tin, electrolyzing the residual filtrate to recovery copper, and depositing palladium in the solution to obtain the sediment for recovering palladium. The processing method has reasonable and useful process flow, and performs comprehensive recovery and utilization on valuable metal in the waste liquid from stripping tin scolding, the resource waste is reduced, and the environmental pollution is reduced.

The invention discloses a method for scale rapid preparation of a perovskite semiconductor material, wherein the method comprises the specific steps: dissolving or partially dissolving PbX2 and AX in a precursor solvent according to a certain proportion to obtain a precursor solution system; then adding a cosolvent, to obtain a clarified liquid; followed by, adding an anti solvent, and carrying out fast stirring reaction to generate an intermediate transition phase precipitate; and then carrying out drying treatment of the intermediate transition phase precipitate for 1 min-10 h at room temperature-100 DEG C, to obtain high-purity A4PbX6, wherein A is Cs<+>, Ru<+>, a methylamine cation, a formamidine cation or a mixed cation thereof, and X is a halogen ion. All the anti solvent, the precursor solvent and the co-solvent and the like used in the preparation process can be recovered and continue to use in next circulating production; circulation and no emissions are achieved in the whole preparation process, high yield and scale preparation of the product are achieved, the product has high fluorescence quantum yield, and the cost is low.

The invention relates to a preparation method of a small-size high-stability perovskite nanocrystalline Cs4PbBr6, and belongs to the technical field of preparation of semiconductor nanomaterials. Thepreparation method comprises the following steps: firstly injecting a caesium carboxylate solution into a lead bromide solution at the temperature of 140 DEG C to 200 DEG C under the protection of N2,reacting, synthesizing a perovskite nano-block CsPbBr3 with the size of 3.8 nm to 11.8 nm, purifying the perovskite nano-block CsPbBr3, dispersing the perovskite nano-block CsPbBr3 by using octadecene, raising the temperature to 25 DEG C to 120 DEG C, injecting an ammonium bromide solution, reacting for 3-8 minutes, then centrifuging and purifying to obtain a nanoparticle Cs4PbBr6. The preparation method has the characteristics of easy operation, simple steps and rapid reaction, the raw materials are easy to get, the prepared particles Cs4PbBr6 are uniform in size, regular in morphology and excellent in stability, and the particle keeps unchanged even after a stock solution is placed in the air for a month.

The invention belongs to the technical field of solid waste recycling and reusing and particularly relates to a bullion lead comprehensive treatment method. Through the bullion lead comprehensive treatment method provided by the invention, open-circuit of arsenic, lead, bismuth and antimony and high-efficiency enrichment of precious metals gold and silver are realized through twice vacuum distillation, and elementary arsenic, a lead-bismuth-antimony alloy, a silver alloy and a copper alloy can be obtained respectively; the lead-bismuth-antimony alloy, the silver alloy and the copper alloy aretreated through oxidizing refining, electrolytic refining and chlorination refining to obtain refined lead, refined bismuth, antimony trioxide and electrolytic silver and electrolytic silver, and goldenrichment is realized; the bullion lead comprehensive treatment method has the advantages of being high in metal direct yield, low in energy consumption, short in flow, simple in equipment and the like in the whole treatment process; and moreover, vacuum distillation belongs to the physical process; the alloys can be separated through the saturated vapor pressure difference of the metals withoutgeneration of waste water, waste gas and waste residues, and industrialization, automation and continuity of bullion lead treatment can be achieved easily.

The invention discloses a method for preparing a CsPbBrxI3-x nanorod. The method comprises the steps that a Cs2CO3-octadecene mixture is prepared, then excessive oleic acid is added into the mixture, the mixture is heated at the temperature of 120 DEG C under the nitrogen condition till Cs2CO3 and oleic acid completely react, and an oleic acid cesium solution is obtained; PbI2 and PbBr2 are taken and added into octadecene, the mixture is heated to 120 DEG C under the nitrogen condition, then a small amount of oleylamine and oleic acid is added, the temperature is raised to 135 DEG C, the mixture is heated till PbI2 and PbBr2 are dissolved, then the oleic acid cesium solution is added for reacting for 10 min to 80 min, the reaction product is subjected to an ice bath, centrifugation and methylbenzene purification, and the CsPbBrxI3-x nanorod is obtained. The molar ratio of cesium to lead is 1:1.8, and the molar ratio of iodine to bromine is 2:1. Compared with the prior art, the reaction steps are simplified, the reaction time is shortened, the temperature needed for the reaction is reduced, and the band gap and fluorescence emission of the CsPbBrxI3-x nanorod can be adjusted through the duration of the reaction time.

