Research progress on resource utilization of spent SCR denitrification catalyst
Recently,due to the increasing application of selective catalytic reduction(SCR)technology,a large number of spent SCR denitrification catalysts were inevitably produced.In order to save the re-sources and protect the environment,much attention should be attracted on their proper disposal.Spent SCR denitrification catalysts could be recycled as resources through the recovery of valuable compon-ents,overall utilization or solidification treatment,respectively.The valuable components could be ef-fectively recovered from spent denitrification catalysts by acid-base leaching,active roasting,molten salt electrolysis,chemical precipitation,organic extraction,ion exchange.The catalyst could also be wholly used as a raw material for regenerating the catalyst and producing titanium-containing pellets or titanium-containing sinter.Moreover,it can also be solidified by melt solidification,cement solidifica-tion,ceramic solidification.Overall,the above-mentioned methods were comprehensively summarized and prospected,which will provide inspiration and reference for the resource utilization of spent SCR denitrification catalysts in the future.