99 results about "Inorganic lead compound" patented technology

The invention discloses methods and equipment for recovering waste diachylon by a wet method and manufacturing an electrode active substance material of a high performance lead acid battery by the wet method. The equipment comprises device required for a technology process by a chemical method, a chemical machinery method or an electrochemical machinery method. The active substance material provided by the invention can substantially raises an utilization rate of the active substance of the lead acid battery, specific energy of the battery and charging capability of the battery, simultaneously avoids generation and discharge of harmful substances such as lead gas, lead smoke, lead dust and SO2, raises a lead utilization rate in a production process, is beneficial for treating and recycling lead compounds and lead-containing liquid generated in a lead gas recovering process in a plate casting or welding technology, and reduces cost.

An outstandingly low environmental impact wet process recovers the lead content of an electrode slime and / or of lead minerals in the valuable form of high purity lead oxide or compound 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 treatments:a) suspending the impure lead containing material in an aqueous bath containing at least a lead oxide dissolving acid;b) reducing any insoluble lead dioxide to lead oxide by introducing in the suspension either hydrogen peroxide, a sulphite or sulphurous anhydride;c) converting all dissolved lead oxide to lead sulphate in the aqueous bath;d) obtaining a solution of lead sulphate obtained in an aqueous solution containing an acetate salt;e) precipitating and separating a purified lead compound in the form of either carbonate / oxycarbonate or of oxide / or hydroxide by adding to said acetate salt solution a carbonate salt or a hydroxide of the same cation of said acetate salt, respectively.Exemplary flow sheets according to several alternative embodiments and related processing plant diagrams are disclosed.

The invention relates to a novel low-smoke zero-halogen flame-retardant cable sheath material, which comprises the following components in percentage by weight: 15-35 percent of low-density polyethylene, 15-35 percent of ethylene-vinylacetate copolymer, 8-30 percent of modified nano magnesium hydroxide, 2-6 percent of microencapsulated red phosphorus, 8-19 percent of thermoplastic phenolic resin, 1.8-3 percent of dicumyl peroxide as a crosslinking agent, 0.1-0.25 percent of antioxidant 1010, 1-3.5 percent of lead sulfate tribasic as a lead compound and 0.1-1 percent of N-salicyl aminophthalimide as a copper inhibitor. According to the novel low-smoke zero-halogen flame-retardant cable sheath material, the consumption of the modified nano magnesium hydroxide is reduced by adding the thermoplastic phenolic resin and the microencapsulated red phosphorus on the basis of ensuring the performance of mechanical energy, and the purpose of synergically retarding flame is achieved. When the cable sheath material burns, the microencapsulated red phosphorus absorbs a great deal of water decomposed and released when the modified nano magnesium hydroxide burns, to generate phosphoric acid, metaphosphoric acid, polymetaphosphoric acid and the like which cover the surface of the thermoplastic phenolic resin with higher carbon content, so that the surface of the thermoplastic phenolic resin can be dehydrated and carbonized in an accelerating way to form a thick liquid film layer for isolating oxygen and heat from the inside sheath material, and thus burning can be weakened or interrupted, and the flame-retardant effect of the cable sheath material is enhanced; meanwhile, the novel low-smoke zero-halogen flame-retardant cable sheath material disclosed by the invention has the advantages of zero halogen, low smoke formation amount during burning and little pollution to environment.

An electrode and a DEL capacitor formed therewith. The electrode will typically be a polarizable electrode, and may be formed of an activated carbon material having a substantially zero ash percentage and a low percentage of transition metals. In constructing a DEL capacitor employing such an electrode, a non-polarizable electrode formed from a lead dioxide / lead sulfate compound is preferably also used. The DEL capacitor may utilize an acid-based electrolyte, such as an aqueous sulfuric acid electrolyte. Consequently, the present invention also includes a current collector that preferably comprises a base material formed from a lead or a lead compound and a protective coating material that is resistant to an acid-based electrolyte. Preferably, the protective coating material is formed from a polymer base and a conductive dope that may thereafter be applied to the current collector base material by a variety of methods.

