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Bioleaching of a low grade sphalerite concentrate produced from flotation tailings | ||
| International Journal of Mining and Geo-Engineering | ||
| مقاله 3، دوره 50، شماره 2، اسفند 2016، صفحه 169-173 اصل مقاله (562.46 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/ijmge.2016.59825 | ||
| نویسندگان | ||
| Javad vazife Mehrabani* 1؛ Seyyed Ziaadin Shafaei2؛ Mohammad Noaparast2؛ Mohammad Mousavi3 | ||
| 1School of Mining Engineering, Sahand University of Technology, Tabriz, Iran | ||
| 2School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 3Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran | ||
| چکیده | ||
| In this research work, the zinc extraction was investigated, using bioleaching process from a low grade zinc concentrate which was produced from the accumulated flotation tailings. Zinc content was initially upgraded to 11.97% by flotation process. Bioleaching experiments were designed and carried out by a mixed culture of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, Leptospirilium ferrooxidans, as well as a mixed moderate thermophile bacteria in the shake flasks. Effect of two types bacteria, indigenous bacteria accompany by concentrate sample, and added mixture of bacteria were evaluated. The term of indigenous bacteria refers to the bacteria which initially exist in the natural concentrate sample. The results showed that more than 87% and 94% of Zn was dissolved in the bioleaching condition of mesophile and moderate thermophile bacteria, respectively. Comparing bioleaching and leaching tests indicated that mesophile bacteria improved Zn extraction 36%, in which contribution of concentrate indigenous bacteria (test condition of non-inoculation) and added mesophile mixed bacteria were equal to 34% and 66% of that improvement, respectively. In addition, moderate thermophile bacteria improved sphalerite leaching up to 38% in which contribution of concentrate indigenous bacteria and added moderate bacteria were about 50% separately. | ||
| کلیدواژه‌ها | ||
| Bioleaching؛ Pyrite؛ Tailing؛ Sphalerite concentrate | ||
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