Separation and continuous determination of the light rare earth elements and thorium in Baotou Iron Ore by a micro-column

摘要

A method for continuous determination of the light rare earth elements (LREEs) and thorium in Baotou Iron Ore was established. The light rare earths and thorium were adsorbed on a micro-column packed with HD-8 cation exchange resins. The light rare earth elements were eluted with 4 mol L~(-1) HCl-2 mol L~(-1) NH_4Cl solution and determined with tribromo-arsenzao by a 721-E spectrophotometry at 630 nm; thorium was eluted with 5% potassium oxalate solution and determined with Arsenazo III by a 721-E spectrophotometry at 660 nm. The measured values by the proposed method were in close agreement with the certified values (Baotou main ore standard sample, Baotou ore R-715 standard sample and GSD-2 standard sample). The RSD of the light rare earths and thorium in Baotou Iron Ore were of <1.70% and <1.99%, respectively.