An electrode and a DEL capacitor formed therewith. The electrode will typically be a polarizable electrode comprised of an activated carbon material having a substantially zero ash percentage and a low percentage of transition metals. In constructing a DEL capacitor employing the electrode of the present invention, a non-polarizable electrode consisting of a lead dioxide / lead sulfate compound is preferably also used. The DEL capacitor may utilize an acid-based electrolyte, such as an aqueous sulfuric acid electrolyte. Consequently, the present invention also includes a current collector that preferably comprises a base material consisting of lead or a lead compound and a protective coating material that is resistant to an acid-based electrolyte. Preferably, the protective coating material is formed from a polymer base and a conductive dope that may thereafter be applied to the current collector base material by a variety of methods.

An igniting agent composition substantially free of a lead compound, characterized in that it comprises a metal power and one or more selected from the group consisting of nitrate salt, basic nitrate salt, a metal oxide and a basic carbonate salt; and an igniter using the igniting agent composition. The igniting agent composition shows no delay in ignition time and no reduction in igniting capability, as compared to conventional lead-containing composition.

An all-wet process for reclaiming the lead content of impure electrode paste or slime from discarded lead batteries and / or lead minerals, in form of high purity lead compound, comprises a) suspending the impure lead containing material in a lead sulphate dissolving aqueous solution of a salt belonging to the group composed of the acetates of sodium, potassium and ammonium; b) adding to the suspension sulphuric acid in an amount sufficient to convert all lead oxides to lead sulphate soluble in the acetate salt solution and slowly adding to the suspension either hydrogen peroxide or a sulphite or bubbling sulphurous anhydride through it, in a measure adapted to reduce any lead dioxide to lead oxide converted eventually to soluble lead sulphate by the sulphuric acid; c) separating a limpid acetate salt solution containing dissolved lead sulphate from a solid phase residue including all undissolved compounds and impurities; d) adding to the separated solution of lead sulphate either carbonate or hydroxide of the same cation of the acetate salt of the lead sulphate dissolving solution for precipitating highly pure lead carbonate / oxycarbonate or lead oxide or hydroxide, respectively, while forming sulphate of the cation, soluble in the acetate salt solution; and e) separating the precipitated high purity lead compound from the acetate salt solution now containing also sulphate of the same cation of the acetate salt. The acetate salt solution containing also sulphate of the same cation of the acetate salt separated from the precipitated compound of lead is re-cycled to step a) and the content of sulphate of the same cation in the solution is maintained below saturation limit by continuously or periodically cooling at least a portion of the solution separated from the precipitated lead compound to cause selective crystallization of sulphate salt of the same cation of the acetate salt and removing it as a by-product. Optionally, the separated solid phase comprising insoluble compounds of lead and / or undissolved concretions of lead compounds is treated in hot concentrated hydroxide of the same cation of the selected acetate salt and converting these compounds of lead and / or undissolved concretions of lead compounds to soluble plumbites, and the separated lead containing alkaline liquor may be added to the limpid acetate solution for precipitating all reclaimable lead in form of high purity lead oxide or hydroxide.

The invention relates to a mirror back protective coating for a copper-free silver mirror. The protective coating comprises base coat and finishing coat, wherein both the base coat and the finishing coat comprise modified alkyd, acrylate resin, novolac epoxy resin and crosslinked resin. The novolac epoxy resin and the crosslinked resin can form a rigid netted dense structure after undergoing a high-temperature curing reaction, so that the corrosion resistance of the coat is greatly improved, long-term effective protection of a silver layer is realized, and the coat is endowed with appropriate rigidity and scratch resistance. The coating of the invention contains a great amount of radicals such as epoxy groups, ether bonds, hydroxide radicals and the like, thereby greatly increasing the adhesive force of the coat. The coating of the invention does not adopt anti-corrosion lead-containing compounds, thereby avoiding environment pollution. The coating of the invention can adopt a large-scale curtain-coating molding process, can realize quick drying, can be completely solidified after being roasted at the temperature of between 120 and 150 DEG C for 5 to 8 minutes, has excellent physical and chemical properties and contributes to large-scale industrial production.

