50results about "Lead carbonates" patented technology

A method and apparatus to extract and sequester carbon dioxide (CO2) from a stream or volume of gas wherein said method and apparatus hydrates CO2, and reacts the resulting carbonic acid with carbonate. Suitable carbonates include, but are not limited to, carbonates of alkali metals and alkaline earth metals, preferably carbonates of calcium and magnesium. Waste products are metal cations and bicarbonate in solution or dehydrated metal salts, which when disposed of in a large body of water provide an effective way of sequestering CO2 from a gaseous environment.

There is provided a process for recovering high purity litharge PbO from spent lead acid battery paste at low temperatures and the further preparation of highly pure lead oxides and Pb(OH)2.

The invention discloses a method for pretreating incineration ash of a circuit board and recovering bromine, belongs to the field of comprehensive recovery of ash whole-wet valuable metal and particularly relates to a method for recovering valuable metal, enriching precious metal and recovering bromine salt in the pretreatment process of incineration ash of the circuit board. The method mainly comprises the steps: extracting mixed alkali; recovering copper by copper extraction and back extraction; carrying out neutralization and precipitation to separate lead and zinc; evaporating and crystallizing bromine; regenerating mixed alkali extracting liquor; removing zinc by acid pickling; evaporating and crystallizing zinc; carrying out zinc and copper removal on mixed alkali extracting residuesand the like. Compared with a traditional ash comprehensive process, the technology disclosed by the invention has the advantages that recovery of valuable metals such as copper, zinc and lead and enrichment of precious metal such as silver in the pretreatment process of the ash is realized to the maximum extent; meanwhile, the bromine salt is separated and recovered; the method has the characteristics of high recovery added value, no tail liquid drainage and the like.

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.

A method for recovering lead oxide from a pre-desalted lead paste, comprising the following steps: a. dissolving the pre-desalted lead plaster by using a complexing agent solution, and making all of PbO therein react with the complexing agent to generate lead complexing ions, obtaining a lead-containing solution and a filter residue; b. adding a precipitant to the lead-containing solution, and then the precipitant reacting with the lead complexing ions to generate a lead salt precipitate and the regenerated complexing agent; c. calcining the lead salt precipitate to obtain lead oxide and regenerate the precipitant. The final recovery rate of lead oxide of the method can reach 99% or more.

The invention discloses a method for preparing lead carbonate from lead oxide waste and belongs to the field of recycling waste containing lead oxide. The method comprises the following steps: (1) utilizing a sulfuric acid composite solution to convert lead oxide waste into a lead sulfate crude product; (2) dissolving the lead sulfate crude product in the step (1) by an X-Y conjugate solution to dissolve lead sulfate in the crude product and filtering to obtain lead sulfate filtrate and insoluble impurities; (3) adding carbon containing matter into the lead sulfate filtrate obtained in the step (2) and separating to obtain the lead carbonate. The method disclosed by the invention can be widely applied to varieties of sources such as waste lead-acid cell lead plaster, waste generated in lead-acid cell production and lead containing waste in a smelting process and has the advantages of high lead recovery rate, cyclic utilization of a mother solution and the like.

An acrylic-fiber finish for use in carbon-fiber production contributes to high tenacity of resultant carbon fiber. The acrylic-fiber finish for carbon-fiber production includes an epoxy-polyether-modified silicone and a surfactant. The weight ratios of the epoxy-polyether-modified silicone and the surfactant in the total of the non-volatile components of the finish respectively range from 1 to 95 wt % and from 5 to 50 wt %. The carbon fiber production method includes a fiber production process for producing an acrylic fiber for carbon-fiber production by applying the finish to an acrylic fiber which is a basic material for the acrylic fiber for carbon-fiber production; an oxidative stabilization process for converting the acrylic fiber produced in the fiber production process into oxidized fiber in an oxidative atmosphere at 200 to 300 deg.C.; and a carbonization process for carbonizing the oxidized fiber in an inert atmosphere at 300 to 2,000 deg.C.

