电解锰渣是电解金属锰过程产生的固体废弃物,目前主要以堆存方式进行处置,因为其含有重金属、溶解锰和氨氮等有害成分,对土壤、水体和生态环境存在造成严重污染的潜在风险,是当前亟需解决的重要问题;因此,推动电解锰渣的资源化利用,实...电解锰渣是电解金属锰过程产生的固体废弃物,目前主要以堆存方式进行处置,因为其含有重金属、溶解锰和氨氮等有害成分,对土壤、水体和生态环境存在造成严重污染的潜在风险,是当前亟需解决的重要问题;因此,推动电解锰渣的资源化利用,实现其向资源的有效转化,已成为电解锰行业缓解资源环境压力、推动绿色低碳转型的重要方向。采用生命周期评价方法,研究电解锰渣应用于水泥和蒸压砖替代原料的资源和环境综合效益,通过与传统堆存处置、水泥及蒸压砖常规生产工艺的环境影响进行对比,探讨了电解锰渣不同资源化利用路径在节约资源、降低全球变暖潜力、减少环境影响等方面的影响。结果显示,与传统生产工艺相比,每吨电解锰渣的资源化利用可以降低约0.66~1.96 kg Cu当量的矿产资源耗竭影响和43.00~136.77 kg油当量的化石能源耗竭影响;在温室气体减排方面,利用每吨电解锰渣生产32.5强度等级硅酸盐水泥、42.5强度等级硅酸盐水泥以及蒸压砖产品,可分别降低816.75、926.71、300.89 kg CO_(2)当量的全球变暖潜力;在环境影响指标值方面,利用电解锰渣生产42.5强度等级硅酸盐水泥情景下的综合表现优于其他情景,颗粒物生成指标降低1.25 kg细颗粒物(PM_(2.5))当量,陆地酸化指标降低4.12 kg SO_(2)当量,陆地生态系统毒性指标降低361.86 kg 1,4-二氯苯当量。展开更多
A Fe modified Na2WO4 compound was synthesized by a solution impregnation method and was ball-milled with MgH2 to constitute a novel MgH2-Fe2O3/Na2WO4 composite. The effects of the Fe2O3/Na2WO4 additive on the hydrogen...A Fe modified Na2WO4 compound was synthesized by a solution impregnation method and was ball-milled with MgH2 to constitute a novel MgH2-Fe2O3/Na2WO4 composite. The effects of the Fe2O3/Na2WO4 additive on the hydrogen storage properties of MgH2 together with the corresponding mechanism were investigated. At 423 K, within the first 200 seconds, the hydrogen absorption amount of MgH2+20 wt% Fe2O3/Na2WO4 was almost 5 times that of pure MgH2. And at 573 K, its total hydrogen desorption amount was 7 times that for pure MgH2. Meanwhile, its onset dehydrogenation temperature was 110 K lower than that of pure MgH2. It was worth noting that the MgH2+20 wt% Fe/Na2WO4 presented the lower dehydrogenation reaction activation energy(Ea) of 35.9 kJ·mol^-1 compared to that of pure MgH2. The active MgWO4, Mg2 FeH6 and MgO formed during the milling process were responsible for the improvement of the hydrogen storage properties for MgH2.展开更多
文摘电解锰渣是电解金属锰过程产生的固体废弃物,目前主要以堆存方式进行处置,因为其含有重金属、溶解锰和氨氮等有害成分,对土壤、水体和生态环境存在造成严重污染的潜在风险,是当前亟需解决的重要问题;因此,推动电解锰渣的资源化利用,实现其向资源的有效转化,已成为电解锰行业缓解资源环境压力、推动绿色低碳转型的重要方向。采用生命周期评价方法,研究电解锰渣应用于水泥和蒸压砖替代原料的资源和环境综合效益,通过与传统堆存处置、水泥及蒸压砖常规生产工艺的环境影响进行对比,探讨了电解锰渣不同资源化利用路径在节约资源、降低全球变暖潜力、减少环境影响等方面的影响。结果显示,与传统生产工艺相比,每吨电解锰渣的资源化利用可以降低约0.66~1.96 kg Cu当量的矿产资源耗竭影响和43.00~136.77 kg油当量的化石能源耗竭影响;在温室气体减排方面,利用每吨电解锰渣生产32.5强度等级硅酸盐水泥、42.5强度等级硅酸盐水泥以及蒸压砖产品,可分别降低816.75、926.71、300.89 kg CO_(2)当量的全球变暖潜力;在环境影响指标值方面,利用电解锰渣生产42.5强度等级硅酸盐水泥情景下的综合表现优于其他情景,颗粒物生成指标降低1.25 kg细颗粒物(PM_(2.5))当量,陆地酸化指标降低4.12 kg SO_(2)当量,陆地生态系统毒性指标降低361.86 kg 1,4-二氯苯当量。
基金Funded by the National Natural Science Foundation of China(No.51771164)Scientific Research Projects in Colleges and Universities in Hebei Province,China(No.ZD2019307)+2 种基金the Fundamental Research Funds for the Central Universities(No.3142019013)the Natural Science Foundation of Hebei Province of China(No.E2019508214)the Program for Top-notch Young Talents in University of Hebei Province(No.BJ2016043)
文摘A Fe modified Na2WO4 compound was synthesized by a solution impregnation method and was ball-milled with MgH2 to constitute a novel MgH2-Fe2O3/Na2WO4 composite. The effects of the Fe2O3/Na2WO4 additive on the hydrogen storage properties of MgH2 together with the corresponding mechanism were investigated. At 423 K, within the first 200 seconds, the hydrogen absorption amount of MgH2+20 wt% Fe2O3/Na2WO4 was almost 5 times that of pure MgH2. And at 573 K, its total hydrogen desorption amount was 7 times that for pure MgH2. Meanwhile, its onset dehydrogenation temperature was 110 K lower than that of pure MgH2. It was worth noting that the MgH2+20 wt% Fe/Na2WO4 presented the lower dehydrogenation reaction activation energy(Ea) of 35.9 kJ·mol^-1 compared to that of pure MgH2. The active MgWO4, Mg2 FeH6 and MgO formed during the milling process were responsible for the improvement of the hydrogen storage properties for MgH2.
