5 results about "Metallic Lead" patented technology

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.

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 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.