Bioflotation and Bioleaching as an Alternative Method for Desulphurization and Ash Reduction in Tabas Coal
محل انتشار: مجله معدن و محیط زیست، دوره: 15، شماره: 2
سال انتشار: 1403
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 63
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شناسه ملی سند علمی:
JR_JMAE-15-2_011
تاریخ نمایه سازی: 8 بهمن 1402
چکیده مقاله:
Tabas coal possesses favorable plastometric properties that make it suitable for use in metallurgical industries as coking coal. However, its high sulfur content, which stands at approximately ۲%, poses a significant environmental pollution risk. Additionally, reducing ash content to below ۱۰% is a critical objective of this study to prevent a decline in coal's thermal efficiency in the metallurgical industries. This research work investigates the removal of sulfur and ash from Tabas coal samples using the biological methods including bioflotation and bioleaching. Initially, a combination of mesophilic bacteria including Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptosprillium ferrooxidans were employed in the bioflotation method to detain pyrite sulfur in the Tabas coal samples. The highest reduction percentages of pyrite sulfur and ash were equal to ۶۲% and ۵۴.۱۸%, respectively. In the next stage, bioleaching experiments were conducted, the effect of the test time, percentage of bacteria by volume, percentage of coal solids, and absence of bacteria on the amount of sulfur and ash removal was investigated. The test time emerged as the most critical factor. The best sulfur removal was achieved using bioleaching, with a maximum removal of ۷۲.۴۳%, observed for the PE coal sample. Bioflotation also achieved significant sulfur removal, with a maximum removal of ۶۱% observed for the same sample. On the other hand, the best ash removal was achieved using bioflotation, with a maximum removal of ۶۸.۹۸% observed for the PE coal sample, and a maximum removal of ۶۹.۳۴% observed for the B۴B۲ coal sample using bioleaching. Finally, this research work conducted a comparison of biological methods to determine the amount of sulfur and ash reduction achieved. The results showed that both bioleaching and bioflotation were effective for coal desulfurization and ash removal, with bioleaching performing slightly better for sulfur removal and bioflotation performing slightly better for ash removal.
کلیدواژه ها:
نویسندگان
Mohammadreza Shahbazi
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
Hadi Abdollahi
School of Mining Engineering, College of Engineering, University of Tehran, Tehran ۱۴۳۹۹۵۷۱۳۱, Iran
Sied Ziaeddin Shafaei
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
Ziaeddin Pourkarimi
Iran Mineral Processing Research Center (IMPRC), Tehran, Iran
Sajjad Jannesar Malakooti
Tabas Coal Mines Complex (TCMC), Iranian Mines & Mining Industries Development & Renovation (IMIDRO), Tabas Iran
Ehsan Ebrahimi
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
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