Title: Characterization of Heavy Metals and Dioxins in Fly Ash
Abstract: Fly ash is a hazardous material and of great concern due to the leaching behavior. Compositions of heavy metals, formation and control technology of dioxins, leaching toxicity, speciation distribution of heavy metals and mineral components, XRD analysis of mineral components, in fly ash, are fully provided. Effects of pH on leaching behavior of heavy metals and effects of temperature on volatilization ratios of heavy metals are presented. Results show that the contents of heavy metals in fly ash followed a sequence of Zn > Pb > Cu > Cr > As > Ni > Cd ≈ Hg. Most heavy metals in leaching solution, in accordance with horizontal vibration extraction procedure standard, exceed the limits. Major mineral components are found to be SiO2, Ca3Si2O7, Ca9Si6O21 ∙ H2O, AlCl3∙4Al(OH)3 ∙ 4H2O, etc. Al and Si have a direct relationship with extraction efficiency of heavy metals, which are conducive to stabilization of heavy metals. The simulation results using MINTEQA2 show that pH values may change the leaching behaviors of Zn, Cr, Cd, Ni, Pb, Cu, As, Hg. It is easy for Hg, Cd, As and Cd to volatilize, and a little difficult for Zn and difficult for Ni, Cr, and Cu to fly away from fly ash, with the increase of sintering temperature.
Publication Year: 2016
Publication Date: 2016-12-03
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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