Method for extracting and separating light rare earth element

A light rare earth element, extraction technology, applied in chemical instruments and methods, preparation/processing of rare earth metal compounds, rare earth metal chlorides, etc., to achieve acceptable efficiency, simple device size, and reduced installation investment and operating costs. Effect

Inactive Publication Date: 2013-01-02
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since diglycol amic acid has different chemical properties from the commercially available extractants D2EHPA, PC-88A and Cyanex 272, the extraction process must be further improved before extraction can be performed at industrially acceptable levels

Method used

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  • Method for extracting and separating light rare earth element
  • Method for extracting and separating light rare earth element
  • Method for extracting and separating light rare earth element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This example uses as figure 1 Shown is a countercurrent multistage mixer-settler comprising several sections and fluid lines, with D2EHDGAA used as the extractant to sequentially extract and separate neodymium, praseodymium, and cerium from a mixture of lanthanum, cerium, zirconium, and neodymium.

[0069] The organic phase is a 0.5mol / L kerosene solution of D2EHDGAA. The aqueous phase is 30L lanthanum: cerium: aluminum: the mol ratio of neodymium=1:1:1:1 and the concentration of lanthanum+cerium+praseodymium+neodymium is 0.1mol / L lanthanum chloride, cerium chloride, praseodymium chloride and An aqueous solution of neodymium chloride.

[0070] figure 1 The countercurrent multistage mixer-settler shown in includes 14 stages of extraction part A, 10 stages of washing part B and 8 stages of stripping part C. Extraction and separation are carried out by contacting the organic phase with the aqueous phase at a temperature of 35°C lower than the flash point of kerosene. T...

Embodiment 2

[0094] This example uses as figure 1 Shown is a countercurrent multistage mixer-settler comprising several sections and fluid lines, with D2EHDGAA as extractant for the extraction and separation of neodymium from a mixture of praseodymium and neodymium.

[0095] The organic phase is a 0.5mol / L kerosene solution of D2EHDGAA. The aqueous phase is 30L praseodymium: neodymium molar ratio = 1: 1 and the concentration of praseodymium + neodymium becomes 0.1mol / L aqueous solution of praseodymium chloride and neodymium chloride.

[0096] figure 1 The countercurrent multistage mixer-settler shown in includes 12 stages of extraction part A, 12 stages of washing part B and 8 stages of stripping part C. Extraction and separation were carried out by contacting the organic phase with the aqueous phase at 35°C. The aqueous phase is supplied from the pipeline 1 with a flow rate of 15 L / hr, the organic phase is supplied from the pipeline 2 with a flow velocity of 21 L / hr, the sodium hydroxi...

Embodiment 3

[0099] The flow rate of aqueous sodium hydroxide from line 3 is 0.8 L / hr, the flow rate of aqueous hydrochloric acid from line 4 is 0.4 L / hr, and the flow rate of aqueous hydrochloric acid from line 6 is 0.7 L / hr, otherwise as Extraction and separation were carried out as in Example 2. The amount of sodium hydroxide fed from line 3 was 1.5 equivalents, and the total amount of hydrochloric acid fed from lines 4 and 6 was 1.5 equivalents relative to the LREE in the aqueous phase fed from line 1 . The concentrations of praseodymium and neodymium were determined as in Example 2. The purities of praseodymium and neodymium are also reported in Table 4.

[0100] Example 4

[0101] The flow rate of aqueous hydroxide solution from line 3 was 1.6 L / hr, the flow rate of aqueous hydrochloric acid from line 4 was 0.7 L / hr, and the flow rate of aqueous hydrochloric acid from line 6 was 1.5 L / hr, otherwise as Extraction and separation were carried out as in Example 2. The amount of sodiu...

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Abstract

A target light rare earth element is separated from an aqueous solution containing two or more of La, Ce, Pr and Nd by contacting an organic phase containing an extractant with the aqueous solution in a counter-current flow multistage mixer-settler while adding an alkaline solution thereto, and contacting the organic phase with an acid aqueous solution for back-extracting the target element. The extractant is a dialkyl diglycol amic acid having formula: R1R2NCOCH2OCH2COOH, wherein R1 and R2 are alkyl, at least one having at least 6 carbon atoms.

Description

technical field [0001] The present invention relates to a method for effectively extracting and separating target light rare earth elements from a mixture containing at least two light rare earth elements of lanthanum, cerium, praseodymium and neodymium. Background technique [0002] Today, rare earth magnets represented by Nd magnets are widely used in various motors, sensors, and other components installed in hard disk drives, air conditioners, and hybrid vehicles, among others. As for the rare earth elements for the production of rare earth magnets, their resources are only found in a limited number of countries. The resource crisis is highlighted as demand is expected to outstrip supply in the near future. There is a strong demand for the reuse of magnet powder, chips and chips related to the manufacture of rare earth magnets, the recycling of rare earth elements recovered from municipal waste, and the research and development of new rare earth deposits. [0003] The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/32C22B59/00C01F17/17C01F17/271
CPCC01F17/0006C22B58/00C22B59/00C22B3/0022Y02P10/20C01F17/271C01F17/17C22B3/26
Inventor 须原泰人榊一晃美浓轮武久
Owner SHIN ETSU CHEM CO LTD
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