32 results about "Lead salt" patented technology

The invention discloses a preparation method of a conductive material for ruthenium resistance paste. The method comprises the following steps: 1, adding a lead salt solution into a ruthenium salt solution at a constant temperature, and then adding ammonium chloride to obtain a mixed solution; 2, carrying out spray drying treatment on the mixed solution, and calcining and decomposing to obtain precursor powder; 3, mixing the precursor powder with zirconium oxide balls, adding deionized water and a dispersing agent, carrying out ball milling, washing, filtering and drying to obtain dispersed powder; and 4, calcining and decomposing the dispersed powder again, mixing the obtained powder with zirconium oxide balls, and carrying out ball milling to obtain lead ruthenate powder. According to the method, mixing and dispersing of ruthenium and lead on the nanoscale are achieved through atomization drying treatment, the dispersed sphere-like powder morphology is obtained, powder agglomeration in the calcination decomposition process is reduced, the dispersity and particle size distribution uniformity of the lead ruthenate powder are improved, the method is suitable for preparation of the resistance paste, the technology is simple, the yield is high, and the method is suitable for industrial production. The industrial production is easy.

The invention belongs to the technical field of medical chemical component detection, and discloses a method for determining lead salt in a sulfadiazine zinc raw material, which comprises the following steps: S1, measuring a lead single element standard solution, and diluting with a nitric acid solution to obtain a linear solution containing different concentrations of lead; s2, weighing a sample, and adding nitric acid for digestion and dissolution to obtain a sulfadiazine zinc test solution; s3, measuring the same amount of nitric acid in the step S2, and performing digestion and dissolution to obtain a sample blank solution; s4, respectively injecting the linear solutions in the step S1 into an atomic absorption spectrophotometer, and making standard koji according to a preset heating program; and S5, respectively injecting the sulfadiazine zinc test solution and the sample blank solution into an atomic absorption spectrophotometer, and determining the lead content in the sulfadiazine zinc according to a preset heating program. The problems that an existing method is low in sensitivity and cannot meet limit requirements are solved.

The invention provides a lead salt modified 5-aminotetrazolyl gas generating agent with low combustion temperature and high combustion rate and a preparation method thereof, the gas generating agent comprises 5-aminotetrazole, strontium nitrate and lead salt, and the mass ratio of the lead salt is 5-10%. According to the invention, the 5-aminotetrazolyl gas generating agent is modified, so that the temperature of the gas generating agent can be reduced, the burning speed can be improved, and the applicability of the gas generating agent as a solid propelling type fire extinguishing device is enhanced.

This invention relates to a method for preparing copper-modified lead apatite. The method includes: sequentially subjecting precursor materials to a first hydrothermal process and a second hydrothermal process, followed by calcination to obtain copper-modified lead apatite; the precursor materials include liquid-phase precursor materials or solid-phase precursor materials; the liquid-phase precursor material is obtained by mixing lead salt, copper salt, phosphorus source, pH adjuster, chelating agent, and solvent; the solid-phase precursor material is obtained by mixing copper compound and lead compound; the temperature of the first hydrothermal process is lower than the temperature of the second hydrothermal process. The preparation method provided by this invention, by treating rationally designed raw materials using a specific hydrothermal process, can obtain copper-modified lead apatite with extremely low impurity content, which is beneficial for broadening the application fields of copper-modified lead apatite and improving its performance.

The invention relates to the technical field of solar cells, in particular to a high-purity lead iodide synthesis method which comprises the following steps: S1, preparing a lead salt solution; s2, filtering to obtain a primary lead salt solution; s3, diluting the primary lead salt solution to 0.015-0.15 mol / L, carrying out activated carbon adsorption and ion exchange resin purification, carrying out reduced pressure evaporation, and washing to obtain a high-purity lead salt crystal; s4, dropwise adding the high-purity lead salt solution into the iodized salt solution for precipitation reaction, and filtering after aging; and S5, dispersing the precipitate in a first solvent, washing, and filtering to obtain the high-purity lead iodide. The invention relates to a high-purity lead iodide synthesis method, which comprises the following steps: applying a low-cost auxiliary solvent to a lead dissolution reaction, carrying out precipitation reaction on a lead salt solution, carrying out preliminary impurity removal treatment, carrying out resin adsorption and other combined processes, reducing the content of impurity elements in high-quality metal lead, and preparing high-purity lead iodide; the combined process is easy and convenient to operate, the used reagents are wide in source and low in cost, the final product is high in purity, operation conditions are mild, and the combined process is suitable for the requirement of large-scale process production.

