Humic Acids Form Brown Coal Mechanically Treated in the Presence of Air
A. G. PROYDAKOV1, A. V. POLUBENTSEV2 and L. A. KUZNETSOVA2
1Irkutsk State University, Ul. Lermontova 126, Irkutsk 664033 (Russia) E-mail: dekanat@chem.isu.ru
2Irkutsk State University, Institute of Petroleum and Coal-Chemical Synthesis, Ul. Lermontova 126, Irkutsk 664033 (Russia)
Pages: 641-647
Abstract
Efficiency of brown coal oxidation under various conditions including those of mechanical activation is investigated. It is established that mechanical treatment accelerates coal oxidation thus increasing the yield of humic acids. As shown in the NMR 13C investigation, humic acids from the initial and mechanically treated coal samples substantially differ in the structural-group composition. Field tests showed that humic acids from mechanically treated coal samples possess higher physiological activity, which affects an increase in crop capacity of agricultural plants.
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