Separation of scandium from tantalum residue using fractional li

Details Separation of scandium from tantalum residue using fractional li Separation of scandium from tantalum residue using fractional li

1994-08-04

1996-02-20

Dawson, Robert A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423 211, 210634, 210639, 210912, C01F 1700

Patent

active

054926807

ABSTRACT:
A process for separating scandium from an aqueous solution comprised of a first group of metals, scandium and a second group of metals includes the steps of: (a) providing a scandium-containing material and preparing therefrom an aqueous sulfuric acid solution containing a first group of metals, scandium and a second group of metals; (b) contacting the aqueous sulfuric acid solution with an organic liquid solution whereby scandium and the first and second groups of metals are extracted into the organic liquid solution to create a loaded organic solution; (c) scrubbing the loaded organic liquid solution first with an sulfuric acid solution to remove selected metals in the first group of metals from the organic liquid solution and then with a dilute HF solution to prepare the organic liquid solution for stripping; (d) stripping the remaining metals in the first group of metals from the loaded organic liquid solution with a HF solution so that only scandium and the second group of metals remain on the organic liquid solution; and (e) using a fractional stripping system to strip scandium from the loaded organic liquid solution with a HF solution so that the scandium is released from the organic liquid solution and only the second group of metals remains on the organic liquid solution.

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