Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

Nakano, Jinichiro; Duchesne, Marc; Bennett, James P.; Kwong, Kyei‐Sing; Nakano, Anna; Hughes, Robin W.

doi:10.1016/j.fuel.2014.11.008

Cited by 30 publications

(12 citation statements)

References 13 publications

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“…The elemental composition of slag sample is listed in Table 1. Synthetic slags for this investigation were prepared following a procedure used by Nakano [24]. Reagent grade powders of respective oxides (Al, Ca, Fe, Si and V) were heated at 1425 °C for S1-7, 1575 °C for S8-12, and 1500 °C for the T1-4 series in a 64 mol.% CO -36 mol.% CO 2 atmosphere for 3 days, followed by water quench.…”

Section: Sample Preparationmentioning

confidence: 99%

Analysis of slags using laser-induced breakdown spectroscopy

Sanghapi

Ayyalasomayajula

Yueh

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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The feasibility of laser induced breakdown spectroscopy (LIBS) for the analysis of gasification slags was investigated by comparing LIBS results to the results of an ICP-OES analyzer. A small amount of slag sample was placed on a piece of double sided adhesive tape attached to a glass microscope slide and analyzed for Al, Ca, Fe, Si, and V which are major elements found in slags. The partial least squares regression (PLS-R) and univariate simple linear regression (SLR) calibration methods indicated that apart from V (accuracy upto + 20%) the accuracy of analysis varies within 0.35-6.5% for SLR and 0.06-10% for PLS-R. A paired-sample t-test within the 95% confidence level yielded p-values greater than 0.05, meaning no appreciable statistical difference was observed between the univariate SLR with internal standardization and the multivariate PLS-R for most of the analytes. From the results obtained in this work, LIBS response varies depending on the element and the technique used for quantitative analysis. Simultaneous use of the univariate calibration curves with internal standard (intensity ratio) and PLS regression in multi-elemental analysis can help reduce the matrix effect of slags associated to their high variation in concentration. Overall, these results demonstrate the capability of LIBS as an alternative technique for analyzing gasification slags. Estimated limits of detection for Al, Ca, Fe, Si and V were 0.167, 0.78, 0.171, 0.243 and 0.01 wt%, respectively.

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Section: Sample Preparationmentioning

confidence: 99%

Analysis of slags using laser-induced breakdown spectroscopy

Sanghapi

Ayyalasomayajula

Yueh

et al. 2016

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Both the FeOÁV 2 O 3 spinel and V 2 O 3 is formed when the Fe to V molar ratio is larger than 2 ([67.6 mass% V 2 O 3 ) [15]. V 2 O 3 (karelianite) can also form solid solutions with Al and Fe [16][17][18][19][20]. CaO decrease the melting point of V 2 O 3 and the spinel [21,22].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Al2O3, CaO and SiO2 on the Phase Relationship in FeO–SiO2 Based Slag with 20 Mass% Vanadium

Lindvall¹,

Berg

Sichen

2016

J. Sustain. Metall.

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An innovative and sustainable way for production of vanadium (V) is to co-process V titanomagnetite ores with V-bearing steel slag, via reduction. V-slag produced from highly enriched Fe-V melt contains as high as 20 mass% V. The phase relationship in FeO-SiO 2 based slag with V fixed at 20.4 mass% was investigated experimentally at 1673 K. The compositions covered the normal production range, viz. Al 2 O 3 from 0 to 6 mass%, CaO from 1 to 5 mass% and SiO 2 from 10 to 17 mass%. The content of MnO was fixed at 5.5 mass%. Samples quenched at 1673 K were found to be solid-liquid mixtures, either in a 2-phase region consisting of liquid and a solid spinel phase, or in 3-phase region consisting of liquid, spinel phase and silica phase. Free silica was only found in samples with a composition of 0 mass% Al 2 O 3 , 1 mass% CaO and 17 mass% SiO 2. Formation of free silica was prohibited in samples with 1 mass% CaO and up to 17 mass% SiO 2 by adding 5 mass% Al 2 O 3. Addition of 4 mass% Al 2 O 3 was also sufficient to prevent the presence of free silica in samples with 3 mass% CaO and 13.5 mass% SiO 2. Most of the V was kept in the spinel phase, while the solubility of V in the liquid was generally less than 1 mass% as V 2 O 3. Fe, Mn and Al coexisted in both liquid phase and spinel phase. On the other hand, Si and Ca only distributed in the liquid phase. The fraction of solid phase, viz. spinel was found to decrease with increasing SiO 2 content.

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“…The V slags were found to be solid-liquid mixtures, either in a two-phase region consisting of a liquid and a solid spinel phase, or in threephase region consisting of liquid, spinel phase, and free silica. Spinel and/or karelianite precipitation in V-saturated slags [10][11][12][13][14][15] results in a sharp increase of the slag viscosity [14], which has been reported to have an impact on the extraction efficiency of V [16]. Studies on phase relationships of V slags will render a fundamental foundation toward the development of a V-extraction method from hot metal highly enriched in V.…”

Section: Introductionmentioning

confidence: 99%

Vanadium Extraction from a Fe–V (2.0 Mass%)–P (0.1 Mass%) Melt and Investigation of the Phase Relations in the Formed FeO–SiO2-Based Slag with 20 Mass% V

Lindvall¹,

Tikka

Berg

et al. 2017

J. Sustain. Metall.

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An innovative and sustainable way for production of vanadium is to co-process vanadium titanomagnetite ores with vanadium-bearing slag from steel industry, via reduction, producing a hot metal containing about 2 mass% vanadium, 0.1 mass% phosphorus, and 0.4 mass% silicon. A vanadium-extraction method was developed for these hot metals using a semi-industrialscale converter. Oxidation was carried out with an air jet enriched to 50 vol% oxygen and by top-charging up to 70 kg iron ore pellets per ton hot metal. The complete dissolution of pellets was achieved by deliberately creating good stirring conditions utilizing high momentary decarburization rates. The temperature could be controlled to around 1677 K at the blowing endpoint after the pellet coolant had been dissolved. Produced vanadium slags contained as high as 20 mass% V. The semifinished product contained about 3 mass% carbon and 0.1 mass% vanadium, corresponding to a vanadium yield of 94%. The phosphorus distribution to the slag was low when good stirring was maintained. The slag composition had a more significant impact than the temperature on the vanadium distribution. Laboratory-scale study also showed that the temperature impact on the composition of the liquid phase was minor.

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Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

Cited by 30 publications

References 13 publications

Analysis of slags using laser-induced breakdown spectroscopy

Analysis of slags using laser-induced breakdown spectroscopy

The Effect of Al2O3, CaO and SiO2 on the Phase Relationship in FeO–SiO2 Based Slag with 20 Mass% Vanadium

Vanadium Extraction from a Fe–V (2.0 Mass%)–P (0.1 Mass%) Melt and Investigation of the Phase Relations in the Formed FeO–SiO2-Based Slag with 20 Mass% V

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