Abstract: There is 8.74% zinc and 27.4% iron in a blast furnace flue dust. Zinc mainly exists in zincite, and iron mainly exists in hematite. To recovery the valuable elements of zinc, sulfuric acid leaching experiment was conducted. Results indicated that, at room temperature, with sulfuric acid concentration is 0.5 mol/L, liquid solid ratio is 6 mL/g, reaction time for 15 min, stirring speed of 300 r/min, zinc leaching rate of 95.21% can be obtained, zinc grade of leaching residual decreased to 0.5%. The results can provide technique basis for sulfate leaching of such kind of blast furnace flue dust.

Key words: Blast furnace flue dust, Sulfuric acid, Leaching, Zinc, Iron