Method for extracting a refractory metal from an ore, a concentrate or a waste product
AssigneesParis Sciences Et Lettres, Ecole Nationale Superieure de Chimie de Paris
InventorsGrégory Lefevre, Thomas Degabriel
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Abstract
The present invention relates to a method for extracting a refractory metal selected from Nb, Ta, Mo, W and V, from a solid material comprising the refractory metal in an oxidised form, the method using a layered double hydroxide, and the use of a layered double hydroxide for extracting or purifying a refractory metal selected from Nb, Ta, Mo, W and V.
Claims17
A method for extracting a refractory metal M selected from Nb, Ta, Mo, W, V, or a mixture of at least two of said refractory metals, from a solid material comprising said refractory metal in an oxidized form, wherein said method comprises at least the following steps:
- i) a step of contacting said solid material with a first aqueous composition comprising a first layered double hydroxide which is insoluble in said first aqueous composition, said first layered double hydroxide containing interlayer anions A1n−, n being a positive integer, to form polyoxometallates of said refractory metal which are soluble in said first aqueous composition, said polyoxometallates having a negative charge q− such that q is a positive integer and q>n,
- ii) a first step of ion exchange in said first aqueous composition of said interlayer anions An—with said polyoxometallates from step i), to form a second layered double hydroxide which is insoluble in said first aqueous composition, and
- iii) a second step of ion exchange of said polyoxometallates with anions A2p− in a second aqueous composition comprising said anions A2p−, p being a positive integer, to form monomeric species of said refractory metal which are soluble in said second aqueous composition, said monomeric species having a negative charge m− such that m is a positive integer and m≤p.
Dependencies are inferred from the claim text.