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Adsorption characteristics of
blast furnace flue dust for up take of Cu(II) and Pb(II) ions from aqueous
solutions
The feasibility of utilizing blast furnace flue dust, a solid waste material
generated at steel plants, has been studied for the removal of Cu(II) and Pb(II)
ions from aqueous solution. The blast furnace flue dust sample was
characterized with respect to physico-chemical and petrographic studies. The
sample contains 29.9% carbon, 35.7% Fe (T) and 0.35% metallic iron. The
qualitative optical emission study indicates the presence of various
alkaline, transition and rare earth elements. The sample also contains
disseminated grains of carbon, sinter grain secondary hematite and clusters
of gelignite crystallites. The adsorption of metal ions from the aqueous
solution is mainly due to the presence of phases like carbon, metallic iron,
iron oxides and alumino silicates and smaller entrapped hollow spheres in
blast furnace flue dust. The influence of contact time, amount of adsorbent,
concentration of metal ions and temperature has been studied. The adsorption
was found to be more at higher dosages of adsorbent due to increased number
of adsorption sites and at higher contact time. The process exhibits both
Freundlich and Langmuir adsorptions isotherms and the adsorption of metal
ions has been found more at higher temperature. It is also observed that
adsorption of Cu(II) ions is more compared to Pb(II) ions. |
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