Ash Composition of Lignite

Resumo

Five lignite samples from Russia’s Itatsky, Munai, Arkharo-Boguchansky, and Kangalassky fields and the Mongolian Baganuur field are characterized on the basis of technical analysis, their elemental composition, calorific value, petrographic composition, and the properties of their mineral component. Experimental data regarding the chemical composition of their ash residues permit empirical calculation of temperatures characterizing ash fusibility, the temperature of normal liquid slag removal, and the temperature of slagging onset. The melting temperatures are found to rise with increase in content of the acidic oxides SiO₂ and Al₂O₃ in the ash residues but to fall with increase in the concentration of Fe₂O₃, CaO, and MgO.