The invention discloses a method for recovering lead chloride from sintered ashes and preparing lead monoxide, which mainly comprises the following steps of: (A) adding the sintered ashes into industrial water while stirring to prepare into suspension slurry, and carrying out two-stage gradient magnetic concentration consisting of a weak magnetic concentration and strong magnetic concentration on the suspension slurry of the sintered ashes; (B) adding tail mud obtained from the magnetic concentration in to a NaCl solution, and recovering lead in the tail mud by adopting a chlorination extraction mode of hydrochloric acid and NaCl; and (C) dissolving PbCl2 crystal in a NaCl water solution, adding Na2CO3 into the solution for complete precipitation reaction, centrifugally filtering and washing the suspension solution, and drying and roasting the obtained solid to obtain a lead monoxide produce. The invention can not only completely remove corrosion and damages of elements of lead, copper and the like on a blast furnace when the sintered ashes are directly recycled during iron and steel melting, but also recover and comprehensively utilize the valuable elements.

The invention relates to the technical field of monodisperse powdery material preparation and provides a monodisperse high-purity lead iodide preparation method. The preparation method comprises the steps of preparing a lead salt solution and a soluble iodate solution and adjusting a pH as 0.5 to 7; performing precipitation reaction on the lead salt solution and the soluble iodate solution in a contact mode to obtain precipitate turbid liquid of lead iodide; ageing for 1 to 48 hours at room temperature and filtering, washing and drying to obtain a high-purity lead iodide powder product. The preparation method disclosed by the invention has the beneficial effects of simpleness in operation, high purity, stable and reliable quality and easiness in expanding preparation in large scale.

The invention discloses a method for preparing lead chloride and calcium sulfate from lead plasters of waste lead accumulators by a wet process. The lead plasters of the waste lead accumulators are taken as a raw material, and the method comprises the following steps of: leaching the lead plasters in an HCl-NaCl system; cooling the leach solution to separate out crystals; and separating, washing and drying. The method is characterized in that: a sulfur resource is recovered from cooling crystallization filtrate, and the cooling crystallization filtrate is in a closed cycle; the cooling crystallization filtrate is added with calcium chloride to form a calcium sulfate precipitate; the calcium sulfate precipitate is separated, washed and dried to form a calcium sulfate product; and the filtrate is used for preparing saturated NaCl solution which returns to the leaching process. Through the method, the lead chloride is obtained, and the industrial gypsum with the purity of over 97 percent is also obtained, so the sulfur resource is recycled, the cooling crystallization filtrate is circularly used, the lead recovery rate is over 96 percent after four times of circulation, and the waste of the lead resource and the lead pollution are avoided.

A perovskite quantum dot preparation method and a perovskite quantum dot solution are provided. The preparation method may include: providing a first solution including caesium oleate, a second solution including lead halide and a third solution including DDAB; adding the first solution, the second solution and the third solution into a non-polar alkyl solution at a preset proportion and stifling to obtain a perovskite quantum dot solution; the perovskite quantum dot solution may include caesium-lead-halogen of pure phase. In this way, the present disclosure can easily obtain the perovskite quantum dot solution including caesium-lead-halogen of pure phase.

The invention discloses a method for preparing lead chloride and zinc sulfate by using mid low grade zinc oxide ores and zinc oxide-lead oxide paragenetic ores, comprising the following steps: (1) crushing zinc ores and levigating, then mixing the levigated zinc ores with ammonium sulfate and roasting; (2) dissolving out clinkers obtained by roasting, carrying out iron precipitation and aluminium precipitation on the obtained filtrate, and further separating lead from the residues of zinc extraction; (3) boiling down a zinc sulfate solution obtained after iron precipitation and aluminium precipitation for electrolysis; and (4) leaching the residues of zinc extraction with an NaCl solution to obtain a filtrate, condensing the filtrate, cooling down and crystallizing out PbCl2 crystals, and returning the NaCl solution to the leaching process. According to the invention, circulation utilization is realized.

The invention discloses Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder and a preparation method of the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder. According tothe method, the zero-dimensional perovskite nanocrystalline scintillation powder required for radiation field detection can be realized. The method is a method for successfully synthesize the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder in batch in an organic solvent by utilize a solvothermal method and adjusting parameters such as reactant ratio, reaction temperature, time andthe like. Yellow-green samples synthesized at a certain temperature with organic solvent dimethyl sulfoxide as solvent and solutes CsBr and PbBr2 as solutes are washed, filtered and dried to obtain abright green finished product, namely, the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder. The preparation method provided by the invention is simple, low in cost, strong in controllability and capable of mass production; and the Cs4PbBr6 / CsPbBr3 perovskite prepared by the method has excellent quantum luminous efficiency, good stability and good thermal recovery characteristics.

The invention discloses a method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring. The method comprises the following steps: dissolving cesium bromide and lead bromide into dimethyl sulfoxide, then transferring to a centrifuge for centrifugation, standing after completion of the centrifugation, removing a supernatant, washing the dimethyl sulfoxide, filtering, and performing vacuum drying to obtain CsPbBr3 nanocrystal powder. The CsPbBr3 nanocrystal synthesized by the method provided by the invention has high fluorescence efficiency, can be unquenched for a long time at high temperature, has a wide application prospect; meanwhile, by the method provided by the invention, a technology is simple, any surface modifier and any toxic solvent are added, environment friendlinessis achieved, raw materials are cheap, operation is convenient, the efficiency is high, and industrial production is facilitated.

