Abstract
A coking coal was rendered non-caking by air oxidation at 125°C. The oxidation process was followed by free swelling index, dilatometry, FT-i.r and e.s.r. It was found that the oxidation could be divided into two steps. The main feature observed in the first step was loss of coking properties. In addition there were increases in phenolic hydroxyl content and e.s.r. spin concentration, and a decrease in volatiles in the dilatometric test. In the second step, the caking properties were lost and the rate of carbonyl formation increased. The FT-i.r spectra of the oxidized coal and a non-caking coal were very similar, indicating that the presence of oxygenated groups is related to the absence of plastic properties. A mechanism of the oxidation process is proposed.
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