Study of solid mushroom formation in direct iron ore smelting reduction process using low temperature water model

2003 ◽  
Vol 30 (4) ◽  
pp. 328-336 ◽  
Author(s):  
Y. P. Hwang ◽  
C. M. Fan ◽  
Y. L. Chen ◽  
W. S. Hwang ◽  
I. G. Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Iron Ore ◽  
Reduction Process ◽  
Water Model ◽  
Smelting Reduction ◽  
Temperature Water

scholarly journals Raceway Smelting Reduction Process with Fine Iron Ore Injection from Blast Furnace Tuyeres

1993 ◽  
Vol 79 (10) ◽  
pp. 1151-1156 ◽  
Author(s):  
Kentarou NOZAWA ◽  
Koichiro SHIBATA ◽  
Masakata SHIMIZU ◽  
Heinrich Wilhelm GUDENAU
Keyword(s):  
Blast Furnace ◽  
Iron Ore ◽  
Reduction Process ◽  
Smelting Reduction ◽  
Fine Iron

scholarly journals Slag Formation during Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 935 ◽  
Author(s):  
Masab Naseri Seftejani ◽  
Johannes Schenk ◽  
Daniel Spreitzer ◽  
Michael Andreas Zarl
Keyword(s):  
Iron Oxides ◽  
Iron Ore ◽  
Hydrogen Plasma ◽  
Reduction Process ◽  
Slag Formation ◽  
Smelting Reduction ◽  
Steel Making ◽  
Reduction Of Iron ◽  
Reduction Behaviour ◽  
Continuous Feeding

Replacing carbon by hydrogen is a huge step towards reducing CO2 emissions in the iron- and steel-making industry. The reduction of iron oxides using hydrogen plasma smelting reduction as an alternative to conventional steel-making routes has been studied at Montanuniversitaet Leoben, Austria. The aim of this work was to study the slag formation during the reduction process and the reduction behaviour of iron oxides. Furthermore the reduction behaviour of iron ore during continuous feeding was assessed. Mixtures of iron ore and calcined lime with a basicity of 0, 0.8, 1.6, 2.3, and 2.9 were melted and reduced by hydrogen. The off-gas composition was measured during the operations to calculate the process parameters. The reduction parameters, namely the degree of reduction, degree of hydrogen utilisation, produced iron, and slag, are presented. The results of the batch-charged experiments showed that at the beginning of the reduction process, the degree of hydrogen utilisation was high, and then, it decreased over the operation time. In contrast, during the continuous-feeding experiment, the degree of hydrogen utilisation could be kept approximately constant. The highest degrees of reduction and hydrogen utilisation were obtained upon the application of a slag with a basicity of 2.3. The experiment showed that upon the continuous feeding of iron ore, the best conditions for the reduction process using hydrogen could be applied.

Behaviors of Chlorine in Smelting Process of Blast Furnace

2011 ◽  
Vol 396-398 ◽  
pp. 152-156 ◽  
Author(s):  
Bin Sheng Hu ◽  
Yong Liang Gui ◽  
Hua Lou Guo ◽  
Chun Yan Song
Keyword(s):  
Blast Furnace ◽  
Low Temperature ◽  
Metal Cation ◽  
Iron Ore ◽  
Reduction Process ◽  
Normal Operation ◽  
Smelting Process ◽  
Coke Reactivity ◽  
Blast Furnace Gas ◽  
Organic Speciation

The existence forms of chlorine entered into blast furnace are chloride created by Cl- and metal cation or organic speciation absorbed in specular coal or structure macromolecule of coal. The chlorine entered into blast furnace merges with blast furnace gas in the form of HCl after conducted a series of chemical reactions. With the increasing of HCl content in blast furnace gas, the coke reactivity decreases and the coke post reaction strength increases, and the reduction process of iron ore is restrained and the low temperature reduction degradation property increases. However, the corrosion of gas pipeline and TRT blade is aggravated by the HCl in blast furnace gas, and then blast furnace gas conveying process and normal operation of TRT unit are affected.

scholarly journals Multi-phase Flow Simulations in Direct Iron Ore Smelting Reduction Process

