Metal biorecovery in acid solutions from a copper smelter slag
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|Varhainen verkossa julkaisun päivämäärä||30 elokuuta 2016|
|DOI - pysyväislinkit|
|Tila||Julkaistu - 2017|
Slags from metallurgical processes represent a potential resource of metals but also waste materials that have not been successfully beneficiated to date. For this study, a bulk slag sample from a copper smelter was evaluated under chemical and bacterial leaching conditions to test the solubilization of Cu and Zn in acidic, sulfate-rich solutions. Fayalite, magnetite and glassy silicates as well as Cu-sulfides and sphalerite were the major phases of the slag. The acid demand of the slag was satisfied with a 24 h contact time with sulfuric acid. A mixed mesophilic culture capable of oxidizing iron and sulfur and dominated by Acidithiobacillus thiooxidans, A. ferrooxidans, and Leptospirillum ferriphilum was used for bioleaching. The maximum extent of Zn leaching was 14%, contrasted with 83% Cu in experiments with an initial pH of 2.1–2.2, 10% pulp density, 10 g L− 1 S0 addition, 5% inoculum, and 25 d contact time. Biological S0 oxidation was an important source of acid in bioleaching experiments. Ferric iron did not enhance the solubilization of Cu and Zn appreciably.