17 results about "Lead acetate" patented technology

The invention relates to a synthesis method of a perovskite microcrystalline material, and belongs to the field of perovskite materials. The invention provides a synthesis method of a perovskite microcrystalline material, which comprises the following steps: mixing alkali metal iodide salt, lead acetate trihydrate and formamidine acetate, and reacting under preset conditions to obtain the formamidine lead iodide perovskite microcrystalline material. According to the method, an acid-free system is adopted for synthesizing the formamidine lead iodide perovskite microcrystal material for the first time, hydroiodic acid which is indispensable and extremely high in danger coefficient in a traditional aqueous phase method is completely abandoned, alkali metal iodide salt is creatively adopted as a green iodine source, high-quality formamidine lead iodide perovskite microcrystals are successfully synthesized, the material performance is guaranteed, and meanwhile the yield of the formamidine lead iodide perovskite microcrystals is increased. The safety of the synthesis process is greatly improved; in addition, the solid salt with stable properties is adopted, so that the sensitivity of the whole synthesis process to air and humidity is reduced, and better repeatability and stability are achieved.

The invention discloses a perovskite nanocrystal with low lead loss and high fluorescence quantum efficiency and a preparation method thereof, which can effectively reduce environmental pollution caused by discharge of lead element, and the preparation method comprises the following steps: placing A2CO3 or A (CH3COOH), lead acetate and metal salt in a container, adding organic acid and a non-coordination solvent to construct a reaction environment, after high temperature dissolution, injecting a halogen reaction source, and after the reaction is completed, adding an organic acid and a non-coordination solvent to prepare a perovskite nanocrystal with low lead loss and high fluorescence quantum efficiency. Performing reaction to synthesize coarse nanocrystals, performing surface reconstruction by using a quaternary ammonium salt solution to promote separation and purification, and cleaning to obtain a clear and transparent quantum dot solution; on the basis of an original ternary synthesis method, nucleation growth of the nanocrystals is achieved by introducing non-toxic metal elements, efficient conversion from lead element feeding to a product is promoted, and therefore the strong emission characteristic and stability of the nanocrystals are guaranteed while lead source emission and environmental pollution in the synthesis process are reduced.

The invention discloses a preparation method and application of a high-stability hydrogen sulfide detection card, and the preparation method at least comprises the following steps: step I, dispersing dithizone in ethanol to obtain a dithizone solution; iI, dissolving lead acetate in water to obtain a lead acetate solution; iII, under the alkaline condition, mixing the dithizone solution obtained in the step I with the lead acetate solution obtained in the step II to obtain a dithizone-Pb complex; step IV, mixing the methanol solution containing tetrabutyl ammonium hydroxide, N, N-dimethylformamide, water and ethanol, and carrying out water bath reaction to obtain an alkaline silica gel solid carrier; v, dispersing the dithizone-Pb complex obtained in the step III into the alkaline silica gel solid carrier obtained in the step IV to obtain a dithizone-Pb complex solid carrier; and step VI, dispensing the dithizone-Pb complex solid carrier obtained in the step V on a thin film to obtain the hydrogen sulfide detection card. The detection card can be used for quantitative detection of hydrogen sulfide and drug sensitivity analysis of bacteria.

The application discloses a Pb (1‑x) Ln x (Zr 0.52 Ti 0.48 )O3-based piezoelectric thick film material and a preparation method thereof. The implementation scheme is as follows: lead oxide, zirconium dioxide, titanium dioxide and oxide of a lanthanide element are fired to form pre-fired powder; lead acetate trihydrate, tetrabutyl titanate, oxide of the lanthanide element and zirconium n-propyl alcohol or zirconium isopropyl alcohol are mixed into a precursor solution by a sol-gel method; the powder and the gel are mixed to form slurry, the slurry is spin-coated on a substrate, and after drying and pyrolysis treatment, annealing is performed in an air atmosphere or an ACB atmosphere compensation, so as to obtain Pb (1‑x) Ln x (Zr 0.52 Ti 0.48 )O3 piezoelectric thick film with a thickness greater than 10 microns. The application has the advantages of high crystallinity, good compactness, high breakdown field strength, high electrical comprehensive performance, simple process and good repeatability, and can be used in micro-electro-mechanical system (MEMS), micro-actuator, sensor and ultrasonic transducer.

