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Solvent Extraction of Lanthanum Ion from Chloride Medium by Di-(2-ethylhexyl) Phosphoric Acid with a Complexing Method
School of Materials and Metallurgy, Northeastern University, Shenyang, China
School of Materials and Metallurgy, Northeastern University, Shenyang, China
School of Materials and Metallurgy, Northeastern University, Shenyang, China
School of Materials and Metallurgy, Northeastern University, Shenyang, China
School of Materials and Metallurgy, Northeastern University, Shenyang, China
- 1 School of Materials and Metallurgy, Northeastern University, Shenyang, China
- 2 School of Materials and Metallurgy, Northeastern University, Shenyang, China
- 3 School of Materials and Metallurgy, Northeastern University, Shenyang, China
- 4 School of Materials and Metallurgy, Northeastern University, Shenyang, China
- 5 School of Materials and Metallurgy, Northeastern University, Shenyang, China
International Journal of Nonferrous Metallurgy·Volume 02 (2013)·Pages 75–79·Published 16 April 2013·DOI10.4236/ijnm.2013.22010
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Abstract
Solvent extraction experiments of La(III) with di-(2-ethylhexyl)phosphoric acid (P204) from chloride solution in the presence of a complexing agent (lactic acid) have been performed. The effective separation factors can be achieved when the complexing agent is added to the aqueous phase of the extraction system. The complexing agent lactic acid can be effectively recycled using tributyl phosphate (TBP) as extractant, by the use of a countercurrent extraction proc ess, and the chemical oxygen demand (COD) value in the raffinate is 57.7 mg/L, which meets the emission standards of pollutants from rare earths industry. Thus, the simple and environment-friendly complexing method has been proved to be an effective strategy for separating light rare earths, and provides a positive influence on the purification of La(III).
KeywordsLa(III)Extraction and SeparationP204 ExtractantLactic AcidTBP
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