The thermal decomposition of a Solid Recovered Fuel (SRF) has been studied by two techniques. First, laboratory-scale experiments were performed in a horizontal furnace in which different atmospheres are studied to analyze the dioxins and furans (PCDD/Fs) evolved from the decomposition of the material. Sulfur presence is revealed to be important in PCDD/Fs formation. In the second technique, the emission of various pollutants (PAHs, PCDD/Fs, metals, acid gases …) were determined in a cement kiln fed on different proportions of SRF material, and where a maximum feed rate of 15000 kg SRF/h was achieved. In the laboratory furnace the dioxin toxicity revealed a maximum when the amount of oxygen in the atmosphere increased until approximately stoichiometric conditions. In the cement kiln, all emitted pollutants are under the legal limits. No correlation between SRF input and metal emission was observed.
A kinetic model for the pyrolysis and combustion of PVC and halogen-free electric wires has been obtained. One set of parameters can explain all the experiments at the different atmospheres and at the three different heating rates used. Thermal analysis of different parts of the cable, cover, insulation and conductive metal, both separately and combined, has allowed for understanding of the interaction between the different materials.
6Author email address: nuria.ortuno@ua.es 7 8 ABSTRACT 9Thermal decomposition of printed circuits boards (PCB) is studied, using 10 thermogravimetric analysis to compare the thermal behavior of PCB of mobile phones 11 before and after the removal of the metallic fraction by acid washing. Several dynamic 12 and dynamic+isothermal runs have been carried out at different heating rates (5, 10 and 13 20 K/min), from room temperature to more than 1100 K. Also runs in the presence and 14 in the absence of oxygen were performed (combustion and pyrolysis runs). 15Moreover, TG-MS experiments were performed (both in inert and oxidizing 16 atmosphere) in order to better understand the thermal decomposition of these wastes 17 and identify some compounds emitted during the controlled heating of these materials. 18Different reaction models are proposed, one for pyrolysis and one for combustion of the 19 two kinds of wastes studied, which proved to simulate appropriately the experimental 20 results at all the heating rates simultaneously. 21
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