Simultaneous Recovery of Cerium and Fluorine from Bastnaesite leach liquor by Mixtures of Cyanex 923 and HEH(EHP)

Abstract

In this paper, studies were carried out on the extraction and recovery of cerium and fluorine by mixtures of Cyanex923 and HEH(EHP) (2-ethylhexylphosphonic mono-2-ethylhexyl ester) from a bastnaesite sulphuric leaching solution. The effects of different variables on the extraction such as the H 2 SO 4 concentration in the leaching liquor, saturated loaded extraction, and stoichiometric quantity of H 2 O 2 were investigated. Results indicated that the capacity of Ce(III) and F extraction with HEH(EHP) was negligible and Ce(IV) could be strongly extracted by both Cyanex923 and HEH(EHP); on the other hand, CeF 3 had been produced at the stripping stage. Furthermore, appropriate technical parameters of the extraction system have been provided for industry applications and have also been confirmed by multistage countercurrent extraction. On the basis of the above results, the integrated flow of separation and recovery of rare earths from bastnaesite has been provided.

Technology development for rare earth cleaner hydrometallurgy in China

“…These new technologies significantly reduce the chemical consumption and waste discharge in rare earth separation. To comprehensively exploit the values of bastnaesite, creating additional values from rare earth resources, new environment-friendly processes for the separation and the recovery of thorium and fluorine from the bastnaesite treatment were developed [19][20][21]. Many patents are obtained, and among them, some are granted internationally and achieve remarkable economic and social benefits.…”

Extraction and Recovery of Cerium from Rare Earth Ore by Solvent Extraction

“…Many extractants have been reported and applied in nitric acid and sulfuric acid for Ce(IV) extraction, for example, acidic organophosphorus extractants [22][23][24][25][26][27], neutral organophosphorus extractants [28][29][30][31][32][33][34][35][36], amines [37], and bifunctional ionic liquid extractants (Bif-ILEs) Table 2). Synergistic extraction [26,35] is also an important method to enhance the extraction efficiency.…”

“…A number of extractants such as acidic organophosphorus extractants [22][23][24][25][26][27], neutral organophosphorus extractants [28][29][30][31][32][33][34][35][36], amines [37], bifunctional ionic liquid extractants (Bif-ILEs) [38][39][40], and others [41][42][43][44][45][46][47][48] have been used for the extraction and separation of Ce. When Ce was extracted into organic phase, pure cerium solution can be obtained by stripping, and then cerium products can be obtained by adding ammonium carbonate, oxalic acid, ammonia water, and so on.…”

An environmental friendly Na 2 CO 3 -roasting decomposition strategy for the mixed rare earth concentrate

“…According to the data in Table S1, it can be calculated that the final leaching residue percent is about 2.4%, and the leaching percents of F, P, Th and RE can be obtained up to about 97%, 94%, 96% and 98%, respectively. Finally, the H 2 SO 4 -leaching liquors at the step of v and ⑬ can be merged for the subsequent separation of Ce(IV), Th(IV), RE(III) and F through some ready-made technologies [19][20][21]. Consequently, It Fig.…”