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度要求较高[40]. 而后,Hylsa公司又基于HYL-Ⅲ工艺开发了HYL-ZR工艺,该工艺可以直接使用焦炉煤气,煤制气等富氢气体,为富煤缺气的地区发展气基直接还原工艺开辟了新路径. 与Midrex工艺相比,采用V(H2)/V(CO)=1的煤制气生产1 t海绵铁产品,还原气消耗量增加约100 m3,而能量利用率提高约3.3%[35].周渝生等[44]认为,中国的能源结构适合发展以煤气为气源的气基直... ℃条件下还原钛铁矿,反应初始的1 h时间内,低H2压力下还原反应速率更高,随着反应的进行,则需要提高H2压力才能保持与初始相当的还原反应速率. ZHAGN等[66]采用H2辅助镁热还原TiO2制备了钛金属粉末.由于钛对氧具有极强的亲和力,Mg难以直接还原TiO2,而高温条件下Ti-H-O固溶体稳定性低于Ti-O固溶体,因此,可采用H2气氛增强Mg与Ti-O反应的热力学驱动力,通过镁的进一步脱氧作用......
forces from rock blocks. Cutters today can either incorporate hard, fine grained carbides into the matrix of the disc material or apply a hardened coating of alloy powder on the steel substrate... used on rock kerfing and drilling research. Of those laser systems. CO2, MIRCAL, COIL and the Nd:YAG are the four most widely used. Figure 10 Schematic of a typical laser showing the basic components......