Metal and fluorine values recovery from fluoride salt matrices

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 3/04 (2006.01) C01B 7/19 (2006.01) C01B 9/08 (2006.01) C01F 5/28 (2006.01) C01F 5/30 (2006.01) C01F 11/02 (2006.01) C01F 11/46 (2006.01) C22B 1/00 (2006.01) C22B 60/00 (2006.01)

Patent

CA 2222639

The process for converting feed materials of high mineral content containing primary metal values and fluorine values to the primary metal or useful compounds thereof and to fluorine values or useful compounds thereof, wherein the feed materials constitutes a difficultly soluble matrix, the process having the steps of contacting the feed materials in a reactor with a humidified, gaseous system at from about 200 ~C to about 1600 ~C, the contacting being carried out such as to convert the primary metal values to oxide residues at commercially acceptable rates and to evolve gaseous fluoride from the feed, digesting said oxide residues in an acidic digest medium and separating the primary metal values from the resulting digest liquor and from other components of the residues.

L'invention concerne un procédé pour extraire des métaux utiles et du fluor à partir de matières premières à haute teneur en minerai contenant ces métaux et ce fluor, lorsque ces matières premières constituent une matrice difficile à solubiliser. Le procédé consiste à mettre en contact les matières premières dans un réacteur avec un système gazeux humide à une température dans la plage allant d'environ 200 ·C à environ 1600 ·C, le contact s'effectuant de manière à convertir les composés de métaux utiles en oxydes de ces mêmes métaux avec une efficacité acceptable sur le plan économique, à provoquer l'émission de fluorure gazeux des matières premières, à digérer les oxydes métalliques résiduels dans un milieu de digestion acide et à séparer les composés des métaux utiles obtenus de la liqueur de digestion finale et des autres composants résiduels.

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