SCANDIUM PURIFICATION METHOD - SUMITOMO METAL MINING CO

Title:

SCANDIUM PURIFICATION METHOD

Document Type and Number:

WIPO Patent Application WO/2017/159372

Kind Code:

A1

Abstract:

In separating scandium and thorium from a leachate obtained by adding sulfuric acid to a nickel oxide ore containing scandium and thorium, scandium is recovered from only one system so as to simplify the process and achieve a high yield at the same time. The method according to the present invention comprises: an extraction step S1 for treating a nickel oxide ore containing scandium and thorium with sulfuric acid to give an acidic solution (a feed solution for extraction), and then solvent-extracting the feed solution with the use of a scandium extractant containing an amide derivative to thereby divide the feed solution into an organic extract (a first organic phase) containing scandium and thorium and a liquid extract (a first aqueous phase) containing impurities; and a washing step S2 for adding sulfuric acid to the organic extract (the first organic phase) and thus dividing the same into washed organic matters (a second organic phase) containing thorium and a washed liquid (a second aqueous phase) containing scandium. In this method, the pH value in the extraction step S1 is regulated to 1.0-3.0 inclusive and the pH value in the washing step S2 is regulated to 1.0-2.5 inclusive.

Inventors:

SENBA YUSUKE (JP)
MATSUOKA ITSUMI (JP)
KOBAYASHI HIROSHI (JP)

Application Number:

PCT/JP2017/008161

Publication Date:

September 21, 2017

Filing Date:

March 01, 2017

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO (JP)

International Classes:

C22B59/00; C22B3/08; C22B3/26

Domestic Patent References:

WO2014110216A1

2014-07-17

Foreign References:

JP2015163729A	2015-09-10
JP2013189675A	2013-09-26
JP2014034718A	2014-02-24
JPH09324227A	1997-12-16
JPH03173725A	1991-07-29
JPH09194211A	1997-07-29
JPH09291320A	1997-11-11

Other References: