Shahrood University of Technology Journal of Mining and Environment 2251-8592 7 2 2016 07 01 Investigation of performances of solvents D2EHPA, Cyanex272, and their mixture system in separation of some rare earth elements from a Nitric Acid solution 143 148 476 10.22044/jme.2016.476 EN Seyyed M. Seyyed Alizadeh Ganji School of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran S. Z. Shafaie School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran N. Goudarzi Faculty of Chemistry, Shahrood University of Technology, Shahrood, Iran Journal Article 2015 02 08 <span>This work was aimed to evaluate and compare the performances of the solvents D2EHPA (Di-(2-ethylhexyl) phosphoric acid), Cyanex 272 </span><span>(bis (2,4,4-trimethylpentyl) phosphinic acid), </span><span>and a mixture system of D2EHPA and Cyanex272 in the separation of some rare earth elements </span><span>(REEs)</span><span> including lanthanum, gadolinium, neodymium, and dyspersym from a nitric acid solution. The results obtained showed that Cyane272 had the lowest separation factor in the separation of Dy, La, Nd, and Gd from each other. Also it was found that a mixture system of D2EHPA and Cyanex272 had the best performance in the separation of the investigated </span><span>REEs,</span><span> owing to the higher separation factors for Dy/Nd and Dy/Gd, as well as the lower extraction efficiencies for Gd (64.54%), La (30.07%), and Nd (26.47) from Dy (99.92). It was also determined that the separation factors for</span><span>Dy/Nd and Dy/Gd were 720.05 and 3640.27, respectively, using their mixture system.</span> https://jme.shahroodut.ac.ir/article_476_88a8213e8d75c01f101765522bc18022.pdf