A new approach to collaborative resource utilization of biological sludge and zinc-bearing dust: Reduction characteristics and mechanisms

Qi, Liying; Wei, Rufei; Wang, Yanjun; Long, Hongming; Charles Xu, Chunbao

doi:10.1016/j.seppur.2024.130102

Separation and Purification Technology

2025

DOI: 10.1016/j.seppur.2024.130102

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A new approach to collaborative resource utilization of biological sludge and zinc-bearing dust: Reduction characteristics and mechanisms

Liying Qi,

Rufei Wei,

Yanjun Wang

et al.

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Utilization of Low-Rank Coal and Zn-Bearing Dusts for Preparation of K, Na-Embedded Porous Carbon Material and Metallized Pellets by Synergistic Activation and Reduction Process

Wang,

Zhu,

Yang

et al. 2024

Materials

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A technology was developed for managing Zn-bearing dust, facilitating the recycling of hazardous solid waste and the production of porous carbon materials. In the one-step process, Zn-bearing dusts were employed not only as raw materials to prepare reduced Zn-bearing dust pellets but also as activators to prepare K, Na-embedded activated carbon. In the process, the Fe, C, Zn, K, and Na in the dusts were rationally utilized. Under optimal conditions, the reduced pellets and porous carbon materials were simultaneously produced and characterized using XRD, SEM/EDS, FTIR, and adsorption of nitrogen techniques. The results indicated that the reduced pellets, with low levels of harmful elements and high iron grade and strength, could be directly used as burden for enhancing blast furnace operation without additional agglomeration. Meanwhile, the K and Na-embedded porous carbon material demonstrated superior SO2 and NO adsorption capacities compared to the commercial activated carbon, making it suitable for purifying SO2 and NO-bearing flue gas. The hazardous solid wastes were effectively used to treat flue gases through this technology. The mechanism in the synergistic reduction and activation process was elucidated. The coupling effect between the reduction reactions of Fe2O3, Fe3O4, FeO, MgFe2O4, CaFe2O4, ZnFe2O4, KFeO2, and NaFeO2 in the dusts and activation reaction of C in the coal promoted the synchronous reduction and activation process.

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Utilization of Low-Rank Coal and Zn-Bearing Dusts for Preparation of K, Na-Embedded Porous Carbon Material and Metallized Pellets by Synergistic Activation and Reduction Process

Wang,

Zhu,

Yang

et al. 2024

Materials

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show abstract

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A new approach to collaborative resource utilization of biological sludge and zinc-bearing dust: Reduction characteristics and mechanisms

Cited by 1 publication

References 33 publications

Utilization of Low-Rank Coal and Zn-Bearing Dusts for Preparation of K, Na-Embedded Porous Carbon Material and Metallized Pellets by Synergistic Activation and Reduction Process

Utilization of Low-Rank Coal and Zn-Bearing Dusts for Preparation of K, Na-Embedded Porous Carbon Material and Metallized Pellets by Synergistic Activation and Reduction Process

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