Semicoking of the residual humin from Berezovsk lignite

Abstract

The semicoking of residual humin from Berezovsk lignite is investigated, with and without additions of modifier. The maximum semicoke yield is observed at 450°C after 0.25 h. Converted for absolutely dry semicoke, it is 64–66%, regardless of the moisture content of the humin. The 11% increase in tar yield when using heavy tar from Arlansk petroleum as the modifier confirms these conclusions. The operational characteristics show that modified semicoke practically matches the properties of traditional reducing agents. Analysis indicates that the tar from the semicoking of residual humin is characterized by relatively high calorific value and contains mainly fractions with moderate boiling points. Accordingly, it may be regarded as a fuel.