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Environmental Engineering Research 2004;9(3): 103-112. DOI: https://doi.org/10.4491/eer.2004.9.3.103
LEACHABILITY OF PB-DOPED SOLIDIFIED WASTE FORMS USING PORTLAND CEMENT AND CALCITE: I. INVESTIGATION OF X-RAY DIFFRACTION
Dongjin Lee
School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
Corresponding Author: Dongjin Lee ,Tel: +61-2-9385-5562, Fax: +61-2-9385-6139, Email: dongj7@empal.com
Received: November 10, 2003;  Accepted: April 10, 2004.
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ABSTRACT
This study is investigated to assess teachability of Pb-doped solidified waste forms using Portland cement and calcite. X-ray diffraction was used for identification of mineral transformations occurring on the solidified waste materials formed during the leaching process. Particular attention is given to the leaching effects of calcite (CaCCb) in the solidification/stabilization of lead. Rapid diffusion/dissolution of lead substances (KP10) at the attack of acid is mainly related to lead precipitates located in larger pores (capillary pores) and their openness in cavities. Calcite-added lead contaminated material (KC5P10) including almost no lead precipitates makes slow diffusion/dissolution of lead, which occurs in the structure of calcium lead silicate (sulfate) hydroxide (C-Pb-S-H). On the other hand, additional calcite on lead contaminated materials (KC10P10) including even a lot of lead precipitates in cavity areas such as KP10 are presumably very resistant to acid attack because enhanced calcium-silicate-hydrate (C-S-H) due to accelerating effect of calcite strongly encapsulates/protects even portlandite as well as lead precipitates, which not much dissolves even up to the 5* leach.
Keywords: Solidification/stabilization (S/S) | Calcite; Lead | X-ray diffraction | Leachability
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