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Title:
METHOD FOR PRODUCING HIGH-PURITY SCANDIUM OXIDE
Document Type and Number:
WIPO Patent Application WO/2019/146619
Kind Code:
A1
Abstract:
Provided is a method for obtaining high-purity scandium oxide efficiently from a solution containing scandium. The method for producing high-purity scandium oxide of the present invention has a first firing step S12 for subjecting a solution containing scandium to oxalation treatment using oxalic acid and firing the obtained crystals of scandium oxalate at a temperature of 400 to 600°C, inclusive, a dissolution step S13 for dissolving the scandium compound obtained by firing in one or more solutions selected from hydrochloric acid and nitric acid to obtain a solution, a reprecipitation step S14 for subjecting the solution to oxalation treatment using oxalic acid and generating a reprecipitate of scandium oxalate, and a second firing step S15 for firing the reprecipitate of obtained scandium oxalate to obtain scandium oxide.

Inventors:
HIGAKI TATSUYA (JP)
KOBAYASHI HIROSHI (JP)
Application Number:
JP2019/002012
Publication Date:
August 01, 2019
Filing Date:
January 23, 2019
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO (〒1058716, JP)
International Classes:
C01F17/00; C22B1/02; C22B3/06; C22B3/10; C22B59/00
Domestic Patent References:
WO2018043704A12018-03-08
Foreign References:
JP2016153534A2016-08-25
JPH04198017A1992-07-17
JPH09324227A1997-12-16
JP2016507636A2016-03-10
JPH08232026A1996-09-10
Other References:
HEAD, E. L. ET AL.: "THE THERMAL DECOMPOSITION OF SCANDIUM FORMATE AND OXALATE", J. INORG. NUCL. CHEM., vol. 26, April 1964 (1964-04-01), pages 525 - 530, XP055540679, ISSN: 00221902
XIU, ZHIMENG ET AL.: "Nanocrystalline Scandia Powders Via Oxalate Precipitation: The Effects of Solvent and Solution pH", J. AM. CERAM. SOC., vol. 91, no. 2, 17 January 2008 (2008-01-17), pages 603 - 606, XP055628689, ISSN: 1551-2916
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (〒1000005, JP)
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