A green process for the conversion of hazardous sintering dust into K2SO4 and NH4Cl fertilizers

Wang, Qiren; Ma, Xin; Wang, Shuai; Cao, Zhanfang; Hua, Zongwei; Zhong, Hong

doi:10.1016/j.jenvman.2022.116676

Cited by 1 publication

(2 citation statements)

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“…It is usually disposed of as waste, causing environmental pollution and loss of valuable resources. , The reuse of sintering dust is an important practice for the steel industry to reduce waste, conserve resources, and protect the environment . The utilization of sintering dust has attracted a lot of attention from researchers. , …”

Section: Introductionmentioning

confidence: 99%

“…5 The utilization of sintering dust has attracted a lot of attention from researchers. 6,7 The hydrothermal method and the impregnation method are both commonly used techniques for synthesizing materials, particularly inorganic materials. The hydrothermal method utilizes high-pressure, high-temperature water to promote chemical reactions and produce the desired material.…”

Section: Introductionmentioning

confidence: 99%

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Performance of an SCR Catalyst from Sintering Dust by the Hydrothermal Method and Its Water/Sulfur Resistance

Zhou

et al. 2023

Energy Fuels

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Durability is an issue for selective catalytic reduction (SCR) catalysts due to their susceptibility to sulfur and water poisoning. In this study, Nano-Ce 10 -PSDC HF /ZrO 2 was prepared by the hydrothermal method using sintering dust, and the impact of SO 2 or water vapor on its SCR performance was investigated. The denitrification performance of Nano-Ce 10 -PSDC HF /ZrO 2 was better than that of 0.25-Ce 10 -PSDC HF /ZrO 2 prepared by the impregnation method in the entire temperature interval from 80 to 400 °C. The highest denitrification rate of 93.6% was achieved at 280 °C. Nano-Ce 10 -PSDC HF /ZrO 2 had a smaller particle size and uniform dispersion but also formed a high concentration of Ce 3+ and adsorbed oxygen O α on the surface. Additionally, it showed better resistance to water and sulfur than 0.25-Ce 10 -PSDC HF /ZrO 2 . Even when exposed to 8% H 2 O and 400 ppm SO 2 , the denitrification rate of Nano-Ce 10 -PSDC HF /ZrO 2 remained at 82.1% after 4 h. SO 2 is more toxic to SCR catalysts than H 2 O. The effect of water on catalyst activity is partially reversible. Deactivation of SCR by SO 2 is primarily caused by the formation of ammonium sulfate species, with some contribution from competitive adsorption between SO 2 and NO x . In conclusion, the Nano-Ce 10 -PSDC HF /ZrO 2 catalyst exhibited the best SCR performance, with water and sulfur resistance, and effectively utilized sintering dust, which has potential application value.

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