To provide a hydrometallurgical method for nickel oxide ore, in which the plant can be smoothly started after completion of a periodic inspection because zinc sulfide separation imposes no load on a filter cloth and it is possible to reduce the amount of zinc remaining in a mother liquor (dezinced liquid) for nickel recovery to 1 mg/L or less.
After completion of a periodic inspection, the plant is started up in the following manner. In the beginning of the start-up, the neutralized liquid is not sulfided, and a switching valve 39 in feed piping 34 is switched so that the neutralized liquid may be circulated to a dezincification tank 31 through circulatory piping 38. When the flow rate and/or temperature of the neutralized liquid being circulating has reached a given value or higher, the neutralized liquid is sulfided in the dezincification tank to yield a mother liquor for nickel recovery that contains zinc sulfide. The switching valve 39 is switched to transfer the zinc sulfide-containing mother liquor for nickel recovery to a filter device 33 through transfer piping 37.
NAKAI OSAMU
MATSUBARA SATOSHI
| JP2010037626A | 2010-02-18 | |||
| JP2010095788A | 2010-04-30 |
| WO2011129395A1 | 2011-10-20 |
Seiji Iga
Toshiya Fujii
Nobuhiro Noguchi
Yusei Atsuya
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