Abstract:

By implementing industrial analysis and elemental analysis of lignite and semi-coke of lignite,we could easily find organic ingredients and coalification of lignite have taken great places after low temperature pyrolysis upgrading technology.Their comparison of infrared spectroscopy showed that the main hydrophilic functional groups in semi-coke included –OH,–H,–NH and –O– ect.Their contents were lower than in lignite.Carried on particle size analysis and flotation experiments of semi-coke,adopted 0#diesel,kerosene,ZS and their combination,the results showed that flotation effect was better when using complex flotation reagents than single reagent.But no matter which kind of reagent institution was adopted,reagents consumption were both enormous,as well as the high ash of concentrate.By means of analyzing the reasons of enormous reagents consumption,we could drow the conclusion that high degree of porosity was the dominant factor.

Key words: Key words:lignite, semi-coke, infrared spectroscopy, complex flotation reagents, degree of porosity