Journal
FUEL
Volume 85, Issue 7-8, Pages 1117-1124Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2005.10.011
Keywords
desulfurization; leaching; flotation; potassium hydroxide
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Mezino coal contains a high percentage of ash and both organic and inorganic sulfur. The ash and sulfur contents can be reduced using physical-chemical and chemical methods. 'Froth flotation' is a physical-chemical method that is capable of reducing inorganic sulfur and the ash content of coal. In this research, reducing the ash content of mezino coal by 83%, inorganic sulfur by 72% and its total sulfur content by 63% using flotation in alkaline pH and in the presence of copper ion was successful. The coal flotation obtained was 73%. The coal concentration obtained from fliotation was leached using potassium hydroxide/methanol mixture and its total sulfur and ash contents were reduced by approximately 33 and 8%, respectively. Hence, using the combination of the two mentioned methods, the total sulfur and ash contents of coal were reduced by 82.50 and 82.34%, respectively. It is an unprecedented and welcome result compared to the previous work. (c) 2005 Elsevier Ltd. All rights reserved.
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