Preparation of municipal solid waste incineration fly ash-based ceramsite and its mechanisms of heavy metal immobilization

粉煤灰 浸出(土壤学) 焚化 原材料 重金属 废物管理 城市固体废物 烧结 抗压强度 焚烧炉底灰 毒性特征浸出程序 金属 材料科学 环境科学 冶金 底灰 环境化学 化学 复合材料 土壤水分 有机化学 土壤科学 工程类
作者
Yingying Shao,Yanqiu Shao,Weiyi Zhang,Ying Zhu,Ting Dou,Leizhe Chu,Zhendong Liu
出处
期刊:Waste Management [Elsevier BV]
卷期号:143: 54-60 被引量:74
标识
DOI:10.1016/j.wasman.2022.02.021
摘要

With an increase in municipal solid waste incineration (MSWI) fly ash and its dangerous characteristics, the manner of its disposal has caused widespread concerns. In this study, ceramsite was prepared by using MSWI fly ash, civil sludge, and contaminated soil as the main raw materials; then, a certain proportion of clay was added as an additive. The optimum MSWI fly ash content and sintering conditions were investigated, and the immobilization mechanisms of heavy metals were explored. Based on the obtained results, the optimum preparation conditions were a preheating temperature of 400 °C, a preheating time of 10 min, a sintering temperature of 1150 °C, and a sintering time of 20 min. Moreover, the optimal raw material ratio of MSWI fly ash, civil sludge, contaminated soil, and flint clay was 30%:40%:15%:15%. Under these optimum preparation conditions, the obtained ceramsite showed the following excellent performance parameters: a 1-h water absorption of 0.97%, bulk density of 998.7 kg/m3, and cylindrical compressive strength of 37.84 MPa. Furthermore, the leaching of heavy metals was far less than the standard GB5085.3-2007. The immobilization of heavy metals in the ceramsite was mainly caused by the glass phase encapsulation and the formation of new crystal phase with the heavy metals. In addition, the generation of aluminosilicates played a positive role in the immobilization of heavy metals. Thus, the reuse of MSWI fly ash by preparing fly ash-based ceramsite is one of the effective methods for reducing solid wastes.
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