1562 results about "Lead oxide" patented technology

Holey optical fibers (e.g. photonic fibers, random-hole fibers) are fabricated with quantum dots disposed in the holes. The quantum dots can provide light amplification and sensing functions, for example. When used for sensing, the dots will experience altered optical properties (e.g. altered fluorescence or absorption wavelength) in response to certain chemicals, biological elements, radiation, high energy particles, electrical or magnetic fields, or thermal/mechanical deformations. Since the dots are disposed in the holes, the dots interact with the evanescent field of core-confined light. Quantum dots can be damaged by high heat, and so typically cannot be embedded within conventional silica optical fibers. In the present invention, dots can be carried into the holes by a solvent at room temperature. The present invention also includes solid glass fibers made of low melting point materials (e.g. phosphate glass, lead oxide glass) with embedded quantum dots.

The invention discloses a waste lead recovering method for lead-acid storage batteries. The method comprises the following steps: fine stuff such as diachylon and the like are added in a reaction kettle with a stirring device; reducing agent (FeSO4) and dilute sulfuric acid are simultaneously added; stirring reaction is carried out at the temperature of 50-60 DEG C for 50-70 minutes so as to reduce lead dioxide into lead sulfate; the lead sulfate is added into the reaction kettle with the stirring device; water is simultaneously added into the reaction kettle for size mixing; then sodium carbonate is added; desulfuration is carried out at the temperature of 50-60 DEG C so as to obtain solid lead carbonate; the lead carbonate is put into a smelting furnace and then decomposed at the temperature of 320-350 DEG C so as to obtain lead oxide; and reducing agent (carbon) is added into the smelting furnace to reduce the lead oxide into metal lead at the temperature of 700-800 DEG C. The method recovers the lead by means of the combination of the wet and the dry processes, thereby avoiding the harm to the environment caused by lead dust, lead vapor, lead skim, sulfur dioxide gas, and the like by adopting fire smelting. The method has the advantages of high lead recovery rate, low energy consumption and no environment pollution.

A process for recovering lead oxides from the spent paste of exhausted lead acid batteries. The process provides heating the spent paste with an alkali hydroxide solution at elevated temperatures prior to calcinations. Calcination is at various temperatures so that either lead mono-oxide, lead dioxide or red lead is obtained as the principal product. There is also provided the use of the lead oxide to prepare the paste for positive and negative electrodes or other lead compounds.

The invention provides a method for producing lead oxide by recovering waste lead-acid batteries based on an atom economy way and belongs to the field of chemical industry for clearing and recovering waste lead-acid batteries. The method comprises the steps of: heating lead paste and lead powder of the lead-acid batteries, and then carrying out solid phase mixing reaction, sodium hydroxide alkaline desulfurization and sodium hydroxide leaching to directly obtain a lead-bearing alkaline solution and filter residue; and carrying out purification and cooling crystallization on the solution so as to obtain high-purity lead oxide and a by-product sodium sulfate so as to eliminate the defect that a large quantity of chemical raw materials are required to be consumed in a conventional synthesis process of the lead oxide so that the method is a clean and energy-saving new technology and has a large-scale industrial application prospect.

The beneficiation method for zinc oxide ore includes milling, lead oxide floating, 1-3 grade of fine grain roughing of the tailings after lead oxide floating, 1-3 times of beneficiation for each roughed concentrate, roughing the middlings of the last time and the middlings of the first beneficiation, and final precise floating to obtain the concentrate. The present invention solves the technological problem of floating muddy zinc oxide ore by means of first floating of small grains and then the large grains, and has high zinc oxide ore recovering rate, reduced zinc oxide content in the tailings, lowered floating agent consumption and effective utilization of muddy zinc oxide ore.A

