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Method for reducing the amount of acid used in the extraction and separation of medium and heavy rare earths

A heavy rare earth, extraction technology, applied in the direction of improving process efficiency and so on

Active Publication Date: 2021-06-08
BAOTOU RES INST OF RARE EARTHS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not perform impurity removal treatment on the rare earth chloride solution, and a large amount of acid solution is required in the washing section and stripping section

Method used

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  • Method for reducing the amount of acid used in the extraction and separation of medium and heavy rare earths
  • Method for reducing the amount of acid used in the extraction and separation of medium and heavy rare earths

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The (TbDy)Cl obtained by extracting and separating 3 The solution (the concentration of organic impurities is 30 mg / L, the concentration of hydrogen ions is 0.4 mol / L, and the concentration of rare earth chlorides is 1.2 mol / L) is formed by filling styrene-divinylbenzene at a flow rate of 50 L / h at room temperature The resin column of the cross-linked polymer (the diameter of the resin column is 0.3 meters, and the height is 3 meters), obtains (TbDy)Cl after impurity removal 3 solution.

[0052] The impurity-removed (TbDy)Cl 3 The solution uses ammonium bicarbonate to adjust the concentration of hydrogen ions to 0.2 mol / L, and then enters the extraction section, using 2-ethylhexyl phosphate mono-2-ethylhexyl ester as the extraction agent and kerosene as the diluent to perform terbium dysprosium extraction. Extract and raffinate are obtained. The extract is input to the washing section, and the hydrochloric acid solution with a hydrogen ion concentration of 0.1mol / L i...

Embodiment 2

[0054] The extracted and separated (Eu-Dy)Cl 3 The solution (organic impurity concentration is 29.46mg / L, hydrogen ion concentration is 0.2mol / L, rare earth chloride concentration is 1.5mol / L) is filled with styrene-divinylbenzene at a flow rate of 270L / h at room temperature. The resin column of the cross-linked polymer that forms (the diameter of resin column is 0.3 meter, and height is 3 meters), obtains (Eu-Dy)Cl after impurity removal 3 solution.

[0055] The impurity-removed (Eu-Dy)Cl 3 The solution is input to the extraction section, and 2-ethylhexyl phosphate mono-2-ethylhexyl ester is used as the extractant, and kerosene is used as the diluent to perform extraction with gadolinium and terbium to obtain an extract and a raffinate. The extract is input to the washing section, and the hydrochloric acid solution with a hydrogen ion concentration of 0.1mol / L is used as the washing liquid, and the flow rate of the washing liquid entering the washing section is 0.2L / min. T...

Embodiment 3

[0057] The extracted and separated (EuGd)Cl 3 The solution (organic impurity concentration is 10.18mg / L, hydrogen ion concentration is 0.15mol / L, rare earth chloride concentration is 1.5mol / L) is filled with styrene-divinylbenzene at a flow rate of 210L / h at room temperature. The resin column (the diameter of resin column is 0.3 meter, height is 3 meters) of the cross-linked polymer that forms, obtains the (EuGd)Cl after impurity removal 3 solution.

[0058] The impurity-removed (EuGd)Cl 3 The solution is input into the extraction section, and 2-ethylhexyl phosphate mono-2-ethylhexyl ester is used as the extractant, and kerosene is used as the diluent to perform europium-gadolinium extraction to obtain an extract and a raffinate. The extract is input to the washing section, and the hydrochloric acid solution with a hydrogen ion concentration of 0.09mol / L is used as the washing liquid, and the flow rate of the washing liquid entering the washing section is 0.3L / min. The extr...

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Abstract

The invention discloses a method for reducing the amount of acid used in the extraction and separation of medium and heavy rare earths: the solution containing medium and heavy rare earth chlorides obtained by extraction and separation is passed through a resin column filled with cross-linked polymers to obtain medium and heavy rare earth chlorides after removal of impurities. Rare earth chloride solution; the medium and heavy rare earth chloride solution after impurity removal is passed through the extraction section to obtain the extract and raffinate; the extract is sequentially passed through the washing section and the stripping section to obtain the strip raffinate; wherein, the washing section The washing liquid used is an inorganic acid solution with a hydrogen ion concentration of 0.05-0.2 mol / L, the flow rate of the washing liquid into the washing section is 0.1-0.8 L / min, and the stripping liquid used in the stripping section is a hydrogen ion concentration It is a 3-7mol / L mineral acid solution, and the flow rate of the stripping liquid into the stripping section is 1.2-3.0L / min. The method can reduce the amount of acid used in the extraction and separation process of medium and heavy rare earths, and does not affect the clarification effect of the medium and heavy rare earths in the water phase and oil phase of the washing section and the purity of the raffinate obtained by extraction and separation.

Description

technical field [0001] The invention relates to a method for reducing the amount of acid used in the extraction and separation of medium and heavy rare earths. Background technique [0002] Hydroxamic acid collectors are used in the process of flotation of rare earth concentrates. Under high temperature or strong acid, hydroxamic acid collectors will undergo rearrangement reactions to generate isocyanamides or amine organic compounds. These organic compounds will enter the rare earth chloride solution and affect the extraction and separation of rare earth. [0003] In the extraction and separation process of medium and heavy rare earths, organic impurities will enter the organic phase and water phase of extraction separation. In the washing section, due to the presence of organic impurities, only by increasing the amount of detergent acid solution can the clarification of the aqueous and organic phases be achieved. The rare earth ions carried by the organic impurities ente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/24C22B3/38
CPCC22B3/24C22B59/00C22B3/3844Y02P10/20
Inventor 马莹郝先库张瑞祥斯琴毕力格张文娟郝一凡刘海旺王士智
Owner BAOTOU RES INST OF RARE EARTHS