The preparation method comprises the following steps: (1) adding a lead salt and diammonium hydrogen phosphate into deionized water, stirring at room temperature, dropwise adding ammonia water into the deionized water in the stirring process, continuously stirring to obtain a mixed solution, adding the mixed solution into a hydrothermal kettle for reaction at the hydrothermal temperature of 100-200 DEG C for 10-30 hours, and filtering to obtain a filtrate; carrying out solid-liquid separation on a white product after the reaction to obtain a solid matter, drying the solid matter at 50-60 DEG C, and then carrying out high-temperature calcination to obtain lead phosphate powder; and (2) vulcanizing the lead phosphate powder to prepare the infrared detection material based on vulcanized lead phosphate. The prepared infrared detection material based on sulfurized lead phosphate is used for an infrared detector. The synthesis method has the beneficial effects that 1, the synthesis method is simple and low in cost, the used solvent is environment-friendly and green, and the synthesis method is suitable for large-scale production; and 2, the vulcanized lead phosphate disclosed by the invention has an ultra-low band gap and has the feasibility of infrared detection.

This invention discloses a high-radiation-shielding and antibacterial plexiglass and its preparation method. The steps are as follows: methyl methacrylate, modified nano-tantalum oxide, organic lead salt, superdispersant, and antibacterial agent are added to a reaction vessel, heated and stirred to dissolve, and then an initiator is added. After high-temperature prepolymerization, low-temperature polymerization, and high-temperature post-treatment, the high-radiation-shielding and antibacterial plexiglass is obtained. Compared with the prior art, the high-radiation-shielding and antibacterial plexiglass prepared by this invention has high strength and good toughness. The plexiglass contains both tantalum and lead, and antibacterial materials are introduced to compensate for the defect of "weak absorption region of Pb", which has a good shielding effect against X-rays and strong antibacterial properties.

The invention discloses a Pb-CeO2 composite catalyst as well as a preparation method and application thereof. The method comprises the following steps: calcining cerium salt in air to obtain CeO2, and mixing the CeO2 with lead salt in a solvent in proportion, or directly mixing the cerium salt and the lead salt in the solvent in proportion, heating and stirring, drying, grinding and uniformly mixing, and calcining in oxygen to obtain the Pb-CeO2 composite catalyst. The preparation method is simple, large-scale production can be achieved, the Pb-CeO2 composite catalyst is used for electrochemical carbon dioxide reduction, the formic acid synthesis Faraday efficiency close to 100% can be obtained, and when the applied voltage is-1.2 V, the current density can reach about 1 A / cm < 2 >.

The present disclosure relates to methods by which lead from spent lead-acid batteries may be extracted, purified, and used in the construction of new lead-acid batteries. A method includes: (A) forming a mixture including a carboxylate source and a lead-bearing material; (B) generating a first lead salt precipitate in the mixture as the carboxylate source reacts with the lead-bearing material; (C) increasing the pH of the mixture to dissolve the first lead salt precipitate; (D) isolating a liquid component of the mixture from one or more insoluble components of the mixture; (E) decreasing the pH of the liquid component of the mixture to generate a second lead salt precipitate; and (F) isolating the second lead salt precipitate from the liquid component of the mixture. Thereafter, the isolated lead salt precipitate may be converted to leady oxide for use in the manufacture of new lead-acid batteries.

