图书来源:二元合金相图及中间相晶体结构 二元合金相图及中间相晶体结构
作 者:唐仁政 田荣璋
出版时间:2009-05
定 价:320元
图书ISBN:978-7-81105-831-4
出版单位:中南大学出版社
Xin-guo Si 1,2),Xiong-gang Lu 1),Chuan-wei Li 1),Chong-he Li 1),and Wei-zhong Ding 1) 1) Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,Shanghai University,Shanghai 200072,China 2) Hebei Iron and Steel Group Tangshan Steel Company,Tangshan 063020,China
摘 要:The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200°C.The microstructure and phase transition of the reduction products were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and optical microscopy(OM).It was found that the weight loss and iron metallization rate increased with the increase of reduction temperature and reaction time.The iron metallization rate could reach 87.5% when the sample was reduced at 1150°C for 80 min.The final phase constituents mainly consist of Fe,M 3 O 5 solid solution phase(M=Mg,Ti,and Fe),and few titanium oxide.Microstructure analysis shows that the surfaces of the reduction products have many holes and cracks and the reactions take place from the exterior of the grain to its interior.The kinetics of reduction indicates that the rate-controlling step is diffusion process control with the activation energy of 89 kJ·mol-1.
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