Three types of electric arc furnace dusts (with zinc oxide contents at 10, 22 and 37 percent wt.) and one basic oxygen furnace dust (with zinc oxide content 2.1 percent wt.) were treated in a bench scale LB furnace. Steelmaking dusts were mixed with pulverized coal (various amounts of crushed mill scale were also added to raise the bulk density of the mixture) reduced in the reducing chamber to produce lumpy sponge which dropped by gravity to the melting chamber. In general. 20 percent wt of coal in the mixture is adequate to complete substantially the reduction All CO, H_2 and zinc and lead vapours were burned in the combustion chamber to provide the heat requirements to produce sponge at 1000 C. The melting chamber is heated by plasma. Slags and liquid metal made from LB Furnace reduction contain very low amounts of zinc and lead, often at detecting limits of analytical instruments. Zinc and lead oxides in LB Furnace dusts increases with the increase of their contents in the feed materials.
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