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Thesis Advisor刘淑娟
Degree Grantor中国科学院研究生院
Other AbstractThe sticking problem and the reduction rate of iron ore powders have been carefully investigated with the gas mixture systems of CO-N_2 and CO-H_2-N_2 in the high temperature fluidized-bed. The sticking mechanism of iron ore has also been studied in detail. The following results have been found in the experiment: Under a certain range of experimental conditions, carbon cracked from C_2H_2 can be deposited on the surface of iron ore uniformaly. The reduction rate of iron ore adhering carbon is much faster than that of iron ore, for example, the reduction degree of iron ore powders adhering carbon (the weight of adhering carbon is 12.85%) car reach 77.16% when it is reduced 5 minutes, and that of iron ore powders only reach 71.56% when it is reduced 40 minutes. The sticking problem car be effectively solved by depositing carbon on the surface of iron ore. There is no sticking problem when iron ore powders adhering a certain amount of carbon are reduced up to over 90%(reduction degree). the sequence of factors influenced the reduction rate and sticking has also been studied by means of orthogonal design nd analysis of variance. We have concluded that the important factors influencing reduction rate are temperature and amount of carbon deposited on the surface of iron ore powders. The sticking process of Anshan iron ore and Anshan iron ore adhering carbon has been carefully observed and studied by means of photo of physical examination. The above studies have provided fundamental data for large-scale smelting reduction experiment and reactor design.
Document Type学位论文
Recommended Citation
GB/T 7714
郝际斌. 流化床预还原铁矿粉防粘的研究[D]. 中国科学院研究生院,1991.
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