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Extraction system, extraction method and reextraction method

An extraction and system technology, applied in the direction of recycling materials, improving process efficiency, etc., can solve the problems of poor separation of heavy rare earths, easy emulsification, and low purity of extractants

Active Publication Date: 2014-04-16
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the poor separation of heavy rare earths in the existing extraction of rare earths, the need to separate rare earths at higher acidity, low purity of extractant, low saturation capacity and easy emulsification, etc. Defects provide an extraction system, extraction method and stripping method

Method used

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  • Extraction system, extraction method and reextraction method
  • Extraction system, extraction method and reextraction method

Examples

Experimental program
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Embodiment 1

[0045] The molar concentration of extractant P227 in benzene is 0.2mol / L, wherein, the pH value in the aqueous phase containing rare earth ions is 2.5, the molar concentration of rare earth ions in water is 0.01mol / L, and the salting-out agent is sodium chloride, The molar concentration is 1mol / L, the ratio of the organic phase to the aqueous phase is 2:1, and the shaking time is 20min. After oscillating and equilibrating the phase separation, analyze the concentration of rare earth ions in the aqueous phase or back-extracted organic phase. The extraction data are shown in Table 1. Among them, the average separation coefficient is 3.16, which is much higher than the reported data, and its four-group effect is as follows: figure 1 As shown, the so-called four-group effect is: La, Ce, Pr, Nd are the first group; Sm, Eu, Gd are the second group; Gd, Tb, Dy, Ho are the third group; Y, Er, Tm, Yb and Lu belong to the fourth group, and Gd is a common element of the second group and...

Embodiment 2

[0050] The molar concentration of the sodium salt of extractant P227 in kerosene is 0.2mol / L, wherein, the pH value in the water phase containing rare earth ions is 2.5, the molar concentration of rare earth ions in the water phase is 0.01mol / L, and the salting-out agent is Sodium chloride, its molar concentration is 1mol / L, the ratio of organic phase to water phase is 2:1, and the shaking time is 20min. After oscillating and balancing phase separation, the concentration of rare earth ions in the aqueous phase or back-extracted organic phase was analyzed. The extraction data was the same as that of the experiment done in Example 1. The data are shown in Table 1. It can be seen that the results of saponification of the extractant are basically consistent with the experimental data without saponification, which provides a certain reference for industrial applications.

Embodiment 3

[0052] The molar concentration of extractant P227 in n-dodecane is 0.5mol / L, wherein, the pH value in the aqueous phase containing rare earth ions is 2.8, the molar concentration of rare earth ions in the aqueous phase is 0.01mol / L, and the salting-out agent is Sodium chloride, its molar concentration is 1mol / L, the ratio of the organic phase to the aqueous phase is 1:1, and the shaking time is 30min. After oscillating and equilibrating the phase separation, analyze the concentration of rare earth ions in the aqueous phase or back-extracted organic phase. The extraction data are shown in Table 2. Among them, the average separation coefficient is 3.32, which is much higher than the reported data, and its four-group effect is as follows: figure 1 As shown, the so-called four-group effect is: La, Ce, Pr, Nd are the first group; Sm, Eu, Gd are the second group; Gd, Tb, Dy, Ho are the third group; Y, Er, Tm, Yb and Lu belong to the fourth group, and Gd is a common element of the s...

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Abstract

The invention discloses an extraction system, an extraction method and a reextraction method. The extraction system disclosed in the invention comprises an organic phase and an aqueous phase, wherein the organic phase comprises a diluent and an extraction agent shown as a formula I; the aqueous phase comprises rare earth ions; the pH value in the aqueous phase is 2.5-4.5; M is hydrogen, alkali metal ions or positive ammonium ions. The extraction method disclosed in the invention comprises the following steps: oscillating and balancing the extraction system. The reextraction method disclosed in the invention comprises the following steps: (1) saponifying the organic phase of the extraction system, mixing with the aqueous phase containing the rare earth ions, and obtaining an organic phase loaded with the rare earth ions; and (2) mixing the organic phase loaded with the rare earth ions with an aqueous solution of acid. According to the extraction system, the rare earth ions can be efficiently separated under low acidity, the extraction system is high in saturation capacity and difficult in emulsification, realizes reextraction of the rare earth ions under low acidity and is suitable for actual production.

Description

technical field [0001] The invention relates to an extraction system, an extraction method and a stripping method. Background technique [0002] Rare earth elements have rich and unique magnetic, optical, and electrical properties due to their unique 4f sublayer electronic structure. They are indispensable or substitute strategic materials for the development of high-tech and cutting-edge defense technologies and the transformation of traditional industries in various countries in the world today. Known as "the vitamin of modern industry" and "treasure house of new materials". With the continuous expansion of the application range of rare earths in high-tech fields, the demand for rare earth materials has grown rapidly. The consumption of rare earth resources is too fast, the production process is seriously polluted, and the efficient and sustainable use of resources has become a serious problem that must be solved. [0003] The extractants currently used are roughly divid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B59/00
CPCY02P10/234Y02P10/20
Inventor 肖吉昌杜若冰张燕辉陆人杰
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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