An investigation of mercury solidification and stabilization in portland cement using X-ray photoelectron spectroscopy and energy dispersive spectroscopy

Immobilisation of heavy metal in cement-based solidification/stabilisation: A review

“…The incorporation of heavy metals results in a decrease of the Ca(OH) 2 content of the cement paste and increases its vulnerability to carbonation and acidic corrosion (Chen and Wu, 2000;Chen, 2004). McWhinney et al (1990), McWhinney and Cocke (1993) have studied the solidification of metal ion pollutants, namely Ba, Zn, Cr, Pb, Cd, and Hg, and noted that the carbonation degree was greater for the zinc, cadmium and mercury-doped cement pastes compared with the control cement paste.…”

Application of accelerated carbonation with a combination of Na2CO3 and CO2 in cement-based solidification/stabilization of heavy metal-bearing sediment

“…Following the USEPA digestion method (that is, acid digestion with concentrated H 2 SO 4 and HNO 3 in excess of K 2 MnO 4 at 96 • C for 2 h), the contents of heavy metals in the sediments were analyzed. The sediments contained (mg/kg) mercury (3)(4)(5)(6)(7)(8)(9)(10)(11)(12), lead (84-166), copper (91-130), nickel (5-27) and zinc (140-450). The filtered sediments were mixed at the same dry weights and then the leaching characteristics of the mixed sediment were quantified based on the Chinese solid waste extraction procedure for leaching toxicitysulfuric acid and nitric acid method (HJ/T299-2007).…”

“…Carbonation neutralizes the alkaline nature of cement-solidified sediments, reduces the solubility of certain heavy metals and represents a significant advantage in terms of environmental protection. McWhinney et al noted that metals such as Ba, Cr, Pb, Cd and Hg promoted cement carbonation in the presence of CO 2 [11,12]. Lange et al reported the beneficial effects of carbonating solidified metal wastes curing in CO 2 .…”

Stabilization/solidification (S/S) of mercury-contaminated hazardous wastes using thiol-functionalized zeolite and Portland cement

“…The conventional S/S technologies, however, cannot effectively reduce the leachability of mercury [4]. It is reported that mercury tends to hydrolyte to form a red precipitate of HgO in Portland cement, but the mercury still has a strong potential to volatilize from cement-solidified sludge [5,6]. It was known that utilizing the combination of the chemical and physical isolation processes can effectively immobilize mercury [7,8].…”