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文章摘要

多固废协同固化Cr污染土壤的效果对比研究

Comparison of the Effects of Multi Solid Waste Synergistic Solidification on Cr contaminated Soil

DOI：

英文关键词: Cr contaminated soil Multi solid waste synergistic curing agent Solidification rate Leaching toxicity

基金项目:国家重点研发计划基金资助项目（2019YFC1806004）；内蒙古自治区科技成果转化基金资助项目（CGZH2018153）

作者	单位
楚振哲	内蒙古科技大学材料科学与工程学院；内蒙古自治区先进陶瓷材料与器件重点实验室；内蒙古科技大学轻稀土资源绿色提取与高效利用教育部重点实验室
刘芳	内蒙古科技大学材料科学与工程学院；内蒙古自治区先进陶瓷材料与器件重点实验室；内蒙古科技大学轻稀土资源绿色提取与高效利用教育部重点实验室
郭佳林	内蒙古科技大学稀土产业学院
杨旭	内蒙古科技大学稀土产业学院

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中文摘要:

以Cr污染场地土壤为研究对象，将土壤含水率、固化剂掺量、养护龄期作为变量，对比经水泥基固化剂（PC）和多固废协同固化剂（CBC）固化后的Cr污染土壤的无侧限抗压强度、浸出毒性、渗透性，并采用扫描电子显微镜（SEM）和X射线衍射（XRD）分析PC和CBC的固化效果，揭示固化剂的固化机理。结果表明：在相同试验条件下，CBC固化土的无侧限抗压强度均高于PC固化土；CBC对总Cr固化率最高可达886%，对Cr6+的固化率可超过991%，优于PC固化土；CBC掺量为20%、土壤含水率为40%的固化土经过28 d养护后的渗透系数仅为48×10-8cm/s，低于同条件下PC固化土，CBC固化后的土壤强度更高。

英文摘要:

Taking the soil from a Cr contaminated site as the research object， the unconfined compressive strength， leaching toxicity and permeability of Cr contaminated soil solidified by cement based curing agent (PC) and multi solid waste synergistic curing agent (CBC) were compared with soil moisture content， solidifier dosage and curing age as variables. Scanning electron microscopy (SEM) and X ray Diffraction (XRD) were used to analyze the curing effects of PC and CBC， revealing the curing mechanism of the solidifying agent. The results showed that under the same experimental conditions， the unconfined compressive strength of CBC solidified soil was higher than that of 〖GK!87mm〗PC solidified soil. 〖JP2〗CBC achieved a maximum solidification rate of 886% for total Cr， and over 991% for Cr6+， outperforming PC solidified soil. The permeability coefficient of the solidified soil with 20% CBC and 40% moisture content after 28 days of curing was only 4.8×10-8 cm/s， lower than that of PC solidified soil under the same conditions. The soil strength was high after CBC solidification.

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