Scandium recovery process

A recovery method, scandium oxide technology, applied in the field of scandium hydroxide, scandium oxide and/or scandium carbonate as resource recovery

Inactive Publication Date: 2016-09-28
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, due to the consideration of the grade, amount of substances, or equipment investment costs, sometimes it is not necessary to set such figure 2 Scandium recovery process described in process S104 and S105

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] [Washing of drain sediment]

[0067] The above-mentioned drained sediment was used as a 20% by weight slurry, stirred at room temperature for 30 minutes, and then the washed washing liquid and the washed precipitate were subjected to solid-liquid separation using a suction filter (ヌッチェ) and a filter bottle. Water was added to the washed precipitate again, and re-washed in the same manner as above. Table 3 shows the composition of the rewashed precipitate after washing and rewashing.

[0068] [table 3]

[0069] Composition of precipitate after rewashing (unit: weight %)

[0070] Ni

Fe

Cr

Si

Al

Ca

Mg

mn

sc

0.04

33.00

1.30

3.20

2.10

7.50

0.49

0.07

0.0009

[0071] As can be seen from Table 3, about 90% of the manganese component contained in the neutralized precipitate can be removed by washing and rewashing.

[0072] [Dissolution of precipitate after rewashing]

[0073] A sulfuric acid solutio...

Embodiment 2

[0075] Except that the washing liquid and the washing precipitate were subjected to solid-liquid separation, the washing precipitate was not washed again, and the washing precipitate was directly dissolved in sulfuric acid solution, the same method as in Example 1 was used to obtain scandium Dissolved solution and dissolved residue. This scandium solution was used as a sample of Example 2.

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Abstract

The purpose of the present invention is to recover roughly purified scandium, which is purified to an extent acceptable for a technique for highly purifying scandium, efficiently and without any complicated operation from a neutralization sediment (drainage sediment) generated in neutralizing acid mine drainage which contains a sulfur component. This scandium recovery process includes a washing step (S1) for washing a neutralization sediment (drainage sediment) and a dissolution step (S2) for subjecting the washed sediment obtained in the washing step (S1) to dissolution in an acid. It is preferable that the process further includes a re-dissolution step (S3) for subjecting a dissolution residue which remains after the dissolution in the dissolution step (S2) to dissolution with an acid. In the washing step (S1), it is preferable that the neutralization sediment (drainage sediment) is washed with a washing liquid until the pH of the post-washing liquid generated in the washing step becomes 6 or higher. In the dissolution step (S2), it is preferable that the washed sediment is dissolved in an acid with the system adjusted to pH 1-4.

Description

technical field [0001] The present invention relates to a method for recovering scandium, more specifically, to a method for neutralizing acid mine drainage containing sulfur components containing scandium hydroxide, scandium oxide and / or scandium carbonate as A method of resource recovery. Background technique [0002] Scandium is very useful as an additive to high-strength alloys and as an electrode material for fuel cells. However, due to the low production volume and high price, it has not been widely used. [0003] In addition, trace amounts of scandium are contained in nickel oxide ores such as laterite and limonite. However, nickel oxide ore has not been industrially utilized as a nickel raw material for a long time due to the low grade of nickel contained in nickel oxide ore. Therefore, little research has been carried out on recovering scandium from nickel oxide ore industrially. [0004] However, in recent years, nickel oxide ore and sulfuric acid are put into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/04C22B7/00
CPCC22B7/00C22B59/00C22B3/06Y02P10/20C22B7/006
Inventor 永仓俊彦尾崎佳智永井秀昌桧垣达也
Owner SUMITOMO METAL MINING CO LTD
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