Fate of lead, copper, zinc and antimony during chemical looping gasification of automotive shredder residue
Journal article, 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


Ash characterization


Ivana Stanicic

Chalmers, Space, Earth and Environment, Energy Technology

Isabel Cañete Vela

Chalmers, Space, Earth and Environment, Energy Technology

R. Backman

Umeå University

Jelena Maric

Chalmers, Space, Earth and Environment, Energy Technology

Yu Cao

Chalmers, Industrial and Materials Science, Materials and manufacture

Tobias Mattisson

Chalmers, Space, Earth and Environment, Energy Technology


0016-2361 (ISSN)

Vol. 302 121147

Material recycling of plastics via thermal conversion

Swedish Energy Agency (44239-1), 2017-12-15 -- 2019-12-31.

Chemical-looping gasification (CLG) of biomass for fuel production

Swedish Energy Agency (43220-1), 2017-01-01 -- 2019-12-31.

Trace element speciation with oxygen carriers

Formas (2017-1095), 2018-01-01 -- 2020-12-31.

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Energy Engineering

Environmental Engineering

Chemical Engineering

Earth and Related Environmental Sciences

Chemical Sciences


Chalmers Materials Analysis Laboratory



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7/9/2021 7