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建筑石膏与胶凝材料
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碱激发粉煤灰固化/稳定化铬污染土壤的研究

作者：田平1，武双磊2，刘浩2，刘磊1，陈胡星2

关键字：碱,激发,粉煤灰,固化,稳定,化铬,污染,土壤,的,

　
（1.浙江卓锦环保科技股份有限公司，浙江 杭州  310004；
2.浙江大学 材料科学与工程学院，浙江 杭州  310027）
    摘要：通过无侧限抗压强度和铬浸出毒性试验，研究了碱激发粉煤灰胶凝材料与FeCl2对铬污染土壤（CCS）的固化/稳定化效果。结果表明：随碱激发粉煤灰掺量增加，CCS固化体强度提高，Cr6+和总Cr浸出浓度则下降，但仍保留较高的浓度；FeCl2显著降低CCS的Cr6+和总Cr浸出浓度。碱激发粉煤灰胶凝材料和FeCl2复合固化/稳定化CCS，可使CCS同时具有较高的强度和较低铬浸出浓度，28 d无侧限抗压强度近10 MPa，Cr6+和总Cr浸出浓度低至0.5、1.0 mg/L以下，是一种潜在的资源化利用CCS的方法。
    关键词：碱激发粉煤灰；铬污染土壤；铬浸出浓度；强度
    中图分类号：TU44        文献标识码：A        文章编号：1001-702X（2021）02-0110-04
 
Stabilization/solidification of chromium-contaminated soil with alkali-activated fly ash binder
TIAN Ping1，WU Shuanglei2，LIU Hao2，LIU Lei1，CHEN Huxing2
（1.Zhejiang Zone-King Environmental Science & Technology Co. Ltd.，Hangzhou 310004，China；2.School of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China） 
    Abstract：Effect of alkali-activated fly ash binder and FeCl2 on the solidification/stabilization of chromium contaminated soil（CCS） was explored through unconfined compressive strength and chromium leaching toxicity tests. The results show that the amount of alkali fly ash increases，the strength of the CCS solidified body increases，and the leaching concentrations of Cr6+ and total Cr decrease，but remains higher concentration. FeCl2 significantly reduced the Cr6+ and total Cr leaching concentrations of CCS. Solidification/stabilization with mixture of alkali-activated fly ash binder and FeCl2 is a potential resource utilization method of CCS，which make CCS have better strength and lower Cr leaching concentration，such as 28 d strength close to 10 MPa，the Cr6+ and total Cr leaching concentration less than 0.5 mg/L and 1.0 mg/L respectively.
    Key words：alkali-activated fly ash，chromium contaminated soil，chromium leaching concentration，strength