Ion exchange method for the recovery of scandium

Details Ion exchange method for the recovery of scandium Ion exchange method for the recovery of scandium

1987-09-11

1989-03-28

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423263, 423DIG14, 210672, 210685, 210688, 75101R, 75101BE, 75121, C01G 1700

Patent

active

048162337

ABSTRACT:
A method of recovering quantitatively trace amounts of scandium from aqueous solutions containing large amounts of other metals consists of reducing any manganese and iron in the solution to the divalent states of manganese and iron. The solution is then adjusted to a pH from about 1.9 to about 2.1 and passed through a column of the ion exchange resin in the hydrogen form having an iminodiacetic acid functionality. The scandium is absorbed on the column and any base metals and rare earth metals which were also absorbed are removed by eluting with a dilute acid without removing the scandium. The scandium is subsequently removed from the column by eluting with a solution containing a chelating agent such as diglycolic acid. The scandium is then recovered from the solution by precipitation, filtering, washing, drying and calcined to the oxide.

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