Main source of lead is galena . It is converted to
by :
(A) :
(B) :
Self-reduction process is :
Lead Chamber -
It is cheaper method
-
Lead chamber process -
In this process SO2 is oxidised to SO3 by the oxides of nitrogen and the SO3 thus formed is dissolved in steam to form H2So4
-
reduces
to
and
is liberated. This a called as self-reduction.