13 results about "Metallic Lead" patented technology

The invention relates to a method for preparing high-purity bismuth by removing impurity lead in refined bismuth through oxidation slagging, and belongs to the technical field of non-ferrous metals. Melting and oxidizing: melting a lead-containing refined bismuth raw material at 300-400 DEG C, adding bismuth oxide into the molten bismuth, and fully stirring to enable the bismuth oxide and lead to generate oxidation reaction to generate lead oxide; slagging reaction: adding boric anhydride (B2O3) into the melt, and enabling the boric anhydride (B2O3) to react with the generated lead oxide to generate lead borate slag; slag salvaging and lead removal: stirring for 30-60 minutes at the temperature of 300-400 DEG C in a heat preservation manner, so that the slagging reaction is fully carried out, generated lead borate slag with lower density floats to the surface of a melt, and a lead-containing slag phase is removed in a mechanical or manual slag salvaging manner; and after the slag salvaging process is finished, cooling the bismuth melt under a protective atmosphere until the bismuth melt is solidified to obtain a lead-removed high-purity bismuth product. According to the method, bismuth oxide and boric anhydride are introduced, metal lead is converted into lead borate slag easy to float, efficient and deep separation of lead and bismuth melt is achieved through the density difference, and the lead content can be reduced to 1 ppm or below.

This invention provides a metal-doped electrode and a method for the electrochemical oxidation of phenol to prepare p-benzoquinone. The metal-doped electrode comprises a conductive substrate material and lead, manganese, and ruthenium metals attached to the surface of the conductive substrate material, wherein the mass ratio of lead, manganese, and ruthenium is 60-95%:2-25%:2-15%. The method for the electrochemical oxidation of phenol to prepare p-benzoquinone uses the metal-doped electrode of this invention as the anode and a lead electrode as the cathode in a two-chamber electrolytic cell containing a diaphragm, and electrolyzes phenol to prepare p-benzoquinone under acidic conditions. The electrode of this invention is corrosion-resistant under acidic conditions and has a long service life. Current density >4000 A / m 2 By controlling the current density, the selectivity of benzoquinone is >90%. The electrode materials used are inexpensive and readily available, the electrochemical process is simple, and the process is safe and reliable, showing great promise for industrialization.

A composition is provided comprising one or more of alpha lead oxide, beta lead oxide, metallic lead. Pb2O3 and Pb3O4, the composition comprising particles comprising sub-particles, the sub-particles having a mean greatest dimension of from 10 to 300 nm. Methods of making such a composition are also described.

The invention discloses a method for recovering metal lead from nickel soot, and belongs to the technical field of hydrometallurgy. According to the method, a chlorine salt ore pulp electrolysis system is adopted, leaching and electro-deposition of lead are synchronously achieved in a diaphragm electrolytic cell, and metal lead is directly obtained from a cathode. The method comprises the following specific steps: washing, drying and grinding a nickel soot raw material, and then adding the nickel soot raw material into an electrolytic cell anode chamber separated by an acid and alkali resistant filter cloth diaphragm; the anode chamber and the cathode chamber are filled with electrolyte with the same composition, and the electrolyte comprises NaCl, HCl, PbCl2 and a dispersing agent; a ruthenium-plated titanium plate is used as an anode, a stainless steel plate is used as a cathode, and electrolysis is carried out under a constant current condition. According to the method, leaching and electrodeposition are integrated, the technological process is short, energy consumption is low, environment friendliness is achieved, lead in the nickel soot can be efficiently recycled, the recycling rate can reach 90% or above, and remarkable economic and environment-friendly benefits are achieved.

The invention belongs to the technical field of treatment of cyanidation tailings, and particularly relates to a comprehensive utilization method of cyanidation tailings in a dangerous waste smelting process. The comprehensive utilization method comprises the following steps: carrying out high-temperature drying on the cyanidation tailings, mixing the dried cyanidation tailings and copper-containing dangerous waste materials, drying the obtained mixture, then pressing bricks, and drying the pressed bricks again, the dried bricks, coke and a flux are mixed and then smelted, gold, silver and copper in the bricks are reduced to obtain matte cast ingots, obtained molten slag is subjected to water quenching, obtained water-quenched slag and metal lead and metal zinc steam obtained through reduction in the smelting process are oxidized through hot air, and lead oxide and zinc oxide are obtained. By means of the comprehensive utilization method, full utilization of the copper-containing dangerous waste materials and the cyanidation tailings can be achieved, gold, silver, copper, lead and zinc in the waste materials can be efficiently recycled, and environmental pollution caused by mass discharge and stockpiling of the gold cyanidation tailings and the copper-containing dangerous waste materials is solved.

