Study on the Extraction and Separation of Samarium from Chloride Medium Using D2EHPA and [P 66614 ][D2EHP] and Their App
- PDF / 1,159,432 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 23 Downloads / 178 Views
ORIGINAL ARTICLE
Study on the Extraction and Separation of Samarium from Chloride Medium Using D2EHPA and [P66614][D2EHP] and Their Application to Monazite Ore Bibhuti Bhusan Mishra1 • Niharbala Devi1
Received: 15 April 2020 / Accepted: 26 June 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract The present work deals with the investigation of solvent extraction of Sm(III) from chloride medium using di-(2-ethylhexyl)phosphoric acid (D2EHPA) and trihexyl tetradecyl phosphonium bis(2-ethylhexyl)phosphate ([P66614][D2EHP]) as extractants. In the extraction stage, the effect of contact time, aqueous phase pH, extractant concentration, NaCl concentration, temperature effect, stripping and O:A ratio variation are investigated to compare the extraction abilities of D2EHPA and the ionic liquid made from that. The complex formation ability and extraction mechanism of samarium with two extractants are explained by FTIR spectra and slope analysis method. Solvent extraction of samarium is better noticeable with D2EHPA than that of [P66614][D2EHP]. It is evident that with rise in pH of the aqueous medium, the extraction percentage of samarium is increased for both the extractants. Optimum extraction (100%) of Sm3? is obtained with 0.1 mol/L D2EHPA and 0.1 mol/L [P66614][D2EHP], respectively. HNO3 is the best stripping agent for backextraction of samarium from the loaded extractants. Separation studies are carried out in the presence of transition metal ions (mostly present in magnets) to know the efficiency of D2EHPA and ionic liquid [P66614][D2EHP]. The extraction studies with mixture of other rare earth metal ions similar to monazite composition follow the order as Gd(III) [ Sm(III) [ Nd(III) [ Ce(III) [ La(III) for both the extractants. Using 0.03 mol/L D2EHPA,
& Niharbala Devi [email protected] 1
Department of Chemistry, Institute of Technical Education and Research, Siksha ‘O’Anusandhan [Deemed to be University], Bhubaneswar, Odisha 751030, India
complete separation of Gd and Sm from the rare earth mixtures is found at two stages with O:A ratio of unity. Keywords Samarium Extraction Separation D2EHPA [P66614][D2EHP]
1 Introduction The rare earth elements (REEs) including samarium have secured a substantial attention in the last few decades owing to their unique properties and large-scale applications in many high-tech industries [1, 2]. The REEs are chemically indistinguishable from one another, and they invariably occur together in the source minerals such as bastnaesite, monazite and xenotime [3]. They have been used in agriculture, electronics, nuclear medicines and automobile industry [4]. In nuclear application, samarium is used as a nuclear reactor because of its high neutron absorbing tendency [5]. Due to excessive coercive force and high temperature resistance, SmCo magnets consider them more satisfactory for the distinct applications like aero-engine [6]. Apart from industrial applications, samarium is used first of all in microelectronics as dopant [7]. Hence to have samarium in the pure for
Data Loading...
