24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21)
(22) Date of filing of Application: 06/06/2003 (43)
Application No: 581/MUMNP/2003 A
Publication Date: 24/06/2005
(54) Title of the invention: METHOD FOR LEACHING COPPER CONCENTRATE
(51) International Classification : C 22 B 15/00 (71)
(31) Priority Document No. : 200002802
(32) Priority Date : 20/12/2000
(33) Name of priority country : FINLAND
(86)
International Application
No.
: PCT/FI01/01080
Filing Date : 11/12/2001
(87) International Publication
No.
: WO 02/50319 A1
(61) Patent of addition to
Application No.
: NIL
Filed on : N.A.
(62)
(57) Abstract:
Divisional to Application
No.
: NIL
Filed on : N.A.
(72)
Name of the Applicant:
OUTOKUMPU OYJ
Address of the Applicant:
RIIHITONTUNTIE 7,
FIN-02200 ESPOO, FINLAND.
Name of the Inventors:
1. HAMALAINEN MATTI
Filed U/S 5(2) before the
Patents (Amendment)
Ordinance, 2004: NO
This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the
countercurrent principle, in a chloride environment. The leaching takes place with the aid of bivalent
copper and an oxygen-bearing gas as a multistage continuous process, under normal pressure, at a
temperature, which as highest corresponds to the boiling point of the solution. Part of the insoluble solid
matter is returned, counter to the main flow of solid matter, to one of the previous leaching stages or
reactors where, as a result of the extended leaching time, the leach waste iron is recovered mostly as
hematite.
(FIG.: NIL)
Total Pages: 9.
The Patent Office Journal 24.06.2005 17785