Leaching Behavior of Harmful Components from Cement Solidities of Fluidized-Bed Coal Ash

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  • 流動床フライアッシュのセメント固化体からの有害成分の溶出挙動
  • リュウドウショウ フライ アッシュ ノ セメント コカタイ カラノ ユウガイ セイブン ノ ヨウシュツ キョドウ

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Abstract

Solidities of fluidized-bed fly ash with slag cement were prepared by hydrothermal treatment after adding gypsum, Na3PO4, or Al2(SO4)3. XRD analysis of the solidities was performed and leaching behavior of Pb and F from the solidities was investigated. The fly ash-cement and fly ash-cement-gypsum solidities showed rather high leaching concentration of F and Pb. The F leaching was explained by solubility products of a Ca(OH)2–CaF2 system. The Pb leaching concentrations roughly agreed with the theoretical curve for hydroxo complexes of Pb, showing a strong dependence on pH. Addition of Na3PO4 and Al2(SO4)3 to cement solidities gave katoite and aluminum phosphate, and ettringite, respectively, and these solidities showed lower leaching concentrations of F and Pb than the fly ash-cement and fly ash-cement-gypsum solidities. Capture of F and Pb in crystalline components such as ettringite probably accounts for such leaching suppression.

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