Recovery of Ag and Au from synthetic and industrial wastewater by 2-step ferritization and Lt-delafossite (cas 12013-12-6) process via precipitation

Add time:07/31/2019    Source:sciencedirect.com

Due to the global rising demand there is an enormous interest to recover noble metals most efficiently from aqueous solutions, in particular industrial wastewater. Herein we demonstrate a new concept to recover Ag and Au from sulfate, chlorine and nitrate containing waters e.g. from catalysis production. Therefore two different treatment procedures, called 2-step ferritization and Lt-delafossite process, are presented which are based on a modified ferrite process. The phase assemblage can be controlled by the adjustment of the reaction parameters. During the 2-step ferritization process, Ag0 and Au0 are precipitated within one separate step. The precipitated phases obtained by the Lt-delafossite process are pure delafossite AgFeO2 and composite particles of Ag0, AgFeO2 and Fe3O4. By using these low energy, fast (<20 min) and easy to handle precipitation processes, Ag and Au can be recovered to ≥99.99% from wastewater. In consequence, these procedures help to avoid additional waste streams.

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