Process for the conversion of iron bearing residues into a synthetic rock

Process for the conversion of iron bearing residues from the non-ferrous process industry into a synthetic rock, comprising the steps of:

• preparing a mixture consisting essentially of 1 part of wet iron bearing residue from the non-ferrous process industry mixed with at least 0.1 parts by weight of crushed blast furnace slags and with at least 0.1 parts by weight of crushed converter slags;
• adding water to the mixture to obtain a stiff paste;
• and
• allowing the past to harden, while keeping the paste wet, to such an extent that the resulting rock is usable for construction purposes.