The invention discloses a chemical reduction gold working solution without additionally adding KCN. The working solution does not contain potassium cyanide (KCN); the gold-potassium alloy is prepared from the following components in percentage by mass or volume: gold potassium cyanide; pure water; the complexing agent comprises 8% of anhydrous sodium acetate, 6% of sodium ethylene diamine tetracetate, 3% of sodium sulfate, 2% of glycine, 0.08% of formaldehyde, 0.0002% of lead acetate trihydrate and 80.918% of water; the stabilizer comprises 2% of ethylene diamine tetraacetic acid tetrasodium salt, 1% of potassium ferrocyanide and 97% of water; the reducing agent comprises 5% of glycine, 4% of phosphoric acid, 0.8% of formaldehyde and 90.2% of water; and a pH adjusting agent. The invention further discloses a chemical gold plating method. The working solution provided by the invention does not contain potassium cyanide (KCN), so that a non-toxic chemical plating solution is realized; and meanwhile, the consistency and high stripping degree of a gold-plated layer after gold plating can be ensured.

This invention belongs to the field of high-purity inorganic material preparation technology, and relates to a method for preparing ultra-high-purity lead fluoride from lead oxide based on supercritical complexation extraction. Using lead oxide as raw material, lead acetate is synthesized through acetylation, deep purification through SCC-CO2 supercritical complexation extraction, and fluorination precipitation to prepare 5N-grade ultra-high-purity lead fluoride. Lead acetate is a strongly polar ionic organic salt with high lattice energy, and it is almost insoluble and does not leak in the SCC-CO2 system. Cu, which is present as an associated component in the raw material... 2+ Fe 3+ Zn 2+ Cd 2+ Bi 3+ Impurity metal ions, under the action of a complexing agent, form weakly polar, fat-soluble metal complexes, which are then efficiently extracted by supercritical CO2 and continuously carried out of the system, achieving deep separation of lead acetate from impurities. The purified ultra-high purity lead acetate reacts with ultra-high purity hydrofluoric acid to directly produce 5N grade ultra-high purity lead fluoride with a purity ≥99.995%. This method is suitable for industrial production due to its simple process, environmental friendliness, high impurity removal depth, and stable preparation of ultra-high purity lead fluoride.

The present application relates to the technical field of gas detection, and particularly relates to a responsive aerogel and application thereof. The responsive aerogel is prepared according to the following steps: metal organic framework material is mixed and dissolved with lead acetate to obtain an adsorption and response integrated probe; silk fibroin, polyethylene glycol diacrylate and the adsorption and response integrated probe are mixed, and a light curing reaction is carried out under the action of a photo-crosslinking agent, and the responsive aerogel is obtained. The double-mesh aerogel base generated by the reaction of silk fibroin and polyethylene glycol diacrylate can adsorb water molecules in different humidity environments to cause the base to be wetted, and provide a saturated micro-water environment for the colorimetric reaction on the surface of the pore wall, thereby effectively reducing the interference of environmental humidity on the response. The quantitative method established by using the responsive aerogel can be used for high-sensitivity quantitative detection of hydrogen sulfide in livestock and poultry farms.

The invention discloses a thallium removal method for a zinc hydrometallurgy system, which comprises the following steps: 1) in a neutral leaching supernatant purification process, adding potassium permanganate and ferrous sulfate in a first purification stage of a liquid purification process, and reacting for 1-2 hours; 2) adding zinc powder into the solution, adding activated carbon, and reacting for 1-2 hours; 3) adding lead acetate, and reacting for 1-2 hours; and 4) carrying out solid-liquid separation through a plate filter press, and removing purified residues. A combined thallium removal mode is adopted, so that the thallium content of the purified solution is low, the requirement of electrolytic zinc can be met, and electrolytic'plate burning 'caused by thallium is avoided; according to the thallium removal method for the zinc hydrometallurgy system, additional reaction time does not need to be increased, the thallium removal method can be synchronously carried out with the original neutral leaching supernatant liquid purification process, the production period is not prolonged, additional equipment investment is not increased, the cost is low, and the effect is good.

