Method for using magnetic polymeric microsphere to separate rare earth ions

A technology of rare earth ions and polymers, applied in the direction of improving process efficiency, etc., can solve the problems of slow mass transfer in pores, unsuitable for separating large-volume rare earth ion solutions, and small adsorption capacity, and achieve broad practical application prospects and simple Convenient separation and recovery, large specific surface area

Active Publication Date: 2014-10-29
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
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Problems solved by technology

However, the solvent extraction method for extracting low-concentration rare earth ions has disadvantages such as high cost, loss of extractant, and secondary pollution; the ion exchange method has disadvantages such as small adsorption capacity, slow mas

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  • Method for using magnetic polymeric microsphere to separate rare earth ions

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Embodiment 1

[0019] (1) The prepared particle size is 20 μm, and the Fe-coated 3 O 4 The magnetic polymethyl acrylate (PMA) microspheres (the particle size is less than 8nm, the mass percentage is 20%) were washed twice with N,N-dimethylformamide (DMF), and then 3 g of the microspheres were weighed and added to the In the mixed solution of diamine (EDA) and N,N-dimethylformamide (DMF), the mixture was shaken and shaken, and the reaction was stirred at a constant temperature of 80°C for 8h. After cooling, magnetic separation and washing were performed to obtain magnetic PMA microspheres with surface amination.

[0020] (2) Prepare an aqueous solution of lanthanum nitrate with a concentration of 50 mg / L in a 2000 mL beaker, and adjust its pH to 3.0 with 2 mol / L hydrochloric acid. Weigh the magnetic PMA microspheres with a mass of 2 g surface amination and add 1000 mL La 3+ In the aqueous solution, the adsorption reaction was carried out for 15 min at a temperature of 5 °C and a stirring s...

Embodiment 2

[0023] (1) The prepared particle size is 80 μm, coated with CoFe 2 o 4 (particle diameter is less than 50nm, mass percentage is 10%) the magnetic polymethyl methacrylate (PMMA) microsphere is washed 2 times with DMF earlier, then takes by weighing 10g magnetic microspheres and adds in the mixed solution of EDA and DMF, shakes Shake well and stir the reaction at 80°C for 8h. After cooling, magnetically separate and wash to obtain surface-aminated magnetic PMMA microspheres. Weigh 5 g of the aforementioned magnetic PMMA microspheres grafted with dendritic amino groups on the surface. Added to 16g carbon disulfide (CS 2 ) and 30 mL of 6% sodium hydroxide (NaOH) mixed solution, stirred at room temperature (24° C.) for 2 h, and then continued to react at 45° C. for 4 h. After the reaction, the magnetic PMMA microspheres with dithiocarbamic acid groups connected on the surface are obtained through magnetic separation and washing.

[0024] (2) Take by weighing the magnetic PMMA ...

Embodiment 3

[0027] (1) The prepared particle size is 120 μm, coated with γ-Fe 2 o 3 (particle diameter is less than 30nm, mass percentage is 18%) the magnetic polystyrene-hydroxyethyl methacrylate (P(St-HEMA)) microsphere is washed 2 times with deionized water earlier, then takes by weighing 10g magnetic microsphere Add in 20mL thionyl chloride (SOCl 2 ), react at a constant temperature of 80°C for 8 hours, then add 30 mL of absolute ethanol dissolved with 8 g of sodium p-nitrophenylazosalicylate (AY), and continue the reaction for 24 hours. After cooling, the magnetic P(St-HEMA) microspheres containing AY groups on the surface are obtained by magnetic separation and washing.

[0028] (2) Weigh 2g of magnetic P(St-HEMA) microspheres containing AY groups on the surface in a 5000mL beaker, then add 1200mL of 420mg / L neodymium ion aqueous solution, and adjust its pH with 2mol / L hydrochloric acid The value is 3.5, and the adsorption reaction is carried out for 15 minutes at a temperature o...

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Abstract

The invention relates to a method for using a magnetic polymeric microsphere to separate rare earth ions. The method mainly comprises the following steps: preparing the magnetic polymeric microsphere with superparamagnetism, modifying the surface of the microsphere with functional groups capable of forming chelates with rare earth ions, so as to use the microsphere to separate rare earth ions in a water solution; and desorbing and recovering rare earth ions supported by the surface of the magnetic polymeric microsphere. The innovative point of the method is applying the magnetic polymeric microsphere to separation and enrichment of low-concentration rare earth ions. The method is simple and convenient in operational process and fast in separation speed, and the magnetic polymeric microsphere is large in adsorption capacity on rare earth ions and high in adsorption efficiency.

Description

technical field [0001] The invention relates to a method for separating rare earth ions by magnetic polymer microspheres. Background technique [0002] my country is rich in rare earth resources. It is not only a big country in rare earth resources, but also has become the world's largest rare earth producer, rare earth exporter and rare earth consumer. Over the years, my country's rare earth science and technology workers have developed a series of mining, beneficiation and smelting technologies that are at the world's advanced level in combination with the characteristics of domestic rare earth resources, and have established a complete rare earth industry system. At present, the widely used rare earth element separation methods mainly include solvent extraction separation method, ion exchange separation method and so on. However, the solvent extraction method to extract low-concentration rare earth ions has disadvantages such as high cost, loss of extractant and secondar...

Claims

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Application Information

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IPC IPC(8): C22B3/24C22B59/00
CPCY02P10/20
Inventor 王强崔大立黄小卫龙志奇徐旸
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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