The invention relates to a preparation method of a lead iodide material with a controllable shape. The preparation method comprises the following steps: dissolving lead acetate trihydrate in an acidicaqueous solution to obtain a lead acetate aqueous solution, then dropwise adding a potassium iodide solution into the lead acetate aqueous solution, then transferring the mixed solution into a polytetrafluoroethylene reaction kettle to be sealed, reacting for 8 to 16 hours at 80 to 120 DEG C to obtain a lead iodide material. The process is simple, the reaction condition is mild, the operation isconvenient, by adjusting the content of acid, the particle size of a prepared PbI2 material can be adjusted in a range of 1 to 60 micrometers, the distribution range of the particle size can be effectively controlled, and the particle shape, i.e. a ratio of a surface {001} to a surface {101} can be effectively controlled. A micelle particle size of a PbI2 colloidal solution prepared from the PbI2material of different shapes and sizes is in a range of 100 to 1000 nm, and the distribution range of the micelle particle size is adjustable. The shape of a PbI2 film prepared by using a solution spin-coating method can be effectively controlled.

The invention relates to a method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent, belonging to the technical field of preparation technology of inorganic nanometer materials. Adopting cyclohexane as the solvent, the method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent uitlizes the precipitation reaction between hydrogen fluoride and lead ions and takes a surfactant as a soft template, to prepare the hollow lead fluoride nanometer spheres; wherein, the soft template is made from a plurality of surfactants, and the lead ions come from the soluble lead salts; the synthesized magnesium carbonate nanometer rods are provided with a diameter roughly between 30 and 100nm. Through the method for hot preparation of hollow lead fluoride nanometer spheres by micro-emulsion assisted solvent, the synthesized hollow lead fluoride nanometer spheres have the advantages of controllable size, low cost, simple preparation equipment, safe and easy operation, excellent performance of technique repeatability and stable products quality, and are suitable for the large-scale industrial production.

A process for chlorinating ore, slag, mill scale, scrap, dust and other resources containing recoverable metals from the groups 4-6, 8-12, and 14 in the periodic table. The process comprises: a) forming a liquid fused salt melt consisting essentially of aluminum chloride and at least one other metal chloride selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides, wherein the aluminum chloride content in the liquid salt melt exceeds 10% by weight; b) introducing the recoverable metal resources into said liquid salt melt: c) reacting the aluminum chloride as chlorine donor with said recoverable metal resource to form metal chlorides, which are dissolved in the salt melt; and d) recovering the formed metal chlorides from the salt melt.

The invention provides a method for preparing a perovskite quantum dot film through one-step crystallization, and belongs to the technical field of perovskite quantum dot materials. Adamantane methylamine and haloid acid are used as ligands, cesium halide, lead halide, the ligands and a solvent are mixed to obtain a precursor solution, the precursor solution is then deposited on a substrate, and the CsPbX3 perovskite quantum dot film is obtained after heating. The adamantane methylamine and the haloid acid are used as ligands, can rapidly cover perovskite, and are coordinated with CsPbX3 perovskite, and perovskite quantum dots are directly formed through a strong three-dimensional effect; meanwhile, the method is easy to operate and low in cost, the high-quality perovskite quantum dot filmwith the thickness larger than 500 nm can be directly obtained through one-step crystallization, and the obtained perovskite quantum dot film is high in repeatability, high in stability, good in fluorescence performance and uniform in grain distribution.

Provided are: a light-emitting layer for a perovskite light-emitting device; a method for manufacturing the same; and a perovskite light-emitting device using the same. The method of the present invention for manufacturing a light-emitting layer for an organic and inorganic hybrid perovskite light-emitting device comprises a step of forming a first nanoparticle thin film by coating, on a member for coating a light-emitting layer, a solution comprising organic and inorganic perovskite nanoparticles including an organic and inorganic perovskite nanocrystalline structure. Thereby, a nanoparticle light emitter has therein an organic and inorganic hybrid perovskite having a crystalline structure in which FCC and BCC are combined; forms a lamella structure in which an organic plane and an inorganic plane are alternatively stacked; and can show high color purity since excitons are confined to the inorganic plane. In addition, it is possible to improve the luminescence efficiency and luminance of a device by making perovskite as nanoparticles and then introducing the same into a light-emitting layer.

The invention relates to a lead fluoride crystal co-doped with ytterbium and alkaline and a preparation method thereof. The structural formula of the crystal is Ybx: My: PbF2, and the growth method of the crystal includes the following steps: (1) the values of x and y are determined; (2) the raw material is weighed in proportion, is fully and evenly mixed and is pressed into blocks, the blocks are put into an iraurite, platinum or plumbago crucible, PbF2 crystal is adopted as a seed crystal, growth atmosphere is high purity argon or CF4 gas, and melt growth method is adopted. Experiments show that the crystal of the invention has large absorption and emission section, long fluorescence life time and high thermal conduction.