文章基本信息

标题：Inertization of lead by using blended cement pastes
本地全文：下载
作者：Eisa E. Hekal ; Essam A. Kishar ; Maha R. Mohamed 等
期刊名称：HBRC Journal
印刷版ISSN：1687-4048
出版年度：2012
卷号：8
期号：3
页码：153-158
DOI：10.1016/j.hbrcj.2012.10.001
语种：English
出版社：Elsevier
摘要：AbstractInertization of lead nitrate Pb(NO3)2, a representative of soluble lead compound, with five cements pastes based on either ordinary Portland cement (OPC) or blended Portland cement with granulated blast-furnace slag (GBFS) or metakaolin (MK) was studied. Various mixes were prepared by using a water/solid ratio (W/S) of 0.28 (by weight). Two ratios of Pb ions (1.0% and 2.0% of the solid binder) was used by adding to the mixing water. Hydration characteristics of the different cement pastes were investigated via the examination of chemically combined water content, compressive strength, X-ray diffraction analysis and thermal analysis (DTA/TGA). Leaching of lead ions from various hardened cement pastes was examined. The results showed that lead nitrate retards cement hydration through the formation of plumbate salt CaPbO3. The obtained results of leaching showed a high degree of immobilization of Pb ions in the various cement pastes. Moreover, partial replacement of Portland cement by MK is more efficient than granulated blast-furnace slag GBFS.
关键词：KeywordsSolidification/stabilizationInertizationCement hydrationLead nitrate