The invention discloses a method for obtaining high-purity perovskite single crystal powder from a low-purity raw material, and the method specifically comprises the following steps: 1, dissolving halogenated organic salt and lead salt in an organic solvent according to a molar ratio of 1: 1 to form a perovskite solution with the concentration of 0.8-1.2 M; step 2, heating the perovskite solution to form a thermoperovskite solution; 3, continuously heating and stirring the thermoperovskite solution, and dropwise adding a perovskite anti-solvent; 4, continuously heating until crystals are not separated out, and removing supernatant liquid; step 5, injecting excessive ethyl acetate solution to wash the powder, and repeating for 2-3 times; 6, the perovskite powder is dried in a vacuum drying box, perovskite crystal powder is obtained, and perovskite crystals are high in growth speed, high in yield and good in quality.

The invention belongs to the field of thermistors, and discloses PTCR (positive temperature coefficient) heating ceramic without NTC (negative temperature coefficient) effect before Curie temperature and a preparation method of the PTCR heating ceramic. The preparation method comprises the following steps: (1) preparing a main material containing a barium salt, a lead salt, a calcium salt and a titanium salt according to the stoichiometric ratio of cations in BaxPbyCazTiO3; then mixing the main material, a semiconducting agent and an AST auxiliary material, and carrying out wet ball milling to obtain powder slurry; wherein 0 lt; xlt; 1, 0lt; yt; Yt; 1, 0.05 < = z < = 0.10, 0.97 < = (x + y + z) lt; 1.08, and x + y + z is not equal to 1; and (2) adding an adhesive into the powder slurry, drying, sequentially granulating and tabletting, sintering in a sintering furnace to obtain a PTCR ceramic chip, and preparing an electrode on the ceramic chip to obtain the PTCR heating ceramic. Compared with a traditional AST system, the heating ceramic formula system has the advantages that no NTC effect exists below the Curie temperature Tc, the impact current is small, and the starting speed is high.

A method of manufacturing a lead salt thin film on a substrate by seeding a substrate with a lead salt solution (e.g., PbSe, PbS, or PbTe) to form a seeded substrate comprising lead salt seed crystals, and growing the lead salt thin film upon the substrate by exposing the seeded substrate to a chemical bath comprising the lead salt solution at a predetermined growth temperature. A lead salt thin film manufactured by the process. A photonic crystal microchip comprising the lead salt thin film. A gas sensing device comprising a diode laser, a mid-infrared photodetector, and the photonic crystal microchip. A method of detecting a hydrocarbon gas, comprising exposing a gas sample to the gas sensing device, and determining the content of hydrocarbon gases in the gas sample.

The invention relates to a method for recovering lead salt and a substrate in a waste perovskite device based on an oxidation pickling method. The method comprises the following steps: putting the waste perovskite device into a vacuum plasma cleaning machine for oxidation; preparing an organic weak acid solution with a set concentration; immersing the oxidized waste perovskite device in the organic weak acid solution for ultrasonic treatment; evaporating the obtained lead salt solution to obtain lead salt powder, adding a proper amount of formamidine salt and haloid acid, stirring for a period of time to obtain perovskite powder, and adding isopropanol and diethyl ether to wash and dry perovskite powder crystals to obtain perovskite powder crystals; cleaning the recovered substrate; and the recycled substrate and the perovskite powder are used for preparing the perovskite photovoltaic device again, so that safe, green and low-cost recycling is realized.

A method for recovering lead-containing waste, comprising: (a) dissolving the lead-containing waste in an aqueous solution of a first acid to form a solution of a first lead salt; (b) adding a second acid to the solution of the first lead salt to form a lead-poor solution and a precipitate of a second lead salt; and (c) converting the precipitate of the second lead salt into lead-containing oxide, wherein the solubility of the first lead salt in water is higher than that of the second lead salt. The method can be used to recover waste slurry of lead-acid batteries.

The invention discloses a flotation reagent and method for sulfur and arsenic mineral activating agent and tin concentrate reverse flotation desulfurization and dearsenification, and belongs to the technical field of mineral processing. The sulfur-arsenic mineral activating agent comprises thiosulfate, soluble lead salt and soluble copper salt, can activate arsenic-sulfur minerals such as arsenopyrite (FeAsS2), pyrite (FeS2) and pyrrhotite (Fe1-xS) in a high-selectivity mode, enhances the flotation performance of the arsenic-sulfur minerals, and is used in cooperation with a cassiterite inhibitor, a sulphide ore collecting agent and a foaming agent, so that the flotation efficiency of the arsenic-sulfur minerals is improved, and the flotation efficiency of the arsenic-sulfur minerals is improved. The method is particularly suitable for flotation removal of arsenic-sulfur minerals in the tin concentrate, the tin loss can be remarkably reduced while the tin concentrate desulfurization and dearsenification efficiency can be greatly improved, and the environmental protection pressure of subsequent smelting is effectively relieved.

