Method for producing high-purity scandium oxide

Patent metadata

Field	Value
Publication number	US-10968112-B2
Application number	US-201916964353-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Jan 25, 2018
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

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.

First claim

The invention claimed is:

1. A method for producing high-purity scandium oxide, the method comprising:
a first calcination step of subjecting a solution containing scandium to an oxalate formation treatment using oxalic acid and calcinating crystals of obtained scandium oxalate at a temperature of 400° C. to 600° C.;
a dissolution step of dissolving a scandium compound obtained by calcinating, in at least one selected from hydrochloric acid and nitric acid to obtain a solution;
a reprecipitation step of subjecting the solution to an oxalate formation treatment using oxalic acid to generate a reprecipitation product of scandium oxalate; and
a second calcination step of calcinating the obtained reprecipitation product of scandium oxalate to obtain scandium oxide.

2. The method for producing high-purity scandium oxide according to claim 1 ,
wherein in the reprecipitation step, the oxalate formation treatment is performed while a temperature of the solution is adjusted to 40° C. or higher and lower than 100° C.

3. The method for producing high-purity scandium oxide according to claim 1 , wherein in the second calcination step, the calcination is performed while a calcination temperature is set to 900° C. or higher.

4. The method for producing high-purity scandium oxide according to claim 1 ,
wherein the solution containing scandium is obtained by subjecting a raw solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

5. The method for producing high-purity scandium oxide according to claim 2 , wherein in the second calcination step, the calcination is performed while a calcination temperature is set to 900° C. or higher.

6. The method for producing high-purity scandium oxide according to claim 2 , wherein the solution containing scandium is obtained by subjecting a raw solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

7. The method for producing high-purity scandium oxide according to claim 3 , wherein the solution containing scandium is obtained by subjecting a raw solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

8. The method for producing high-purity scandium oxide according to claim 5 , wherein the solution containing scandium is obtained by subjecting a raw solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Higaki Tatsuya
• Kobayashi Hiroshi

Classifications

• C01F17/32 Primary

  oxide or hydroxide being the only anion, e.g. NaCeO2 or MgxCayEuO · CPC title

• C01F17/282 Primary

  Sulfates · CPC title

• C01F17/212

  Scandium oxides or hydroxides · CPC title

• C22B3/10

  Hydrochloric acid {, other halogenated acids or salts thereof} · CPC title

• C22B3/06

  in inorganic acid solutions {, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions} · CPC title