理论与试验研究

赤泥—石灰固化镉铅重金属污染土特性研究

  • 李丽华 ,
  • 唐宗振 ,
  • 裴尧尧 ,
  • 陈雪岭
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  • 1.湖北工业大学 土木建筑与环境学院,武汉 430068;
    2.湖北工业大学 河湖健康感知与生态修复教育部重点实验室,武汉 430068
李丽华(1980—),女,湖北孝感人,博士,教授,主要从事路基工程、加筋土、环境岩土方面教学与研究工作。E-mail:researchmailbox@163.com
裴尧尧(1984—),男,武汉人,博士,讲师,主要从事岩土工程相关的教学与科研工作。E-mail:yaoyao.bae@foxmail.com

收稿日期: 2024-10-25

  网络出版日期: 2025-09-03

基金资助

国家自然科学基金(52278347);湖北省重点研发计划项目(2022BCA059,2023BCB112);湖北工业大学杰出人才基金(XJ2021000501)

Study on the Characteristics of Red Mud-Lime Solidified Cadmium and Lead Heavy Metal Contaminated Soil

  • Li Lihua ,
  • Tang Zongzhen ,
  • Pei Yaoyao ,
  • Chen Xueling
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  • 1. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, P. R. China;
    2. Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei University of Technology, Wuhan 430068, P. R. China

Received date: 2024-10-25

  Online published: 2025-09-03

摘要

为实现固体废物赤泥的再利用,解决石灰高排放问题,提出利用赤泥和石灰固化/稳定化重金属镉、铅污染土体。对镉、铅固化污染土进行无侧限抗压强度、毒性浸出、扫描电镜及X射线衍射试验,探讨多种因素对固化土性能的综合影响,具体包括不同种类的固化剂、污染物浓度的变化以及养护时间,并分析微观结构变化及矿物组成。结果表明:赤泥—石灰的加入可以显著提升污染土抗压强度和降低镉和铅的浸出率,无污染条件下赤泥—石灰配比为4∶6且养护龄期为28 d时强度最高;固化土强度随污染物浓度呈先增后减的趋势,少量污染物的添加会使强度增强;加入石灰后更容易产生脆性破坏;镉、铅的浸出浓度随石灰占比的增加分别呈降低和先减后增的趋势;污染土pH值随固化剂中石灰占比的增加而增加;赤泥—石灰固化污染土的主要产物为C-S-H,其填充了土体孔隙,形成致密空间结构,随着石灰掺量的增加,生成物明显增多,高污染物浓度下反应被抑制,生成物减少。

本文引用格式

李丽华 , 唐宗振 , 裴尧尧 , 陈雪岭 . 赤泥—石灰固化镉铅重金属污染土特性研究[J]. 地下空间与工程学报, 2025 , 21(4) : 1219 -1227 . DOI: 10.20174/j.JUSE.2025.04.13

Abstract

In order to realize the reuse of solid waste red mud and solve the problem of high lime emission, it is proposed to use red mud and lime to solidify/stabilize heavy metals, cadmium, and lead-polluted soil. The unconfined compressive strength, toxic leaching, scanning electron microscopy, and X-ray diffraction tests were carried out on cadmium and lead cured contaminated soil to explore the effects of different types of stabilizers, pollutant concentrations, and curing ages on the compressive strength and heavy metal leaching concentration in stabilized soil. The changes of microstructure and mineral composition were analyzed. The results show that: The addition of red mud-lime could significantly improve the compressive strength of contaminated soil and reduce the leaching rate of cadmium and lead. Under non-polluted conditions, the red mud-lime ratio of 4∶6 with a curing period of 28d resulted in the highest strength. The strength of solidified soil increased first and then decreased with the concentration of pollutants, and the addition of a small amount of pollutants could increase the strength. Brittle failure was more likely to occur after adding lime. The leaching concentration of cadmium decreased while that for lead initially decreased, then increased with an increase in lime content. The pH value of contaminated soil increased with the increase of the proportion of lime in the curing agent. The main product of red mud-lime solidification contaminated soil was C-S-H, which filled the soil pores to form a dense spatial structure. With the increase of lime content, the products increased significantly. The reaction was inhibited at high pollutant concentration, leading to fewer products being formed.

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