Abstract:Chemical thermal equilibrium analysis method was adopted to study morphology and distribution of trace elements of mercury in sintering process with Factsage 7.0. The results show that mercury exists in form of bivalence in low temperature region, and 99% of mercury exists in form of elementary substance in high temperature zone. Chlorine is the main effecting element on mercury oxidation. With existence of chlorine element, mercury exists in form of mercuric chloride under temperature of 800 K below, elementary substance and bivalence mercury compete at 850 K, while most of mercury exists in form of elementary substance under temperature of 900 K above. Compared with chlorine, sulfur and oxygen have weak oxidation capability on mercury. Change of content of Cl, S, and O will change the existing temperature interval of bivalence mercury.