高钙粉煤灰地聚合物固化/稳定重金属离子研究
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国家自然科学基金资助项目(51172164,51208370);高等学校博士学科点专项科研基金资助项目(20090072110010,20110072120046)


Research on Solidification/Stabilization of Heavy Metal Ions by Class C Fly Ash Geopolymer
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    摘要:

    利用高钙粉煤灰研制地聚合物来固化/稳定重金属离子,研究了高钙粉煤灰地聚合物对重金属离子的固化/稳定效果,并进一步初探了高钙粉煤灰地聚合物对重金属离子的固化/稳定作用机制.研究表明:高钙粉煤灰地聚合物分别固化/稳定质量分数为0.025%的Pb(Ⅱ),0.025%的Cr(Ⅵ)和0.010%的Hg(Ⅱ)后,重金属离子的浸出浓度远低于规定的上限值,固化率均在98%(质量分数)以上;高钙粉煤灰地聚合物固化/稳定重金属离子后,有无定形的地聚合物凝胶及类沸石矿物CaAl2Si2O8·4H2O生成,重金属阳离子部分置换了Na+或Ca2+,被键合在地聚合物的网状结构中,引起了分子基团的显著变化;在无定形凝胶之间分别出现了细丝状、膨化状以及粒状产物.

    Abstract:

    Class C fly ash was used to prepare the geopolymer for solidification and stabilization of the heavy metal ions. The effect of the solidification and stabilization of heavy metal ions by class C fly ash geopolymer was investigated and its mechanism was discussed. The results show that after solidification and stabilization of 0.025%(by mass) of Pb(Ⅱ),0.025%(by mass)of Cr(Ⅵ) and 0.010%(by mass) of Hg(Ⅱ) by class C fly ash geopolymer,the leaching concentrations of heavy metal ions are far lower than the upper limit, and all the solidified/stabilized ratios of heavy metal ions reach 98%. Amorphous geopolymeric gel and similar zeolite mineral of CaAl2Si2O8 ·4H2O are formed when the geopolymer solidified/stabilized the heavy metal ions. Cations of heavy metal partly replace Na+ or Ca2+ and are bond in the geopolymeric network with the result that the molecule radical is significantly changed. When the geopolymer solidified/stabilized Cr(Ⅵ), Pb(Ⅱ), and Hg(Ⅱ) the filamentous product, swelling product, and granule product are observed among the amorphous gel.

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郭晓潞,施惠生.高钙粉煤灰地聚合物固化/稳定重金属离子研究[J].建筑材料学报,2012,(6):751-754

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  • 收稿日期:2011-06-13
  • 最后修改日期:2011-08-04
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  • 在线发布日期: 2012-12-27
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