Abstract: Dyestuff residue, a type of hazardous waste, is incinerated in the
tubular furnace, and thermodynamic equilibrium model is used to calculate and
analyze the chlorine behavior. The HCl emission and its effects on the
behaviors of heavy metals are studied. Meanwhile, the effects of three
dechlorine reagents are predicted at a high temperature. Results show that HCl
emission is dependent on incineration temperature. The HCl evaporated mainly
derives from the organic chlorine. Under the working condition of
500–900°C, the main products of Hg, Pb, Cu, Ni, Zn, and Mn in
reaction with HCl are HgCl_2(g),
PbCl_4(g), PbCl_2(g),
(CuCl)_3(g), NiCl_2(s),
NiCl_2(g), ZnCl_2(s),
ZnCl_2(g), Zn(g), MnCl_2(s), and
MnCl_2(g), respectively. Among the three dechlorine
reagents, CaCO_3 is optimal to remove chlorine at high
temperature, little of HCl is released below 800°C, whereas
Fe_3O_4 is unstable at high
temperature.
