Fate of lead, copper, zinc and antimony during chemical looping gasification of automotive shredder residue
Artikel i vetenskaplig tidskrift, 2021

Gasification experiments in this study were performed in a 2–4 MW indirect gasifier coupled to a semi-commercial CFB combustor at Chalmers University of Technology. Experiments were carried out during 13 days with automotive shredder residue (ASR), giving a unique opportunity to investigate the bed material under realistic conditions and with long residence times. The metal rich ash was accumulated in the bed, gaining some oxygen carrying capabilities, creating a chemical looping gasification (CLG) process. This study aims to expand the knowledge about the chemistry of zinc, copper, lead and antimony during CLG of ASR. Several experimental methods have been utilized, such as XRD, SEM-EDX and XPS along with detailed thermodynamic calculations to study chemical transformations that can occur in the system. Thermodynamic calculations showed that the reduction potential affect the phase distribution of these elements, where highly reduction conditions result in heavy metals dissolving in the slag phase. Copper and zinc ferrites, lead silicates and antimony oxides were identified at the particle surfaces in the bottom ash. The formation of an iron rich ash layer plays an important role, especially for copper and zinc speciation. The main pathways in the complex CLG system have been discussed in detail.

Chemical looping gasification

Fluidized bed

Trace elements

Automotive shredder residue

Combustion

Ash characterization

Författare

Ivana Stanicic

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Isabel Cañete Vela

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

R. Backman

Umeå universitet

Jelena Maric

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Yu Cao

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Tobias Mattisson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Fuel

0016-2361 (ISSN)

Vol. 302 121147

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Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Energiteknik

Naturresursteknik

Kemiteknik

Geovetenskap och miljövetenskap

Kemi

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1016/j.fuel.2021.121147

Mer information

Senast uppdaterat

2021-07-09