PAT-NO: JP358088124A
DOCUMENT-IDENTIFIER: JP 58088124 A
TITLE: PALLADIUM PURIFICATION AND RECOVERY
PUBN-DATE: May 26, 1983
INVENTOR-INFORMATION:
NAME COUNTRY
TANIGAWA, TORU
SHIGA, SHOJI
ASSIGNEE-INFORMATION:
NAME COUNTRY
FURUKAWA ELECTRIC CO N/A LTD:THE
APPL-NO: JP56184727
APPL-DATE: November 18, 1981
INT-CL (IPC): C01G055/00 , C22B011/00
US-CL-CURRENT: 423/22
ABSTRACT:
PURPOSE: Contaminated palladium is dissolved in nitric acid, chlorine ion is added to adjust its pH to remove silver and iron by precipitation, a Cu dust is added to cause replace precipitation, the precipitate is treated with a Cu selection solution, then dissolved again with nitric acid, and sulfurous acid is added to recover purified palladium salt simply and reasonably.
CONSTITUTION: Palladium containing a variety of impurities is dissolved in nitric acid and chlorine ion is added, e.g., by adding sodium chloride as well as sodium hydroxide to adjust the pH to 2~3 to cause the precipitation of large amounts of Ag and Fe. The precipitate is removed by filtration, a Cu powder is added to the solution in an amount 0.6~1.8 times that of the palladium contained to cause replace precipitation. The precipitate is recovered by filtration, the remaining Cu powder is removed with a solution for dissolving the Cu powder selectively such as an inorganic acid other than nitric acid and hydrogen peroxide, then filtered again. The precipitate is dissolved in nitric acid again and sulfurous acid or a sulfite salt is added to the solution, while the pH is adjusted to 8~ 12 with sodium hydroxide or the like to form the precipitate of palladium salt, which is recovered.
COPYRIGHT: (C)1983,JPO&Japio
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PAT-NO: JP411036020A
DOCUMENT-IDENTIFIER: JP 11036020 A
TITLE: TREATMENT OF WASTE PRINTED CIRCUIT BOARD
PUBN-DATE: February 9, 1999
INVENTOR-INFORMATION:
NAME COUNTRY
TAKANO, KOICHI
FUJIYOSHI, KATSUSATO
FUJIYOSHI, MASASUKE
ASSIGNEE-INFORMATION:
NAME COUNTRY
KK JUSTY N/A
APPL-NO: JP09207213
APPL-DATE: July 15, 1997
INT-CL (IPC): C22B007/00 , B09B003/00 , B09B005/00 , C22B003/44
ABSTRACT:
PROBLEM TO BE SOLVED: To provide a method for the treatment of waste printed circuit boards, etc., capable of efficiently recovering noble metals such as gold, palladium, rhodium and platinum, and recovering the glass fiber reinforced expoxy resin and polyimide, etc., which cannot be dissolved by acids capable of dissolving the metals.
SOLUTION: This method includes a metal dissolving process for dissolving the waste printed circuit boards, etc., by feeding the boards, etc., into an acid, such as nitric acid, hydrochloric acid, sulfuric acid, capable of dissolving the metals, a non-pollution treatment stage for gases, etc., for making the vapor and gases generated in this metal dissolving process non-pollutant, a recovering process for the noble metals by adding an alkali to the metal dissolving acids contg. the dissolved metal in the metal dissolving stage described above to adjust the pH thereof to 4 to 5 and recovering the precipitated noble metals, such as Pt, Pd, Rh, Os, Ru and Au, by filtering and a non-dissolved matter removing process for removing the non-dissolved matter, such as glass fiber reinforced expoxy resin and polyimide, which are not dissolved in the metal dissolving process.
COPYRIGHT: (C)1999,JPO
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PAT-NO: JP358174532A
DOCUMENT-IDENTIFIER: JP 58174532 A
TITLE: RECOVERY OF PALLADIUM OR NOBLE METAL MIXED IN PALLADIUM
PUBN-DATE: October 13, 1983
INVENTOR-INFORMATION:
NAME COUNTRY
TAKAYAMA, SHINGO
ASSIGNEE-INFORMATION:
NAME COUNTRY
TANAKA KIKINZOKU KOGYO N/A KK
APPL-NO: JP57056462
APPL-DATE: April 5, 1982
INT-CL (IPC): C22B011/04
ABSTRACT:
PURPOSE: To efficiently recover Pd and noble metals mixed in Pd, by dipping a material covered with Pd (or its alloy) in a mixed solution containing a water- soluble iodine solution and an aqueous iodide solution, dissolving the coating Pd (or its alloy) and then reducing it.
CONSTITUTION: A material covered with Pd or a Pd alloy containing other noble metals is dipped in a mixed solution containing a water-soluble iodine solution and an aqueous iodide solution. As said mixed solution, a mixed one comprising 2pts. iodine, 19pts. KI and 22pts. water is used, for instance. After Pd (or its alloy) is dissolved by said dipping treatment, a reducing agent such as hydrazine is added to the dissolved solution to precipitate and recover Pd and the noble metals mixed in Pd. The mixed solution after being subjected to the precipitation treatment can be regenerated by adding anoxidizing agent to it.
