The Dependence of Humic Acids Content of the Oltenia Lignite, Function of the Macropetrographic Constituents (Litotypes)

Abstract

Wood brown coal (lignite) from the Pliocene Oltenia (photo 1) were divided into three constituent’s macropetrographics, litotypes, and analyzed in order to identify the differences in behavior that occur depending on the technology layer exploited. There was chosen to analyze the humic acids extracted from lignite, being the main carriers of property by briquetting without binder and the characteristics of fertilizers in plant nutrition and soil improvement. There were detected significant differences linked to the chemical age (level of in carbonization) as well as the petrographic structure of the coal layer exploited.