垃圾焚烧飞灰固化体的力学和浸出特性分析

贺瑶瑶; 陈金洪

doi:10.13205/j.hjgc.201909028

垃圾焚烧飞灰固化体的力学和浸出特性分析

doi: 10.13205/j.hjgc.201909028

贺瑶瑶¹,
陈金洪^1,2

1. 武昌首义学院;
2. 武汉大学

基金项目:

湖北省自然科学基金项目(2017CFA072)

详细信息

作者简介:
贺瑶瑶,女,博士,工程师,主要从事环境岩土工程方面的研究工作。261384199@qq.com

中图分类号: X705
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- 文章访问数: 53
- HTML全文浏览量: 9
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2018-09-30
- 网络出版日期: 2023-11-24
- 刊出日期: 2019-09-30

摘要

摘要: 采用磷酸镁水泥(MPC)和普通硅酸盐水泥(OPC)对垃圾焚烧飞灰进行固化/稳定化处理,通过无侧限抗压强度试验、渗透试验和浸出试验分别研究了MPC和OPC对垃圾焚烧飞灰固化体力学和浸出特性的影响规律,并通过压汞试验和形态提取试验分析了相应的微观机理。试验结果表明:随着MPC和OPC添加量的增加,飞灰固化体的强度增加,渗透系数和重金属(Pb、Cd)浸出浓度降低,但相同添加量的OPC固化体的强度、渗透系数及重金属(Pb、Cd)浸出浓度均大于MPC固化体;压汞试验结果表明:在相同添加量条件下,OPC固化体的孔隙体积大于MPC固化体,且OPC和MPC分别通过减少孔径>1μm和>0. 1μm孔隙的体积来影响固化体的强度和渗透特性;形态提取试验结果表明:OPC和MPC均可促使Pb、Cd从活性态(弱酸提取态)向较稳定态(可还原态、残渣态)转化,但MPC固化体中残渣态的Pb、Cd含量较高。MPC固化体在力学特性、重金属浸出行为及微观结构均优于OPC固化体,OPC和MPC对Pb、Cd固稳机制的差异是MPC固稳效果优于OPC的根本原因。
- 固化/稳定化 /
- 垃圾焚烧飞灰 /
- 力学特性 /
- 浸出特性 /
- 形态分布

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参考文献(27)

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