The invention discloses a method for improving the quality of low-grade zinc oxide and removing fluorine, chlorine and arsenic in low-grade zinc oxide by reducing and roasting in a rotary kiln. The method comprises the steps of adding the low-grade zinc oxide into the rotary kiln, roasting the low-grade zinc oxide under high temperature and micro negative pressure condition in the kiln with 900-950 DEG C of kiln temperature and 550-650 DEG C of kiln tail temperature, controlling the rotation speed of the rotary kiln to be 1.5turns / min and controlling the roasting time to be 1-1.5h, enabling a fluorine compound and a chlorine compound to be in physical and chemical changes so as to promote the fluorine compound and the chlorine compound of lead and zinc to be decomposed into gas state, volatilizing low-boiling-point fluorine compound and chlorine compound, enabling the low-boiling-point fluorine compound and chlorine compound to enter a multi-tube zinc removing system, a cloth bag dust collecting system and a desulfurizing tower tail gas processing system so as to remove the low-boiling-point fluorine compound and chlorine compound, cooling the roasted low-grade zinc oxide in the rotary kiln to obtain a finished product. According to the method, the superiorities on the chlorine removing rate, the Zn melting rate and the coal consumption are obvious, nearly one-third coal consumption is reduced; and the elements such as the influence of sulfur-containing elements entrained in coal to the environment and the like can be reduced, and the environment pollution can be lowered greatly.

Positive active material pastes for flooded deep discharge lead-acid batteries, methods of making the same, and lead-acid batteries including the same are provided. The positive active material paste includes a lead compound, a carbon additive, and a silicon additive. The positive active material paste contains carbon additive at a lead to carbon additive weight ratio of 90 to 1900 and a silicon additive at a lead to silicon additive weight ratio of 200 to 4100.

The present invention provides a cationic electrophoretic paint composition which does not contain heavy metal rust inhibitors such as lead compounds from the viewpoint of environmental protection, and at the same time provides a paint film with excellent corrosion resistance. The cationic electrophoretic coating composition comprises a water-soluble or water-dispersible compound containing a phosphonium group, and the compound has a group represented by the above general formula (1), in which the R groups can be the same or Differently, each represents an alkyl group or a hydroxyalkyl group, and at least one R group is a hydroxyalkyl group.

The invention discloses a glass powder for a solar cell right side silver paste. The glass powder is characterized by mainly comprising the following components by weight: 21-5% of SiO, 30.2-4% of Al2O, 1-5% of B2O3, 5-10% of ZnO or Zn3(PO4)2, 0.1-1.5% of BaCO3, 0.1-1.0% of MgO, 15-25% of TeO2, 0.1-1.0% of P2O5, and 60-70% of a lead compound and a bismuth compound. The glass powder provided by the invention can promote the sintering of a conductive silver powder, realize more compact electrode sintering, is conducive to the formation of a good ohmic contact, and has the advantages of reducing the solar cell series resistance and increasing electrode adhesion.

The invention provides a preparation method for a graphene / lead compound composite material. A production method for a lead-acid battery comprises: firstly, performing hydrothermal reaction mixing or ball-milling mixing on a lead compound and graphene oxide to obtain a graphene oxide / lead compound composite material; secondly, assembling the lead-acid battery by taking the graphene oxide / lead compound composite material as an electrode material additive; and thirdly, performing electrochemical reduction on the lead-acid battery to obtain the lead-acid battery containing the graphene / lead compound composite material. The lead-acid battery produced with the method contains the graphene / lead compound composite material, so that the agglomeration of the graphene is avoided, uniform dispersion of the graphene and the lead compound is realized, and the graphene and the lead compound can be uniformly mixed; and moreover, a graphene / lead compound superbattery is easily obtained through the electrochemical reduction, so that the charge acceptance capability of the battery is remarkably improved and the cyclic life of the battery is remarkably prolonged.