This invention discloses a method for recovering lead from waste ash dishes, belonging to the field of resource utilization. The method includes: (1) pretreatment and reduction smelting: the waste ash dishes are crushed and mixed with reducing agent and flux for high-temperature reduction smelting to obtain crude lead alloy and slag; (2) vacuum distillation separation: the crude lead alloy is heated under vacuum to volatilize and condense the lead to obtain metallic lead, and the residue is a precious metal enrichment. This invention adopts a combination process of "reduction smelting enrichment + vacuum distillation separation", which uses physical gas phase separation to replace traditional chemical oxidation separation, avoiding lead oxidation loss and lead-containing flue gas generation. It has the advantages of short process, high recovery rate and environmental friendliness, and is applicable to various sources such as waste ash dishes for fire assay analysis or waste ash dishes for precious lead ash blowing refining.

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.

The invention relates to the technical field of lead-carbon batteries, and particularly discloses a novel polar plate manufacturing process for improving the performance of a lead-carbon battery. Comprising the following steps that S1, a metal lead ingot is subjected to melting and spray powdering, and lead powder is obtained; s2, carrying out ball milling treatment on the carbon material to obtain nano carbon powder; s3, lead powder and nano carbon powder are mixed to obtain mixed slurry; s4, dilute sulphuric acid is added into the mixed slurry, stirring continues, and lead paste is obtained; s5, the lead alloy plate grid is coated with the lead paste; s6, curing the coated plate grid; s7, drying the cured polar plate at the bottom; and S8, carrying out surface treatment on the dried polar plate. The manufacturing process of the novel polar plate with the lead-carbon battery performance can be applied to the fields of new energy automobile start-stop systems, distributed energy storage power stations, communication base station standby power supplies and low-speed electric vehicles, and has the advantages of high utilization rate of polar plate active substances, high battery rate performance, prolonged cycle life and controllable production cost.

The application relates to the technical field of alloy materials, in particular to a preparation method of a lithium-lead alloy Li 17 Pb 83 for nuclear industry. The preparation method comprises the following steps: preparing metal lead and granular metal lithium, the average particle size of the granular metal lithium is 3-10 mm; the metal lead is placed in an oxide crucible of a vacuum induction furnace, and the granular metal lithium is placed in a secondary feeding hopper; after vacuum treatment of the vacuum induction furnace, inert gas is filled; the metal lead is heated and melted, then the granular metal lithium is added into the lead melt at a rate of 5-15 g / min; and then smelting is carried out at 285-335 DEG C for 10-30 min, and then casting is formed. Through the above process, the lithium-lead alloy Li 17 Pb 83 prepared by the application has uniform components, and secondary smelting is not needed, and the alloy ingot has good melting point and component consistency.

An ammonium complex system-based method for separating and purifying lead, zinc, cadmium, and copper, comprising the following steps: a zinc-containing raw material is leached using a leach solution to produce a leached solution; a filtrate and a filter residue are produced by filtration; the filtrate is mixed with metal lead to displace copper, undergoes a solid-liquid separation to produce a first separated liquid, is mixed with metal cadmium to displace lead, undergoes a solid-liquid separation to produce a second separated liquid, is mixed with metal zinc to displace cadmium, and undergoes a solid-liquid separation to produce a third separated liquid; and, the third separated liquid is electrolyzed to produce metal zinc, and an electrolytic solution is returned to the leaching step.

The invention provides an electrode, a three-electrode assembly and a preparation method and application of the three-electrode assembly. The electrode comprises a base body and a functional layer arranged on the surface of the base body. The functional layer comprises a copper-carbon base material and nano stainless steel particles contained in the copper-carbon base material; the mass ratio of copper to carbon in the copper-carbon matrix material is (0.8-1.0): 1. The electrode has good sensitivity and sensing effect on heavy metal lead ions, cadmium ions and mercury ions, has the advantages of strong specificity, high sensitivity and good accuracy, and has wide application prospects in detection of cadmium, lead and mercury in food.

This invention discloses a lead-zinc smelting method and system using coke and coal as fuels. The method includes steps for zinc smelting in a closed blast furnace, and further includes a pulverized coal injection step: reducing the coke feed rate and decreasing the hourly coke feed amount; injecting pulverized coal from the tuyeres of the closed lead-zinc blast furnace into the furnace. This smelting method is capable of simultaneously producing metallic lead and metallic zinc. Based on the traditional ISP zinc smelting process, it replaces part of the coke with coal, reducing coke consumption and lowering smelting production costs.