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Shvoong Home>Science>Thermodynamic Calculation on Chlorinating Treatment for EAF Dust with FeCl_2 Summary

Thermodynamic Calculation on Chlorinating Treatment for EAF Dust with FeCl_2

Article Summary   by:TsingHua     Original Author: Journal of Chongqing University(Natural Science Edition)
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The dusts generated from steelmaking by electric arc furnace (EAF) have abundant contents of toxic elements as Zn, Pb and Cd, etc.. Simple disposal or landfill of EAF dust can lead to the heavy pollution of environment because of the soaking out of Pb and Cd. While directly recycling of such dusts in iron and steel plants, the enrichment of Zn in blast furnace may shorten the usage life of line refractory bricks, the transfer of such toxic elements can even deteriorate the steel quality and grades. In order to avoid the environmental pollution by EAF dust and realize the comprehensive usage of EAF dust, a new efficient and low-cost method should be applied to remove the abundant harmful Pb, Zn, Cd and other elements in such dust. On the basis of thermodynamic calculation, it has been analyzed that FeCl 2 can be used to remove Zn and Pb from EAF dust. Some comparisons were also put on the chlorinating effects under different reaction conditions. The results from calculation showed that ZnO, ZnFe 2O 4, CuO, PbO and CdO in dusts can almost be transformed perfectly into gaseous chlorides at 600~900 ℃. For the dusts with high contents of CaO, the addition of SiO2 is beneficial to promote the removing efficiency of toxic elements,the removal ratio of Zn in EAF dust reached 96%~98%. But the removal ratio of Zn demonstrates a decreasing tendency when reacting temperature exceeds 950 ℃.
Published: June 30, 2003   
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