The use of cement kiln dust for the removal of heavy metal ions from aqueous solutions

Authors: Pigaga, A.; Juškenas, R.; Virbalytė, D.; Klimantavičiūtė, M. G.; Pakštas, V.

Source: Transactions of the Institute of Metal Finishing, Volume 83, Number 4, August 2005 , pp. 210-214(5)

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Abstract:

The possibility of removal and utilisation of heavy metal (HM) ions from aqueous solutions by cement kiln dust (CKD) has been studied. The experiments have shown that CKD may be used for industrial wastewater decontamination. They revealed that CKD may be used for neutralisation of acidic wastewaters (alkalinity 12–16 meq g^?1) and for removal of HM ions such as Cu(II), Ni(II), Pb(II), Cd(II) and Co(II). CKD acts as an alkaline agent and sorbent. The main crystalline components of CKD are: calcite, CaCO₃ (80% by mass), 10–15% SiO₂ and the remainder is basic calcium silicate, Ca₅(SiO₄)₂(OH)₂. The maximal capacity of CKD to remove Cu(II) is 0·29 g g^?1 CKD (9·1 meq g?1); Ni(II), 0·14 g g^?1 CKD (4·7 meq g^?1); Pb(II), 2·0 g g^?1 CKD (19 meq g^?1); Cd(II), 0·42 g g^?1 CKD (7·4 meq g^?1); and Co(II), 0·20 g g^?1 CKD (6·8 meq g^?1). Interaction of CKD with Cu(II) ions produces devillite Cu₄(CaSO₄)₂(OH)₆·3H₂O, with Pb(II) – basic carbonate Pb₃(CO₃)₂(OH)₂ and with Cd(II) ions – Cd(OH)Cl. The products of interaction of CKD with Ni(II) and Co(II) ions are amorphous: apparently hydrated Ni(OH)₂ and Co(OH)₂.

Keywords: DECONTAMINATION; HEAVY METALS; WASTE MANAGEMENT; CEMENT KILN DUST; AQUEOUS SOLUTIONS

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/002029605X61685

Publication date: 2005-08-01

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