烧结烟气脱硝废弃钒钨钛催化剂资源化利用途径分析

doi:10.13228/j.boyuan.issn0449-749x.20220007

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Abstract In 2019, the "Proposal on promoting the implementation of ultra-low emissions in the steel industry" was presented by Chinese government, aiming to convert more than 80% of China's iron and steel capacity enterprises into ultra-low emission transformation by the end of 2025. Currently, NO_x emission reduction from sinter flue gas has become the focus. Selective catalytic reduction with ammonia (NH₃-SCR) based on vanadium-tungsten-titanium catalyst has become one of the mainstream technologies for sinter flue gas denitrification and has been widely used in iron and steel enterprises. However, as the catalysts reach the end of their life, spent catalysts are increasing year by year. It is estimated that the spent catalysts produced by sinter flue gas denitrification will reach 100 000 m³ per year in 2027 in China. Vanadium-tungsten-titanium spent catalysts contain V₂O₅, which have strong biological toxicity and have been classified as "HW50" hazardous waste in the new National Hazardous Waste List. With the increasingly stringent environmental requirements, the effective disposal of spent catalysts has become a key common problem that needs to be solved in iron and steel industry. The current status of spent catalyst disposal was summarized in terms of disposal concepts and technical methods. The main treatment methods include valuable element extraction, spent catalyst recycling and harmless disposal. The corresponding technical approaches of valuable element extraction include leaching, extraction, precipitation, hydrothermal synthesis and carbon thermal reduction. Spent catalyst recycling includes the mixing of spent catalysts to make new catalysts. Harmless disposal includes solidification/stabilization before landfill disposal. Based on the new development concept of "solid waste does not leave the factory" in iron and steel enterprises, the research ideas related to the resource utilization of spent catalysts as a titanium resource in the steel production process are analyzed. Finally, the prospect of efficient and clean utilization of spent catalysts in iron and steel enterprises is presented.

Key words： flue gas denitrification spent V₂O₅-WO₃/TiO₂ catalyst valuable elements recycling blast furnace protection

Received: 05 January 2022

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	LONG Hong-ming
	DING Long
	TAO Jia-jie
	QIAN Li-xin

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LONG Hong-ming,DING Long,TAO Jia-jie等. Analysis on resource utilization of spent V₂O₅-WO₃/TiO₂ catalyst produced in sintering flue gas[J]. Iron and Steel, 2022, 57(7): 162-178.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220007 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I7/162

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