Process for the treatment of steel slag and iron substrates to obtain crude iron and environmentally compatible slag

摘要

Invention Patent: B "PROCESS FOR THE TREATMENT OF STEEL SLAG AND IRON SUBSTRATES FOR THE OBTAINING OF CRUDE IRON AND SLOTS COMPATIBLE WITH THE ENVIRONMENT" D. With a process for the treatment of steel slag and iron substrates, such as, for example, slag from converter, slag from converter, fine ores, powders from the preparation of steel, scales from roller mills to obtain crude iron and environmentally compatible slag, the proportion by volume of molten slag with respect to iron bath is chosen greater than 0.5 to 1, preferably 0.8: 1 to 1.5: 1, and SiO ~ 2 ~ substrates are added to the slag, such as, for example, foundry sands, metallurgical sands and / or fine ores, to adjust a slag basicity (CaO / SiO ~ 2 ~) between 1 , 0 and 1.8 preferably between 1.2 and 1.8, with an Al ~ 2 ~ O ~ 3 ~ content between 10 and 25% by weight, with respect to slag. In this case, air and coal jets are inflated, possibly with inert gas, especially with nitrogen and in addition, eventually, oxygen or hot air is permeated by the iron bath.