Filling underground cavities involves filling flowing material into cavity in which filler material solidifies; it involves using filler material with residual material arising during flue gas desulphuration

摘要

The method involves filling a flowing material into a cavity in which the filler material solidifies. It involves using a material with a residual material arising during flue gas desulphuration. The residual material can be produced during desulphuration by spray absorption. An independent claim is also included for a material for filling underground cavities.