Abstract
Recovery of aluminium from multi-component packaging using a fluidised bed reactor This study presents the use of fluidised bed combustion to produce thermal energy, aluminium recovery and the reduction of the Tetra Pak and Combibloc packaging waste stream. Fluidisation and the pneumatic transport, which take place in the same apparatus, allow recovering bits of the aluminium foil from the combustion zone. The limited time spent in the high temperature zone leads to a high content of free metal in the solids separated in the ash trap and cyclone. Other solid products are practically chemically inert and may be disposed in a landfill of municipal or inert wastes.
Highlights
Thermal engineering is widely applied in the economy and has recently shown a growing and significant meaning in the process of converting various waste materials
The research shows a possibility of utilizing multilayer packages as fuel for fluidised bed furnaces, while the combustion of such materials causes a relatively small emission of gaseous pollution
The knowledge of the chemical composition of these packages makes it possible to use them as alternative fuel, to which biomass emission standards can be applied. Their combustion will contribute to decreasing carbon dioxide concentration in the atmosphere
Summary
Thermal engineering is widely applied in the economy and has recently shown a growing and significant meaning in the process of converting various waste materials. The calculation of the amount of dry exhausts produced by the burning of Tetra Pak packages was done under the assumption that the only flammable components are cellulose and polyethylene On the other hand, considering that "Amount III" is composed mostly of non-volatile substances so most of them turn to dust (Table 4), which implies using a dust filtering system with a total efficiency of 90% (that is necessary to recover aluminium), which is needed to meet the emission standards It has been established in which form aluminium leaves the fluidised bed reactor by chemically analyzing and calculating the mass balance of the main oxide constituents.
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