The invention discloses a method and a
system for treating lead and
zinc waste materials. The method comprises the steps of (1)
drying lead and
zinc containing
kiln slags; (2)
grinding dried
kiln slags; (3)
drying zinc leaching slags; (4) mixing fine
kiln slags, dry zinc leaching slags, reducing agents and binders; (5)
pelletizing a mixture, so as to obtain mixed
pellets; (6) supplying the mixed
pellets to a feed area of a rotary
hearth furnace, so that the mixed
pellets pass through a preheating area and a high-temperature area of the rotary
hearth furnace in sequence for reduction, obtained
smoke which contains
indium oxide, zinc
oxide and
lead oxide is discharged from the preheating area, and obtained metallized pellets are discharged from a discharging area; (7) performing ore
grinding and
magnetic separation on the metallized pellets, so as to obtain
metal iron powder and
tailings. According to the method, the comprehensive
recovery and utilization of carbon, iron, lead, zinc and
indium in the zinc leaching slags and the lead and zinc containing kiln slags can be realized, the volatilization rate of lead, zinc and
indium can reach more than 98%, and the
recovery rate of iron can reach more than 90%.