(19)
(11) EP 0 508 542 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.10.1993 Bulletin 1993/42

(43) Date of publication A2:
14.10.1992 Bulletin 1992/42

(21) Application number: 92200989.9

(22) Date of filing: 07.04.1992
(51) International Patent Classification (IPC)5: C22B 1/02
(84) Designated Contracting States:
DE ES FR GR

(30) Priority: 11.07.1991 DE 4122894
11.07.1991 DE 4122895
12.04.1991 US 684649

(71) Applicant: METALLGESELLSCHAFT Aktiengesellschaft
D-60015 Frankfurt (DE)

(72) Inventors:
  • Hannaford, Anthony L.
    Littleton, CO 80122 (US)
  • Le Vier, Marc K.
    Salt Lake City, UT 84121 (US)
  • Fernandez, Rene R.
    Salt Lake City, UT 84121 (US)
  • Ramadorai, Gopalan
    Tuscon, AZ 85749 (US)
  • Fitting, Arno, Dr.
    W-6392 Neu-Anspach, (DE)
  • Samant, Gurudas Dr.
    W-3555 Fronhausen, (DE)
  • Peinemann, Bodo
    W-6000 Frankfurt am Main 50 (DE)
  • Bandel, Gebhard
    W-6000 Frankfurt am Main (DE)
  • Kofalck, Hans
    W-6234 Hattersheim (DE)


(56) References cited: : 
   
       


    (54) Process for treating ore having recoverable metal values including arsenic containing components


    (57) Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in presence of oxygen injected initially or supplementally in a roaster such as in a circulating fluid bed roaster; volatilized arsenic in roasting of ores may also be converted to an insoluble form in gas phase in a two stage roaster process after removal of solids from a gas phase and contact with an additive at high oxygen concentration in a second stage roaster.






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