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Application of N, N-dialkyl amide carboxylic acid compound and method

A technology of dialkylamide carboxylic acid and compound, which is applied in the application field of N,N-dialkylamide carboxylic acid compounds, can solve the problems of poor aluminum removal effect and easy emulsification of the organic phase, and achieve low cost and separation The effect of high coefficient and high selectivity

Active Publication Date: 2021-11-02
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Although various methods are used to optimize the naphthenic acid extraction and separation system in the prior art, there is still aluminum removal effect in the existing naphthenic acid extraction and separation Poor, the organic phase is easy to emulsify during the extraction process, etc.

Method used

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  • Application of N, N-dialkyl amide carboxylic acid compound and method
  • Application of N, N-dialkyl amide carboxylic acid compound and method
  • Application of N, N-dialkyl amide carboxylic acid compound and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The extractant provided in this example is N,N-diethylamide butyric acid, ie R 1 and R 2 Be ethyl, n=2, structural formula is as follows:

[0044]

[0045] The following process was used to separate iron and aluminum in solution:

[0046] (1) Prepare the organic phase. Mix 20mL N,N-diethylamide butyric acid extractant with 80mL toluene diluent to form 100mL organic phase. The volume ratio of extractant to diluent is 1:4.

[0047] (2) Extraction process: take 100 mL of rare earth solution containing aluminum and iron elements, mix it with the organic phase, slowly add 6.0 mol / L sodium hydroxide solution, and perform extraction. The extraction time is 30 minutes. The volume ratio of rare earth feed liquid to liquid caustic soda is 25:4. The total concentration of rare earth elements is 1.85mol / L, and the concentration of aluminum elements is 4.025g / L (as Al 2 o 3 Calculation), the concentration of iron element is 0.45g / L (as Fe 2 o 3 calculate). The volume r...

Embodiment 2

[0051] The extractant is N,N-di-n-octylamide butyric acid, ie R 1 and R 2 Be n-octyl, n=2, structural formula is as follows:

[0052]

[0053] The following process was used to separate iron and aluminum in solution:

[0054] (1) Prepare the organic phase. Mix 50mL N,N-di-n-octylamide butyric acid extractant with 50mL aviation kerosene diluent to form 100mL organic phase. The volume ratio of extractant to diluent is 1:1.

[0055] (2) Extraction process: take 10 mL of rare earth solution containing aluminum and iron elements, mix it with the organic phase, slowly add 0.5 mol / L sodium hydroxide solution, and perform extraction. The extraction time is 30 minutes. The volume ratio of rare earth feed liquid to liquid caustic soda is 5:1. The total concentration of rare earth elements is 0.3mol / L, and the concentration of aluminum elements is 4.025g / L (as Al 2 o 3 Calculation), the concentration of iron element is 0.45g / L (as Fe 2 o 3 calculate). The volume ratio of th...

Embodiment 3

[0059] The extractant is N,N-dicyclopentylamide butyric acid, ie R 1 and R 2 Both are cyclopentyl, n=2, the structural formula is as follows, the source of the extractant is self-made, and the purity and yield are both greater than 98%.

[0060]

[0061] The following process was used to separate iron and aluminum in solution:

[0062] (1) Prepare the organic phase. Mix 1mL extractant with 9mL toluene diluent to form 10mL organic phase. The volume ratio of extractant to diluent is 1:9.

[0063] (2) Extraction process: take 100 mL of rare earth solution containing aluminum and iron elements, mix it with the organic phase, and slowly add 8 mol / L sodium hydroxide solution for extraction. The extraction time is 30 minutes. The volume ratio of rare earth feed liquid to liquid caustic soda is 10:1. The total concentration of rare earth elements is 2mol / L, and the concentration of aluminum elements is 4.025g / L (as Al 2 o 3 Calculation), the concentration of iron element is...

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Abstract

The invention relates to an application of an N, N-dialkyl amide carboxylic acid compound and a method. In the structural formula of the N, N-dialkyl amide carboxylic acid compound, R1 and R2 are respectively independent C1-C9 alkyl groups, and n is a natural number from 1 to 6. The method comprises the following steps that a diluent containing the N, N-dialkyl amide carboxylic acid compound is mixed with a rare earth solution containing aluminum and / or iron, and then alkali liquor is added for extraction. The N, N-dialkyl amide carboxylic acid compound is used as an extraction agent to separate iron and / or aluminum in the rare earth solution and has the good removal effect on aluminum and iron in the solution, and an organic phase is not emulsified in the extraction process.

Description

technical field [0001] The invention relates to the field of metal separation and purification, in particular to the application and method of an N,N-dialkylamide carboxylic acid compound. Background technique [0002] At present, the main method for extracting and removing aluminum and iron from rare earth feed liquid is naphthenic acid extraction. [0003] For example, CN101979680A discloses a method for removing aluminum from rare earth material liquid, which belongs to the treatment technology of rare earth material liquid, and aims to provide a method with good aluminum removal effect, low aluminum removal cost, high rare earth recovery rate, convenient operation and control, and simple process. A method for removing aluminum from a rare earth feed solution with less investment in equipment, the key points of the technical scheme include the following steps: (1) prepare an organic phase by volume ratio of 15-25% naphthenic acid-15-25% alcohol-kerosene; (2) Add the orga...

Claims

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Application Information

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IPC IPC(8): C22B3/32C22B59/00B01D11/04
CPCC22B59/00B01D11/04Y02P10/20
Inventor 王艳良杨少波李来超赵德森郑仙荣
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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