409 results about "Lead acetate" patented technology

The invention relates to a method for preparing a nano lead product by lead plaster of waste lead-acid storage batteries. The method comprises the following steps of: mixing the lead plaster, sodium acetate, acetic acid and H2O2 according to a ratio, diluting the mixture by de-ionized water, agitating and reacting the diluted mixture at 20-30 DEG C for 6-10 hours, carrying out solid-liquid separation on the mixture after the reaction, adjusting the pH (Potential of Hydrogen) of the mixture to 7.1-7.3, standing the mixture for 1-2 hours, and filtering the mixture to obtain a lead acetate crystal; calcining the lead acetate crystal at 250-350 DEG C for 2-3 hours to obtain nano PbO powder; and mixing the lead acetate crystal, a sulfur source and a surfactant according to a ratio, adding a liquid medium in the mixture, mixing the mixture and the liquid medium uniformly, placing the obtained mixture into a reaction kettle at 120-130 DEG C for 10-15 hours, naturally cooling the mixture to a room temperature, carrying out solid-liquid separation on the mixture, and washing black sediments by water and ethanol to obtain the nano PbS product. The method disclosed by the invention not only provides a raw material and a method for manufacturing the nano lead product, and is good for relieving environmental damages which are possibly caused by a large amount of waste lead-acid storage batteries and realizing high efficiency and low pollution of a lead resource recycling process.

The invention belongs to recovery treatment on lead plaster of a waste lead-acid storage battery. The method comprises the following steps of: mixing the lead plaster of the waste lead-acid storage battery with waste sulfuric acid in the waste lead-acid storage battery according to the design requirement and roasting; adding roasting sand in a stirring kettle; adding tap water to a water level line of the device and stirring the roasting sand; adding a proper amount of calcium acetate, acetic acid and nitric acid; starting a solution circulating system pump, leaching out the roasting sand and maintaining the concentration of lead acetate to be saturated; adding a proper amount of bone glue and beta-naphthol, electrolyzing immersion liquid, recovering the metallic lead at the cathode and recovering lead dioxide at the anode; press filtering residues to obtain lead-off slag and filtrate; and adding calcium carbonate in the filtrate and recycling. The device mainly comprises a leaching part, a press filtration part, a circulating part and an electrolysis part, and concretely includes eight key components of the stirring kettle, a press filter, an overflow port, an electrolysis direct current power supply, an electrolytic cell, a cathode titanium basket, a corrosion resistant pump and a heating element.

The invention provides a method for roughing and tailings-discarding of fine rutile ore by multi-stage floatation, relating to the technique for roughing and tailings-discarding of fine rutile ore by multi-stage floatation and belonging to the technical field of mineral processing engineering. The method of the invention comprises the following steps: firstly, conducting the reverse floatation of rutile by using sodium oleate as a collector according to the characteristics that aluminum sulfate can inhibit the rutile and activate silicate minerals in varying degrees, so as to effectively deslime in the process of reverse floatation; and then, conducting the forward floatation of rutile by using lead nitrate (or lead acetate) as an activator of rutile and using sodium alkyl hydroxamate and benzyl arsonic acid (or styryl phosphonic acid) as a combined collector according to the characteristic that gangue minerals can be inhibited on a combined basis under the synergistic action of sodium fluorosilicate, carboxymethylcellulose and the residual aluminum sulfate in the ore pulp, briefly, the method of the invention can realize the roughing and tailings-discarding of fine rutile by the multi-stage floatation comprising the following steps: firstly, conducting the reverse floatation by inhibiting the rutile; and then, conducting the forward floatation by activating the rutile. The method of the invention has the advantages that the enrichment ratio and recovery rate of rutile are high, the tailings of rutile ore can be discarded thoroughly and the mineral processing cost of rutile can be greatly reduced.

