DE59900461D1 - METHOD FOR THE ELECTROLYTIC REGENERATION OF POLLUTED RHODIUM SOLUTIONS - Google Patents

METHOD FOR THE ELECTROLYTIC REGENERATION OF POLLUTED RHODIUM SOLUTIONS

Info

Publication number
DE59900461D1
DE59900461D1 DE59900461T DE59900461T DE59900461D1 DE 59900461 D1 DE59900461 D1 DE 59900461D1 DE 59900461 T DE59900461 T DE 59900461T DE 59900461 T DE59900461 T DE 59900461T DE 59900461 D1 DE59900461 D1 DE 59900461D1
Authority
DE
Germany
Prior art keywords
rhodium
solution
solutions
cathode area
hexavalent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE59900461T
Other languages
German (de)
Inventor
Sigrid Herrmann
Uwe Landau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OTB Oberflaechentechnik in Berlin GmbH and Co
Original Assignee
OTB Oberflaechentechnik in Berlin GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OTB Oberflaechentechnik in Berlin GmbH and Co filed Critical OTB Oberflaechentechnik in Berlin GmbH and Co
Application granted granted Critical
Publication of DE59900461D1 publication Critical patent/DE59900461D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/18—Regeneration of process solutions of electrolytes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

The invention relates to a method for electrically regenerating rhodium solutions, designed especially for regenerating rhodium solutions containing sulphuric acid and/or phosphoric acid or rhodium chloride solutions. The solution to be regenerated is introduced in the anode area (12) of an electrolytic cell (10), which is separated from the associated cathode area (14) by an ion exchange membrane (16), said cathode area being filled with a dilute acid having a good conductivity. The rhodium solution pH is increased so as to reach a value greater than 10, preferably in the range from 10 to 14, by adding an alkaline solution, i.e. a concentrated hydroxide potassium solution. Electrolysis is carried out at electric densities that are so high that the trivalent rhodium of the rhodium solution is oxidised to form an hexavalent rhodium, and possible impurities are depleted by the ion exchange membrane (16) in the catholytes. Hexavalent rhodium is transferred in the cathode area at a speed slightly smaller than trivalent rhodium, and therefore no noticeable rhodium depletion can be observed. This is particularly true when pH during electrolysis is maintained at a value permanently greater than 1.5 by means of proper addition of alkaline solution.
DE59900461T 1998-02-05 1999-02-05 METHOD FOR THE ELECTROLYTIC REGENERATION OF POLLUTED RHODIUM SOLUTIONS Expired - Fee Related DE59900461D1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19804534A DE19804534C1 (en) 1998-02-05 1998-02-05 Impure rhodium solution is regenerated by anodic oxidation in a cell with a cation exchange membrane
PCT/DE1999/000316 WO1999040238A2 (en) 1998-02-05 1999-02-05 Method for electrically regenerating contaminated rhodium solutions

Publications (1)

Publication Number Publication Date
DE59900461D1 true DE59900461D1 (en) 2002-01-10

Family

ID=7856724

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19804534A Expired - Fee Related DE19804534C1 (en) 1998-02-05 1998-02-05 Impure rhodium solution is regenerated by anodic oxidation in a cell with a cation exchange membrane
DE59900461T Expired - Fee Related DE59900461D1 (en) 1998-02-05 1999-02-05 METHOD FOR THE ELECTROLYTIC REGENERATION OF POLLUTED RHODIUM SOLUTIONS

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19804534A Expired - Fee Related DE19804534C1 (en) 1998-02-05 1998-02-05 Impure rhodium solution is regenerated by anodic oxidation in a cell with a cation exchange membrane

Country Status (6)

Country Link
EP (1) EP1051541B1 (en)
AT (1) ATE209709T1 (en)
AU (1) AU2920599A (en)
DE (2) DE19804534C1 (en)
HK (1) HK1034544A1 (en)
WO (1) WO1999040238A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI818791B (en) * 2022-11-02 2023-10-11 環球晶圓股份有限公司 Processing system and processing method for electroless nickel plating solution

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB662299A (en) * 1949-07-08 1951-12-05 Mond Nickel Co Ltd A process for the purification of rhodium
US3375179A (en) * 1964-10-29 1968-03-26 Litton Systems Inc Method of anodizing beryllium and product thereof
GB1144716A (en) * 1966-03-29 1969-03-05 Ustav Nerostnych Surovin Method of producing rhodium concentrates
GB1491521A (en) * 1975-01-07 1977-11-09 Swarsab Mining Separation and purification of rhodium
ZA775358B (en) * 1977-09-06 1979-04-25 Nat Inst Metallurg The recovery and purification of rhodium
FR2616810B1 (en) * 1987-03-25 1989-08-18 Rhone Poulenc Sante ELECTROCHEMICAL PROCESS FOR RECOVERING METAL RHODIUM FROM AQUEOUS SOLUTIONS OF USED CATALYSTS

Also Published As

Publication number Publication date
EP1051541A2 (en) 2000-11-15
DE19804534C1 (en) 1999-06-24
HK1034544A1 (en) 2001-10-26
ATE209709T1 (en) 2001-12-15
EP1051541B1 (en) 2001-11-28
WO1999040238A3 (en) 1999-09-30
WO1999040238A2 (en) 1999-08-12
AU2920599A (en) 1999-08-23

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee