Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China

Beijing, China

Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China

Beijing, China

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Song M.,Tsinghua University | Song M.,Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China | Liu J.,Tsinghua University | Liu J.,Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China | And 2 more authors.
Journal of Material Cycles and Waste Management | Year: 2014

With the air pollution control standards getting increasingly stricter, gas cleaning processes with higher capture efficiency of pollutants in iron-ore sintering gas cleaning were applied in China, and fine residue, an emerging hazardous waste containing high content of heavy metals as well as Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were produced. Disposal of the residues in secure landfill after adequate solidification/stabilization was the main solution. The feasibility of solidification/stabilization process using cement and chelating agent was investigated in this study. Leaching concentration of Lead (Pb) and Selenium (Se) exceeded the identification limit, and the content of PCDD/Fs was rather low, so the immobilization of Pb and Se was the main objective of solidification/stabilization. The result showed that leaching concentrations of Pb in the solidified products were lower than 5 mg/L when the addition of cement was 20 % or chelating agent 1 %. However, leaching concentration of Se fluctuated between 0.6 and 0.8 mg/L even the cement addition reached 45 % or chelating agent 3 %. Geochemical modelling using PHREEQC indicated that Se in the residue mainly existed as highly soluble SeO4 2−. © 2014 Springer Japan.

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