基于铅锌冶炼渣碱激发材料固化铬渣的研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2631-2639.

基于铅锌冶炼渣碱激发材料固化铬渣的研究

方露^1,2, 黄萧^1,2

1.重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044;
2.重庆大学资源与安全学院,重庆 400044

收稿日期:2021-03-17 修回日期:2021-04-06 出版日期:2021-08-15 发布日期:2021-09-02
通讯作者: 黄萧,博士,助理研究员。E-mail:huangx@cqu.edu.cn
作者简介:方露(1996—),女,硕士研究生。主要从事固体废弃物处理与处置方面的研究。E-mail:164872747@qq.com
基金资助:
重庆市基础研究与前沿探索专项博士后科学基金项目(cstc2019jcyj-bshX0028)

Utilization of Alkali-Activated Lead-Zinc Smelting Slag for Chromite Ore Processing Residue Solidification

FANG Lu^1,2, HUANG Xiao^1,2

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
2. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China

Received:2021-03-17 Revised:2021-04-06 Online:2021-08-15 Published:2021-09-02

摘要/Abstract

摘要： 利用铅锌冶炼渣(LZSS)制备碱激发材料并固化铬渣(COPR)来实现废物共处理。通过单因素试验和正交试验探讨了碱含量、水玻璃模数、液固比和初始养护温度对碱激发LZSS强度的影响。基于上述试验,利用碱激发LZSS固化铬渣,并通过抗压强度和重金属浸出评价铬渣固化体的性能。结果表明:碱含量为2.5%(质量分数,下同),水玻璃模数为1.5,液固比为0.19,初始养护温度为35 ℃时,碱激发LZSS的最高抗压强度达到84.49 MPa;随着铬渣掺量的增加,铬渣固化体的抗压强度逐渐下降;铬渣掺量为40%(质量分数)时固化体强度降低至1.42 MPa;铬渣固化体(掺量0%~40%)中重金属Zn和Cr的浸出浓度远低于相应标准限值(美国EPA方法1311和中国GB 5085.3—2007),且环境扫描电镜(配备能谱仪)、X射线衍射和傅里叶红外光谱表征结果证明Zn和Cr可以通过化学和物理手段被有效固定。

关键词: 铅锌冶炼渣, 铬渣, 资源化利用, 碱激发材料, 废物共处理

Abstract: Lead-zinc smelting slag (LZSS) was used to prepare alkali-activated materials and solidify chromite ore processing residue (COPR) to realize waste co-treatment. Single-factor and orthogonal experiments were carried out which aim to explore the effects of various parameters (alkali content, water glass modulus, liquid-solid ratio, and initial curing temperature) for alkali-activated LZSS strength. Based on the above experiments, COPR was solidified by alkali-activated LZSS. Additionally, compressive strength and leaching toxicity were the indexes to evaluate the performance of the solidified bodies containing COPR. The results show that when the alkali content is 2.5% (mass fraction, the same below), the water glass modulus is 1.5, the liquid-to-solid ratio is 0.19, the initial curing temperature is 35 ℃, the compressive strength of alkali-activated LZSS reaches up to 84.49 MPa. With the increase of COPR content, the compressive strength of solidified bodies gradually decreases, and when 40% COPR is added, the compressive strength decreases to 1.42 MPa. However, the leaching concentrations of Zn and Cr from all the solidified bodies (the content of COPR is 0%~40%) are far below the critical limits (US EPA Method 1311 and China GB 5085.3—2007). Heavy metal ions in LZSS and COPR are immobilized successfully by chemical and physical means, which is manifested by the analyses of environmental scanning electron microscope with energy dispersive spectrometry, Fourier transform infrared spectrometry, and X-ray diffraction. The results show that alkali-activated LZSS can solidify COPR effectively.

Key words: lead-zinc smelting slag, chromite ore processing residue, resource utilization, alkali-activated material, waste co-treatment

中图分类号:

X758

方露, 黄萧. 基于铅锌冶炼渣碱激发材料固化铬渣的研究[J]. 硅酸盐通报, 2021, 40(8): 2631-2639.

FANG Lu, HUANG Xiao. Utilization of Alkali-Activated Lead-Zinc Smelting Slag for Chromite Ore Processing Residue Solidification[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2631-2639.

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