Flyash can by treated in several different ways. The tradi-
tional method, such as direct disposal, has been prohibited.
The most frequent means of flyash disposal used include:
(1) placement in a well-designed landfill; (2) immobiliza-
tion through solidification/stabilization and then landfill
or reuse; (3) separation of heavy metals by volatilization
at high temperature or hydrometallurgical extraction by
dissolution in acidic or alkaline medium [5,6]. Where chem-
ical stabilization technology is strongly recommended and
used to treat flyash because of its environmental safety and
cost effective [4].