The invention discloses an ultrafine lead oxide prepared by using a waste lead plaster and a preparation method thereof. The preparation method comprises the following steps of: carrying out desulphurization process by mixing the waste lead plaster with an aqueous solution containing a composite desulfurizer for reaction; carrying out filtration to remove the desulphurization filtering solution to obtain the desulfurated lead plaster (filter residue); carrying out a leaching and crystal transformation process by adding a citric acid solution and a reducing agent into the desulfurated lead plaster obtained in the process, and carrying out filtration, washing, and drying to obtain the lead citrate after the desulfurated lead plaster reacts with the citric acid solution; carrying out a roasting process by roasting the lead citrate to obtain the ultrafine lead oxide. According to the preparation method disclosed by the invention, the ultrafine lead oxide is prepared from the waste lead storage lead plaster; a two-step leaching process is adopted; the filtering solution is simple in ingredient and can be recycled; a side product is recycled from the desulphurization solution. The preparation method disclosed by the invention is low in energy consumption, simple in equipment, high in lead recycling rate, and high in ultrafine lead product quality, and has the characteristics of good resource recycling effect, environmentally-friendly and pollution-free production process, and capability of clean production.

An electrical storage device includes high surface area fibers (e.g., shaped fibers and/or microfibers) coated with carbon (graphite, expanded graphite, activated carbon, carbon black, carbon nanofibers, CNT, or graphite coated CNT), electrolyte, and/or electrode active material (e.g., lead oxide) in electrodes. The electrodes are used to form electrical storage devices such as electrochemical batteries, electrochemical double layer capacitors, and asymmetrical capacitors.

A method for recovering lead oxide by a waste lead-acid storage battery is disclosed. The waste lead-acid storage battery is crushed together with lead slime subsequent to acid cleaning, a grid plate and a filler comprising the lead slime are obtained by screening, the grid plate is fused-cast to an alloy ingot, the filler and the lead slime are ball-milled, and fine stuff is added with saturated oxalic acid solution for reaction at 25-65 DEG C and then for filtering and depositing; the deposition is then treated by excessive 30% nitric acid at the temperature of 40-45 DEG C for subsequent filtration and deposition, and the deposition is reacted with 4wt% sal volatile at the temperature of 25-65 DEG C for subsequent filtration and deposition; the deposition is added into recovered HNO3 to be dissolved at the temperature 40-45 DEG C until no bubble is generated, the filtered filtrate is added with 25% ammonia for reaction, filtration, washing and deposition to be neutral, and the lead oxide is obtained by drying and roasting. Recoverable nitramine and ammonium sulfate are recycled in all the filtrates in the technologies; thereby discharging no waste liquid. The utilization rate of raw material is 90.1-92.1%, the yield is 95.0-96.7%, and the content of PbO is 98.0-98.9%.

A battery paste is disclosed. One such paste consists essentially of at least one lead oxide (i.e., an uncalcined oxide of lead) and at least one lead oxide sulfate, sufficient water to moisten the paste, and from 0.02 percent to 15 percent based on the weight of the lead oxide plus the weight of the lead oxide sulfate, calculated as the lead oxide, of glass fibers having an average diameter not greater than 15 micron. Another paste consists essentially of at least one lead oxide and at least one lead oxide sulfate, sufficient water to moisten the paste, and from 1 percent to 15 percent based on the weight of the lead oxide plus the weight of the lead oxide sulfate, calculated as the lead oxide, of glass fibers of a specific composition that enables specific beneficial ions to diffuse into the paste during the life of the battery.A method for producing such a battery paste and a delivery system for adding the additives that are added into the paste is also disclosed. The method comprises charging a part of the water and a part of the special composition glass fibers desired in the paste to a mechanical mixer, mixing the water and fibers, adding the lead oxide or oxides desired in the paste to the mixer, mixing the water, glass fibers and lead oxide or oxides until essentially all of the free water in the mixer has been mixed with the lead oxide or oxides, adding the rest of the water required to moisten the paste to the desired consistency and the sulfuric acid required to form the lead oxide sulfate or sulfates, and mixing the paste.The delivery system is the charging to a paste batch of a glass fiber mat that has been impregnated with the other required additives in such a proportion that a certain size/weight of the mat provides all the additional ingredients.

