HYDROMETALLURGICAL METHOD FOR REFINING NICKEL OXIDE ORE

Title:

HYDROMETALLURGICAL METHOD FOR REFINING NICKEL OXIDE ORE

Document Type and Number:

WIPO Patent Application WO/2018/066638

Kind Code:

A1

Abstract:

Provided is a hydrometallurgical method for refining nickel oxide ore, the method being capable of improving production efficiency by suppressing premature blockage of a filtration device. The method comprises: a leaching step for acid-leaching nickel oxide ore at a high pressure; a solid-liquid separation step in which the resulting leached slurry is washed and then solid-liquid separated to obtain a nickel-containing leachate; a neutralization step in which a neutralized sediment obtained by adding a neutralizing agent and a coagulant to the leachate is solid-liquid separated from a nickel-containing neutralized final solution; a dezincification step in which a slurry, which contains a zinc sulfide obtained by adding a sulfurizing agent to the neutralized final solution, is solid-liquid separated to obtain a zinc sulfide and a post-dezincification liquid; and a nickel recovery step in which a nickel-containing mixed sulfide obtained by adding a sulfurizing agent to the post-dezincification liquid is solid-liquid separated from a post-sulfurization liquid, wherein the addition amount of the neutralizing agent is adjusted such that the concentration of Fe in the neutralized final solution obtained in the neutralization step is 1.25 g/L or less.

Inventors:

MIYAMOTO TAKASHI (JP)
SHIBAYAMA KEISUKE (JP)

Application Number:

PCT/JP2017/036245

Publication Date:

April 12, 2018

Filing Date:

October 05, 2017

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO (JP)

International Classes:

C22B23/00

Foreign References:

JP2010037626A	2010-02-18
JP2005350766A	2005-12-22
JP2010037626A	2010-02-18

Other References: