Process Optimization for Denitration Catalyst Preparation from Rare Earth Tailings by Synergistic Activation of High-Energy Ball Milling and Microwave Roasting AITranslate

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Chinese Library Classification Number:TD926.4[矿业工程—选矿];TQ426[化学工程]

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To realize the resource utilization of rare earth tailings and develop high-efficiency NH₃-SCR de-nitration catalysts,Bayan Obo rare earth tailings were used as raw material to prepare catalysts in this study.By combining orthogonal experiments and multi-objective decision-making,the regulation laws of synergistic activation process parameters of high-energy ball milling and microwave roasting on the deni-tration performance and microstructure of the prepared catalysts were systematically investigated.The op-timal parameter combinations and the sensitivity of each parameter under different weight objectives of de-nitration efficiency and N2 selectivity were determined.The results show that the synergistic activation process of high-energy ball milling and microwave roasting can effectively activate the active components in rare earth tailings and significantly improve their catalytic performance.Under appropriate process condi-tions,the rare earth tailings catalyst exhibits a greatly enhanced denitration efficiency within the tempera-ture window of 200~400℃,together with excellent N2 selectivity.As determined by comprehensive per-formance index optimization,the optimal combination of process parameters is identical under different weight ratios of denitration efficiency and N2 selectivity:ball milling time 2 h,ball milling speed 300 r/min,ball-to-powder mass ratio 1∶1,diameter ratio of large,medium and small grinding balls 1∶1∶1,micro-wave roasting temperature 350℃,microwave roasting time 20 min,and microwave power 1100 W.The ball-to-powder mass ratio is the most sensitive factor among all the investigated schemes,and the sensitivi-ty of high-energy ball milling parameters is generally significantly higher than that of microwave roasting parameters,confirming that high-energy ball milling plays a dominant role in promoting mineral dissocia-tion and exposing active sites.Therefore,high-energy ball milling parameters,especially the ball-to-powder mass ratio,should be preferentially regulated in practical process optimization.This study provides syste-matic process guidance and theoretical support for the low-cost preparation of catalysts based on rare earth tailings and the regulation of their denitration performance.