Refinement of the Flotation Reagent Plan Based on Coal Feed Ash Content

Articles in Press

Document Type : Research Paper

Authors

1 Faculty of Engineering, University of Birjand, Birjand, South Khorasan, Iran.

2 Senior process engineer, Tabas Parvadeh Coal Company (TPCCO).

10.22059/ijmge.2024.360260.595070

Abstract

The effect of frother dosage (67, 200, and 400 g/t), collector dosage (200, 600, and 1000 g/t) and frother type (Mixed aliphatic alcohol (MAA), Methyl Isobutyl Carbinol (MIBC), and pine oil) on the flotation performance of three coal samples with various ash contents of 45.1% (high ash content coal, HAC), 36.8% (moderate ash content coal, MAC) and 30.7% (low ash content coal, LAC) was studied. The optimal flotation conditions for each coal sample were quite different. For HAC, a clean coal with ash content of 12.8% and yield of 38% is produced at optimal conditions of MIBC as frother, dosage of frother 361 g/t, and collector dosage of 200 g/t. In the case of MAC, a clean coal with ash content of 10.2% and yield of 46% is produced at optimal flotation conditions of MAA as frother, dosage of frother 148 g/t, and dosage of collector 200 g/t. For LAC, a clean coal with ash content of 9.87% and yield of 57.4% is produced at optimal flotation conditions of Pine oil as frother, dosage of frother 174 g/t, and collector dosage of 1000 g/t. For low ash content feed coal in comparison with the high ash content feed coal, a lower frother dosage, higher collector dosage and pine oil frother instead of MIBC frother must be used. The optimal conditions for HAC flotation were validated in a coal washing plant. After exerting the necessary modifications in the flotation reagent scheme, yield, combustive material recovery (CMR) and separation efficiency (SE) of the plant increased 5.9%, 11%, and 7.5%, respectively which results in more clean coal production of about 14160 t/y.

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References

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International Journal of Mining and Geo-Engineering

Articles in Press, Accepted Manuscript
Available Online from 26 September 2024

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