Valorisation of metallurgical residues via carbothermal reduction: A circular economy approach in the cement and iron and steel industry
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In: Waste management & research, Vol. 42.2024, No. ??? Stand: 22. April 2024, 07.04.2024, p. 1-9.
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TY - JOUR
T1 - Valorisation of metallurgical residues via carbothermal reduction
T2 - A circular economy approach in the cement and iron and steel industry
AU - Krammer, Anna
AU - Doschek-Held, Klaus
AU - Steindl, Florian Roman
AU - Weisser, Katharina
AU - Gatschlhofer, Christoph
AU - Juhart, Joachim
AU - Wohlmuth, Dominik
AU - Sorger, Christoph
N1 - Publisher Copyright: © The Author(s) 2024.
PY - 2024/4/7
Y1 - 2024/4/7
N2 - The decarbonisation of the steel and cement industry is of utmost importance in tackling climate change. Hence, steel production in modern integrated steel mills will be shifted towards electric arc furnaces in the future, in turn causing dwindling supplies of blast furnace slag, which is used as a supplementary cementitious material inter alia to reduce the CO2 emissions of cement production. Achieving a sustainable circular steel and building material economy requires the valorisation of currently landfilled steel slags and investigating utilisation options for electric arc furnace slag, which is increasingly being generated. For this purpose, different metallurgical residues and by-products were treated by carbothermal reduction in an inductively heated graphite crucible and then rapidly cooled by wet granulation, yielding a slag fraction similar to granulated blast furnace slag and a metal fraction valuable as a secondary raw material. A spreadsheet-based model was developed to calculate residue combinations to accomplish target compositions of the slag and metal fractions to fulfil previously identified requirements of the targeted cementitious and ferrous products. The results demonstrate the high accuracy of the model in predicting the properties (e.g. main oxide composition) of the generated slag and metal fraction, which fulfil the needed requirements for their use as (i) a supplementary cementitious material and (ii) a secondary raw material in steel production.
AB - The decarbonisation of the steel and cement industry is of utmost importance in tackling climate change. Hence, steel production in modern integrated steel mills will be shifted towards electric arc furnaces in the future, in turn causing dwindling supplies of blast furnace slag, which is used as a supplementary cementitious material inter alia to reduce the CO2 emissions of cement production. Achieving a sustainable circular steel and building material economy requires the valorisation of currently landfilled steel slags and investigating utilisation options for electric arc furnace slag, which is increasingly being generated. For this purpose, different metallurgical residues and by-products were treated by carbothermal reduction in an inductively heated graphite crucible and then rapidly cooled by wet granulation, yielding a slag fraction similar to granulated blast furnace slag and a metal fraction valuable as a secondary raw material. A spreadsheet-based model was developed to calculate residue combinations to accomplish target compositions of the slag and metal fractions to fulfil previously identified requirements of the targeted cementitious and ferrous products. The results demonstrate the high accuracy of the model in predicting the properties (e.g. main oxide composition) of the generated slag and metal fraction, which fulfil the needed requirements for their use as (i) a supplementary cementitious material and (ii) a secondary raw material in steel production.
KW - carbothermal reduction
KW - circular economy
KW - CO-reduced cement
KW - industrial residue
KW - metal recovery
KW - metallurgical residues
KW - steel slags
KW - Supplementary cementitious material
UR - http://www.scopus.com/inward/record.url?scp=85190404450&partnerID=8YFLogxK
U2 - 10.1177/0734242X241240040
DO - 10.1177/0734242X241240040
M3 - Article
C2 - 38584402
AN - SCOPUS:85190404450
VL - 42.2024
SP - 1
EP - 9
JO - Waste management & research
JF - Waste management & research
SN - 0734-242X
IS - ??? Stand: 22. April 2024
ER -