Loesche is to continue development of processes to condition steel slag for use as an alternative cementitious material, following the conclusion of a legal dispute over ownership of the technology.
In contrast to granulated blastfurnace slag, original steel slag shows no appreciable binding behaviour after normal finish grinding. As a result, it has not previously been used in cement. Some has been recycled in road construction – but a significant portion is also sent to landfill.
To decrease the amount of steel slag sent to landfill, Loesche has developed two procedures for conditioning the slag: a slow cooling method and fast cooling method. The individual stages of the procedures have been tried and tested on an industrial scale.
Development of the technology was paused however, after a lawsuit was brought against Loesche by the Bundesanstalt für Materialforschung and –prüfung (BAM), represented by the Federal Republic of Germany.
In December 2017, that legal dispute was decided in Loesche’s favour, with the court awarding full ownership of the fast-cooling method to Loesche, which is considered to be the more economical procedure due to possibility for waste-heat recovery. Ownership of a third of the slow-cooling method was granted by the court to BAM.
“In the coming years the aim will be to successfully implement the procedure into industrial practice,” Loesche said in a press release.
Read the article online at: https://www.worldcement.com/europe-cis/25062018/loesche-to-continue-development-of-slag-conditioning-technology/