in the magnetic fraction of the finer particles (9.8%), whereas UA
raw ash showed a decline of 5.1% for 1.9% of the magnetic fraction.
The literature reports an increase in magnetic particle concentration
in the finer fractions of coal fly ash [32,36], as observed for
UB ash. The unexpected behavior of UA ash may be related to a
number of factors, including the different burn conditions and
emission control used. These results indicate that the use of UB
raw ash is more favorable for the production of zeolite Na-P1.