Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (4): 73-78.

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Retention Efect of Ground Blast-Furnace Slag on the Leaching of Cr(VI)from Hardened Fly Ashes

Cheng Li1  Yu Qi-jun2  Lin Jin-met3  Shigeyoshi Nagataki4   

  1. 1.Key Laboratory of Specially Functional Materials and Advanced Manufacturing Tech.,the Ministry of Education,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.College of Materials Science and Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;3.Department of Civil Engineering and Architecture,Faculty of Engineering,Niigata University,Niigata 950-2181,Japan
    4.Research Institute for Industrial Technology,Aichi Institute of Technology ,Aichi-ken 470-0392,Japan
  • Received:2004-07-13 Online:2005-04-25 Published:2005-04-25
  • Contact: 成立(1968-)，女，现任荆门职业技术学院化工系讲师，华南理工大学访问学者，主要从事无机非金属材料科学与工程研究． E-mail:cclwb.9516@tom.com
  • About author:成立(1968-)，女，现任荆门职业技术学院化工系讲师，华南理工大学访问学者，主要从事无机非金属材料科学与工程研究．
  • Supported by:

    国家自然科学基金资助项目(50372021)

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Abstract:

The retention effcts of two kinds of ground blast-furnace slag(GBFS)on the leaching of Cr(VI)from hardened fly ash slurry and the hardened fly ash compacted at the optimum moisture content were investigated in this paper.The results show that:(1)the leaching of Cr(VI)from hardened fly ashes can be effectively restrained by GBFS with proper treatment;(2)the retention efect of GBFS on the leaching of Cr(VI)depends on the types of fly ashes,the preparation method of specimens and the fineness and content of GBFS;(3)better retention effect is achieved when GBFS and OPC(Ordinary Portland Cement)are used together;and(4)generally speaking,the leaching of Cr(VI)from hardened fly ashes decreases with the prolonging of curing time.It is also indicated that the formation of ettringite and C- S- H gel in hardened fly ashes contributes significantly to the fixation and stabili.zation of Cr(VI).

Key words: hardened fly ash, hexavalent chromium ion, ground blast·furnace slag, leaching, retention