2006 ◽  
Vol 46 (8) ◽  
pp. 1158-1164 ◽  
Author(s):  
Hsin-Chien Chuang ◽  
Jer-Haur Kuo ◽  
Chien-Chia Huang ◽  
Shih-Hsien Liu ◽  
Weng-Sing Hwang
Keyword(s):  
Iron Ore ◽  
Reduction Process ◽  
Phase Flow ◽  
Smelting Reduction ◽  
Flow Simulations ◽  
Multi Phase Flow ◽  
Multi Phase

scholarly journals Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 272 ◽  
Author(s):  
Deqing Zhu ◽  
Jianlei Chou ◽  
Benjing Shi ◽  
Jian Pan
Keyword(s):  
Low Temperature ◽  
Shaft Furnace ◽  
Reduction Rate ◽  
Reduction Process ◽  
Smelting Reduction ◽  
Temperature Reduction ◽  
Corex Shaft Furnace ◽  
Reducing Conditions ◽  
Before And After ◽  
Low Temperature Reduction

COREX (Coal-Reduction-Extreme) smelting reduction process provides a sustainable developing way for ironmaking industry, but the sources of iron ore materials restrict its development in China. Meanwhile, the application of sinter, which is marked by low manufacture cost and overcapacity in China, to COREX furnace faced proportion limitation due to its worse low temperature reduction degradation performance. This work explored the influence of MgO content on the low-temperature (550 °C) reduction of sinter in reducing conditions simulating COREX shaft furnace. The mineralogical change of sinter containing different content of MgO before and after reduction was analyzed by X-ray diffraction (XRD), optical microscopy, and scanning electron microscopy for revealing the action mechanism of MgO on the low-temperature-reduction of sinter. The results show that increasing MgO (1.36–3.10%) improved the low temperature reduction degradation performance of sinter, and decreased its reduction degree and reduction rate at low temperature. More MgO the sinter contained, less Fe2O3 and SFCA was observed in sinter. Meantime, less Fe2O3 was reduced and the generation of innerstress was restrained during reduction process. The improved RDI (reduction degradation index) in COREX process of sinter by increasing MgO content is a comprehensive result of lowering strength and inhibiting probable reduction of sinter.

scholarly journals Slag Formation During Reduction of Iron Oxide Using Hydrogen Plasma Smelting Reduction

2020 ◽  
Author(s):  
Masab Naseri Seftejani ◽  
Johannes Schenk ◽  
Daniel Spreitzer ◽  
Michael Andreas Zarl
Keyword(s):  
Iron Oxides ◽  
Iron Ore ◽  
Hydrogen Plasma ◽  
Reduction Process ◽  
Slag Formation ◽  
Smelting Reduction ◽  
Steel Making ◽  
Reduction Of Iron ◽  
Reduction Behaviour ◽  
Continuous Feeding

Replacing carbon by hydrogen is a huge step towards reducing CO2 emissions in the iron- and steel-making industry. The reduction of iron oxides using hydrogen plasma smelting reduction as an alternative to conventional steel-making routes has been studied at Montanuniversitaet Leoben, Austria. The aim of this work was to study the slag formation during the reduction process and the reduction behaviour of iron oxides. Furthermore, the reduction behaviour of iron ore during continuous feeding was assessed. Mixtures of iron ore and calcined lime with a basicity of 0, 0.8, 1.6, 2.3, and 2.9 were melted and reduced by hydrogen. The off-gas composition was measured during the operations to calculate the process parameters. The reduction parameters, namely the degree of reduction, degree of hydrogen utilisation, produced iron, and slag, are presented. The results of the batch-charged experiments showed that at the beginning of the reduction process, the degree of hydrogen utilisation was high, and then, it decreased over the operation time. In contrast, during the continuous-feeding experiment, the degree of hydrogen utilisation could be kept approximately constant. The highest degrees of reduction and hydrogen utilisation were obtained upon the application of a slag with a basicity of 2.3. The experiment showed that upon the continuous feeding of iron ore, the best conditions for the reduction process using hydrogen could be applied.

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