Inorganic Chemicals Industry >
Carbon thermal reduction/melting separation of valuable metals from spent SCR catalysts
Received date: 2019-08-08
Online published: 2020-02-26
On the basis of thermodynamics calculate,the spent SCR catalyst（V-Ti） was mixed with C,Fe and CaO and then melted and reduced in a DC arc furnace.The chemical composition and phase of slag/iron samples were analyzed by SEM and XRD.The basic problem of spent SCR catalyst recycling was studied,and the behavior and mechanism of carbon thermal reduction/melting separation were discussed.Results showed that the recovery rate of the valuable metal changed with the amount-of-substance ratio of C to O,temperature and basicity etc..Under the condition of molten pool temperature of 1 650 ℃,the optimal parameters of recycling TiO 2/metal from spent SCR catalyst were as follows：n（C）/n（O）=1.0 and basicity was 1.0. This can realize the complete separation of ferroalloy containing V and W and high titanium slag.The recovery of Fe,V,W and TiO2 could reach around 99%,97%,92% and 93.5%,respectively.This is of great practical significance and economic value for the development of spent SCR catalyst recycling technology and the realization of sustainable development.
Key words： spent SCR catalyst; carbothermal reduction; slag/iron separation
Pufang Li , Lin Mu , Shebin Wang . Carbon thermal reduction/melting separation of valuable metals from spent SCR catalysts[J]. Inorganic Chemicals Industry, 2020 , 52(1) : 93 -98 . DOI: 10.11962/1006-4990.2019-0087
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