Adsorption characteristics of blast furnace flue dust for up take of Cu(II) and Pb(II) ions from aqueous solutions

B. Das, S. Prakash*, P.S.R. Reddy, S.K. Biswal and V.N. Misra

Regional Research Laboratory (Council of Scientific and Industrial Research)
Bhubaneswar, 751013, Orissa, India

Accepted 12 April 2005


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.

Keywords: Blast furnace flue dust,; Characterization, Adsorption, Metal ions

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   E-mail : inbhattacharya@rrlbhu.res.in