Experimental Research on the Novel Process of Iron Ore Direct Reduction by Coal Gas

Abstract:

In this paper, the direct reduction of iron ore pellets was carried out by simulating the typical gas composition in coal gasification process, Midrex and Hyl Ⅲ process, the influence of gas composition and temperature on reduction was studied. Results show that the proportion of H2 increasing is helpful to improve the reduction rate, while when H2/CO>1.6, changes of H2 content will have very little influence on it. Appropriate reduction temperature is about 950°C, higher temperature(1000°C) may unfavorably slowed the reduction rate. From the kinetics analysis at 950°C and 1000°C, when H2/CO=0.4 the prophase of reduction course (~90%) is likely controlled by interfacial chemical reaction mechanism and in the later controlled by gaseous diffusion mechanisms. However, when H2/CO>0.4 the whole reduction course is likely controlled by interfacial chemical reaction mechanism. The reaction rate constant (k) and effective diffusion coefficient (De) at 950°C are both better than those at 1000°C. Research also shows that the coal-water slurry gasification based on Texaco furnace is more suitable for iron ore direct reduction than other coal gasification processes.

• Periodical: Advanced Materials Research (Volumes 311-313)
• Pages: 891-897
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.311-313.891
• Online since: August 2011
• Authors: Ling Yun Yi, Zhu Cheng Huang, Hu Peng, Tao Jiang
• Keywords: Coal Gas, Gas-Based Direct Reduction, Iron Ore Pellets, Reduction Kinetics

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