(19)
(11) EP 1 534 879 A1

(12)

(43) Date of publication:
01.06.2005 Bulletin 2005/22

(21) Application number: 02807650.3

(22) Date of filing: 05.08.2002
(51) International Patent Classification (IPC)7: C25C 3/06
(86) International application number:
PCT/US2002/024780
(87) International publication number:
WO 2004/013380 (12.02.2004 Gazette 2004/07)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(71) Applicant: Alcoa Inc.
Alcoa Center, PA 15069-001 (US)

(72) Inventors:
  • LACAMERA, Alfred, F.
    Alcoa Center, PA 15069-0001 (US)
  • RAY, Siba, P.
    Alcoa Center, PA 15069-0001 (US)
  • LIU, Xinghua
    Alcoa Center, PA 15069-0001 (US)
  • KOZAREK, Robert, L.
    Alcoa Center, PA 15069-0001 (US)
  • RODDY, Jerry, L.
    Knoxville, TN 37902 (US)

(74) Representative: Carstairs, J. C. 
Forrester & Boehmert,Pettenkoferstrasse 20-22
80336 München
80336 München (DE)

   


(54) METHODS AND APPARATUS FOR REDUCING SULFUR IMPURITIES AND IMPROVING CURRENT EFFICIENCIES OF INERT ANODE ALUMINUM PRODUCTION CELLS