Study on a recovery of rare earth oxides from a LiCl–KCl–RECl3 system

Reaction of Oxygen with Solutions of Neodymium Chloride in Alkali Chloride Melts: A Spectroscopy and Kinetics Study

“…14 Studies performed on the melts containing mixtures of rare earth chlorides 12,13 showed that LnOCl (Ln = La, Pr, Nd, Eu, Gd), CeO 2 and PrO 2 were formed. The behavior of solutions of cerium, praseodymium, neodymium and gadolinium chlorides in 3LiCl-2KCl based melts in the presence of oxygen was also considered by Eun et al 15 The authors 15 reported that bubbling oxygen through the melt resulted in conversion of dissolved CeCl 3 to CeOCl at 450 °C, and praseodymium, neodymium and gadolinium chlorides into the corresponding oxychlorides at 650 °C. To convert the oxychlorides to oxides the temperature had to be risen above 1100 °C.…”

Cerium and neodymium co-precipitation in molten chloride by wet argon sparging

“…The results reported on cerium and neodymium indicate a precipitation of these elements as oxychlorides, CeOCl by using Na 2 CO 3 or BaO [5] and NdOCl with O 2 [9,10]. With oxygen sparging precipitation, cerium precipitates as CeO 2 [11,7,8]. Cho et al [12,13] present the co-precipitation of several rare-earth elements by oxygen sparging.…”

“…This is generally performed by adding oxo-donor solids like alkaline or alkaline-earth oxides or carbonates [5,6] or by oxobasic gases sparging [7]. The first method is not convenient because of the increasing quantity and the changing composition of the molten salt.…”

Promising Method of Sm–Co Magnet Reprocessing in Alkali Chloride Melts

“…Recently, ionic melts of molten chlorides have become an attractive reaction medium in many fields including nuclear energy, metallurgy, clean synthesis, catalytic processes, and thermal energy storage. − According to several studies, rare earth elements can be precipitated from various molten salts using different precipitants such as alkali phosphates , and oxides. , One advantage of gaseous oxygen or oxygen compounds is that they do not introduce any additional metallic cations into the melt. Several studies have been published recently concerning the reaction of oxygen within the 3LiCl–2KCl eutectic melt containing rare earth chlorides. − It has been shown that bubbling oxygen through solutions of LnCl 3 in the chloride melt at 450–750 °C resulted in the formation of LnOCl (Ln = La, Pr, Nd, Eu, and Gd), CeO 2 , and PrO 2 . However, there are currently no studies regarding samarium and cobalt behaviors in molten chloride salts during oxygenation.…”