Cerium Separation from Light Rare Earth Concentrate by Liquid-Liquid Extraction - World Journal of Engineering and Technology

WJET > Vol.4 No.3, October 2016

World Journal of Engineering and Technology

Volume 4, Issue 3 (October 2016)

ISSN Print: 2331-4222 ISSN Online: 2331-4249

Google-based Impact Factor: 1.03 Citations

Cerium Separation from Light Rare Earth Concentrate by Liquid-Liquid Extraction ()

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Download as PDF (Size: 293KB) PP. 129-137

DOI: 10.4236/wjet.2016.43D016 1,906 Downloads 4,398 Views Citations

Author(s)

Thiago Silveira Formiga, Carlos Antonio de Morais^*

Affiliation(s)

Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, Brazil.

ABSTRACT

This work presents an investigation of solvent extraction parameters in order to obtain high purity cerium from a mixture containing other rare earths elements, as an alternative to oxidation and selective precipitation or dissolution. The study was carried out using a sample of sulfuric liquor obtained from the leaching of monazite rich in light rare earth elements (La, Ce, Pr, Nd) provided by INB (Indústrias Nucleares do Brasil S.A.). Experiments were carried out in chloridric, nitric and sulfuric media. The nitric and hydrochloric solutions were prepared by precipitation of the REE from the sulfuric liquor as rare earths oxalate, calcining the precipitate and dissolving it with nitric or hydrochloric acid. The separation of cerium was investigated in its trivalent and tetravalent forms. The parameters investigated were: type and concentration of extractant, type and amount of the oxidizing agent, liquor acidity, and volumetric ratio between organic and aqueous phases. The preference of the organic phase to extract cerium in its oxidized form (IV) over the other rare earths elements was confirmed, allowing the obtainment of a high purity cerium solution. The best results were achieved in nitric medium, with cerium in its tetravalent form, using cationic extractants (P507 or D2EHPA) and a mixture of potassium persulfate and silver chloride as oxidizing agents, yielding over 99% of cerium extraction with over 99% of purity.

KEYWORDS

Cerium, Cerium Extraction, Cerium Oxidation, Rare Earths Elements

Share and Cite:

Formiga, T. and Antonio de Morais, C. (2016) Cerium Separation from Light Rare Earth Concentrate by Liquid-Liquid Extraction. World Journal of Engineering and Technology, 4, 129-137. doi: 10.4236/wjet.2016.43D016.

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[6]	Recovery and Recycling of Cerium from Primary and Secondary Resources-a Critical Review
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[7]	The separation of light lanthanoids through pertraction
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