The invention discloses a method for extracting lead from waste lead plaster by taking sulfide minerals as a reducing agent, and belongs to the field of hydrometallurgy. The method comprises the following steps: mixing, heating and stirring the waste lead plaster, sulfide minerals, ferric salt and a sulfuric acid solution, reducing and converting a lead-containing phase in the waste lead plaster into insoluble lead sulfate to obtain reducing slag, generating ferrous ions from the sulfide minerals under the action of a ferric salt catalyst, and reducing and converting lead dioxide in the waste lead plaster into lead sulfate; the reducing slag and an acetate solution are mixed, heated and stirred, lead sulfate is desulfurized and leached into soluble lead acetate, and a lead-containing leaching solution is obtained. Aiming at the waste lead plaster in the waste lead-acid storage battery, the low-cost sulfide mineral is used as a reducing agent, so that the process cost is reduced. By means of the two-step process of reduction conversion and desulfurization leaching, the additional impurity separation procedure is avoided, the extraction efficiency of lead in the waste lead plaster is 99% or above, the pure lead-containing leaching solution is obtained, and a new thought is provided for efficient recycling of the waste lead plaster.

This invention discloses a method for removing impurities from a palladium extraction pre-liquid, relating to the field of precious metal hydrometallurgy. The method includes: Step 1, Oxidation Pretreatment: The palladium extraction pre-liquid is heated and concentrated, then water is added, followed by the addition of a mixed acid oxidant, chlorine gas is passed through, and the liquid is boiled to remove the chlorine, then filtered to obtain pretreated solution 1; Step 2, Purification and Impurity Removal 1: Basic lead acetate solution is mixed with pretreated solution 1, and after solid-liquid separation, a purified palladium extraction pre-liquid 2 is obtained; Step 3, Purification and Impurity Removal 2: Thiourea reagent, ammonium oxalate reagent, and liquid alkali are added to palladium extraction pre-liquid 2, mixed, filtered, and the filtrate is used as purified palladium extraction pre-liquid 3; Step 4, High-Efficiency Extraction: Diisopentyl sulfide is washed with a washing solution, and the washed diisopentyl sulfide is used to extract palladium solution 3 to obtain a palladium solution. This method removes selenium and base metal impurities from the palladium extraction pre-liquid, achieving purification and impurity removal, ensuring the extraction efficiency of the solvent extraction process, and reducing reagent consumption and precious metal dispersion loss.

The present invention relates to the technical field of gas detection, and particularly relates to a responsive aerogel and the use thereof. The responsive aerogel is prepared according to the following steps: mixing and dissolving a metal organic framework material and lead acetate, so as to obtain an adsorption-response integrated probe; and mixing a silk fibroin, polyethylene glycol diacrylate and the adsorption-response integrated probe, and subjecting the mixture to a photocuring reaction under the action of a photo-crosslinking agent, so as to obtain the responsive aerogel. A double-grid aerogel substrate generated by the reaction of the silk fibroin and the polyethylene glycol diacrylate can adsorb water molecules in environments with different humidities to wet the substrate, such that a saturated microscopic water environment is provided for a colorimetric reaction on the surface of a pore wall, thereby effectively relieving the interference of environmental humidity on the response. A quantitative method established by using the responsive aerogel can be used for high-sensitivity quantitative detection of hydrogen sulfide in livestock and poultry farms.

This invention relates to the field of mineral flotation separation technology, specifically to a method for desilication of high-silica bauxite by reverse flotation. The invention uses high-silica bauxite as the target material. The raw ore is crushed, ground, and slurry-adjusted to obtain a pulp to be processed. The pH of the pulp is adjusted to 5.0-9.0 using sodium hydroxide or hydrochloric acid. The reagents used in reverse flotation include a boehmite inhibitor, an activator, and an anionic collector. The inhibitor is selected from one or more mixtures of water glass, tannic acid, sodium pyrophosphate, and polyacrylamide. The activator is selected from one of copper sulfate, lead acetate, and aluminum chloride. The anionic collector is selected from one of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and sodium dodecyl sulfonate. This invention improves the selectivity of separating boehmite and kaolinite, resulting in good flotation separation, a high aluminum-silicon ratio in the bauxite concentrate, and a high alumina recovery rate. It also significantly improves the problems of large foam volume, strong viscosity, and difficulty in defoaming during the flotation process.

