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Abstract ZnCl2 and CdCl2×2.5 H2O were chosen to simulate heavy metals in hazardous waste and study the volatile characteristics of zinc and cadmium during co-processing hazardous wastes in blast furnaces. The blast furnace raw materials mixed with ZnCl2 and CdCl2×2.5 H2O were calcined, and the total contents of Zn and Cd in the flue gas and calcined product were analyzed. The results showed that the volatile characteristics of Zn was similar to Cd, and their volatilization ratios increased with the increase of time at the beginning of calcination, but tended to be stable when the calcination time exceeds a certain value. The volatilization ratios of Zn and Cd, when calcinined for 60minutes at 1400℃, were 93.55% and 99.96%, respectively. The volatile rules of Zn and Cd were simulated by chemical reaction kinetic. The apparent activation energy (E) of the volatile reaction of Zn and Cd were 59.37, 49.26kJ/mol, respectively. And the volatile reaction kinetic equations of Zn and Cd were α=f (T, t)=1-exp (-13.60exp (-7141/T) t) and α=f (T, t)=1-exp (-8.35exp (-5925/T)t), respectively.
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Received: 19 February 2015
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