Research Progress on Electro-Chemical Oxidation of Low-Rank Coal to Humic Acid
Ruzhan BAI,
Na LI,
Jianming FAN,
Zhehan LI,
Yanfei HOU,
Zhanping HUANG,
Xing ZHOU
Affiliations
Ruzhan BAI
College of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Huhhot 010051, Inner Mongolia, China
Na LI
College of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Huhhot 010051, Inner Mongolia, China
Jianming FAN
Department of Chemical Engineering, Ordos Vocational College, Ordos 017010, Inner Mongolia, China
Zhehan LI
College of Chemical Engineering, Inner Mongolia University of Technology, Inner Mongolia Key Laboratory of High-Value Functional Utilization of Low Rank Carbon Resources, Huhhot 010051, Inner Mongolia, China
Yanfei HOU
College of Zhongran, Hebei Normal University, Shijiazhuang 050024, Hebei, China
Zhanping HUANG
College of Zhongran, Hebei Normal University, Shijiazhuang 050024, Hebei, China
Xing ZHOU
College of Zhongran, Hebei Normal University, Shijiazhuang 050024, Hebei, China
[Introduction] With the vigorous development of renewable energy, clean and efficient utilization of low-rank coal not only improves resource utilization and economic value but also has great social significance. Low-rank coals such as lignite and weathered coal are the main sources of coal-based humic acid, humic acid is widely used because of its weak acidity, redox, and physiological activity, however, direct extraction is difficult to achieve efficient extraction of humic acid in coal, which usually requires oxidation pretreatment to improve the yield of humic acid. [Method] Firstly, the properties and applications of humic acid were introduced; then, the process, principle, and characteristics of traditional chemical oxidation were introduced, and the new low-rank coal electrochemical oxidation methods and advantages were summarized. Finally, the prospect of electro-chemical humic acid production from low-rank coal was prospected to provide a reference for the preparation of humic acid from low-rank coal. [Result] Electrochemical oxidation method has the advantages of mild conditions, easy control of reaction, high yield, and reduction of environmental pollution. It is a relatively promising method for the preparation of humic acid. [Conclusion] The efficient extraction of humic acid from low-rank coal by electrochemical oxidation driven by renewable power is one of the ways to achieve high value-added utilization of non-fuel in low-rank coal.
