3. Laboratory pot furnace tests
3.1. Method and materials
For MSWI bottom ash only the concentration and yield of aluminum
beverage cans scrap could be traced using the identification
analysis of Fig. 1. The identification and study of other
aluminum packaging types from bottom ash scraps, as well as
the recovery rates, required another research approach for which
a laboratory scale pot furnace was used. Co-combustion experiments
were conducted with base household waste and given
amounts of aluminum packaging as the only source of metallic aluminum
input waste. The physical size and shape of the packaging
was varied to observe the role it plays in the recovery and partitioning
in bottom ash. The shapes used were either a flat sheet
or a sheet crumbled into a ball, which are typical for aluminum
packaging in household waste. For the thin foils only a single size
sheet was used and these crumbled naturally when fitting them
into the pot furnace with the base waste. Three types of aluminum
sheet and foil packaging were investigated: standard beverage cans
of 330 ml and thickness 200 lm, foil containers of 650 ml and
thickness 65 lm, and thin foils 7 lm thick.