Description
Certain steel mill wastes contain significant amounts of zinc oxide due to the use of galvanized scrap during the steel making process. Typically electric arc furnace (EM), and basic oxygen process (BOP) flue dusts contain 20 to 30% zinc oxide and 40 to 50% iron oxides, along with smaller quantities of lead and cadmium. These materials can be recovered fiom the flue dusts by using a proven rotary hearth h c e (RHF) process. By-products of the recycling operation include a crude zinc oxide fume, which is captured in a baghouse filtering system, and sponge iron that may be recycled into the steel making operation. Crude zinc oxide properties plus the operating experience fiorn two commercial RHF installations utilizing MR&E's DRyIron^TM Process will be presented.