Comparative life cycle assessment (LCA) of accelerated carbonation processes Using Steelmaking Slag for CO2 Fixation

Li Shan Xiao, Run Wang, Pen Chi Chiang, Shu Yuan Pan, Qing Hai Guo, E. E. Chang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Carbon capture, utilization, and storage (CCUS) is one of the most prominent emerging technologies for mitigating global climate change. In this study, a comparative evaluation for CO2 fixation by carbonation of steelmaking slag was performed by life cycle assessment (LCA) using Umberto 5.5.4 software, with the Swiss Eco-invent 2.2 database. Six scenarios of carbonation for basic oxygen furnace slag (BOFS), steel converted slag (SCS), and blended hydraulic slag cement (BHC) in different types of reactors and/or method were established. The environmental impacts for each scenario are quantified using the valuation system of ReCiPe, where global warming potential (GWP), ecosystem quality potential (EQP), and human health potential (HHP) were evaluated. In addition, sensitivity analysis was carried out to evaluate the relevant uncertainties of heating efficiency on the GHG emissions in direct carbonation processes. According to the results of LCA and sensitivity analysis, the direct carbonation of steelmaking slag in a slurry reactor was found to be the most attractive method, since the GWP was the lowest among the selected scenarios. Furthermore, the best available technology (BAT) for CO2 capture by carbonation processes of alkaline wastes was proposed according to the key performance indicators (KPIs) with respect to engineering considerations and environmental impacts. It was concluded that the accelerated carbonation of steelmaking slag should be performed by combining the slurry reactor with a rotating packed bed (RPB) to maximize carbonation conversion and minimize environmental impacts and additional CO2 emissions.

Original languageEnglish
Pages (from-to)892-904
Number of pages13
JournalAerosol and Air Quality Research
Volume14
Issue number3
DOIs
Publication statusPublished - 2014

Fingerprint

Carbonation
Steelmaking
slag
Slags
fixation
Life cycle
life cycle
environmental impact
Environmental impact
Global warming
slurry
sensitivity analysis
global warming
Sensitivity analysis
Slag cement
Basic oxygen converters
Carbon capture
valuation
Steel
Packed beds

Keywords

  • Environmental impacts
  • ReCiPe
  • Rotating packed bed
  • Sensitivity analysis
  • Technology assessment
  • Umberto

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

Cite this

Comparative life cycle assessment (LCA) of accelerated carbonation processes Using Steelmaking Slag for CO2 Fixation. / Xiao, Li Shan; Wang, Run; Chiang, Pen Chi; Pan, Shu Yuan; Guo, Qing Hai; Chang, E. E.

In: Aerosol and Air Quality Research, Vol. 14, No. 3, 2014, p. 892-904.

Research output: Contribution to journalArticle

Xiao, Li Shan ; Wang, Run ; Chiang, Pen Chi ; Pan, Shu Yuan ; Guo, Qing Hai ; Chang, E. E. / Comparative life cycle assessment (LCA) of accelerated carbonation processes Using Steelmaking Slag for CO2 Fixation. In: Aerosol and Air Quality Research. 2014 ; Vol. 14, No. 3. pp. 892-904.
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