This work is related to an alternative chemical treatment of an electric furnace dust. The residue containing 29 percent of Fe and 16 percent of Zn, most of it in a zinc ferrite (ZnFeO4) structure, was submitted to chlorine containing reagents. The main idea was to separate the zinc from the iron through a selective chloride formation of the former followed by its volatilization. In this case, the residue, without the zinc presence, could be reused in the industrial plant, minimizing the environmental impact. Some characterization analyze methods was used as Xray diffraction, scanning electronic microscopy, diffraction and X-ray fluorescence and mass spectroscopy (ICP-MS). The zinc observed in the sample was present as zinc ferrite (franklinite). Preliminary thermodynamics studies have shown that chlorine and calcium chloride roasting could act selectively on the residue, then producing the volatile zinc chloride and leaving behind the iron oxide. Experimental work has proved that possibility showing that when the reaction happened at 1100 degrees Celsius, with 40 percent the reagents excess, for 30 minutes, the iron content increase slowly (with 21 percent removed) while that the zinc conten decrease the 16 to 1 percent (94 percent removed), proposing complementaries studies to optimize the selectivity.