The invention discloses a cold-resistant rubber cable sheath material and a preparation method. The material comprises chlorinated polyethylene, ethylene-propylene-diene monomer (EPDM) rubber, lead oxide, calcium carbonate, N-isopropyl benzene-N'-phenyl p-phenylenediamine serving as an anti-aging agent, antimonous oxide, magnesium oxide, paraffin hydrocarbon oil, chlorinated paraffin, paraffin, carbon black, settled white carbon black, talc powder, gamma-aminopropyl triethoxysilane serving as a surfactant, dicumyl peroxide serving as a vulcanizing agent and triallyl isocyanurate serving as a co-vulcanizing agent. The low temperature performance of the material is improved by blending the chlorinated polyethylene and the EPDM rubber, and meanwhile, the flame-retardant performance of the rubber sheath material is improved by synergy of the antimonous oxide serving as a flame retardant and the chlorinated paraffin; experiments show that the rubber sheath material can pass low-temperature embrittlement test of 40 DEG C below zero, has excellent low-temperature resistance, has the oxygen index of more than 32 and has good flame-retardant performance; and the preparation method is simple and strong in operability.

The invention discloses a lead regeneration method for recovering lead paste from a waste lead acid storage battery by a wet method, and belongs to the field of lead regeneration from the lead paste of the waste lead acid battery. The lead regeneration method comprises the following steps of: adding the lead paste into an acid liquor reaction kettle containing a catalyst to perform oxidation reduction reaction on lead and lead dioxide in the lead paste to obtain soluble lead salt solution; meanwhile, reacting lead oxide with acid to obtain lead salt; separating to obtain insoluble filter residue mainly containing soluble lead salt solution and lead sulfate; and electrolyzing the lead salt solution to obtain lead, oxygen and acidic electrolyte, wherein the electrolyte can be returned to a leaching process for recycling, and the filter residue A is treated by the conventional reselection process to obtain the lead sulfate and the filter residue D. According to the lead regeneration method, the production cost is reduced, and high comprehensive lead recovery rate is obtained.

The invention relates to a desulfuration and dearsenization agent, which comprises a carrier and active components; wherein, the carrier can be formed by a single carrier, or by two or more carriers, and the carrier accounts for 10-80wt% of the total weight of the desulfuration and dearsenization agent; the active components comprises 0.1-40wt% of lead oxide, 0.1-60wt% of magnetic Fe21.333O32 and0.1-40wt% of copper oxide. The invention further discloses a preparation method of the desulfuration and dearsenization agent. The desulfuration and dearsenization agent prepared by the invention has high sulfur capacity and arsenic capacity with desulfuration and dearsenization rate being higher than 99%.

The present invention discloses one kind of no-lead RE doped sealing glass powder with low smelting point for vacuum glass sealing and its preparation process. The no-lead sealing glass powder has P2O5, SnO and ZnO as basic glass oxides and mixed RE oxide of La, Yt and Nd added, with the weight ratio between the basic glass oxides and the mixed RE oxide being (30.0-381.5) to (0.12-19.0). The no-lead sealing glass powder of the present invention with doping mixed RE oxide has lowered glass smelting and sealing temperature, raised chemical stability and lowered thermal expansion coefficient of glass as well as lowered environmental pollution. It is used in sealing electronic device and element and vacuum glass.

A paste for negative plate of lead acid battery is disclosed that has a reduced paste density, yet provides a negative plate with substantially increased BET surface area and consequently the battery with enhanced performance. The disclosed paste comprises an activated carbon additive having a mesopore volume of greater than about 0.1 cm³/g and a mesopore size range of about 20 angstroms to about 320 angstroms as determined by DFT nitrogen adsorption isotherm. The cured negative plate made of the disclosed paste has a BET surface area of about 9 m²/g and 19 m²/g when the carbon loading level of the paste is about 1% and 2% weight, respectively relative to dry paste lead oxide. The battery including the negative plate made of the disclosed paste maintains the performance such as charge capacity and cycle life, despite containing less lead.

The invention discloses a method for recycling waste lead-acid cells to directly produce lead oxide, belonging to the wet-process metallurgical field of recycling lead from lead-containing materials and waste lead-acid cells. The method for recycling waste lead-acid cells to directly produce lead oxide comprises the following steps of: carrying out a reaction on diachylum, lead powder and sodium hydroxide solution in the presence of catalyst to obtain a mixed solution containing NaHPbO2, sodium sulfate and sodium hydroxide, and un-reacted lead powder and impurities, and separating the mixed solution; cooling and filtering the mixed solution to obtain PbO crystals, and an alkaline solution containing Na2SO4 and the residual NaHPbO2; adding the NaOH to the solution, re-cooling the mixture to separate out sodium sulfate solid and obtain the NaOH solution containing the residual NaHPbO2; and carrying out re-dissolving-filtering-re-crystallizing to the PbO in the NaOH solution with mass concentration of 15-50% to obtain the pure lead oxide solid. The lead recovery ratio is generally between 98.5% and 99.2%, and the purity of the lead oxide is as high as 99.99% or higher.

