Abstract
Hg2+ ions in water are reduced to metalic mercury and vaporized in the Ferrite treatment, which is an oxidation reaction of ferrous and heavy metal hydroxide by aeration. But the behavior of mercury is not known in detail.
In this paper, condition of Hg2+ reduction, the rate of metalic mercury volatilization from water, merucury concentration of filtrate and the dissolution of mercury from magnetite suspension at pH 1-7 were studied in the oxidation of Fe (OH)2 suspension contained HgCl2 5-20mg·l-1 by aeration at 45-75°C.
The suitable condition for reducing Hg2+ ions to metalic mercury was initial pH≥9 and Fe2+/Hg2+ (mol/mol)≥50.
The rate of metalic mercury volatilization was controlled by the reaction temperature and the condition of aeration, and the volatilization rate equation was obtained. We found that mass transfer coefficient of mercury, KLa-Hg, was proportional to (KLa-O2)1.5.
