Abstract
The behavior of mercury under conditions similar to a wet flue gas cleaning process has been discussed in terms of thermodynamic equilibrium. The spectrophotometric technique developed in this laboratory has been used to study the systems HgCl{sub 2} + HCl + H{sub 2}O, HgCl{sub 2} + CaCl{sub 2} + H{sub 2}O, and SO{sub 2} + HgCl{sub 2} + HCl + H{sub 2}O at 50 C and atmospheric pressure in the absence of oxygen. A thermodynamic model presented in earlier communications is developed further. The substance-specific data required were extracted from literature and used without any further adjustment. The experimental results show that the soluble bivalent mercury (HgCl{sub 2}) is completely reduced to elemental insoluble form through sulfur dioxide, even in the presence of 0.1 M HCl (i.e., also in strongly acidic solutions). This is also confirmed by the calculations done with the thermodynamic model.
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