The invention discloses a method of recovering sodium sulfate from a lead-bearing desulfurized waste liquid. The method is characterized by comprising the following steps: after adding a complexing agent into the lead plaster-bearing desulfurized waste liquid, forming a lead carbonate precipitate of lead complex ions in the liquor by adopting carbon dioxide or sodium hydrogen carbonate, and then carrying out solid-liquid separation to obtain a sodium sulfate filtrate and the lead carbonate precipitate; adding anhydrous sodium sulfate and sodium hydroxide into the sodium sulfate filtrate obtained by separating lead carbonate, and cooling at low temperature to separate out sodium sulfate crystals; and returning the filtrate without the sodium sulfate crystals again for desulfurization of lead oxide-bearing wastes.

The invention discloses copper red glaze and a production method thereof, and a method for preparing a ceramic product therefrom. The copper red glaze is prepared from parent glaze, a coloring agent and a stabilizing agent, wherein the parent glaze is prepared from the following components in parts by weight: 26 to 32 parts of quartz, 24 to 30 parts of feldspar, 10 to 14 parts of limestone, 12 to16 parts of barium carbonate, 4 to 8 parts of clay, 0 to 4 parts of zinc oxide and 0 to 4 parts of sodium borate; the coloring agent is one or a mixture of a plurality of copper oxide, cuprous oxide and copper carbonate, and the adding amount of the coloring agent is 1 to 4 parts by weight; the stabilizing agent is one or a mixture of a plurality of stannic oxide, ferric oxide, lead oxide and silicon carbide, and the adding amount of the stabilizing agent is 3 to 6 parts by weight. According to the invention, the copper red glaze is bright crimson red, the ceramic product produced from the copper red glaze has high yield and low cost, and can be used for producing domestic ceramic and display art ceramic products.

The present invention describes a method of recycling lead from lead containing waste, the method comprising the steps of mixing the battery paste with aqueous citric acid solution so as to generate lead citrate; isolating lead citrate from the aqueous solution; and converting the lead citrate to lead and/or lead oxide.

The invention discloses a method for preparing superfine lead oxide by using electrode active materials of wasted lead acid batteries. According to the invention, the superfine powder disclosed herein can be directly used for producing new lead acid batteries by the prior art, lead acid batteries can be recycled, and the method is a production technology which accords with circular economy principles. The method can eliminate the pollution generated by the waste lead acid batteries at the source, has the characteristics of low production cost and high economic benefit, and is suitable for existing lead acid battery production enterprises to let practical and affordable lead acid batteries be used with persistence and reassurance.

The invention relates to a method for recovering lead in a waste lead-acid battery filler by using a wet process, which comprises the following steps of: taking and adding sodium hydroxide and xylitol into water, agitating and dissolving at a normal temperature to prepare mixed solution; adding obtained lead paste powder in the mixed solution, reacting for 1-5 hours and taking a filtered filtrate as an electrolyte; adopting a pure lead plate or a stainless steel plate as a cathode; and adopting the stainless steel plate as an anode and switching on direct current for electrolysis. The method has the beneficial effects that the method of directly leaching lead paste is adopted; the processes of desulfurization and reductive transformation are not required, so that the process flow is simplified; the sodium hydroxide and xylitol solution are adopted when the lead paste is leached and can form a compound with lead oxide to leach the lead in the lead paste to a utmost extent, so that the sulfur dioxide and various smoke and dust generated in the pyrometallurgical recovery process are avoided, and the straight yield of the lead is improved; and volatile smoke and dust or acid mist can not be generated, so that the defect that a silicon fluorine acid electrolyte pollutes the environment and is harmful to human health is overcome.