Process for the indirect bioleaching of zinc sulphide

Details Process for the indirect bioleaching of zinc sulphide Process for the indirect bioleaching of zinc sulphide

C - Chemistry, Metallurgy

22

B

C22B 19/20 (2006.01) C22B 3/00 (2006.01) C22B 3/18 (2006.01)

Patent

CA 2663356

A process for the indirect bioleaching of zinc sulphide is disclosed, and includes leaching, solvent extraction, electrowinning, and oxidant regeneration steps in a closed circuit. The leaching step utilizes ferric iron as an oxidant, the solvent extraction step utilizes di-2 ethylhexyl phosphoric acid (D2EHPA) as a solvent extraction reagent, the oxidant regeneration step includes the oxidation of ferrous iron to ferric iron in a ferric iron generator; and the process includes minimizing the loading of ferric iron onto the solvent extraction reagent in the solvent extraction step by means of one or more of the steps of minimizing the concentration of ferric iron in the leach stream and minimizing the oxidation of ferrous iron to ferric iron in the solvent extraction step.

Procédé de biolixiviation indirecte de sulfure de zinc consistant en des étapes de lixiviation, d'extraction au solvant, d'électrorécupération et de régénération d'oxydant en circuit fermé. L'étape de lixiviation met en application du fer ferrique en tant qu'oxydant, l'étape d'extraction au solvant utilise de l'acide di-2 éthylhéxyle phosphorique (D2EHPA) en tant que réactif d'extraction au solvant, l'étape de régénération de l'oxydant consiste à oxyder du fer ferreux en fer ferrique dans un générateur de fer ferrique. Ce procédé consiste à limiter au maximum la charge de fer ferrique sur le réactif d'extraction au solvant dans l'étape d'extraction au solvant au moyen d'une ou plusieurs des étapes de limitation de la concentration de fer ferrique dans le flux de lixiviation et à limiter au maximum l'oxydation du fer ferreux en fer ferrique dans l'étape d'extraction au solvant.

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