| 摘要 |
<p>The invention relates to a method for transforming slag derived from non-iron metallurgy, especially of primary and secondary Ni and Cu foamed slags while recovering and/or enriching the non-iron metals and constructing synthetic puzzolans. The liquid oxidic slags are reduced in a first reduction step by means of a metal bath, said bath containing Cu and/or Ni and optionally Co, with gases, e.g. cracked gas, which contain H2 and CO. The redox potential of the CO/H2 mixture is reduced by adding 10 to 40 vol. % H2O vapor and/or CO2 in order to prevent the reduction of Fe oxides. Afterwards, the remaining slag which is free of Cu and Ni is subsequently reduced by means of an iron bed while using carbon to reduce the Fe oxide portion in order to produce a slag which is free of Fe and nonferrous heavy metals.</p> |
