(19)
(11) EP 2 864 052 A1

(12)

(43) Date of publication:
29.04.2015 Bulletin 2015/18

(21) Application number: 13719704.2

(22) Date of filing: 12.04.2013
(51) International Patent Classification (IPC): 
B03D 1/01(2006.01)
B03D 1/018(2006.01)
 B03D 1/016(2006.01)
(86) International application number:
PCT/BR2013/000121
(87) International publication number:
WO 2013/152412 (17.10.2013 Gazette 2013/42)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 12.04.2012 US 201261623459 P

(71) Applicants:
  • Vale S.A.
    Cep: 20030-000 Rio de Janeiro - RJ (BR)
  • Dong, Jie
    Mississauga, Ontario L5K 1Z9 (CA)
  • Xu, Manqiu
    Mississauga, Ontario L5K 1Z9 (CA)

(72) Inventors:
  • DONG, Jie
    Mississauga, Ontario L5K 1Z9 (CA)
  • XU, Manqiu
    Mississauga, Ontario L5K 1Z9 (CA)

(74) Representative: CAPRI 
33, rue de Naples
75008 Paris
75008 Paris (FR)

   


(54) A METHOD FOR IMPROVING SELECTIVITY AND RECOVERY IN THE FLOTATION OF NICKEL SULPHIDE ORES THAT CONTAIN PYRHOTITE BY EXPLOITING THE SYNERGY OF MULTIPLE DEPRESSANTS