Studies of the Influence of the Percentage Content of Polar Organic Solvent on the Sorption and Separation of Rare Earth Elements Nitrate Complexes on Anion Exchangers

摘要

Rare earth elements do not occur individually in Nature but in the form of mixtures, which are frequently isomorphic, and in minerals but only in small amounts. Hence, their metallurgy is difficult and extremely expensive. The aim of the present work was to study the influence of the percentage content of a polar organic solvent (CH_3OH, CH_3COCH_3) on the possible selective removal and separation of rate earth elements(III) nitrate complexes by frontal analysis in 95-35% v/v polar organic solvent-x% v/v H_2O-5-10% v/v 1 or 7 M HNO_3 systems on the strongly basic anion exchangers Wofatit SBW * 6% DVB and Wofatit SBK * 7% DVB. The weight and bed distribution coefficients, as well as the number of theoretical plates for individual systems, were determined. The best results were obtained in the 95% v/v CH_3COCH-5% v/v 7 M HNO_3 system on Wofatit SBW * 6% DVB. In this case, 2.62 kg Y_2O_3 were purified from a 1% neodymium admixture on 1 dm~3 of the anion exchanger.