Cotreatment of MSWI Fly Ash and Granulated Lead Smelting Slag Using a Geopolymer System

• Published in: International journal of environmental research and public health Vol. 16; no. 1; p. 156
• Main Authors: Liu, De-Gang, Ke, Yong, Min, Xiao-Bo, Liang, Yan-Jie, Wang, Zhong-Bing, Li, Yuan-Cheng, Fei, Jiang-Chi, Yao, Li-Wei, Xu, Hui, Jiang, Guang-Hua
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 08-01-2019; MDPI
• Subjects: Arsenic; Arsenic - chemistry; Ball milling; Cement; Civil engineering; Coal; Coal Ash - chemistry; Compressive strength; Construction materials; Fly ash; Fourier transforms; Granulation; Heavy metals; Hydration; Incineration; Industrial Waste; Industrial wastes; Ion exchange; Leachates; Leaching; Lead; Lead - chemistry; Metallurgy; Metals; Metals, Heavy - chemistry; Municipal solid waste; Municipal waste management; Physical properties; Polymers - chemistry; Reagents; Refuse Disposal - methods; Salt; Slag; Smelting; Solid waste management; Solid wastes; Solidification; Solids; Toxic wastes; Toxicity; Waste disposal; Water Pollutants, Chemical - chemistry; X-ray diffraction; China; geopolymer; MSWI fly ash; solidification/stabilization; granulated lead smelting slag; heavy metals; Friedel’s salt
• ISSN: 1660-4601; 1661-7827; 1660-4601
• DOI: 10.3390/ijerph16010156

Municipal solid waste incineration fly ash (MSWI FA) and granulated lead smelting slag (GLSS) are toxic industrial wastes. In the present study, granulated lead smelting slag (GLSS) was pretreated as a geopolymer precursor through the high-energy ball milling activation process, which could be used as a geopolymeric solidification/stabilization (S/S) reagent for MSWI FA. The S/S process has been estimated through the physical properties and heavy metals leachability of the S/S matrices. The results show that the compressive strength of the geopolymer matrix reaches 15.32 MPa after curing for 28 days under the best parameters, and the physical properties meet the requirement of MU10 grade fly ash brick. In addition, the toxicity characteristic leaching procedure (TCLP) test results show that arsenic and heavy metals are immobilized effectively in the geopolymer matrix, and their concentrations in the leachate are far below the US EPA TCLP limits. The hydration products of the geopolymer binder are characterized by X-ray diffraction and Fourier transform infrared methods. The results show that the geopolymer gel and Friedel's salt are the main hydration products. The S/S mechanism of the arsenic and heavy metals in the geopolymer matrix mainly involves physical encapsulation of the geopolymer gel, geopolymer adsorption and ion exchange of Friedel's salt.