The Solidification of Lead-Zinc Smelting Slag through Bentonite Supported Alkali-Activated Slag Cementitious Material

Yanhong Mao, Faheem Muhammad, Lin Yu, Ming Xia, Xiao Huang, Binquan Jiao, YanChyuan Shiau and Dongwei Li
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Yanhong Mao: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
Faheem Muhammad: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
Lin Yu: College of Resource and Environmental Science, Chongqing University, Chongqing, 400044, China
Ming Xia: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
Xiao Huang: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
Binquan Jiao: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China
YanChyuan Shiau: Department of Landscape Architecture, Chung Hua University, No. 707, Wufu Rd., Sec. 2, Hsinchu 30012, Taiwan
Dongwei Li: State Key Laboratory for coal mine disaster dynamics and control, Chongqing University, Chongqing 400044, China

IJERPH, 2019, vol. 16, issue 7, 1-15

Abstract: The proper disposal of Lead-Zinc Smelting Slag (LZSS) having toxic metals is a great challenge for a sustainable environment. In the present study, this challenge was overcome by its solidification/stabilization through alkali-activated cementitious material i.e., Blast Furnace Slag (BFS). The different parameters (water glass modulus, liquid-solid ratio and curing temperature) regarding strength development were optimized through single factor and orthogonal experiments. The LZSS was solidified in samples that had the highest compressive strength (after factor optimization) synthesized with (AASB) and without (AAS) bentonite as an adsorbent material. The results indicated that the highest compressive strength (AAS = 92.89MPa and AASB = 94.57MPa) was observed in samples which were prepared by using a water glass modulus of 1.4, liquid-solid ratio of 0.26 and a curing temperature of 25 °C. The leaching concentrations of Pb and Zn in both methods (sulfuric and nitric acid, and TCLP) had not exceeded the toxicity limits up to 70% addition of LZSS due to a higher compressive strength (>60 MPa) of AAS and AASB samples. While, leaching concentrations in AASB samples were lower than AAS. Conclusively, it was found that the solidification effect depends upon the composition of binder material, type of leaching extractant, nature and concentration of heavy metals in waste. The XRD, FTIR and SEM analyses confirmed that the solidification mechanism was carried out by both physical encapsulation and chemical fixation (dissolved into a crystal structure). Additionally, bentonite as an auxiliary additive significantly improved the solidification/stabilization of LZSS in AASB by enhancing the chemical adsorption capacity of heavy metals.

Keywords: alkali activated slag; lead-zinc smelting slag; bentonite; solidification/stabilization (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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