Analytical note for the cement and metallurgical sectors
ArcelorMittal has announced construction of a lower‑emission electric arc furnace (EAF) in Dunkirk as part of its decarbonisation and modernization strategy. This move has direct implications for by‑products of blast‑furnace operations — notably Air‑cooled Blast Furnace Slag (ACS) and Granulated Blast Furnace Slag (GBFS). Details of the project are available in the Reuters report.
Shift to EAF and pressure on GBFS
The wider adoption of electric arc furnaces and Direct Reduced Iron (DRI) technologies reduces reliance on traditional blast‑furnace routes. Because GBFS is produced through blast‑furnace smelting followed by slag granulation, a large‑scale shift to EAF/DRI can lower the volumes of available granulated slag. GBFS is a valued supplementary cementitious material (SCM) used to reduce clinker content and CO₂ emissions in cement; its scarcity increases competition among cement producers, exerts upward pressure on prices, and heightens import dependence.
ACS relative stability with caveats
ACS — air‑cooled blast‑furnace slag — is less dependent on granulation processes and is commonly used as an aggregate in road construction. Even if blast‑furnace throughput declines, ACS may remain relatively available in regions where blast furnaces continue to operate. Nevertheless, long‑term supply stability will depend on the pace of blast‑furnace closures or conversions.
Practical market consequences
- Cement producers: accelerated need to diversify SCM sources and adjust cement formulations.
- Road contractors: ACS remains a reliable material, but logistics and local stockpiles gain strategic importance.
- Supply chains: increased role for imports and flexible logistics to cover GBFS shortfalls.
Conclusion
ArcelorMittal’s Dunkirk project signals a structural transformation in European steelmaking. For the cement industry this means ACS retains practical value for infrastructure, while GBFS may become a scarcer, strategically important resource requiring adaptation in formulations, procurement and logistics. Source: Reuters.