The sampling was performed by collecting 7 kg of fly
ash at the fabric filter, before its discharge in a storage
tower, at intervals of 4 h over the course of 48 h, thus
enabling collection of a final sample of 85 kg. This
sample was taken as representative of the APC residue
generated by this facility in agreement with their own
control analysis. Afterwards, a representative subsample
(about 5 kg) was obtained by quartering the at room temperature, under N2 atmosphere avoiding
lime carbonation.