Revealing the tricalcium silicate formation behaviors in modified EAF slag at high temperatures for the production of electric recycled cement

Le résumé fourni par la source

The formation behaviors of tricalcium silicate (C 3 S) in modified EAF slag were investigated to assess the feasibility of using EAF slag for cement clinker production. For the formation conditions of C 3 S, the C 3 S content in slag exhibits a notable increase with elevating slag basicity and reaction time, while only a slight enhancement with temperature rising from 1400 °C to 1500 °C. The C 3 S formation mechanism depends on the local conditions in the slag. In the lime-rich region it primarily takes place through the direct formation, i.e. 3CaO(s) + SiO 2 (l) = 3CaO·SiO 2 (s), controlled by the diffusion of SiO 4 4− in liquid phase. Conversely, in the dicalcium silicate (C 2 S) rich region, C 3 S formation primarily occurs via the indirect formation: 2CaO·SiO 2 (s) + CaO(l) = 3CaO·SiO 2 (s), with the reaction being controlled by the diffusion of Ca 2+ in the liquid slag. • Cement clinker production from modified EAF slags via Cambridge Electric Cement method • Tricalcium silicate (C 3 S) formation conditions and formation mechanisms • Increasing slag basicity and holding time are more conducive to the C 3 S formation than temperature. • Direct formation of C 3 S in lime rich region while indirectly formation in C 2 S rich region

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