Many birds with one stone: Significant environmental premium from utilizing magnesium slag to manufacture high value-added polypropylene logistics pallets

• 1、School of materials Science & Chemical Engineering,Xi'an Technological University,Xi'an,Shaanxi 710021

Abstract：Polypropylene (PP) composites with different contents of magnesium slag were prepared by melt blending method. The input-output model based on life cycle assessment (LCA) was developed to calculate their energy consumption and pollutant emission for logistics pallets from cradle to gate stage. Six environmental impact types, including global warming potential (GWP), acid rain potential (AP), eutrophication potential (EP), photochemical ozone generation potential (POCP), aerosol potential (SP) and eco-toxic potential (ETP), were selected to investigate the effects of magnesium slag content on energy consumption and environmental impact load (EIL) of the resultant PP composites used as logistics pallets. The results show that the proportion of GWP is the largest, while the proportion of SP is the smaller for manufacturing these magnesium slag/PP logistics pallets. Compared with that of pure PP, one ton of the PP logistics pallets with 40% of magnesium slag content (Sample 5) reduces 24.5% of energy consumption and 25.3% of EIL during its half life cycle, respectively. It confirms that magnesium slag was used to modify PP to prepare logistics pallets has significant energy saving effect and environmental protection premium, which contribute to the early realization of China\'s "double carbon" strategy.

Keywords： Magnesium slag Polypropylene Life cycle assessment Environmental impact load