The application discloses a preparation method of hollow rod-shaped calcium carbonate for filling styrene-butadiene rubber, and comprises the following steps: S1: calcining limestone to obtain quicklime, and performing a digestion reaction on the quicklime and water to obtain Ca(OH)2, and then preparing Ca(OH)2 suspension; S2: adding a crystal form control agent into the Ca(OH)2 suspension, and performing a carbonation reaction on the Ca(OH)2 suspension by introducing a mixed gas of CO2, and stopping the introduction of CO2 when the pH of the reaction suspension is less than or equal to 7; S3: adding an appropriate amount of oxalic acid solution into the suspension; S4: adding an appropriate amount of glacial acetic acid solution into the suspension; S5: performing pressure filtration on the suspension, washing the suspension, performing pressure filtration again, and preparing the suspension again; S6: adding an appropriate amount of lead acetate solution into the suspension; and S7: finally performing pressure filtration, drying at 500 DEG C, and sieving, so as to obtain the hollow rod-shaped calcium carbonate for filling the styrene-butadiene rubber. The hollow rod-shaped calcium carbonate prepared by the application can replace the commonly used vulcanizing activator zinc oxide for rubber, and can enhance the tensile strength and elongation at break of the styrene-butadiene rubber.

The application belongs to the field of perovskite materials, and discloses high-purity lead bromide and a production method thereof. The production method of the high-purity lead bromide comprises the following steps: heating and stirring a lead acetate solution, adding a hydrobromic acid solution dropwise into the lead acetate solution, keeping the reaction under the condition of heating and stirring, and then sequentially cooling, aging, solid-liquid separation, washing and drying the obtained solid particles, so that the high-purity lead bromide is obtained. The production method provided by the application controls the reaction system in an acidic environment, which can accelerate the precipitation reaction rate of lead ions and bromine ions, promote the rapid generation of lead bromide crystals, adjust the system dissolution balance in the acidic environment, reduce the solubility product Ksp of lead bromide, reduce the loss of lead ions, ensure that the lead ions are fully converted into lead bromide precipitates, and further improve the yield and purity of the product.

The invention belongs to the field of perovskite materials, and discloses high-purity lead chloride and a production method thereof. The production method comprises the following steps: heating a lead acetate solution, dropwise adding a diluted hydrochloric acid solution into the lead acetate solution, then adding a concentrated hydrochloric acid solution to adjust the pH value to 0.5-1.0, carrying out a heat preservation reaction, then cooling to room temperature, and then sequentially carrying out solid-liquid separation, washing and drying to obtain solid particles, namely the high-purity lead chloride. By accurately regulating and controlling the core reaction condition, the problems of uneven granularity, irregular morphology and insufficient purity of the product in the prior art are effectively solved, and a multiple optimization effect is realized.

The invention discloses a method for efficiently recycling lead / arsenic combined pollution waste, and belongs to the technical field of non-ferrous metal hydrometallurgy. The method comprises the following steps: carrying out sulfuric acid leaching and solid-liquid separation on lead / arsenic-containing composite pollution wastes such as copper smelting smoke dust to obtain primary leaching residues containing lead, gold and silver and primary leaching liquid containing copper, zinc and arsenic; adding a regulator into the primary leaching solution, introducing SO2 gas after completing accurate pH regulation, monitoring and regulating electrode potential, temperature and time in real time, promoting arsenic in the solution to be separated out in the form of As2O3, and filtering to obtain secondary leaching solution containing copper and zinc and As2O3; the secondary leachate is subjected to replacement reaction, concentration and crystallization, and copper sponge and zinc sulfate products are recovered; pb in the primary leaching residues is leached to obtain a lead acetate solution, and efficient separation of lead and precious metal is achieved; according to the method, lead and arsenic in the copper smelting smoke dust can be efficiently recycled, subsequent green extraction of valuable metal is facilitated, the application range is wide, the arsenic content in wastewater can be greatly reduced, and environmental pollution is reduced.

The invention discloses a preparation method and application of two-dimensional multi-layer D-J type halide perovskite, and the two-dimensional multi-layer D-J type halide perovskite is prepared by using aminoethyl pyridine as an interlayer ligand, formamidine as perovskite ions, lead acetate trihydrate as a lead source, a hydrobromic acid aqueous solution as a bromine source and a reaction solvent through a one-step solution method. And carrying out suction filtration, cleaning and drying treatment to obtain a target product. And dissolving the target product in a mixed organic reagent, and obtaining a product with a proper size by using a ligand-assisted anti-solvent method. Different two-dimensional multilayer aromatic DJ halide perovskite can be obtained by selecting aminoethyl pyridine with substituent groups at different positions. The synthesis method is simple, does not need complex instruments, is short in reaction period and is beneficial to large-scale industrial application. The two-dimensional multilayer DJ type perovskite material prepared by the method can be used for preparing benzaldehyde through efficient photocatalytic activation of toluene C (sp3)-H bonds.