| 摘要 |
<p>A pyrometallurgic process for the treatment of post-steelwork residues, typically from Waelz process, comprises: providing a furnace (1) of the electric arc type; preparing the residues, for example in a hopper; introducing the residues, together with suitable additives and chemical reagents including fuel or reductant, into the furnace (1); introducing directly into the slag, by means of lances (4), additives, fluxing and reaction elements to correct the composition of the slag (7); reacting the residues with the slag (7) to obtain: a) separation of the liquid metallic phases; b) separation of the metallic volatile elements in vapour phase which, in the upper zone of the furnace (1), recombine with the oxygen for the formation of solid oxides; c) separation of the stable phases, typically ceramic and/or silicates, which form the inert phase of the slag (7); d) separation and neutralization of other elements risky for the environment present in the residues themselves to make the slag (7) inert; supplying energy by means of an electrode column (5) to the reaction bed or slag (7) to sustain the above reactions; extracting the metallic bath (6) and inert slag (7). <IMAGE></p> |
