with batch compaction
and batch preheating by flue gases exhausted
by a recuperator connected to segmented type glass
melter. After batch preheating, a thin layer of batch
(compacted) is heated by burners before it enters a
foaming compartment (sulfate foaming), that is
heated by glass melt electrodes. After foaming, the
melt enters the clearing zone with a shallow glass
melt depth to remove residual bubbles and then it
flows through a zone with extra stirring (