From steel industry slag to raw material for low-carbon cement-replacing binders: Raahe slag processing plant opened

(For customers.) The world's first plant has been inaugurated in Raahe to obtain a raw material that reduces emissions from a difficult side stream of steel production. Saint-Gobain held the official inauguration of the slag processing plant in early September 2025. The plant is located right next to SSAB's steel mill, so the side stream of the steel mill can be utilized very close by, and the material does not have to be transported long distances to the processing processes. The slag processing plant processes steel industry slag into an even lower-carbon, alternative raw material to replace special cement as a binder for dry products. Slag is created as a by-product of steel production. It is formed during the processing of molten steel in a blast furnace. Patented technology for slag Slag is difficult to process. It cannot be granulated like blast furnace slag. The new slag processing plant is the result of extensive research and development work. Saint-Gobain has developed a completely new processing technology, which includes three new, approved patents. The Raahe plant processes approximately 70 tons of slag annually. Approximately 000 tons of final, processed slag powder is produced as a cement substitute. The plant sorts the slag and separates the metal, which is recycled back into steel production. The processed slag will replace specialty cements in Saint-Gobain's Weber dry products. In the first phase, the raw material will be used at Weber's plants in Oulu and Kiikala and at the Vingåker plant in Sweden. Half of the emissions eliminated Alternative...