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http://dx.doi.org/10.7844/kirr.2012.21.6.65

Leaching of Vanadium and Tungsten from Spent SCR Catalysts for De-NOx by Soda Roasting and Water Leaching Method  

Kim, Hye-Rim (University of Science and Technology)
Lee, Jin-Young (Korea Institute of Geoscience and Mineral Resources)
Kim, Joon-Soo (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.21, no.6, 2012 , pp. 65-73 More about this Journal
Abstract
Selective catalytic reduction(SCR) catalysts are obtained from de-NOx system of thermoelectric power plant. A process was developed for valuable metals such as vanadium and tungsten recovery from spent SCR catalyst by using soda roasting followed by water leaching. Spent SCR catalyst having $V_2O_5$(1.23 mass %) and $WO_3$(7.73 mass %). For getting soluble metal forms of the targeted metals like vanadium and tungsten soda roasting process was implemented. In soda roasting process, sodium carbonate added 5 equivalent ratio at roasted temperature $850^{\circ}C$ with 120 min roasted time for $544{\mu}m$ particle size of spent SCR catalyst. After soda roasting process moved to water leaching for roasted spent catalyst. Before leaching process the roasted spent catalyst was grinded up to $-45{\mu}m$ size. The leaching time is 30 min at $40^{\circ}C$ temperature, 10 % pulp density. The final leaching efficiency obtained 46 % of vanadium and 92 % of tungsten from present process.
Keywords
spent SCR catalyst; soda roasting; water leaching; tungsten; vanadium;
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