Leaching behavior and stabilization/solidification characterization of heavy metals from silicomanganese slag

被引：5

作者：

Yu, Wenjing ^{[1
]}

Bu, Yongguang ^{[2
]}

Yao, Jun ^{[1
]}

Zhang, Siqi ^{[3
]}

Zhao, Yuhui ^{[1
]}

Huang, Xiaoyan ^{[4
]}

Ni, Wen ^{[3
]}

机构：

[1] China Univ Geosci Beijing, Res Ctr Environm Sci & Engn, Sch Water Resources & Environm, Beijing 100083, Peoples R China

[2] Univ Sci & Technol China, Dept Environm Sci & Engn, CAS Key Lab Urban Pollutant Convers, Hefei 230026, Peoples R China

[3] Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China

[4] Beike Yunhong Environm Protect Technol Beijing Co, Beijing 100049, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2025年 / 485卷

基金：

美国国家科学基金会;

关键词：

Silicomanganese slag; Heavy metal; Leaching behavior; Cementitious material; Solidification/stabilization mechanism; SEQUENTIAL EXTRACTION PROCEDURE; S-H GELS; ALKALI ACTIVATION; TRACE-ELEMENTS; FLY-ASH; RED MUD; CEMENT; MICROSTRUCTURE; HYDRATION; PRODUCTS;

D O I：

10.1016/j.jhazmat.2024.136915

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The utilization of silicomanganese slag (SMS) for the partial substitution of cement holds significant importance in handling environmental risks and achieving the harmless and resourceful utilization of industrial solid wastes. Nevertheless, an in-depth analysis of the leaching behaviors of heavy metals and the solidification/stabilization mechanisms in SMS and cementitious materials is still lacking. In this study, we adopted the toxicity characteristic leaching procedure and horizontal vibration method to simulate the natural leaching environment, thereby exploring the leaching risks related to heavy metals in the aforementioned materials. The results indicated that the release and migration of heavy metals were highly reliant on environmental pH values. Among them, Mn predominantly existed in SMS in the form of acid extractable fraction, and its dissolution was mainly governed by rhodochrosite and hausmannite. Fortunately, cementitious materials fabricated from SMS can conspicuously prevent the leaching of heavy metals such as Mn, Cr, Ni and As. The mechanism analysis disclosed that heavy metals can be effectively immobilized by silicon-aluminum structures through physical encapsulation,

引用

页数：9