Method for complex-precipitation aluminum removal in rare earth solution

A rare earth solution and complex precipitation technology, applied in rare earth hydrometallurgy and chemical fields, can solve the problems that the extraction process cannot be carried out smoothly and the operation cost is high, and achieve the effect of low equipment requirements, easy operation and reduced concentration.

Active Publication Date: 2016-06-01
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires precise control and stability of the pH value during the process. Once the pH value fluctuates, emulsification w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] (1) Raw material preparation:

[0019] The rare earth solution is the hydrochloric acid leaching solution of rare earth concentrate: the content of rare earth REO60g / L (the distribution ratio of rare earth elements: Y32.58%, La22.64%, Nd29.45%, Sm7.71%, Gd7.78%), Al 2 O 3 1.13g / L, solution pH=1.

[0020] (2) Precipitation to remove aluminum:

[0021] Extract 100ml of rare earth solution into 300ml Erlenmeyer flask and put it into a constant temperature water bath with magnetic stirring. Weigh 1.21g 8-hydroxyquinoline and dissolve it in 10ml methanol and add it into the Erlenmeyer flask. Stir at a constant temperature of 30℃ for 30min, then use 10 % NaOH or other alkaline solutions slowly adjust the pH of the rare earth solution to 4, continue to stir for 1 min, and then vacuum filter to obtain the filtrate. After the above operations, the Al in the solution 2 O 3 The content is 0.037g / L, the removal rate of aluminum exceeds 96.72%, the concentration of REO is...

Example Embodiment

[0022] Example 2

[0023] (1) Raw material preparation:

[0024] The rare earth solution is the hydrochloric acid leaching solution of rare earth concentrate: the content of rare earth is REO200g / L, (the distribution ratio of rare earth elements: Y29.80%, La20.76%, Pr5.82%, Nd27.48%, Sm6.52%, Gd7.13% , Yb2.49%), Al 2 O 3 3g / L, solution pH=1.

[0025] (2) Precipitation to remove aluminum:

[0026] Extract 100ml of rare earth solution into a 300ml Erlenmeyer flask and put it into a constant temperature water bath with magnetic stirring. Weigh 3.24g 5-chloro-8-hydroxyquinoline and dissolve it in 30ml ethylene glycol and add it to the Erlenmeyer flask. Keep the temperature at 60℃. Stir for 30 min, then slowly adjust the pH of the rare earth solution to 4.5 with 10% NaOH solution, continue to stir for 1 min, and then vacuum filter to obtain the filtrate. Through the above operation, Al in the solution 2 O 3 The content is 0.2g / L, the removal rate of aluminum exceeds 93.21%, the REO concen...

Example Embodiment

[0027] Example 3

[0028] (1) Raw material preparation:

[0029] The rare earth solution is the hydrochloric acid leaching solution of rare earth concentrate: REO274g / L (rare earth element distribution ratio: Y29.80%, La20.76%, Pr5.82%, Nd27.48%, Sm6.52%, Gd7.13%, Yb2.49%), Al 2 O 3 3g / L, solution pH=1.

[0030] (2) Precipitation to remove aluminum:

[0031] Extract 100ml of rare earth solution into a 300ml Erlenmeyer flask and put it into a constant temperature water bath with magnetic stirring. Weigh 4.28g 5-nitro-8-hydroxyquinoline and dissolve it in 40ml acetone and add it to the Erlenmeyer flask. Stir at a constant temperature at 80℃ After 30 minutes, use 10% NaOH solution to slowly adjust the pH of the rare earth solution to 5, continue to stir for 1 minute, and then vacuum filter to obtain the filtrate. After the above operation, the Al 2 O 3 The content is 0.112g / L, the removal rate of aluminum exceeds 96.27%, the concentration of REO is 262.23g / L, and the rare earth loss doe...

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Abstract

The invention relates to a production method for removing aluminum (Al<3+>) and purifying rare earth from a rare earth solution and belongs to the field of rare earth hydrometallurgy and chemistry. The method comprises the following steps that (1) raw materials are prepared, the pH value of the rare earth solution is smaller than or equal to 3, the concentration of REO is 20 g/L-300 g/L, and the concentration of Al2O3 is 0.8 g/L-3 g/L; a complex precipitant is one of hydroxyquinoline or ramifications of the hydroxyquinoline; and (2) precipitation aluminum removal is conducted, the complex precipitant is added into the rare earth solution prepared in the step (1), stirring is conducted at the constant temperature, a reaction is conducted, the pH value of the solution is adjusted, precipitation is conducted, and aluminum-removed rare earth liquid is obtained through vacuum filtration and separation. According to the production method, the rare earth solution containing a large quantity of aluminum ions is treated through the hydroxyquinoline or the ramifications of the hydroxyquinoline, the aluminum ions can be removed from the rare earth solution, the effect that the aluminum ion removal rate reaches 90% or above is guaranteed, the rare earth loss ratio is not larger than 5%, and the aluminum ion concentration in the rare earth solution is greatly decreased.

Description

technical field [0001] The present invention relates to the removal of aluminum (Al 3+ ) The production method of purifying rare earth belongs to the field of rare earth hydrometallurgy and chemistry. Background technique [0002] Rare earth elements are known as "industrial vitamins". They are widely used in modern industry and play a vital role. Rare earth elements occupy an indispensable position in the fields of petroleum, chemical industry, metallurgy, ceramics, glass, and permanent magnet materials. Rare earth minerals are a very important national strategic resource. Ion-adsorption rare earth minerals are a special kind of rare earth mineral resources. The rare earth elements in the minerals are adsorbed on the surface of clay minerals in the form of ions. During the leaching process of rare earth ions using a leaching agent, the heteroions adsorbed on the surface of clay minerals, such as Al 3+ , Ca 2+ , Fe 3+ etc. will be replaced by the leaching agent from the ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/44
CPCC22B3/44C22B59/00Y02P10/20
Inventor 李金辉陈志峰王功秒
Owner JIANGXI UNIV OF SCI & TECH
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