2014
DOI: 10.1179/1743281214y.0000000180
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Effect of water vapour content in H2–H2O–CO–CO2mixtures on activity of iron oxide in slags relevant to novel flash ironmaking technology

Abstract: As an integral part of developing a novel flash ironmaking technology at the University of Utah, the activity of iron oxide in the slag was studied under three different gas atmospheres: H 2 /H 2 O (H 2 ), CO/CO 2 /H 2 /H 2 O (reformed natural/coal gas), and CO/CO 2 . The conditions of the slags investigated were MgO-saturated CaO-FeO-Al 2 O 3 -SiO 2 -MnO (0?2-0?8 wt-%)-P 2 O 5 (0?1-0?9 wt-%) in the temperature range 1550-1600uC with wt-% CaO/wt-% SiO 2 of 0?8 to 1?2, and under pO 2 52610 210 -2610 29 atm. Wat… Show more

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Cited by 23 publications
(22 citation statements)
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“…The solubility of water in various slags has been studied by many researchers [31][32][33][34][35][36][37][38][39][40][41]. In this work, the effects of the water vapor on the equilibrium distribution of elements such as sulfur [42,43], phosphorus [7,42], and manganese [44] in addition to the effects on the activities of iron and magnesium oxides were investigated [6,45,46]. In slag, silicate anions are composed of silicon cations surrounded by four oxygen anions forming tetrahedral units.…”
Section: Slag Chemistrymentioning
confidence: 99%
See 1 more Smart Citation
“…The solubility of water in various slags has been studied by many researchers [31][32][33][34][35][36][37][38][39][40][41]. In this work, the effects of the water vapor on the equilibrium distribution of elements such as sulfur [42,43], phosphorus [7,42], and manganese [44] in addition to the effects on the activities of iron and magnesium oxides were investigated [6,45,46]. In slag, silicate anions are composed of silicon cations surrounded by four oxygen anions forming tetrahedral units.…”
Section: Slag Chemistrymentioning
confidence: 99%
“…This suggests that water affects the slag more significantly than CO 2 when they coexist in the gas mixture [6,57]. Water vapor was found to be advantageous for lowering FeO in slag [46], and manganese [44]. Moreover they found that water vapor in the atmosphere of the new process would keep lining wear low based on the low MgO solubility in slag under its expected operating conditions [45].…”
Section: Slag Chemistrymentioning
confidence: 99%
“…A large portion of these problems are due to the use of coke to start with and the needs of sintering, pelletization, and cokemaking steps associated with the blast furnace operation. A novel flash ironmaking process is under development at the University of Utah, [1][2][3][4][5][6][7] in which iron ore concentrate is flash reduced by gaseous reductants at temperatures above about 1473 K (1200°C). This flash ironmaking process eliminates sintering, pelletization, and cokemaking steps of the blast furnace and other ironmaking processes, making it more energy efficient and drastically lowering the emissions of environmental pollutants, especially carbon dioxide.…”
Section: Introductionmentioning
confidence: 99%
“…It was then stored in a desiccator with dry powders of SiO 2 (99.995% pure), Al 2 O 3 (99.99% pure), MgO (99.99% pure), MnO (99% pure), FeO (99.95% pure), Ca 2 P 2 O 7 (≥99.9% pure), FeS (≥99.98% pure), and Fe (≥99.99% pure). Pure water (99.9997%) was used to prevent any scale formation in the system . To prepare the master slag, predetermined amounts of CaO, SiO 2 , Al 2 O 3 , MgO, and MnO dry powders were added into magnesia crucibles (4 cm OD, 7.6 cm height, 0.3 cm wall thickness) supplied by Ozark Technical Ceramics, Inc. (Webb City, MO) for premelting and magnesia presaturation at 1600 °C for 5 h under ambient atmosphere.…”
Section: Methodsmentioning
confidence: 99%