In a method of removing metals such as mercury from flue gas produced by
combustion devices, ammonia and optionally carbon monoxide are injected
into the flue gas in a manner so that there are sufficient amounts of
these materials in the flue gas when the flue gas is at a temperature of
from 900.degree. F. to 1350.degree. F. to oxidize the metals within the
flue gas. The oxidized metals are then attracted to particulates present
in the flue gas. These particulates bound with oxidized metals are removed
from the flue gas by a particulate removal device such as an electrostatic
precipitator or baghouse.
