steelworks around the world emitting huge amounts of carbon dioxide,
scientists are reporting that a byproduct of steel production could be
used to absorb that greenhouse gas to help control global warming. The
study is scheduled for the October 15 issue of ACS’ Industrial & Engineering Chemistry Research, a bi-weekly journal.
Professor Mourad Kharoune and colleagues point out that production of one ton of steel releases up to one ton of CO2.
With global steel production standing at 1.34 billion tons in 2007,
that adds up to a substantial contribution of carbon dioxide. Kharoune
suggests a new method to sequester, or capture, carbon dioxide so that
it does not contribute to global warming – using steel slags, which are
complex mixtures of compounds produced during the separation of the
molten steel from impurities.
In the study, Kharoune suggests that electric arc furnace (EAF) and
ladle furnace (LF) slag suspensions could be used for greenhouse-gas
sequestration. According to the report, the ladle furnace slag
suspension’s capacity to sequester emissions was 14 times higher than
that of the EAF suspension, possibly due to the LF’s higher content of
a rare mineral called portlandite.
Source: A news release from American Chemical Society on October 7, 2008.