The RECOVER KU Leuven team prepared the first dense prototypes, with dimensions 40x40x4 cm, utilizing the Koranel slag from Metallo. The upscaling took place employing the available equipment in SREMat’s upscaling line in Herk-de-Stad, Belgium. The slag was milled employing the small capacity attritor and the mortars were prepared in a HOBART mixer. Finally, the dense blocks were pressed in a semi-automatic rotational press.