The present invention discloses a perovskite thin film as well as a preparation method and application thereof. The method comprises: taking lead acetate as a lead source and processing by a one-step solution method; and taking a mixed solution of the lead acetate and CH3NH3I as a precursor solution and coating the solution on a hole transporting layer to obtain the perovskite thin film. The obtained thin film can be used as the perovskite thin film which can be used in a perovskite solar battery. The lead acetate is used as a precursor of perovskite so that the flatness of a film surface is effectively improved and the compounding of carriers on an active layer interface is greatly reduced; and a solvent-resisting performance of materials is improved and the performance of the device is remarkably improved. The method also has the advantages of simple preparation process, low cost and good experiment repeatability and the like, and is suitable for large-scale industrial production.

The invention provides a preparation method of lead zirconate-titante ceramic fiber, which relates to a ceramic fiber. The fiber obtained with the diameter less than 30Mum and the length about 1cm has a single perovskite phase and comparatively high consistency and the invention can be a preparation method of lead zirconate-titante ceramic fiber of ceramic fiber for 1-3 piezoelectric composites. The preparation of lead zirconate-titante precursor solution is : lead acetate trihydrate is added into n-Butyl alcohol, complexing agent glacial acetic acid is added then; the mixture is heated, dissolved and cooled to obtain solution A; zirconium butoxide and titanium butoxide are poured into the n-Butyl alcohol in sequence to obtain the binary mixed solution of zirconium and titanium, and then acetyl acetone is added into the binary mixed solution and solution B is obtained after backflowing; the solution A and the solution B are mixed and the lead zirconate-titante precursor solution is obtained after backflowing. The preparation of lead zirconate-titante precursor sol is: the lead zirconate-titante precursor solution is steamed, concentrated and stirred, rod winding is carried out and the lead zirconate-titante precursor sol is obtained after concentration; lead zirconate-titante gel fiber is obtained through fiber drawing; after aging, the lead zirconate-titante gel fiber is dried and carried out by heat treatment.

The invention provides a method for preparing tetrabasic lead sulfate. The method comprises the following steps: S10. impurities are removed from a lead acetate stock solution, so as to obtain a lead acetate solution; S20. the lead acetate solution is mixed with an alkaline solution under a heated condition, and lead oxide is obtained after filtering; S30. the lead oxide is mixed with sulfuric acid, filtering is carried out after reaction, and ball milling is carried out after sintering to obtain the tetrabasic lead sulfate. The method provided by the invention has the advantages of simple and controllable processes, high product purity (above 99 percent), and uniform and controllable particle sizes; moreover, according to the method, the lead acetate serves as the initiator to prepare the high-purity tetrabasic lead sulfate, and multiple batches of measurements of the tetrabasic lead sulfate show that the contents of iron element and barium element, which are the impurities significantly affecting the battery performance, are below 20 ppm and below 2 ppm respectively.

The invention relates to the technical field of clean recycling of waste batteries and discloses a method for recycling lead oxide from lead plaster of a waste lead-acid storage battery. The method comprises the following steps that (1) pre-desalination is conducted, specifically, the lead plaster of the waste lead-acid storage battery is added with alkali liquor to be subjected to pre-desalination, so that lead acid, lead acetate, lead nitrate, lead perchlorate or lead carbonate in the lead plaster is removed; (2) dissolution is conducted, specifically, a complexing agent solution is added into the lead plaster subjected to pre-desalination, all PbO in the lead plaster reacts with a complexing agent to generate lead complex ions, and a lead-bearing solution and filter residues are obtained; (3) dissociation is conducted, specifically, the pH value of the lead-bearing solution is adjusted by adding a dissociation agent solution, so that the lead complex ions are dissociated, and the PbO and a mixed solution containing the complexing agent and a dissociation agent are obtained; and (4) separating is conducted, specifically, a lead oxide product is obtained after solid-liquid separation and washing. According to the method, the technological condition is mild, the technological process is environmentally friendly, the technological procedure is simple, energy consumption is small, the cost is low, the lead oxide recycling rate is high, the purity is high, and the method has very high industrial application value.

