Behavior of sec-octylphenoxy acetic acid (CA-12) in yttrium recovery from high concentrated heavy rare earths mixture

Corradino Sposato, Alessandro Blasi, Assunta Romanelli, Giacobbe Braccio, Massimo Morgana

Research output: Contribution to conferencePaper

Abstract

The solvent extraction technique is the only industrial way used to separate and purificate yttrium from other rare earths. In order to improve this process several extractants have been tested during last years. In this work, the behavior of sec-octylphenoxy acetic acid (CA-12) in Yttrium recovery from high concentrated heavy rare earth mixture was investigated. Sodium hydroxide solution was used in order to presaponify organic phase composed by CA-12 and Tributyl phosphate (TBP) diluted in kerosene. In the investigated condition, TBP confirmed its role of phase modifier not significantly altering the extraction behavior of CA-12. The CA-12-TBP system showed a high affinity in extraction for lighter rare earths such as Sm, Eu, and Gd, leaving yttrium in aqueous phase. Using a feed concentration (∑ [RE]) of 1M, organic mixture is capable to extract around the 70% of metals in a single extraction test showing this extraction sequence Y < Lu < Yb < Tm < Er < Ho < Dy < Tb < Gd < Eu < Sm. Moreover for [CA-12] = 1.79 M and [RE] = 2M the instability of extraction system occurs.
Original languageEnglish
DOIs
Publication statusPublished - 2017
EventInternational Symposium on Rare Metal Technology, 2017 - San Diego, United States
Duration: 1 Jan 2017 → …

Conference

ConferenceInternational Symposium on Rare Metal Technology, 2017
CountryUnited States
CitySan Diego
Period1/1/17 → …

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All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Materials Chemistry
  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Energy Engineering and Power Technology

Cite this

Sposato, C., Blasi, A., Romanelli, A., Braccio, G., & Morgana, M. (2017). Behavior of sec-octylphenoxy acetic acid (CA-12) in yttrium recovery from high concentrated heavy rare earths mixture. Paper presented at International Symposium on Rare Metal Technology, 2017, San Diego, United States. https://doi.org/10.1007/978-3-319-51085-9_24