The invention relates to the use, as an extraction agent for extracting at least one rare earth from an aqueous phase including phosphoric acid, of at least one compound of the following general formula (I):
where
n is an integer equal to 0, 1 or 2,
R
1
and R
2
are H or an aliphatic hydrocarbon group,
one of R
3
and R
4
has the following formula (II):
where R
5
and R
6
are a hydrocarbon, hydroxyl or alkoxyl group, and
the other one of R
3
and R
4
has one of the following formulas (II′) and (III):
where R
5
′ and R
6
′ are a hydrocarbon, hydroxyl or alkoxyl group, and R
7
and R
8
are H or an aliphatic hydrocarbon group.
The invention also relates to a method for recovering at least one rare earth using said compound, as well as to specific compounds as such.
本发明涉及使用以下通式(I)至少一种化合物作为从包括
磷酸的
水相中提取至少一种稀土的萃取剂:
其中n是等于0、1或2的整数,R1和R2是氢或脂肪烃基,R3和R4中的一个具有以下式(II):
其中R5和R6是烃基、羟基或烷氧基,R3和R4中的另一个具有以下式(II')和(III)中的一种:
其中R5'和R6'是烃基、羟基或烷氧基,R7和R8是氢或脂肪烃基。本发明还涉及使用所述化合物回收至少一种稀土的方法,以及特定的化合物本身。