The invention relates to a flotation two-stage desiliconization method for high-silicon bauxite, which is a flotation desiliconization technology for bauxite and belongs to the technical field of mineral processing engineering. The method comprises the following steps of: coarsely grinding the bauxite into particles with certain fine granularity; under the condition of a certain ore pulp concentration, performing flotation first-stage desiliconization by using sodium carbonate as a pH regulator and a dispersing agent of the ore pulp, water glass and sodium hexametaphosphate as a combined inhibitor of gangue mineral, lead acetate as an activating agent of the bauxite, sodium oleate as a collector of the bauxite and pine oil as a foaming agent, wherein the base flow in a flotation groove is a section of silicon-containing tailings; allowing foam products to enter a grinding machine and grinding the foam products into particles with fine granularity; adding the medicaments sequentially and mixing pulp; performing flotation second-stage desiliconization, wherein the base flow in the flotation groove is a section of silicon-containing tailings; and selecting the foaming products for multiple times to form bauxite concentrate. The sectional desiliconization method for 'flotation first-stage desiliconization after coarse grinding and flotation second-stage desiliconization after regrinding rough concentrate' is utilized, so the influence of ore argillization phenomenon on desiliconization is greatly reduced, the flotation desiliconization effect on the high-silicon bauxite is obvious, the silicon dioxide content of the bauxite concentrate can be reduced greatly, the ratio of aluminum to silicon of the bauxite concentrate is increased, and the recovery rate is high.

The invention discloses an additive-assisted perovskite solar cell and a preparation method thereof, and the solar cell sequentially comprises a bottom layer substrate, a bottom electrode layer, a bottom charge collection layer, an active light absorption layer, a top layer charge collection layer and a top electrode layer from the bottom to the top; At least one of the bottom electrode layer and the top electrode layer is transparent. The active light absorption layer is an additive-assisted growth perovskite semiconductor material APbX3, wherein A is at least one of alkylamine, acid amidine and alkali family elements, and X is at least one of iodine, bromine and chlorine. According to the invention, the method adjusts the thin film shape and crystallinity of a perovskite active layer through adding a little additive to anhydrous lead acetate perovskite solution, and improves the transmission and collection of carriers. The method improves the positive and negative sweep difference of the perovskite solar cell, guarantees the steady-state output, and improves the efficiency and repeatability of the cell.

The testing assembly comprises the glass tube, the indicating material in the glass tube and the diffusion control film on two ends of the glass tube. The indication scale for measuring value constitutes the indication window. The testing assembly and the scale are fixed on the carrier with badge shape. The indicating material comprises main agent, the inter surface modifying addition and ceramics powder in 80-120 mesh. One or several of lead acetate, lead nitrate and silver nitrate constitute the main agent. The intersurface modifying addition is soluble barium salt. The weight of the main agent is 1%-10% of the weight of the admixture. The invention provides the features of powerless, high sensitivity, good accuracy, low cost and convenience.

The invention relates to a method for rapidly determining total cyanides in cyanide-containing ore pulp, belonging to methods for rapidly determining the total cyanides in the cyanide-containing ore pulp in a cyanidation technology of the gold industry. The method comprises the steps of pretreating ore pulp by using methyl alcohol, shaking well, then adding a copper sulfate solution and a sodium metabisulfite solution, adding a right amount of silver nitrate solution and lead acetate solution, adding ethylene diamine tetraacetic acid (EDTA) and a phosphoric acid solution, distilling in a distillation flask, flushing a distillate guide tube with a small amount of water, taking out a receiving flask, diluting distillate to a marked line with water, and determining the distillate by using a silver nitrate titration method or an isonicotinic acid-pyrazolone spectrophotometric method. The method has the advnatazges that a gap in the determination of the total cyanides in the ore pulp is filled; copper sulfate and sodium metabisulfite are selected as masking agents, so that the interference of thiocyanides and sulphides can be eliminated, and the monitoring for cyanides in a gold carbonitriding and leaching technology is accurately guided; used time is short, filtration is not needed, the influence of the ore pulp on adsorption of the cyanides is avoided, and the working efficiency is improved.

