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In this work, desulfurization by nitric acid leaching is studied in Mequinenza coal, whose characteristics are very low contents of sulfide and sulfate sulfurs in comparison with a very high content of organic sulfur that allows the selective attack on organic sulfur with regard to carbon to be clearly determined. Organic matter is made soluble at high temperatures and there is a threshold temperature...
With the object to produce a low-sulfur coal by nitric leaching, research was undertaken on the influence of the different process parameters, such as temperature, time, acid concentration, particle size and physical pretreatment on sulfur decrease, nitrification of the product, loss of calorific value and variation in ash composition for a Spanish coal.
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