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- W1970047601 abstract "Direct extraction of metals from solids with complexing agents in supercritical CO2 (SC-CO2) has recently attracted interests in separation, purification, recovery, and analysis of metals. In the present study, the static/dynamic extraction of rare earth elements (Nd, Ce) from their oxides (Nd2O3, CeO2) with organophosphorus complexes with HNO3 and H2O in SC-CO2 was investigated. The static extraction efficiency of Nd from Nd2O3 with the tri-n-butylphosphate (TBP)-HNO3 complex could reach 95% under optimized experimental conditions. However, the static extraction efficiency of Nd from Nd2O3 with the trilkyl phosphine oxide (TRPO)-HNO3 complex was less than 10%, and the static extraction efficiency of Ce from CeO2 with the TBP-HNO3 complex was less than 1%. The dynamic extraction efficiency of Nd from Nd2O3 with the TBP-HNO3 complex could reach more than 97%. Effects of parameters were evaluated on the extraction efficiency to ascertain the optimum conditions. This study illustrated the extraction process using the TBP-HNO3 complex in SC-CO2 would be feasible for separation, purification, recovery, and analysis of some rare earth elements from various oxide mixtures." @default.
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- W1970047601 date "2010-04-01" @default.
- W1970047601 modified "2023-09-26" @default.
- W1970047601 title "Extraction of rare earth elements from their oxides using organophosphorus reagent complexes with HNO3 and H2O in supercritical CO2" @default.
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- W1970047601 doi "https://doi.org/10.1016/s1002-0721(09)60084-3" @default.
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