Process for the production of lead hydrate or monoxide of high purity, from materials and/or residues containing lead in the form of sulphates, monoxides and/or other compounds, such as the paste coming from exhaust acid batteries, comprising the following steps of desulphurisation of the material and/or residue containing lead sulphate in an aqueous suspension with a suitable carbonate or hydrate in order to get conversion of the lead sulphate into a carbonate or hydrate, calcination of this desulphurised material and/or residue in order to get impure lead monoxide, followed by cooling and grinding, leaching of the impure lead monoxide by an aqueous solution of acetic acid followed by filtering to separate a solid residue, consisting mainly of non converted lead sulphate, from a lead acetate solution, precipitation of the lead acetate in solution by means of an alkaline hydroxide or alkaline-earth hydroxide, able to obtain soluble acetates, in order to get a precipitate, depending on the precipitation temperature, in the form of either lead hydrate or lead monoxide, followed by filtering of the obtained precipitate, separating a solution, at least one washing cycle and subsequent separation of the washing liquid, drying and optional calcination of the filtered and washed precipitate to get high purity lead hydrate or monoxide depending on the drying temperature.

The invention relates to a method of improving perovskite solar cell efficiency by using ionic liquid additive, and belongs to the organic optoelectronic technology field. The method comprises steps that (1) preparation of precursor mixed solution: lead acetate and methylammonium iodide are dissolved in an N,N-dimethylformamide solution to form the mixed solution; and 1-Ethylpyridinium chloride ionic liquid is adopted as the additive to prepare the precursor mixed solution; (2) preparation of a perovskite thin film: the precursor mixed solution is used to form a film by adopting a spin-coating technology, and is disposed on a conductive glass substrate provided with PEDOT:PSS, and annealing is carried out on a heating stage to acquire the perovskite thin film; (3) deposition of an electronic transmission layer: by adopting a thermal evaporation deposition way or a solution spin-coating way, the electronic transmission is deposited on the perovskite thin film; (4) evaporation deposition of a counter electrode: evaporation deposition of a metal aluminum electrode is carried out by adopting a vacuum evaporation film. The method has advantages of mild and controllable condition, simple preparation, low costs, and applicability in large-scale commercialized production.

The present invention relates to the recovery of high purity litharge from spent lead acid battery paste at a low temperature which does not produce sulfur dioxide. In the process lead acetate is produced which is converted to pure litharge.

The invention discloses a method preparing hexagram PBS nanocrystal. The process is as follows: cetyltrimethylammonium bromide is added into deionized water, and stirred efficiently to dissolve completely in the water, and then the transparent solution is obtained; lead acetate and thiourea are added into the transparent solution, stirred uniformly, and then added to the hydrothermal reaction kettle; the solution which is in the hydrothermal reaction autoclave keeps the temperature in 80 DEG C to 160 DEG C about 6 to 24 hours; the reaction autoclave is opened until the temperature is reduced to the room temperature through the natural cooling; and the solution is washed by deionized water and absolute ethyl alcohol, centrifugally filtrated; the precipitate is dried, and then the final product is obtained. The invention has the advantages of easy preparation, low reaction temperature, less energy consumption and low cost. The invention is beneficial to industrial production.

The invention relates to a method for preparing high-purity lead acetate and nanometer lead powder, and particularly relates to a method for preparing high-purity lead acetate and nanometer lead powder from waste lead paste of a waste lead acid battery. The method comprises the following steps: carrying out solid-liquid separation after adding the waste lead paste to a solution with a desulfurizer to desulfurize, so as to obtain waste lead paste; adding an acetic acid solution and a solution as a reducing agent to the obtained desulfurized lead paste, so as to obtain a soluble acid solution containing lead; adding a glacial acetic acid to the obtained soluble acid solution containing lead to carry out recrystallization and purification, so as to obtain high-purity lead acetate trihydrate crystal and a glacial acetic acid solution; and putting the high-purity lead acetate crystal into a tube furnace or a muffle furnace to roast, so as to obtain the nanometer lead powder. The lead acetate and the nanometer lead powder are prepared according to the method disclosed by the invention; the method is simple in production flow, low in energy consumption, high in lead recovery rate, free of sulfur dioxide pollution, and relatively low in environmental pollution, and can achieve discharge free of pollutants, and the economic performance is superior to that of a lead powder preparation process of a traditional pyrogenic process or a general wet process.

