Method for producing scandium compound, and scandium compound

Patent metadata

Field	Value
Publication number	US-2021284546-A1
Application number	US-201716328360-A
Country	US
Kind code	A1
Filing date	Aug 23, 2017
Priority date	Aug 30, 2016
Publication date	Sep 16, 2021
Grant date	—

Abstract

Provided is a method for producing, from scandium oxalate crystals obtained through an oxalate conversion process, a readily-soluble scandium compound that dissolves easily in an aqueous solution such as an acid. This method for producing a scandium compound involves carrying out an oxalate conversion process using oxalic acid in a solution containing scandium, separating the product obtained through the oxalate conversion process into a liquid and scandium oxalate crystals, and obtaining a scandium compound by roasting the obtained scandium oxalate crystals at a temperature of 400° C. to 800° C., preferably 400° C. to 600° C.

First claim

1 . A method for producing a scandium compound, comprising:
subjecting a solution containing scandium to an oxalate conversion treatment using oxalic acid to separate the solution into a liquid and a scandium oxalate crystal; and subjecting the scandium oxalate crystal obtained to a calcination treatment under a temperature condition in a range of between 400° C. or more and 600° C. or less to obtain a scandium compound.

2 . A method for producing a scandium compound, comprising:
subjecting a solution containing scandium to an oxalate conversion treatment using oxalic acid to separate the solution into a liquid and a scandium oxalate crystal; and subjecting the scandium oxalate crystal obtained to a calcination treatment under a temperature condition in a range of between 400° C. or more and 800° C. or less to obtain a scandium compound.

3 . The method for producing a scandium compound according to claim 1 , wherein the scandium oxalate crystal is retained for 1 hour or more and 12 hours or less to be calcined in the calcination treatment.

4 . The method for producing a scandium compound according to claim 1 , wherein a weight decrease rate of the scandium compound obtained by the calcination treatment with respect to a weight of the scandium oxalate crystal before the calcination treatment is in a range of between 55% or more and 65% or less.

5 . The method for producing a scandium compound according to claim 1 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

6 . A scandium compound, wherein a half peak width at a diffraction angle 2θ of 12.3° measured by an X-ray diffraction method is 0.2 or more or is not detected and a half peak width at a diffraction angle 2θ of 31.4° is 0.2 or more or is not detected.

7 . The scandium compound according to claim 6 , wherein a crystallite diameter calculated from the half peak width at a diffraction angle 2θ of 12.3° or 31.4° based on Scherrer equation is 350 Å or less.

8 . The scandium compound according to claim 6 , wherein a BET specific surface area of the scandium compound is 70 m 2 /g or more, and
a peak intensity of scandium oxide measured by an X-ray diffraction method is 11000 counts or less.

9 . The method for producing a scandium compound according to claim 2 , wherein the scandium oxalate crystal is retained for 1 hour or more and 12 hours or less to be calcined in the calcination treatment.

10 . The method for producing a scandium compound according to claim 2 , wherein a weight decrease rate of the scandium compound obtained by the calcination treatment with respect to a weight of the scandium oxalate crystal before the calcination treatment is in a range of between 55% or more and 65% or less.

11 . The method for producing a scandium compound according to claim 3 , wherein a weight decrease rate of the scandium compound obtained by the calcination treatment with respect to a weight of the scandium oxalate crystal before the calcination treatment is in a range of between 55% or more and 65% or less.

12 . The method for producing a scandium compound according to claim 9 , wherein a weight decrease rate of the scandium compound obtained by the calcination treatment with respect to a weight of the scandium oxalate crystal before the calcination treatment is in a range of between 55% or more and 65% or less.

13 . The method for producing a scandium compound according to claim 2 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

14 . The method for producing a scandium compound according to claim 3 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

15 . The method for producing a scandium compound according to claim 4 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

16 . The method for producing a scandium compound according to claim 9 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

17 . The method for producing a scandium compound according to claim 10 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

18 . The method for producing a scandium compound according to claim 11 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

19 . The method for producing a scandium compound according to claim 12 , wherein the solution containing scandium is obtained by subjecting a solution containing scandium to an ion exchange treatment and/or a solvent extraction treatment.

20 . The scandium compound according to claim 7 , wherein a BET specific surface area of the scandium compound is 70 m 2 /g or more, and
a peak intensity of scandium oxide measured by an X-ray diffraction method is 11000 counts or less.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Higaki Tatsuya
• Kobayashi Hiroshi

Classifications

• C22B1/02

  Roasting processes (C22B1/16 takes precedence) · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C22B3/44

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title

• C01F17/13

  by using ion exchange resins, e.g. chelate resins · CPC title

• Y02P10/20

  Recycling · CPC title