The present invention discloses an application of an organic lead salt, a composition thereof and a preparation method thereof. The present invention provides a use of a compound I as a curing accelerator in the field of azide solid propellants. The curing accelerator of the present invention satisfies one or more of the following advantages: having excellent curing performance, maintaining good mechanical properties and combustion properties of the azide composite solid propellant.

The invention provides a tin-lead alloy electroplating solution for wafer level bump interconnection and an electroplating method, the electroplating solution comprises the following components: 10-50 g / L of tin salt, 5-20 g / L of lead salt, 80-180 g / L of free acid and 0.01-2 g of an additive, and the additive is selected from at least one of cinnamyl aldehyde, coumarin, vanillin, gelatin, polyethylene glycol (with the molecular weight of 2000) and alkylphenol ethoxylates. The electroplating liquid containing the components is used for electroplating a substrate with array through holes with the working electrode being 10-500 microns in diameter, and the substrate with a plating layer is obtained. According to the electroplating method, the phenomenon of local over-electroplating or under-electroplating is avoided in the electroplating process, and the problems of poor conductivity and low reliability of a plating layer are avoided.

This invention discloses a combined pyrometallurgical-hydrometallurgical cascade separation method for arsenic-containing sludge from copper smelting, relating to the field of solid waste treatment technology. The method first involves low-temperature roasting of the arsenic-containing sludge at 300-600℃ in a reducing atmosphere to achieve preferential volatilization and recovery of arsenic, while copper and rhenium are retained in the roasted sludge. Next, the roasted sludge is subjected to pressure oxidative leaching, with copper and rhenium entering the leachate, and sulfur being enriched and recovered as elemental. Subsequently, arsenic is precipitated as stable arsenic crystals through ternary coupling control of redox potential, pH, and temperature. After deep removal of residual arsenic using barium / lead salts, rhenium is extracted using a co-extraction system to prepare ammonium perrhenate. Finally, copper is recovered from the raffinate by displacement or electrodeposition. This method can efficiently separate arsenic, sulfur, copper, and rhenium, with a sulfur recovery rate ≥92%, arsenic resource recovery rate ≥99%, rhenium recovery rate ≥92%, copper recovery rate ≥95%, solid waste reduction ≥80%, and no secondary pollution. It is suitable for the resource-based treatment of arsenic-containing sludge from copper smelting.

This invention discloses a Pb-CeO2 composite catalyst, its preparation method, and its application. The method involves mixing CeO2 obtained by calcining cerium salt in air with lead salt in a solvent in a specific ratio, or directly mixing cerium salt and lead salt in a solvent in a specific ratio. After heating and stirring, the mixture is dried, ground, and ground until homogeneous, then calcined in oxygen to obtain the Pb-CeO2 composite catalyst. The preparation method of this invention is simple and can be mass-produced. The Pb-CeO2 composite catalyst, used for electrochemical carbon dioxide reduction, can achieve a formic acid synthesis Faradaic efficiency close to 100%, and at an applied voltage of -1.2 V, the current density can reach 1 A / cm². 2 about.

The invention relates to a preparation method of a platinum-lead alloy catalyst, which comprises the following specific steps: mixing soluble lead salt, a carrier material and a reducing agent in water according to a certain proportion, uniformly stirring, carrying out a reduction reaction at a certain temperature, and filtering, washing and drying to obtain a lead-containing carrier material after the reduction reaction is finished; then putting platinum metal salt, a lead-containing carrier material and a reducing solvent into a ball mill according to a certain proportion for mechanical ball milling, and after ball milling is finished, separating out feed liquid and grinding beads; adjusting the ground feed liquid to be alkaline, uniformly stirring and mixing, performing reflux reaction at a certain temperature, cooling to room temperature after the reaction is finished, adjusting the pH to be weakly acidic, standing, and washing and drying to obtain the platinum-lead alloy catalyst. The catalyst product provided by the invention has the advantages of high electrocatalytic activity, less noble metal consumption, long cycle service life, simple preparation conditions and the like, and solves the problems that the binding force between the carrier and platinum is poor and the carrier is easy to corrode.

