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Extracting agent, extraction system and application

An extraction agent and extraction technology, applied in the direction of improving process efficiency, etc., can solve the problems of poor separation ability of heavy rare earth elements, poor extraction and stripping performance, easy emulsification cost, etc., to help protect the environment and save the amount of acid and alkali , the effect of reducing pollutant emissions

Inactive Publication Date: 2015-12-23
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome that the existing P507-P204 extraction system cannot effectively solve the poor separation ability of heavy rare earth elements in the P507 extraction system, and as the acidity increases, the extraction ability of rare earth elements decreases. Must go through saponification treatment, serious pollution, poor extraction and stripping performance, easy emulsification and high cost of P507-C272 extraction system and other technical problems, and provide an extraction agent, extraction system and application

Method used

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  • Extracting agent, extraction system and application
  • Extracting agent, extraction system and application
  • Extracting agent, extraction system and application

Examples

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preparation example Construction

[0043] The water phase refers to the water phase containing rare earth ions, wherein, the preparation method of the water phase containing rare earth ions includes the following steps: mixing the rare earth oxide with concentrated hydrochloric acid, and adding a salting-out agent (generally sodium chloride) , and then diluted to the desired concentration. Among them, the rare earth ions are all +3 valence. The pH of the aqueous phase is between 1.0-3.0. Wherein, the molar concentration of the salting-out agent in the water phase is generally 0.5mol / L-2.0mol / L.

[0044] The extraction system including organic phase and aqueous phase is referred to as P507-P227 extraction system. The distribution ratio D is the rare earth content in the equilibrium organic phase and the rare earth content in the equilibrium water phase after an extraction is completed (the rare earth content in the water phase is measured by inductively coupled plasma optical emission spectrometry (ICP-OES), a...

Embodiment 1

[0053] Extraction and Separation of Rare Earth Elements by P507-P227 Extraction System

[0054] Organic phase: 0.50mol / LP507 and P227(n P507 :n P227 =1:1) n-dodecane solution

[0055] Water phase: 1.0M NaCl solution containing 0.01mol / L single rare earth ion, pH=3.0, that is, the water phase contains rare earth ion and salting-out agent NaCl, wherein the molar concentration of rare-earth ion is 0.01mol / L, salting-out agent NaCl The molar concentration is 1.0mol / L, and the pH value of the aqueous phase is 3.0.

[0056] Compared to (O:A)=1:1(5mL:5mL)

[0057] The organic phase was mixed with the aqueous phase, and shaken and equilibrated at 25°C for 30min. The extraction data of rare earth elements by the P507-P227 extraction system is shown in Table 1 below. It can be seen from the data in Table 1 that the average separation coefficient of the P507-P227 extraction system for rare earth elements is 2.55, which can effectively separate adjacent rare earth elements; heavy rar...

Embodiment 2

[0061] Extraction and Separation of Rare Earth Elements by P507-P227 Extraction System

[0062] Organic phase: 0.50mol / LP507 and P227(n P507 :n P227 =1:1) kerosene solution

[0063] Water phase: 1.0M NaCl solution containing 0.01mol / L single rare earth ion, pH=3.0

[0064] Compared to (O:A)=1:1(5mL:5mL)

[0065] The organic phase was mixed with the aqueous phase, and shaken and equilibrated at 25°C for 30min. The extraction data of the rare earth elements by the P507-P227 extraction system is equivalent to that of Example 1. Among them, the average separation coefficient of P507-P227 extraction system for rare earth elements is 2.45, which can effectively separate adjacent rare earth elements; the average separation between heavy rare earth elements Tb, Dy, Ho, Er, Tm, Yb, Lu and Y The coefficient is 2.43.

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Abstract

The invention discloses an extracting agent, an extraction system and an application. The extracting agent comprises 2-ethylhexyl phosphonic acid mono-ethylhexyl ester and di-(2-ethylhexyl) phosphinic acid. The extraction system comprises an organic phase and a water phase, wherein the organic phase comprises a diluent and the extracting agent; the water phase comprises rear-earth ions; and the pH value of the water phase is 1.0-3.0. The extraction system disclosed by the invention can effectively improve extraction and reverse extraction performances of a P507 extraction system, is good in separating capacity on heavy rear-earth elements, capable of carrying out extraction and reverse extraction under relatively low acidity and reducing dosage of acid and alkali, more green and environmentally-friendly, low in cost, high in saturation capacity, free of an emulsion phenomenon and more suitable for practical industrial production.

Description

technical field [0001] The invention relates to an extractant, an extraction system and its application. Background technique [0002] Rare earth compounds play an important role in national defense, environment, biology, catalysis, metallurgy and other industries, and play an irreplaceable role in the field of modern science and technology. With the increasing application of rare earths and the improvement of the quality requirements of rare earth products, higher requirements are put forward for the purity of rare earths. Among the rare earth elements, 15 lanthanide elements occupy a place in the periodic table. Yttrium and lanthanide elements are symbiotic and have similar properties to holmium and erbium, so they are also called rare earth elements. Their physical and chemical properties are very similar, and it is difficult to separate pure single rare earth compounds. [0003] At present, solvent extraction technology is applied to the separation and purification of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/40
CPCY02P10/20
Inventor 肖吉昌杜若冰安华英陆人杰张婷殷武涛张素辉
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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