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http://dx.doi.org/10.12925/jkocs.2010.27.2.16

The Study on the Recovery Process of Zinc Metal from EAF Dust by Chemical Treatment  

Jeong, Rae-Youn (Department of Chemical Engineering, Seoul National University of Technology)
Lee, Jin-Hui (Department of Chemical Engineering, Seoul National University of Technology)
Publication Information
Journal of the Korean Applied Science and Technology / v.27, no.2, 2010 , pp. 208-215 More about this Journal
Abstract
EAF dust which is contained around 30% of zinc, 15% of iron and 3% of lead individually, is chemically treated by ammonium chloride, ammonia water, ammonia gas and carbon dioxide, and also tested and identified the ratios of the recovery of In by applied the variations of particle size, pH and heating temperature as well, in order to getting optimized recovery of the In metal after performing all of those processes. Experimental results showed that the rate of Zn recovery is 97% when the mixture of 1.3 of $NH_4Cl$/EAF is heated to the temperature of $400^{\circ}C$ and leached by water, and 95% recovery of In when ammonia gas and carbon dioxide is added simultaneously and adjust the 9.5 of pH to the same mixture above. For the purpose of remove the impurities in the mixed sample, which is prepared by the two samples, indicated above showing as the ratio of 95% and 97% recovery, in case of applied the cementation process to it, and also by electrolytic process, produced the In plate of 95~97%, and acquired 99-99.5% of In metal ingot finally by applied the heating process at $470{\sim}500^{\circ}C$.
Keywords
EAF dust; Zn recovery; chemical leaching; Zn metal; cementation;
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