Bench-scale flash reduction of iron ore concentrate

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Publication Type thesis
School or College College of Mines & Earth Sciences
Department Metallurgical Engineering
Author Zhang, Yao
Title Bench-scale flash reduction of iron ore concentrate
Date 2008-12
Description A bench-scale facility was used to carry out a simulated suspension reduction process with hydrogen. Experiments were performed at 1150°C, which is the highest reaction temperature that can be reached in the current facility. The iron oxide concentrates (FG3O4) provided by Ternium with a mean particle size of 34|j.m were used in the experiments. The products were analyzed by inductively coupled plasma emission spectroscopy (ICP) and X-ray diffractometer (XRD). The trend in the change of the reduction rate was observed at five different residence times: 3.5, 4, 4.5, 5, and 5.5 seconds. The reduction extent was at 21, 29, and 43% when the residence time increased from 3.5 seconds to 4 and 4.5 seconds, respectively, with 0% excess H2 and approached about 95% with 860% excess H2. The reduction extent at a longer residence time was always higher while the excess H2 ranged from 0 to 860% and only 0.5 second difference made a notable difference in the reduction rate. SEM analysis revealed the evolution of microstructure changes of samples. Experiments were also carried out to test the use of syngas (a mixture of CO and H2 within a range of compositional ratio from 1:1 to 1:3) in terms of the reduction of iron oxide concentrate and the effect of the CO/H2. About 90% reduction accomplished in 3.5 seconds at 860% excess hydrogen demonstrated a sufficiently fast reduction rate and the feasibility of using syngas instead of pure hydrogen before hydrogen becoming cheap. The results obtained in the tests clearly demonstrated the kinetic feasibility of the suspension process but large scale tests in this type of bench-scale or an industrial pilot reactor at considerably higher temperatures are needed to completely the commercial feasibility of this suspension reduction technology. An idea concerning the fabrication of an internal gas burner system is briefly discussed to solve the technical hurdle on how to supply extra heat to the current bench-scale system.
Type Text
Publisher University of Utah
Subject Iron; Metallurgy; Reduction (Chemistry)
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Relation is Version of Digital reproduction of "Bench-scale flash reduction of iron ore concentrate" J. Willard Marriott Library Special Collections TN7.5 2008 .Z48
Rights Management ©Yao Zhang
Format Medium application/pdf
Format Extent 12,891,694 bytes
Identifier us-etd2,100324
Source Original: University of Utah J. Willard Marriott Library Special Collections
Conversion Specifications Original scanned on Epson GT-30000 as 400 dpi to pdf using ABBYY FineReader 9.0 Professional Edition.
ARK ark:/87278/s6f19d7d
Setname ir_etd
Date Created 2012-04-23
Date Modified 2018-12-13
ID 192870
Reference URL