The invention relates to a process for producing basic lead carbonate, which comprises the following steps: (1) soaking and neutralizing slag to obtain solution of sodium hydroxide, (2) leaching lead chloride slag and filtering, (3) alkali neutralization, filtering and washing, and (4) carbonate conversion, crystallization, filtering and washing. The process uses residual slag of fire refining bismuth as a raw material, optimizes smelting production technology of blast furnace smelting, electrolysis of lead-bismuth alloy, and fire refining to ensure that smelting slag of bismuth can be better treated and utilized, and saves resources. In the process of the invention, lead circulates in a closed system so as to reduce environmental pollution.

To provide a process for producing carbonate particles, particularly carbonate particles that are needle- or rod-shaped, which can efficiently and readily form carbonate particles which offer orientation birefringence without heating at approximately room temperature, and can control the particle size. In the process, a carbon dioxide gas from a carbonate source is released into the gas phase and the carbon dioxide gas is dissolved in a liquid containing a metal ion source to produce carbonate particles which have an aspect ratio of greater than 1, wherein the metal ion source contains at least one metal ion selected from the group consisting of Sr2+, Ca2+, Ba2+, Zn2+ and Pb2+. The carbonate particles are preferably needle- or rod-shaped, the metal ion source is a hydroxide of a metal such as Sr, the carbon dioxide gas is released in a closed vessel, and the liquid contains a solvent.

The invention discloses a method for refining lead and zinc from coarse zinc oxide recycled from steelmaking dust and belongs to the technical field of metal recycle. The method comprises the following steps that (1) the coarse zinc oxide is made into spherical particles, and the spherical particles are added into an oxidizing smelting furnace to be heated, oxidized and refined; (2) zinc and lead elements volatilize out of a furnace body in a gaseous form and become dust after meeting oxygen, and the dust containing the zinc and lead is collected through a container; (3) the dust is put into a hydrochloric acid solution to be stirred and dissolved, the zinc component exists in a zinc ion solution form, and the lead component exists in a lead chloride solid form; (4) a sodium carbonate solution is added into the zinc ion solution, zinc carbonate is generated, a sodium carbonate solution is added into the lead chloride, and lead carbonate is generated; and (5) washing and drying are conducted. According to the method, the process is simple, operation is convenient, the purity of PbCO3 and ZnCO3 which are finally obtained can reach 98% or above, the purity of PbO and ZnO reaches 99% or above, and the elementary substances Zn and Pb reach 99.9% or above.

The object of the present invention is to provide a carbonate crystal, which has oriented birefringence, is needle- or rod-like, and is able to negate the birefringence without sacrificing the light transmittance of a transparent polymeric resin when it exists in the transparent resin; a manufacturing method of the carbonate crystal; and a transparent optical resin composition comprising the carbonate resin. The carbonate crystal has an aspect ratio of two or greater, the average major axis length of 400 nm or shorter, and the variation coefficient expressed in Formula (1) below is 0.40 or less:1r×{1n-1∑i=1n(ri-r)2}12Formula(1)wherein r denotes an average major axis length, n denotes the number of particles used for the measurement of the major axis length, and n denotes the major axis length of the ith particle measured.

The invention provides a method for preparing high sodium carbonate type lead carbonate by utilizing lead-containing fly ash. The method comprises the following steps: dissolving the lead-containing fly ash in a sulfuric acid solution, stirring, filtering and then collecting filter residue; adopting a mixed solution of sodium chloride and calcium chloride for leaching the collected filter residue,thereby acquiring rough lead chloride; refining the acquired rough lead chloride, thereby acquiring high-purity refined lead chloride; converting by dissolving the acquired refined lead chloride intoa sodium carbonate solution, thereby acquiring sodium carbonate type lead carbonate; drying, thereby acquiring an end product of sodium carbonate type lead carbonate. Compared with the prior art, theinvention has the advantages that the lead-containing fly ash is used as the raw material for producing the high sodium carbonate type lead carbonate, the performance meets the chemical industry standard 'basic lead carbonate' HG / T 4835-2015, a reference is supplied for the recycling of lead-containing solid wastes, such as lead slag (ash), the comprehensive utilization of lead-containing fly ashresource is expanded and the additional value of the lead-containing fly ash resource is increased.

