转炉钒渣中锰的含量为6.82%,是一种低品位锰资源。实验研究了转炉钒渣中锰的浸出行为,分析了相关实验参数对锰浸出行为的影响。研究发现,在反应条件为硫酸浓度10%,反应温度90℃,反应时间120 min,反应液固比4:1 m L/g时,锰的浸出率可达到76.02%。引入电场不会影响锰的浸出行为,但硫酸亚铁的加入则会降低了锰的浸出率。反应过程中会生成大量的CaSO_4,会像膜一样包裹在转炉钒渣表面,阻碍反应的进行。
Three dimensionally ordered macroporous(3 DOM) Ce-based catalysts were successfully prepared via a surfactant-assisted colloidal crystal template(CCT) route. The as-synthesized catalysts showed wellordered structures with macropores and small interconnected pore windows. The Raman results indicate that the catalyst persists pure fluorite cubic phases until the molar ratio of Mn exceeds 0.3, therefore MnO_x particles form and impede the contact of the active site and the reagent and restraining soot combustion. The doping of Nd into MnO_x-CeO_2 enhances the catalytic activity because of increased oxygen vacancy, Mn^(4+)content and stronger redox ability. Nd-doping also improves thermal stability of the catalyst due to less sintering and none phase separation after thermal aging. The fresh and aged Mn_(0.3)Ce_(0.6)Nd_(0.1)O_2 catalysts show the maximum oxidation rate for soot at 331 and 355 ℃ in the O_2/N_2 atmosphere, achieving a nearly 100% CO_2 selectivity.
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