SCANDIUM RECOVERY METHOD - SUMITOMO METAL MINING CO

Title:

SCANDIUM RECOVERY METHOD

Document Type and Number:

WIPO Patent Application WO/2015/115269

Kind Code:

A1

Abstract:

In order to recover high-quality scandium from nickel oxide ores efficiently, this method comprises: a leaching step (S1) for feeding Ni oxide ores and sulfuric acid into a pressure vessel, and subjecting the mixture to solid-liquid separation to form a leachate and a leach residue; a neutralization step (S2) for adding a neutralizing agent to the leachate, and thus forming a neutralization sediment and a post-neutralization fluid; a sulfurization step (S3) for adding a sulfurizing agent to the post-neutralization fluid, and separating the obtained mixture into Ni sulfide and a post-sulfurization fluid; an ion-exchange step (S4) for bringing the post-sulfurization fluid into contact with a chelating resin, making Sc adsorbed on the chelating resin, and forming an Sc eluate; a solvent extraction step (S6) for bringing the Sc eluate into contact with an extracting agent, adding a back-extraction agent to the extract, and thus forming back-extracted matter; and a roasting step (S8) for roasting the back-extracted matter, and thus forming Sc oxide. It is preferable that the method further includes, after the ion exchange step (S4), a concentration step (S5) for forming a sediment from the Sc eluate and dissolving the sediment in an acid, and includes, after the solvent extraction step (S6), an Sc precipitation step (S7) for dissolving the back-extracted matter in hydrochloric acid, adding oxalic acid to the obtained solution, and thus forming Sc oxalate crystals.

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JP5334592	Rare metal recovery method in zinc leaching process
WO/2006/078901	PROCESS FOR THE RECOVERY OF MATERIALS FROM A DESULFURIZATION REACTION

Inventors:

HIGAKI TATSUYA (JP)
OZAKI YOSHITOMO (JP)
MATSUMOTO SHIN-YA (JP)
MATSUOKA ITSUMI (JP)
NAGAI HIDEMASA (JP)
NAGAKURA TOSHIHIKO (JP)
KUDO KEIJI (JP)

Application Number:

PCT/JP2015/051501

Publication Date:

August 06, 2015

Filing Date:

January 21, 2015

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO (JP)

International Classes:

C22B3/04; C22B59/00; C22B3/20; C22B3/24; C22B3/44

Foreign References:

JPH09194211A	1997-07-29
JPH09291320A	1997-11-11
JP2014001430A	2014-01-09
JP2014012901A	2014-01-23
JPH09208222A	1997-08-12
JP2014218719A	2014-11-20
JPH03173725A	1991-07-29
JPH01133920A	1989-05-26
JPH09176756A	1997-07-08
JPH09194211A	1997-07-29
JPH09291320A	1997-11-11

Other References: