A HYDROMETALLURGICAL SEPARATION PROCESS OF STEEL MILL ELECTRIC ARC FURNACE(EAF) DUST AND THE PIGMENTS OBTAINED BY THE PROCESS

摘要

a) washing the EAF dust n dissolve soluble salts, metals and simple oxides contained in the dust, said washing step being performed under agitation ar alkaline pH; b) decanting the solution of step a) to obtain a supernatant liquid containing the dissolve salts, metals and sim| and a slurry containing fcrriles and magnetites, a non toxic amount of leachable lead and a reduced amount of calcium; c) s the slurry and the supernatant liquid; d) adding to the slurry obtained in step c) an anionic surfactant to disperse the ferriu adsorbed on the magnetite particles; and c) treating the slurry from step d) to produce pigments selected from the group of ferrite pigments, magnetite pigments and fcrrite/magnctite pigments