The invention relates to an inorganic material in the form of porous particles, which has a high capacity to capture iodine in the gaseous state when brought into contact with such iodine and which, once saturated with iodine, can be transformed, by heat treatment, into a ceramic of the apatite family in which the iodine is confined. Each particle of this material comprises: 1) a lead vanadate or phosphovanadate of formula (1): Pb3-xXx(VO4)2-2 y(PO4)2 y (1) in which: x = 0 or x > 0 but ≤ 0.33; y = 0 or y > 0 but < 1; X = Ba2+, Ca2+, Sr2+ or Cd2+; and 2) metallic lead or a lead salt. The invention also relates to a process for preparing the material and to the uses of said material. Applications: conditioning and storage in a matrix of radioactive iodine present in gaseous effluents produced during the processing of spent nuclear fuels and, in particular, of iodine-129.

An inorganic material in a form of open-porosity particles, each of the particles comprising a lead vanadate or phosphovanadate of formula Pb3-xXx(VO4)2-2y(PO4)2y, wherein x=0 or x>0 but ≤0.33; y=0 or y>0 but <1; X=Ba2+, Ca2+, Sr2+ or Cd2+; and metallic lead or a lead salt. A method for preparing the material, a method for capturing iodine present in a gaseous effluent as well as a method for conditioning iodine present in a gaseous effluent in a form of an iodoapatite.

The invention discloses a method for prolonging the service life of a lead single flow battery, which is characterized in that an electrode is subjected to electrochemical deposition pretreatment before being used, and a layer of lead active material skeleton is actively deposited on the surface of the electrode, so that the consumption of free lead ions in a first cycle of the battery is reduced, and the service life is further prolonged. According to the method for prolonging the service life of the lead single-flow battery, the problem that the service life is affected due to formation of a first cycle deposition framework of the lead salt single-flow battery is solved, and the reduction amount of the lead ion concentration of the first charge-discharge cycle of the battery can be effectively reduced, so that the cycle life of the battery is prolonged.

The present invention discloses a preparation method of an environmentally friendly gold extraction agent. Cyanate, ferrocene and lead salt are placed in a sealed container and mixed evenly; the mixed materials are calcined; the materials are placed in the air and naturally cooled to room temperature; and then ground into powder to obtain the environmentally friendly gold extraction agent. The present invention can synthesize an environmentally friendly gold extraction agent with the same gold leaching effect as sodium cyanide only by using cyanate, ferrocene and lead salt; the synthesis raw materials are low in price, the synthesis process is simple and convenient, and the synthesized product has the advantages of high gold leaching rate, low toxicity and environmental friendliness, and strong applicability to various gold ores.

The invention relates to a perovskite thin film precursor solution prepared in air and a preparation method and application thereof. The additive comprises cesium iodide, methylamine ammonium iodide, methylamine ammonium iodide, a lead salt, a stannous salt and an auxiliary agent, the auxiliary agent is prepared from a phenylhydrazine derivative and propyl gallate; the molar ratio of the propyl gallate to the phenylhydrazine derivative is 1: (0.1-10); the concentration of the auxiliary agent is 1 to 9 mg / mL. The technical problem to be solved is how to provide a perovskite film precursor solution prepared in the air, which can be prepared in the air and is not easily oxidized by the air, so that a prepared battery has excellent photoelectric conversion efficiency.

