Title

Sequestration of CO2 from Steelmaking Offgas by Carbonate Formation with Slag

Abstract

The alkaline earth-containing phases in steelmaking slag can form carbonates thus sequestering carbon dioxide from the surrounding atmosphere. Work has been undertaken to improve the carbonate formation kinetics, enabling steelmakers to directly remove CO2 from furnace offgas with slag, which in turn reduces the slag stabilization time. A study of basic oxygen furnace (BOF) and electric arc furnace (EAF) slags is reported in conjunction with their carbonate formation thermodynamics and capacities, yielding an overall slag CO2 capture potential. Preliminary results are presented from bench-top “wet” and “dry” slag carbonation tests on industrial slags using a slurry reactor and large-scale thermogravimetric analysis (TGA).

Department(s)

Materials Science and Engineering

Sponsor(s)

American Iron and Steel Institute
Dofasco
Gallatin Steel
Hylsa
IPSCO Inc.
Mittal Steel Company
Nucor Corporation
Praxair, Inc.
Timken Company
United States. Department of Energy
United States Steel Corporation

Keywords and Phrases

Carbon Dioxide; Metallurgy; Phase Stability; Reaction Kinetics; Steelmaking Slag

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 Association for Iron & Steel Technology (AIST), All rights reserved.

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