Leaching of metals from cement under simulated environmental conditions

Journal of Environmental Management
Huixia LuJohn P Giesy

Abstract

Leaching of metals from cement under various environmental conditions was measured to evaluate their environmental safety. A cement product containing clinker, which was produced from cement kiln co-processing of hazardous wastes, was solidified and leaching of metals was characterized using the 8-period test. Concentrations and speciation of metals in cements were determined. Effects of ambient environment and particle size on leachability of metals and mineralogical phases of cement mortars were evaluated by use of XRD and SEM. Results indicated that metals in cements were leachable in various media in descending order of: sea water, groundwater and acid rain. Cr, Ni, As, Co and V were leached by simulated sea water, while Cu, Cd, Pb, Zn, Mn, Sb and Tl were not leached in simulated sea water, groundwater or acid rain. When exposed to simulated acid rain or groundwater, amounts of Cr, Ni, As and V leached was inversely proportional to particle size of cement mortar. According to the one-dimensional diffusion equation, Cr was most leachable and the cumulative leached mass was predicted to be 9.6 mg kg(-1) after 20 years. Results of this study are useful in predicting releases of metals from cement products containing ash and cl...Continue Reading

References

May 20, 2011·Journal of Hazardous Materials·Suthatip SinyoungPuangrat Kajitvichyanukul
Mar 19, 2014·Journal of Hazardous Materials·Yan-Jun DuFei Jin

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Citations

Apr 25, 2018·International Journal of Environmental Research and Public Health·Adriana EstokovaMaria Kanuchova
Feb 20, 2018·Environmental Science and Pollution Research International·Zhenzhou YangZuotai Zhang
Feb 6, 2020·International Journal of Environmental Research and Public Health·Yixuan YangHaiyan Li

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