COPYRIGHT: (C)1983,JPO&Japio
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PAT-NO: JP403102298A
DOCUMENT-IDENTIFIER: JP 03102298 A
TITLE: RECOVERY OF PALLADIUM
PUBN-DATE: April 26, 1991
INVENTOR-INFORMATION:
NAME COUNTRY
KUBOTA, MASUMITSU
KOBAYASHI, TSUTOMU
ASSIGNEE-INFORMATION:
NAME COUNTRY
JAPAN ATOM ENERGY RES N/A INST
APPL-NO: JP01239889
APPL-DATE: September 18, 1989
INT-CL (IPC): G21F009/10 , C01G055/00 , C02F001/62
US-CL-CURRENT: 423/11, 423/22
ABSTRACT:
PURPOSE: To enable recovery of a palladium Pd by adding an ascorbic acid to a solution containing platinum group elements, such as a high level radioactive liquid waste.
CONSTITUTION: After decreasing nitric acid concentration of a high level radioactive liquid waste down to some 0.5 to 0.3M and removing a Zr, a Mo and a Te as a precipitation, a Pd can be solely and selectively recovered by adding an ascorbic acid to make the concentration to be 0.0588M and agitating under room temperature for 15 minutes. In this occasion, by increment of an adding amount of the ascorbic acid, a recovery efficiency of the Pd is much improved. Also, by adding an oxalic acid after addition of the ascorbic acid, the Pd, with transuranium elements and rare earth elements, can be recovered as a precipitation at higher recovery ion efficiency. In this case, the transuranium elements and the rare earth elements can be easily separated from the Pd during a dissolving stage of the oxalic acid.
COPYRIGHT: (C)1991,JPO&Japio
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PAT-NO: JP402138424A
DOCUMENT-IDENTIFIER: JP 02138424 A
TITLE: METHOD FOR RECOVERING PALLADIUM
PUBN-DATE: May 28, 1990
INVENTOR-INFORMATION:
NAME COUNTRY
HIRAKO, MAMORU
ASSIGNEE-INFORMATION:
NAME COUNTRY
TANAKA KIKINZOKU KOGYO N/A KK
APPL-NO: JP63288652
APPL-DATE: November 15, 1988
INT-CL (IPC): C22B011/00 , C22B007/00
ABSTRACT:
PURPOSE: To easily separate Pd by extraction and to recover the Pd in high yield by crushing a ceramic laminate contg. Pd, allowing the crushed material to react with concd. nitric acid to elute Pd, and further washing the material with dil. nitric acid.
CONSTITUTION: Pd is recovered from a ceramic laminate consisting essentially of BaTiO3 and contg. Pd. The ceramic laminate is firstly crushed preferably to = about 100 mesh particles. The crushed material is allowed to react with =5 N nitric acid or preferably with commercially available 15 N concd. nitric acid to elute Pd. The Pd is filtered off by using =1 N nitric acid as washing water. By this method, Pd is fixed and separated without decreasing filterability, and Pd is recovered in the high yield of about 90%.
COPYRIGHT: (C)1990,JPO&Japio
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PAT-NO: JP403154640A
DOCUMENT-IDENTIFIER: JP 03154640 A
TITLE: METHOD FOR NOBLE METAL RECOVERY FROM METAL CATALYST
PUBN-DATE: July 2, 1991
INVENTOR-INFORMATION:
NAME COUNTRY
OGAWA, HIROSUMI
HORIE, HIDEAKI
ASSIGNEE-INFORMATION:
NAME COUNTRY
NISSAN MOTOR CO LTD N/A
APPL-NO: JP01292414
APPL-DATE: November 13, 1989
INT-CL (IPC): B01J038/52 , B01J038/00 , C01G055/00
ABSTRACT:
PURPOSE: To heighten noble metal recovery efficiency by recovering catalytic components separately from a metal support after taking off a wash coat layer from the metal support by heating the metal catalyst in an aqueous nitric acid solution.
CONSTITUTION: A metal catalyst containing at least one kind of noble metals selected from a group of platinum, palladium, and rhodium as a catalytic component and coated with a wash coat layer comprised of mainly alumina and ceria is heated in an aqueous nitric acid solution or an aqueous nitric acid solution containing an aqueous hydrogen peroxide solution so as to take off the wash coat layer from the metal support. Then, noble metals are separated and recovered from the metal support. Optionally, a method for recovery of the noble metals by dissolving only noble metals using aqua regia or a mixed solution of hydrochloric acid and hydrogen peroxide after the wash coat layer is taken off followed by precipitating and recovering the noble metals is adopted.
COPYRIGHT: (C)1991,JPO&Japio
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PAT-NO: JP355164044A
DOCUMENT-IDENTIFIER: JP 55164044 A
TITLE: RECOVERING PALLADIUM FROM PALLADIUM PLATING WASTE LIQUID
PUBN-DATE: December 20, 1980
INVENTOR-INFORMATION:
NAME COUNTRY
NISHIYAMA, GORO
HAYASHI, HIROSHI
ASSIGNEE-INFORMATION:
NAME COUNTRY
AGENCY OF IND SCIENCE & N/A TECHNOL
APPL-NO: JP54072608
APPL-DATE: June 8, 1979
INT-CL (IPC): C22B011/04 , C01G055/00
ABSTRACT:
PURPOSE: To separate and recover Pd in high yield as sodium chloroplalladate by a method wherein non-electrolytic palladium plating waste liquid is added with HCl and iron powder, and precipitated cpd. is separated and dissolved in HCl, then the solution is evaporated and dried.
CONSTITUTION: Non-electrolytic Pd plating waste liquid contg. Pd is made acidic by adding HCl, then iron powder is added and heated to produce hydrogen. By the reducing action of produced hydrogen, red crystal of sodium chloropalladate is precipitated. The red precipitate is separated from the liquid and dissolved in HCl and the solution is evaporated and dried, so that sodium chloropalladate crystal is separated and recovered in high yield.
COPYRIGHT: (C)1980,JPO&Japio
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