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Method for separating rare earth from aluminum by complexation

A complex separation and rare earth technology, applied in the direction of improving process efficiency, can solve the problems of harsh condition control, unfavorable aluminum recycling, difficulty in rare earth enrichment and separation, etc., and achieves efficient separation and enlarges the effect of pH value difference.

Active Publication Date: 2018-12-07
GANZHOU ZHANHAI IND & TRADING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the condition control of this method is relatively harsh, and rare earths also have stable complexation, which leads to difficulties in the subsequent enrichment and separation of rare earths; and the separation of complexes and aluminum is very difficult, which is not conducive to the recycling of aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Using a solution containing 10g / L lanthanum chloride (calculated as REO), 0.3g / L aluminum chloride, and a pH of 4.2 as the raw material solution, add glycine complexing agent to the solution, and the amount of complexing agent added is 110% of the theoretical amount required by the ion to obtain a complex solution; use sodium hydroxide to adjust the pH value of the complex solution to 6.0, filter and wash to obtain pure lanthanum chloride solution and aluminum slag, the precipitation rate of aluminum in this process is 99.3 wt.%, the precipitation rate of lanthanum was 1.24wt.%. Continue to add sodium hydroxide precipitant to the lanthanum chloride solution, control the pH of the precipitation end point to 11.0, filter and wash to obtain the lanthanum hydroxide precipitate and filtrate, and the precipitation rate of lanthanum is 99.4wt.%.

Embodiment 2

[0039] Use ammonium sulfate to leach ion-adsorption type rare earth ore to obtain rare earth leaching solution. The concentration of rare earth in the leaching solution is 2.0g / L (calculated as REO), the concentration of aluminum is 0.2g / L, and its pH is 4.4. Add triglycerides to the solution complexing agent, the amount of complexing agent added is 100% of the theoretical amount required for complexing rare earth ions to obtain a complexing solution; use sodium carbonate to adjust the pH value of the complexing solution to 6.0, filter and wash to obtain pure rare earth solution and aluminum slag, During this process, the precipitation rate of aluminum was 99.4wt.%, and the precipitation rate of rare earth was 1.33wt.%. Continue to add sodium hydroxide precipitation agent to the rare earth solution, control the pH of the precipitation end point to 10.0, filter and wash to obtain the rare earth hydroxide precipitate and filtrate, and the precipitation rate of the rare earth is 9...

Embodiment 3

[0041] A solution containing 0.3g / L yttrium sulfate (calculated as REO), 0.05g / L aluminum sulfate, and a pH of 3.5 is used as a raw material solution, and an acetic acid complexing agent is added to the solution. 90% of the theoretical amount is required to obtain a complex solution; calcium oxide is used to adjust the pH value of the complex solution to 6.6, and filtered and washed to obtain pure yttrium sulfate solution and aluminum slag. The precipitation rate of aluminum in this process is 99.1wt.%. The precipitation rate of yttrium was 1.79 wt.%. Continue to add sodium hydroxide precipitant to the yttrium sulfate solution, control the pH of the precipitation end point to 9.0, filter and wash to obtain the yttrium hydroxide precipitate and filtrate, and the precipitation rate of yttrium is 99.2wt.%.

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Abstract

The invention discloses a method for separating rare earth from aluminum by complexation. One or more of acetic acid, methoxyacetic acid, amino acetic acid, triamino acetic acid, methyl acetic acid and hydroxyacetic acid are added as complexing agents into a solution containing the rare earth and aluminum, and the adding amount of the complexing agents is controlled; aluminum impurities are settled and separated out by adjusting the pH value of the complexing solution to 5.6-6.6; filtering and washing are conducted to obtain a pure rare earth solution and aluminum slag; and a sodium hydroxideprecipitator is added to the rare earth solution, the pH value of a precipitation end point is controlled to be 9.0-12.0, and a rare earth hydroxide precipitate is obtained. Addition of the complex can preferentially conduct complexation of the rare earth in the solution containing the rare earth and aluminum, precipitation of the rare earth hydroxide and aluminum hydroxide is not influenced, andtherefore difference of the precipitation pH value between the aluminum hydroxide and rare earth hydroxide is enlarged, and efficient separation of rare earth from aluminum is realized.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for complexing and separating rare earth and aluminum. Background technique [0002] Due to their unique 4f sublayer electronic structure, large atomic magnetic moment, strong spin-orbit coupling, and variable coordination numbers, the compounds formed by rare earth elements have very rich magnetic, optical, electrical, and catalytic properties. Functional properties, known as "the vitamin of modern industry" and "treasure house of new materials". In the process of rare earth hydrometallurgy, the separation of rare earth and aluminum is often encountered; for example, in the extraction process of ion-adsorption rare earth ore, the rare earth leachate contains a certain amount of aluminum ions, and the presence of aluminum ions will increase the precipitation of the precipitant. consumption and reduce the purity of the product, so ammonium bicarbonate should be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B59/00
CPCC22B3/44C22B59/00Y02P10/20
Inventor 肖燕飞邱江徐志峰李金辉张乾
Owner GANZHOU ZHANHAI IND & TRADING
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