3.3. Size distribution
The average mass distributions of the recovered metallic aluminum
in the different size ranges are presented in Figs. 6 and 7. The
standard deviation in the replicated tests lies between 1.3% and
7.4% in Fig. 6, between 0.8% and 6.5% in Fig. 7a and between 3.1%
and 8.5% in Fig. 7b. Fig. 6 compares the average size distribution
for three packaging types with only crumbled shapes. It can be
observed that the incinerated crumbled cans tended to end up into
the +6 mm range (70 wt.%) together with the foil containers
(45 wt.%), while the incinerated thin foils ended up mainly in the
range 2 mm (43 wt.%). Fig. 7 show the partitioning for different
input sizes and shapes for the can and the foil container. The
results show that different packaging types generate different distributions,
while the input shape (crumbled or not) only had some
influence on the partitioning of the foil container. These results show that the size partitioning in bottom ash depends mainly on the type of packaging.