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Scandium recovery method

A recovery method and process technology, which is applied to the field of high-efficiency recovery of scandium contained in nickel oxide ore, and can solve the problems of low grade nickel content

Inactive Publication Date: 2016-08-24
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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, the industrial recovery of scandium from nickel oxide ores has also been hardly studied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] [Leaching process S1]

[0121]First, nickel oxide ore and concentrated sulfuric acid are put into an autoclave, and a slurry containing valuable metals such as scandium and nickel is generated at 245°C for 1 hour, and solid-liquid separation from the slurry contains various The leaching liquid and leaching residue of valuable metals.

[0122] [Neutralization process S2]

[0123] Calcium carbonate is then added to the leach liquor to obtain a neutralized precipitate and a neutralized liquor. The neutralized liquid contains valuable metals such as scandium and nickel, and the neutralized precipitate contains most of the impurities represented by aluminum.

[0124] [Vulcanization process S3]

[0125] Next, hydrogen sulfide gas is blown into the neutralized liquid to form sulfides from nickel, cobalt, and zinc, which are separated from the sulfided liquid.

[0126] [Ion exchange step S4]

[0127] [Adsorption step S41]

[0128] Slaked lime was added as a neutralizing a...

Embodiment 2

[0175] The same scandium oxide ore as in Example 1 above was leached, neutralized, and vulcanized by the same method as in Example 1 above to obtain a sulfide liquid with the composition shown in Table 7.

[0176] Composition of liquid after table 7 vulcanization

[0177] sc

Al

Fe

Th

U

14

2800

1000

0.2

0.7

[0178] (unit is mg / L)

[0179] Carry out ion exchange process and concentration process with the method identical with above-mentioned embodiment 1, redissolve the obtained scandium hydroxide with sulfuric acid, obtain chelating eluent hydroxide solution. Table 8 shows the results of analyzing the composition of the chelate eluent hydroxide solution.

[0180] The composition of table 8 chelating eluent hydroxide solution

[0181] sc

Al

Fe

Th

U

20

11

4

140

220

[0182] (unit is mg / L)

[0183] The chelated eluent hydroxide solution having the composition shown in Table 8 was us...

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Abstract

In order to recover high-quality scandium from nickel oxide ores efficiently, this method comprises: a leaching step (S1) for feeding Ni oxide ores and sulfuric acid into a pressure vessel, and subjecting the mixture to solid-liquid separation to form a leachate and a leach residue; a neutralization step (S2) for adding a neutralizing agent to the leachate, and thus forming a neutralization sediment and a post-neutralization fluid; a sulfurization step (S3) for adding a sulfurizing agent to the post-neutralization fluid, and separating the obtained mixture into Ni sulfide and a post-sulfurization fluid; an ion-exchange step (S4) for bringing the post-sulfurization fluid into contact with a chelating resin, making Sc adsorbed on the chelating resin, and forming an Sc eluate; a solvent extraction step (S6) for bringing the Sc eluate into contact with an extracting agent, adding a back-extraction agent to the extract, and thus forming back-extracted matter; and a roasting step (S8) for roasting the back-extracted matter, and thus forming Sc oxide. It is preferable that the method further includes, after the ion exchange step (S4), a concentration step (S5) for forming a sediment from the Sc eluate and dissolving the sediment in an acid, and includes, after the solvent extraction step (S6), an Sc precipitation step (S7) for dissolving the back-extracted matter in hydrochloric acid, adding oxalic acid to the obtained solution, and thus forming Sc oxalate crystals.

Description

technical field [0001] The present invention relates to a method for recovering scandium, and in more detail relates to a method for efficiently recovering scandium contained in nickel oxide ore by using a chelating resin and solvent extraction with an acidic extractant. Background technique [0002] Scandium is very useful as an additive to high-strength alloys and as an electrode material for fuel cells. However, it is not widely used because of low production volume and high price. [0003] Nickel oxide ores such as laterite nickel ore and limonite contain trace amounts of scandium. However, nickel oxide ore has not been industrially utilized as a nickel raw material for a long time due to low nickel content in nickel oxide ore. Therefore, the industrial recovery of scandium from nickel oxide ores has hardly been studied. [0004] However, in recent years, the HPAL process in which nickel oxide ore and sulfuric acid are put into a pressurized vessel, heated to a high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/04C22B3/20C22B3/24C22B3/44
CPCC22B3/44C22B3/08C22B3/42C22B59/00C22B3/26Y02P10/20C22B21/0015C22B34/32
Inventor 桧垣达也尾崎佳智松本伸也松冈逸见永井秀昌永仓俊彦工藤敬司
Owner SUMITOMO METAL MINING CO LTD
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