Diamond blade produces smoother slabs, but presents greater problems of linearity, especially in the case of very hard rocks.The magnetic fraction includes metals covered by the European Union CRM (Critical Raw Material), so their recovery is essential.The technology with diamond wire seems to be the best, both for slabs productivity and for the low percentage of metals in the sludge that can be recycled as it is. Instead, the sludge produced with the frame saw technology has high percentages of Cr, Ni, and Cu, requiring magnetic separation before its reuse.In this way it is possible to obtain two fractions that can be recovered separately.