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A method of separating and/or extracting lanthanides

A technology of lanthanide and separation coefficient, applied in the field of extraction and separation of lanthanide in water, can solve the problems of poor selectivity, narrow acid and alkali resistance range, poor separation ability of radioactive ions, etc., and achieve the effect of high selective removal

Active Publication Date: 2020-06-09
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zeolites, insoluble ferrocyanides and heteropolyacids have been used to extract and separate lanthanides, but these existing materials have the disadvantages of poor selectivity, narrow range of acid and alkali resistance, and poor ability to separate radioactive ions. hinder its further application (J.Am.Chem.Soc.2017,139(12), 4314-4317)
In particular, high-level radioactive waste liquid is highly acidic, and most water treatment agents are greatly reduced in the adsorption capacity of lanthanides under acidic conditions (J.Am.Chem.Soc.2017,139(46), 16494-16497 )

Method used

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  • A method of separating and/or extracting lanthanides
  • A method of separating and/or extracting lanthanides
  • A method of separating and/or extracting lanthanides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1 [V 3 o 7 ] n n- Preparation of layered framework materials

[0071] Mix the vanadium source, lithium hydroxide, N,N-dimethylformamide solution and water evenly in a certain molar ratio, stir thoroughly at room temperature, and put it into a stainless steel reaction kettle lined with polytetrafluoroethylene. After reacting at constant temperature for a period of time, naturally cool to room temperature, filter the obtained sample, wash with distilled water and ethanol in turn, and dry naturally to obtain [Me 2 NH 2 ] V 3 o 7 (Sample 1#). The kind of reactant, reactant ratio, reaction time, reaction temperature, productive rate are shown in Table 1 in detail.

[0072] Table 1

[0073]

[0074] Yield = (mass of obtained sample 1#) ÷ (mole number of vanadium in the vanadium source ÷ 2 x theoretical molecular weight of the product) x 100%.

[0075] The concentration of the N,N dimethylformamide solution can be adjusted as required, eg 40wt%.

Embodiment 2

[0076] Example 2 utilizes sample 1# to extract and separate the kinetic test of lanthanide elements

[0077] After grinding, the powder of sample 1# and 116.9ppm of Eu 3+ The aqueous solution of ions is mixed, and the mixture is stirred at 50° C., V (volume of solution): m (mass of exchanger) = 1000 mL / g. Take a small amount of mixture supernatant at regular intervals, and use inductively coupled plasma emission spectrometry to determine Eu 3+ ion concentration. figure 1 The picture in (a) is a photo of sample 1#; figure 1 In (b) is Eu with time 3+ Changes in ion concentration and Eu 3+ Ion removal rate graph. figure 1 (b) shows that sample 1# has a good effect on Eu 3+ The removal of ions can reach equilibrium within 2 hours.

Embodiment 3

[0078] Example 3 Utilize sample 1# to extract and separate the adsorption model test of lanthanide elements

[0079] After grinding, the powder of sample 1# was mixed with 2.2-756.2ppm Eu 3+ 、Sm 3+ The ionic water solution was mixed, and the mixture was stirred at 50° C. for 3 h, V (solution volume): m (mass of exchanger) = 1000 mL / g. After the reaction was completed, the supernatant and the starting solution were taken to measure Eu by inductively coupled plasma emission spectrometry. 3+ 、Sm 3+ concentration of ions. Experimental results such as figure 2 , figure 2 (a) and (b) respectively show the effect of sample 1# on Eu 3+ 、Sm 3+ The maximum adsorption capacity of ions can reach 161 mg / g and 135 mg / g respectively.

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Abstract

The application discloses a method for separating and / or extracting lanthanides. The method comprises the following steps of making a water treatment agent be in contact with a solution containing thelanthanides, separating and / or extracting the lanthanides by adsorption by the water treatment agent, specifically, the water treatment agent is [V3O7]n<n-1>layered framework material.

Description

technical field [0001] The invention belongs to the field of water treatment of lanthanide elements, and in particular relates to a method for efficiently and selectively extracting and separating lanthanide elements in water with a batch-synthesized water treatment agent. Background technique [0002] Energy and the environment have always been two hot issues in today's society. With the development of society, human's demand for energy is gradually increasing. However, fossil energy is non-renewable, and the process of utilization will bring many environmental problems. Nuclear energy is favored by many countries because of its high efficiency and cleanliness. However, the development of nuclear energy has brought about problems such as nuclear waste disposal. The related environmental problems caused by nuclear waste liquid have become the focus and difficulty of various countries. Radioactive ions are easily released into water and soil, causing pollution and posing a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C02F1/28C02F101/20
CPCC02F1/281C02F2101/20C22B7/006C22B59/00Y02P10/20
Inventor 孙海燕冯美玲黄小荥
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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