DBPapers
DOI: 10.5593/SGEM2015/B41/S18.106

SUSCEPTIBILITY OF MAIN MINERAL PHASES OF STEEL SLAGS TOWARDS MINERAL CARBONATION AND CALCIUM LEACHING

M. Bodor, R. M. Santos, T. Van Gerven
Monday 28 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-38-4 / ISSN 1314-2704, June 18-24, 2015, Book4, 817-826 pp

ABSTRACT
In the future, steel slags could be used in mineral carbonation processes at an industrial scale if an economic method is found. For this goal to be achieved, an important aspect of the process should be first well understood, namely susceptibility of steel slag mineral compounds towards carbonation. The behaviour, during mineral carbonation, of seven of the most abundant minerals found in the composition of AOD, CC and BOF slags (åkermanite (Ca2MgSi2O7), bredigite (Ca7MgSi4O16), cuspidine (Ca4Si2O7F2), β– and γ–C2S (Ca2SiO4), merwinite (Ca3MgSi2O8), and srebrodolskite (Ca2Fe2O5)) was previously reported, and this paper further investigates why different alkaline minerals have different carbonation susceptibility. To this end, six of the synthesized minerals were leached using sodium chloride, magnesium chloride and hydrochloric acid solutions. The results showed that mild leachants are good predictors of carbonation kinetics, while strong leachants are good predictors of maximal carbonation conversion.

Keywords: mineral carbonation, mineral synthesis, steel slags, crystallography, leaching

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