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Method for recovering scandium

a scandium and scandium technology, applied in the field of recovering scandium, can solve the problems of rare study to industrially recover scandium from nickel oxide ore, nickel oxide ore has not been industrially utilized as a nickel raw material, and scandium has not yet been widely used, etc., to achieve simple and efficient recovery and high purity

Inactive Publication Date: 2019-01-24
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention explains how to easily and efficiently recover high purity scandium from nickel oxide ore.

Problems solved by technology

However, scandium has not yet been used widely due to the small production quantity and high cost thereof.
However, nickel oxide ore has not been industrially utilized as a nickel raw material for a long time since it contains nickel at a low grade.
Hence, it has been rarely studied to industrially recover scandium from nickel oxide ore.
However, some impurity elements exhibit behavior similarly to that of scandium in the chelating resins and the organic solvents disclosed in Patent Document 2 and Patent Document 3, and it is thus difficult to effectively separate and recover scandium.
In addition, impurities such as iron and aluminum are contained in the leachate of nickel oxide ore at much higher concentrations than scandium, and a method suitable for industrial recovery of high purity scandium from nickel oxide ore has not been found out since the recovery of scandium is also affected by these large amounts of impurities.
As described above, it has been difficult to efficiently recover high purity scandium by effectively separating a large variety of impurities such as iron and aluminum contained in large amounts even when it is attempted to recover scandium from nickel oxide ore.Patent Document 1: Japanese Unexamined Patent Application, Publication No.

Method used

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  • Method for recovering scandium
  • Method for recovering scandium
  • Method for recovering scandium

Examples

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example 1

(First Stage of Neutralization)

[0106]Based on the results shown in FIG. 4, the scandium eluate having a composition shown in Table 2 was placed in a container and a 4 N sodium hydroxide solution was added thereto with stirring so that the pH of the solution was adjusted to 4, thereby performing the first stage of neutralization treatment.

[0107]After this first stage of neutralization treatment, solid-liquid separation was performed using filter paper and Nutsche, and as a result, a primary neutralized precipitate and a primary neutralized filtrate were obtained.

[0108]By analysis using ICP, the ratio (partitioning) of the amount of a precipitate generated to the amount of substance contained in the scandium eluate having the composition shown in Table 2 was evaluated as the precipitation rate (%). Table 3 below shows the precipitation rates by the first stage of neutralization treatment.

TABLE 3Precipitationrate of eachelementcomponentScAlFeNiCr[%]4489050

[0109]As shown in Table 3, iro...

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Abstract

The method for recovering scandium pertaining to the present invention has: a first neutralization step for passing a solution containing scandium over an ion exchange resin, adding a neutralizing agent to the eluent eluted from the ion exchange resin and performing a neutralization treatment, and obtaining a primary neutralized sediment and a primary neutralized filtrate by solid-liquid separation; a second neutralization step for further adding a neutralizing agent to the primary neutralized filtrate and performing a neutralization treatment, and obtaining a secondary neutralized sediment and a secondary neutralized filtrate by solid-liquid separation; a hydroxide dissolution step for adding acid to the secondary neutralized sediment and obtaining a hydroxide solution; a solvent extraction step for subjecting the hydroxide solution to solvent extraction; and a scandium recovery step for recovering scandium oxide from a raffinate separated in the solvent extraction step.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for recovering scandium, and more particularly, it relates to a method for recovering scandium by which scandium contained in nickel oxide ore is easily and efficiently recovered.BACKGROUND ART[0002]Scandium is extremely valuable as an additive for high-strength alloys and an electrode material for fuel cells. However, scandium has not yet been used widely due to the small production quantity and high cost thereof.[0003]Incidentally, a trace amount of scandium is contained in nickel oxide ore such as laterite ore and limonite ore. However, nickel oxide ore has not been industrially utilized as a nickel raw material for a long time since it contains nickel at a low grade. Hence, it has been rarely studied to industrially recover scandium from nickel oxide ore.[0004]Nonetheless, in recent years, the HPAL process has been emerging as a practical method, in which nickel oxide ore is introduced into a pressure vessel along wi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22B59/00C22B3/08C22B3/24C22B3/42C22B3/44
CPCC22B59/00C22B3/08C22B3/24C22B3/42C22B3/44Y02P10/20C22B3/26
Inventor HIGAKI, TATSUYAMATSUMOTO, SHIN-YANAGAI, HIDEMASAKOBAYASHI
Owner SUMITOMO METAL MINING CO LTD
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