Dissolution and recovery of at least one Nb or Ta element and at least one other element or rare earth elements from minerals and concentrates

摘要

A procedure for the dissolution of at least one element chosen between niobium and tantalum and at least one other element chosen between uranium and rare earth elements, advantageously for the dissolution of niobium, tantalum, uranium and rare earth elements, contained in a mineral or a mineral concentrate, characterized in that it comprises: - the calcination of a material, comprising said elements, so that this material is mixed, dry or in the presence of water, with an acidic calcining agent in order to obtain a calcined; said material consisting of said mineral or concentrate or having been obtained from said mineral or said concentrate and providing said acidic calcination agent for calcination in a sulfate medium; and - dissolving in an aqueous solution of the calcined obtained in order to obtain a thick suspension, in which the liquid fraction includes iron, in a ferric state, at a concentration of at least 50 g / l, advantageously at least 70 g / l and very advantageously of at least 120 g / l.