C. Samuelsson et G. Carlsson, A qualitative study on the retention of mercury from SO2-containing process gases on copper smelter dusts, CAN METAL Q, 40(2), 2001, pp. 161-168
Mercury present in process gases can to some extent be removed in dust filt
ers such as textile bag house filters. The removal efficiency in such filte
rs is dependent on gas composition, gas temperature and properties of dust
particles collected in the filter. In the present study, laboratory scale e
xperiments were conducted to study qualitatively the influence of different
types of dusts on the retention of mercury in SO2-containing gases. A gas
mixture composed of N-2, SO2, O-2 and Hg was passed through a textile filte
r covered with dust, Two different types of dust were used in the experimen
ts: one dust containing mainly Cu- and Fe-sulphides and Fe-oxides and one c
ontaining mainly Cu-, Fe, and Zn-oxides and -sulphates, The dusts were stud
ied using microprobe equipment after exposure to the mercury-containing gas
, Thermodynamic calculations were carried out for comparison with the exper
imental results. The study shows that mercury is mainly associated with par
tially roasted chalcopyrite particles.