MERCURY IMMOBILIZATION IN CIRCULATING HOK CA(OH)(2)-PARTICLES/

Citation
G. Ewert et al., MERCURY IMMOBILIZATION IN CIRCULATING HOK CA(OH)(2)-PARTICLES/, Gefahrstoffe, Reinhaltung der Luft, 57(1), 1997, pp. 15-18
Citations number
7
Categorie Soggetti
Environmental Sciences","Engineering, Civil","Engineering, Environmental
ISSN journal
09498036
Volume
57
Issue
1
Year of publication
1997
Pages
15 - 18
Database
ISI
SICI code
0949-8036(1997)57:1<15:MIICHC>2.0.ZU;2-7
Abstract
An experiment was performed by placing HOK-(coke)/Ca (OH)(2)-particles in a circulating fluidized bed reactor. Defined model waste gases con taining HCl/SO2/Hg-0/Hg2+ were fed through the reactor. Fundamental in vestigations were made to discover absorption of Hg-0 and Hg2+. Major influences in exhaust gas cleanings such as the mercury content of the gas, the temperature and the HCl/SO2 influence were taken into consid eration. The results were not as expected because when all the factors (mentioned above) were varied in the investigated field were no defin ed effects. The reason could be the short time of the gas-solid-contac t was present in the circulating fluidized bed reactor (< 1 s) and the mercury desorption beginning at an approximate temperature of 100 deg rees C. This might have led to the reduction in mercury immobilisation . The experiments showed the following: When coke and mercury were pre sent in the reactor a marked increase in the absorptive removal of HCl /SO2. Because of the coke the chemisorption processes were catalysed a nd accelerated.