C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/18 (2006.01) C22B 3/22 (2006.01) C22B 7/00 (2006.01) C22B 15/14 (2006.01)
Patent
CA 2384451
A method of recovering base metal from a tailings dump which includes the steps of: aerating a surface layer of the dump; adjusting the pH and the moisture content of the surface layer to provide conditions favourable for bacterial oxidation of sulphide minerals; allowing bacterial oxidation to take place for a controlled period; after the controlled period removing the oxidised surface layer and adding water thereto to form a slurry; separating the slurry into solids and a solution; and recovering base metal from the solution.
La présente invention concerne un procédé de récupération de métal de base à partir d'un terril de stériles, comprenant les étapes suivantes: mise à l'air libre d'une couche de surface du terril; réglage du pH et de la teneur en eau de la couche de surface pour obtenir des conditions favorables à l'oxydation bactérienne de minéraux sulfurés; oxydation durant une période contrôlée; à la fin de la période contrôlée, élimination de la couche de surface oxydée et adjonction d'eau sur celle-ci pour former une boue; séparation de la boue pour former des particules solides et une solution; et récupération de métal de base à partir de la solution.
Craven Peter Michael
Tunley Trevor Hugh
Billiton Sa Limited
Oyen Wiggs Green & Mutala Llp
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