Preparation and Application of Humic Acid From Low-rank Coal

Humic Acid(HA) mainly exists in low-rank coal,such as peat,lignite and weathered coal.This paper describes some types of technology of extracting HA from low-rank coal.Then a simple retrospect about the different utilization in many industry is listed.At last,some effective advise and the prospect of HA and low-rank coal are put forward.