Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
This paper evaluates the environmental impact of the recycling production process of hydrogen desulfurization waste metal catalyst, based on the life cycle assessment(LCA), divides the whole recycling production process into six stages, selects 12 key environmental impact types, establishes material input and emission list, and conducts the model building and calculation based on eBalance software. The results showed that the total environmental impact of recovering 1 ton of spent catalyst is 1.11E-08, and the potential value of the GWP(potential value of the global warming effect) is the largest environmental impact contribution type in the process of recovering spent catalyst. The environmental impact contribution of the roasting stage is the largest, followed by the cobalt nickel extraction stage, concentration evaporation stage and then molybdenum vanadium extraction stage, while the environmental impact contribution of the pretreatment stage and transportation stage is very small. The energy alternative is proposed based on the life cycle evaluation analysis, and the environmental impact of the clean energy alternatives is 4.98E-09, reduced by 55.16% from the environmental impact of recycling process.
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