Extractant for rare earth metal and method for extracting the sa

Details Extractant for rare earth metal and method for extracting the sa Extractant for rare earth metal and method for extracting the sa

1991-05-31

1993-11-02

Brunsman, David

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423DIG14, 210634, 75710, C01F 1700

Patent

active

052581675

ABSTRACT:
An extractant for extracting rare earth metal ions comprises, for instance, di-(3-methylcyclohexyl)phosphoric acid, di-1-ethylpentylphosphoric acid, docosyl-(2 isopropyl-5-methylcyclohexyl) phosphoric acid, 2-ethylhexyl-2-methylcyclohexylphosphoric acid and/or 2-hexyloctyl-cyclohexylphosphoric acid or a combination of, for instance, dicyclohexylphosphoric acid and di-(2-heptylundecyl) phosphoric acid. A method for extracting rare earth metals comprises the step of bringing an acidic aqueous solution containing ions of rare earth metals into contact with an extraction medium containing an extractant exemplified above to transfer the rare earth metal ions to the extraction medium. The extractant not only exhibits high extractability for rare earth metal ions but also facilitates the back extraction of the rare earth metal ions therefrom. In particular, the extractant has a great difference between the extractabilities for light rare earth metals which are abundantly present in the crust of the earth and for medium and heavy rare earth metals and has an excellent power for mutual separation of these rare earth metals. Thus, the rare earth metal ions can be extracted and separated in high efficiency.

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