The invention provides a lead sulfate waste desulfurization device and a lead sulfate waste desulfurization process thereof. The device comprises a desulfurization tank, a conversion tank, a carbonization tank, filters, a pump, a liquid storage groove and conveying pipes, wherein the desulfurization tank is connected with a first filter through a conveying pipe, a solution obtained after solid-liquid separation is conveyed into the conversion tank through a conveying pipe, the conversion tank is connected with a second filter through a conveying pipe, a solution obtained after solid-liquid separation is conveyed into the carbonization tank, and the molten liquid in the carbonization tank is pumped into the liquid storage groove through a pump and is to be transferred into the desulfurization tank so as to be recycled. According to the invention, solutions in a desulfurization tank, a conversion tank and a carbonization tank are circularly arranged, so that the reaction efficiency is effectively improved while the conveying pipe of the tank body is blocked due to slurry precipitation or scaling in the tank body is effectively reduced; and a carbonizing agent and organic phenolic substances are regenerated and recycled, so that the desulfurization cost is greatly reduced, the environmental pollution is effectively reduced, the production efficiency is effectively improved, and the desulfurization purpose is thoroughly achieved.

To provide a process for producing carbonate particles, capable of efficient, easy formation of carbonate particles which have high crystallinity, less prone to agglomeration and offer orientation birefringence, particularly carbonate particles that are needle- or rod-shaped, and of controlling the particle size. In the process a metal ion source and a carbonate ion source are heated together in a liquid of 55° C. or higher for reaction to produce carbonate particles with an aspect ratio of greater than 1, wherein the metal ion source contains at least one metal ion selected from the group consisting of Sr2+, Ca2+, Ba2+, Zn2+ and Pb2+. The carbonate particles are preferably needle- or rod-shaped, pH of the liquid after heating reaction is preferably 8.20 or more, and in its X-ray diffraction spectrum the full-width at half maximum of the diffraction peak corresponding to (111) plane is preferably less than 0.8°.

Wet process of low environmental impact recovers the lead content of an electrode slime and / or of lead minerals in the valuable form of high purity-lead carbonates that are convertible to highly pure lead oxide by heat treatment in oven at relatively low temperature, perfectly suited for making active electrode pastes of new batteries or other uses. The process basically comprises the following steps: a) adding sulphuric acid to a different acid leach suspension of the starting impure material for converting all dissolved lead compounds to insoluble lead sulphate; b) separating the solid phase constituted by lead sulphate and undissolved impurities from the acid leach solution; c) selectively dissolving lead sulphate contained in said separated solid phase in an aqueous solution of a lead solubilizing compound comprising preferably sodium acetate; d) separating the solution containing dissolved lead sulphate from the solid phase residue including undissolved impurities; e) adding to the separated solution of lead sulphate a carbonate of the same cation of said dissolving compound for forming insoluble lead carbonate and / or and lead oxycarbonate and a dissolved sulphate of the same cation; f) separating the precipitated carbonate and / or oxycarbonate of lead from the dissolving solution now containing also sulphate of the cation of said solubilizing compound.

The invention provides a method for preparing a mixture of lead carbonate and silver carbonate with waste residue gained from lithopone production. The method comprises making the waste residue gained from the lithopone production react with carbonic acid, to obtain a mixture containing the lead carbonate, the silver carbonate and elemental sulfur; obtaining clarifying fine emulsion and an elemental sulfur filter cake, after coarse filtration of the mixture; obtaining the elemental sulfur product, after deep processing of the elemental sulfur filter cake; obtaining a filter cake containing the lead carbonate and the silver carbonate, and sodium chloride solution, after fine filtration of the obtained clarifying fine emulsion; obtaining a mixed product of the lead carbonate and the silver carbonate, after washing, drying and crashing the filter cake containing the lead carbonate and the silver carbonate; distilling the sodium chloride solution to sodium chloride saturated solution and cooling; and obtaining the sodium chloride product.