The present invention relates to the field of waste lead paste recycling and utilization, and discloses a method for recovering lead from sulfur-containing lead paste. The method comprises the following steps: (1) contacting the sulfur-containing lead paste, chiral aminocarboxyl molecules, and an organic acid salt at a pH of 7-8.2, so that non-PbSO4 components and PbSO4 components are leached simultaneously to obtain a lead-containing filtrate and a leached residue; wherein the molar ratio of the non-PbSO4 components to the PbSO4 components in the material before contact is 0.5-10:1; and (2) subjecting the lead-containing filtrate to an aging reaction with a precipitant to obtain a lead salt precipitate and a regenerated filtrate. The method provided by the present invention can achieve direct and efficient leaching of all lead components in the sulfur-containing lead paste in a one-step process, with a high lead recovery rate.

The invention relates to a tubular leaching impurity removal method for lead-containing gold concentrate, which comprises the following steps of: preparing the lead-containing gold concentrate into a material rod, and then infiltrating lining filter cloth by utilizing a circularly flowing hot hydrochloric acid solution to dissolve impurities such as lead and iron in mineral aggregate, so that semi-continuous leaching of production is realized; the total recovery rate of gold and silver and the recovery rate of lead can be improved while the lead removal rate, the iron removal rate and the purity of the obtained lead salt are guaranteed. Moreover, compared with the prior art, the tubular leaching device disclosed by the invention is adopted for leaching and impurity removal treatment, so that heating treatment before leaching treatment and filtering treatment after leaching treatment can be cancelled, further production links can be reduced, the production time is saved, and the production efficiency is greatly improved; in addition, the tubular leaching device disclosed by the invention is relatively convenient to charge and discharge, so that the difficulty of treating the lead-containing gold concentrate is reduced.

This invention relates to a hydrogenation catalyst for levulinic acid, specifically a bimetallic lead-silver catalyst, its preparation method, and its application. The preparation method includes the following steps: S1: ultrasonic treatment of a substrate in distilled water; S2: using the substrate treated in step S1 as a working electrode, performing cathodic electrodeposition in an acidic electrolyte containing lead salt to obtain E-Pb@C; S3: placing the E-Pb@C obtained in step S2 in a solution containing silver salt to perform an in-situ exchange reaction to obtain the E-PbAg@C catalyst. Compared with the prior art, this invention solves the problem of poor performance caused by the difficulty in generating active species on Pb-based electrocatalysts in the prior art. The bimetallic lead-silver catalyst of this scheme is used for the electrocatalytic hydrogenation of levulinic acid, achieving both high space-time yield and high Faradaic efficiency at a relatively low reaction potential.

The invention relates to a stable preparation method of NTO basic lead salt, and belongs to the technical field of burning rate catalysts, solid propellants and energetic materials. According to the method, NTO and lead nitrate serve as reaction raw materials, the NTO basic lead salt is synthesized through a neutralization and double decomposition reaction'one-pot method ', in the process, the reaction condition is precisely controlled, excessive ammonia water is added, the strong alkaline environment is guaranteed, and therefore the NTO basic lead salt product with the excellent crystal form is stably prepared. According to the method, the NTO basic lead salt product is successfully synthesized, generation of needle-shaped crystal forms is avoided, and the obtained product has good physical and chemical stability, low mechanical sensitivity and excellent application performance such as dispersity and filling density. The method is simple and feasible in process, high in safety and suitable for industrial production. The NTO basic lead salt product prepared by the method is good in free-running property, narrow in particle size distribution range and high in yield, and has a good application prospect in the related technical fields of burning rate catalysts, solid propellants, energetic materials and the like.

The present disclosure relates to methods by which lead from spent lead-acid batteries may be extracted, purified, and used in the construction of new lead-acid batteries. A method includes: (A) forming a mixture including a carboxylate source and a lead-bearing material; (B) generating a first lead salt precipitate in the mixture as the carboxylate source reacts with the lead-bearing material; (C) increasing the pH of the mixture to dissolve the first lead salt precipitate; (D) isolating a liquid component of the mixture from one or more insoluble components of the mixture; (E) decreasing the pH of the liquid component of the mixture to generate a second lead salt precipitate; and (F) isolating the second lead salt precipitate from the liquid component of the mixture. Thereafter, the isolated lead salt precipitate may be converted to leady oxide for use in the manufacture of new lead-acid batteries.