This paper describes the principles and methods of extracting humic acid product from lignite. 摘要论述了褐煤中提取腐殖酸产品的方法及原理。
Humus was added into nonorganic silt to clarify the effect of a variety of additives on the cemented soil performance. 在去除有机质的黏质粉土中加入腐殖酸，研究了经某种液态添加剂改良后的水泥土特性。
