A high volatile bituminous coal was subjected to a series of organic acid treatment in steps using citric acid (1hr and 2hr) and buffered EDTA with acetic acid(1to 3 hr) at room temperature.Leaching was performed with acetic acid (2N) also for 1hr. Citric acid procedure reduced the mineral matter below 1.94%. Calcites and aluminates are completely removed along with substantial quantity of silicates by citric acid leaching. The change in absorption of organic functional groups and mineral matter in coal samples were studied using Fourier transform infrared spectroscopy (FTIR). Analysis indicated that oxygen containing species were decreased in the coal structure during acetic acid and citric acid (40%) procedure and buffered EDTA 3hours leaching. As the period of leaching with buffered EDTA increased from 1hr to 3hr, organic functional groups and mineral functional groups decreased its intensity. The results indicated that the described acid treatment procedures with citric acid have measurable effects on the coal structure.
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