12 results about "Lead salt" patented technology

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 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 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.

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.

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.

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.

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 application relates to the technical field of electronic material preparation, and particularly discloses a lead-ruthenate preparation method based on acidithiobacillus ferrooxidans mediation. The application takes soluble lead salt and soluble ruthenium salt as raw materials, utilizes the biological metabolic characteristics of acidithiobacillus ferrooxidans, regulates the oxidation-reduction environment and ion adsorption-deposition behavior of the system, realizes the directional synthesis of a lead-ruthenate precursor under mild conditions, and obtains high-purity and high-crystallinity lead-ruthenate powder through subsequent calcination treatment. The method has the advantages of mild reaction conditions, high raw material utilization rate, controllable product purity, green environmental protection and the like, solves the technical problems of high energy consumption of a traditional high-temperature solid-phase method, easy product agglomeration, complex process of a sol-gel method and high cost, and the prepared lead-ruthenate powder has good application prospects in the fields of thick-film resistors, high-temperature electrode materials and the like.