《Table 5–Literature summary about the effects of chlorides on the evaporation of heavy metals.》

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《Review on fate of chlorine during thermal processing of solid wastes》

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Previous research（Table 5）reveals that the increase of Cl content from either organic chlorides（e.g.，PVC）or inorganic chlorides（e.g.，NaCl，KCl，CaCl2and FeCl3）will increase the amount of most of heavy metals（e.g.，Cd，Zn，Cr，Cu）partitioned in the fly ash by the formation of easily evaporated chlorides.These heavy metal chlorides，which can be formed through direct chlorination and indirect chlorination mechanisms，have higher vapor pressures than corresponding oxides.For indirect chlorination，chlorides firstly form HCl and/or Cl2by reacting with H2O and/or O2（Eqs. （8）–（9）） .The generated HCl or Cl2then react with heavy metals or heavy metal oxides to form chlorides（Eqs. （6）–（7）） .The direct chlorination converts the heavy metal oxides（MO）into chlorides（MCl2）by Eq.（12）（Jakob et al.，1996） .