碳热还原/熔融分离废SCR催化剂中有价金属

doi:10.11962/1006-4990.2019-0087

Abstract

Abstract:

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

CLC Number:

TQ426

Li Pufang,Mu Lin,Wang Shebin. Carbon thermal reduction/melting separation of valuable metals from spent SCR catalysts[J]. Inorganic Chemicals Industry, 2020, 52(1): 93-98.

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Carbon thermal reduction/melting separation of valuable metals from spent SCR catalysts

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