The invention particularly relates to wine yeast capable of low-yielding hydrogen sulfide and ethyl carbamate as well as a screening method and application of the wine yeast. A strain of the wine yeast is classified and named as saccharomyces cerevisiae CECLFN524 and is preserved in China General Microbiological Culture Collection Center on November 5th, 2010, and the preservation number is CGMCC NO. 4299. The strain is separated and screened in a natural fermentation process of small seedless white grapes of Xinjiang Loulan wine plant of China. The screening method comprises the steps of: after separating and purifying the strain by virtue of a WL culture medium, feeding the strain into fermentation liquid, respectively carrying out primary screening and secondary screening on a strain capable of low-yielding hydrogen sulfide by virtue of a lead acetate test paper development method and a hydrogen sulfide detection tube method, simultaneously detecting the contents of hydrogen sulfide and ethyl carbamate in the fermentation liquid, and finally screening to obtain saccharomyces cerevisiae capable of low-yielding hydrogen sulfide and ethyl carbamate. The strain can be applied to the wine-making industries.

Production of shikimic acid and use of Chinese Star Anise oil residual waste are disclosed. The process is carried out by taking Chinese Star Anise or Chinese Star Anise leaf as raw materials, crushing, decoction extracting by water or agitating to fast extract, depositing by alcohol, removing impurities, de-coloring by active carbon or porous resin, treating by lead acetate or enriching resin while anion-exchanging, crystallizing and re-crystallizing to obtain various-purity shikimic acid. It's cheap and convenient and has colorful raw materials.

The present invention discloses a flexible perovskite solar energy cell blade coating preparation method. The method comprises the following steps: employing a blade coating method to prepare a cavity transmission layer, a perovskite layer and an electron transmission layer on a flexible conductive substrate. The method is simple in preparation technology, low in design requirement, and the blade coating method is employed to save the cost and realize green production to the greatest extent. Lead source is limited as lead acetate, the parameters such as temperature of blade coating solution, the temperature of the flexible conductive substrate or a composite substrate (the composite substrate of the flexible conductive substrate, the cavity transmission layer and/or the electron transmission layer) the blade coating speed and the blade height are regulated to effectively prepare high-quality flexible perovskite solar cell in the air; and moreover, the flexible substrate replaces a traditional glass substrate to realize flexibility of the perovskite solar cell, widen the application range of the perovskite solar cell and open the door of the perovskite solar cell moving towards to the marketization.

The invention provides a detection method for galacto-oligosaccharide based on biological enzyme technology, which belongs to the technical field of food engineering. According to the invention, at first, the method of removing proteins by using trichloroacetic acid and lead acetate is employed for pretreatment of an object to be detected, and membrane filtration is utilized to remove impurities so as to obtain a sample to be detected; then, sodium hydroxide and sodium acetate with different concentration are utilized for ion exchange and gradient elution; finally, a four-potential pulsed amperometric detector is used for detection. The invention is applicable to separation and detection of cow's milk containing galacto-oligosaccharide and a variety of galacto-oligosaccharide components in a galacto-oligosaccharide solution system; employment of ion chromatography, utilization of the methods of ion exchange and gradient elution for separation of galacto-oligosaccharide and cooperativedetection with the four-potential pulsed amperometric detector enable contamination and interference to an analytical column, the detector and the like caused by macro-molecular substances such as proteins, fat and emulsifiers which might exist in the sample to be eliminated, thereby allowing accurate and rapid detection to be achieved.

The invention belongs to the field of resource reuse, and relates to a high-valued reuse method for copper anode mud silver separating residues of circuit boards, especially relates to the preparation of barium plumbate powder by using copper anode mud silver separating residues of circuit boards as raw materials by means of coprecipitation. The method comprises the following steps: carbonating the copper anode mud silver separating residues of circuit boards through a sodium carbonate solution, filtering to obtain carbonation reaction residues and a post-carbonated-reaction solution; neutralizing the post-carbonated-reaction solution to neutral with sulfuric acid, evaporating and crystallizing the solution to recycle the sodium carbonate; dissolving the carbonated-reaction residue with an acetum and filtering the solution to obtain a deleaded residue and a lead acetate solution; adding barium acetate to the lead acetate solution, uniformly mixing and dropwise adding an oxalic acid solution; filtering the solution to obtain a barium plumbate ceramic powder precursor and a post-oxalic acid precipitation solution; roasting the barium plumbate ceramic powder precursor to obtain the barium plumbate ceramic powder. Compared with prior art, the method is characterized by no secondary pollution, and high-valued reuse of a lead secondary resource, and the method is suitable for industrial production.