The invention relates to a preparation method of a lead carbonate combustion catalyst for a solid propellant, which comprises the main step of: directly performing a solvent heating reaction of lead zirconate titanate sol for realizing the sol-solvent heating synthesization of a lead carbonate powder body; firstly, configuring the lead zirconate titanate sol of a certain concentration according to chemical components; then, directly putting the sol into a line of a high-pressure reaction kettle; and performing the solvent heating reaction at high temperature of 120 DEG C to 240 DEG C and highpressure to obtain the lead carbonate powder body. The invention has the advantages of good product crystallization performance, stable quality, high purity, good granule dispersity of powder body, simple technological process, easy control, no pollution, low cost and easy scale production.

The invention is directed to a radical improvement of the specific electrochemical and corrosive characteristics of a lead-acid battery without a drastic change in the process of battery producing. The lead-carbon metal composite material contains from 0.1 to 10% by weight of carbon, lead is the remainder, while the structure of the material contains carbon allotropic modifications from graphene to graphite. The method for material synthesizing is characterized in that lead or its alloys are melted in a melt of alkaline and / or alkaline earth metal halides containing from 1 to 20 wt. % of metal carbides or non-metals with a particle size of 100 nm to 200 μm, or solid organic substances, for 1-5 hours at a temperature of 700-900° C.

The invention relates to a preparation method of lead oxide, and the method is characterized by comprising the following steps of: 1. desulfurizing waste lead plaster, and carrying out solid-liquid separation to obtain a lead carbonate-containing cured product; and 2, carrying out high-temperature smelting on the lead carbonate-containing cured product to obtain lead oxide and waste gas, inputtingthe waste gas into an ammonia water device to produce a sulfur removal agent containing ammonium carbonate, and using the sulfur removal agent containing ammonium carbonate to desulfurize the waste lead plaster in the step 1. The preparation method of lead oxide is simple in process, high in efficiency and low in cost.

An acrylic-fiber finish for use in carbon-fiber production contributes to high tenacity of resultant carbon fiber. The acrylic-fiber finish for carbon-fiber production includes an epoxy-polyether-modified silicone and a surfactant. The weight ratios of the epoxy-polyether-modified silicone and the surfactant in the total of the non-volatile components of the finish respectively range from 1 to 95 wt % and from 5 to 50 wt %. The carbon fiber production method includes a fiber production process for producing an acrylic fiber for carbon-fiber production by applying the finish to an acrylic fiber which is a basic material for the acrylic fiber for carbon-fiber production; an oxidative stabilization process for converting the acrylic fiber produced in the fiber production process into oxidized fiber in an oxidative atmosphere at 200 to 300 deg.C.; and a carbonization process for carbonizing the oxidized fiber in an inert atmosphere at 300 to 2,000 deg.C.

The invention relates to a method and a device for two-stage mechanical strengthening desulfurization of waste lead plaster. The method mainly comprises the steps of non-sulfur lead component removal, primary desulfurization, evaporative crystallization, secondary desulfurization, washing and the like. The invention also discloses a device special for the method. The core components of the device are a primary desulfurization reactor, a secondary desulfurization reactor, a slurry circulating part and a high-efficiency product collecting part. Compared with the prior art, the problems of incomplete product layer coating and reaction in the lead plaster desulfurization process are reduced, and the problems of long desulfurization reaction time, low solid-liquid ratio and the like in the lead plaster desulfurization process are solved. Meanwhile, the modules of graded grinding and desulfurization of lead plaster slurry, efficient collection of products, recycling of desulfurization liquid and the like are integrated, the desulfurization efficiency is further improved, and the desulfurization cost is reduced. The method has the characteristics of cleanness, high efficiency, remarkable energy conservation and emission reduction and the like.

Systems and methods for producing potassium sulfate. Such a method involves providing an industrial waste material that includes at least one metal sulfate or a metal product that has been reacted with sulfuric acid to produce metal sulfates, and then reacting the metal sulfate with potassium carbonate to produce a byproduct that contains potassium sulfate.