| abstract |
The invention relates to a process for extracting at least a first chemical element E 1 from a material additionally comprising at least one oxide of a second chemical element E 2 chosen from silicon, iron, aluminium and calcium. This process comprises: the mixing, in the melt state, of said material with at least one oxide of a third chemical element E 3 , and/or at least one precursor of such an oxide in order to form a glass matrix comprising said first chemical element E 1 , - bringing said glass matrix, in the melt state, into contact with a liquid phase comprising a fourth chemical element E 4 , said fourth chemical element E 4 being a reducing agent capable of reducing said first chemical element E 1 , and - separating said liquid phase comprising said first chemical element E 1 from said glass matrix. |