Without need of additional instrument, the kit is capable of mensurating range of sulfur dioxide contained in article rapidly; and minimum limit of detection is 6.0mg/Kg. The disclosed kit includes reactor with zinc powder, reactor plug with slit, 7-8m test paper of hydrochloric acid and lead acetate, the standard color grade in brown series, and thin plastic plant. The method includes steps: adding the soak of specimen to be tested into reactor with 0.5-2.0g zinc powder being loaded; adding hydrochloric acid, placing cover, overhanging wetted test paper of lead acetate inside the reactor; after 3 min, comparison is carried out between color of the test paper and standard color grade; determining content range of sulfur dioxide. Features are: simple operation, quick and sensitive, and widely available to test in site.

The invention discloses an antiferroelectric film with adjustable working temperature zone and higher pyroelectric coefficient and a preparation method and application thereof. The antiferroelectric film (Pb,Nb)(Zr,Sn,Ti)O3 taken as the pyroelectric material is prepared by a sol gel method, the solute of precursor solution can be lead acetate, lanthanum acetate or niobium ethoxide, stannic acetate, zirconium isopropoxide and titanium isopropoxide, the solvent includes glacial acetic acid, ethylene glycol ethyl ether, acetylacetone and water, the final concentration of the precursor solution is controlled between 0.2-0.4 M, and the substrate comprises LaNiO3/Pt/Ti/SiO2/Si and Pt/Ti/SiO2/Si. The antiferroelectric film is high in thermally stimulated current and adjustable in temperature andcan be used for a pyroelectric infrared detector, a smart device and a system.

The invention discloses a rare earth chromate-free passivation liquid for coating treatment of a material and an application of the rare earth chromate-free passivation liquid. The passivation liquid comprises the following components: boric acid, hydrogen peroxide, tervalent cerate, phytic acid and water, wherein a molar ratio of the boric acid, to H2O2 to Ce<3+> to the phytic acid to water in the passivation liquid is (1-50):(24.5-245):(1.66-83.2):(0.62-62):(1722-17220). The passivation liquid is used for surface treatment of a galvanized metal plate. According to the galvanized salt mist resisting passivation liquid used for surface treatment of the galvanized metal plate, the galvanized metal plate has the salt mist resistance, and the corrosive resistance is further remarkably improved. The experiments show that the anti-corrosion time of the treated galvanized metal plate to a lead acetate solution is raised from average 31 seconds before passivation to 35-360 seconds, and the salt mist resisting time of the treated galvanized metal plate is raised from average 6 hours before passivation to 6-180 hours.

The invention relates to a determining method for lead contents in gold concentrate and lead concentrate and belongs to a determining method for lead contents in ore and concentrate. The determining method comprises the following steps of using nitric acid, bromine water and sulfuric acid to digest a sample, and using hydrobromic acid and dilute sulphuric acid to treat for removing the interference of elements such as arsenic, antimony, selenium and tin in the sample to lead determination; then adopting sulphuric acid and lead to form lead sulfate precipitation, and filtering and separating out other interference elements; transferring the precipitation and filter paper to an acetic acid-sodium acetate buffer solution, enabling a mixture to generate lead acetate and dissolving in the buffer solution; taking xylenol orange as an indicator, and using a Na2EDTA standard titration solution for titrating. The accuracy, the precision and the reproducibility of the method disclosed by the invention can completely reach the determination requirement of the lead contents; meanwhile, the method has the advantages of simplicity and convenience in operation and high efficiency, and has important significance for quality monitoring, metal balance and trade pricing.