Metal biorecovery in acid solutions from a copper smelter slag
| Autor: | Jaakko A. Puhakka, Esa Peuraniemi, Saku Junnikkala, Olli H. Tuovinen, Silja Särkijärvi, Anna H. Kaksonen |
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| Rok vydání: | 2017 |
| Předmět: |
biology
Leptospirillum ferriphilum Metallurgy Metals and Alloys Slag chemistry.chemical_element Acidithiobacillus thiooxidans Sulfuric acid 02 engineering and technology engineering.material biology.organism_classification Copper Industrial and Manufacturing Engineering 020501 mining & metallurgy chemistry.chemical_compound Sphalerite 0205 materials engineering chemistry visual_art Bioleaching Materials Chemistry engineering visual_art.visual_art_medium Leaching (metallurgy) |
| Zdroj: | Hydrometallurgy. 168:135-140 |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2016.08.014 |
| Popis: | 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 S 0 addition, 5% inoculum, and 25 d contact time. Biological S 0 oxidation was an important source of acid in bioleaching experiments. Ferric iron did not enhance the solubilization of Cu and Zn appreciably. |
| Databáze: | OpenAIRE |
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