An increase in the concentration of acidic surface groups, the sorption exchange capacity of oxidized coal, and the yield of humic acids by 20-40% due to mechanical action with alkaline and oxidizing alkaline reagents was found. According to the IR-spectroscopic data of coals and the potentiometric titration of acidic groups, a decrease in the concentration of carboxyl groups in aliphatic fragments due to their maximum sorption capacity for metal ions was noted. Humic acids were characterized by a significant increase in the number of oxygen-containing groups and stable polyconjugated heteroaromatic fragments as a result of mechanochemical action.
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