High‐temperature mass spectrometric study of the vaporization processes in the system CaO‐MgO‐Al2O3‐Cr2O3‐FeO‐SiO2

Wang, Lijun; Stolyarova, V. L.; Лопатин, С. И.; Seetharaman, Seshadri

doi:10.1002/rcm.4127

Cited by 12 publications

(10 citation statements)

References 19 publications

(26 reference statements)

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“…Cr, CrO, and CrO 2 ) were detected within the temperature range of 1950 K (1677°C) to 2050 K (1777°C). According to the reactions mentioned in the previous section as well as in our earlier publication, [12] the only possible source for CrO 2 is Cr 2 O 3 in accordance with reaction [5].…”

Section: B Vaporization Methodsmentioning

confidence: 94%

“…The ratio of the corresponding partial pressures of CrO 2 and CrO is estimated to be 1:2 [12,13] in a wide temperature range. The occurrence of CrO 2 among the vapor species was attributed solely because of the double decomposition of Cr 2 O 3 .…”

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

“…The partial pressure of CrO is attributed to CrO 1.5 and to CrO in the condensed phase. [12,13] The vaporization capacity in slag is assumed to be the same as that for the reference substance, viz. Cr 2 O 3 in generating gaseous species of CrO and Cr, The contributions of CrO and CrO 1.5 to the partial pressure of CrO thus would be reflected in the X CrO /X CrO1.5 ratio in the condense phase.…”

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

“…The detailed information about the principle and the apparatus are described in an earlier publication by the present authors. [12] To orient the readers, a brief description of the principles involved and the procedure adopted for the investigation are outlined subsequently. Tungsten cells were used, and solid Cr 2 O 3 was used as a reference material.…”

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

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Experimental Studies on the Oxidation States of Chromium Oxides in Slag Systems

Wang

Seetharaman

2010

Metall Mater Trans B

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In view of the importance of the thermodynamic behavior of chromium in the slag phase as well as the serious discrepancies in the earlier reports on the valence state of chromium in slag melts, the oxidation state of chromium oxides in CaO-SiO 2 -CrO x and CaO-MgO-(FeO-) Al 2 O 3 -SiO 2 -CrO x were investigated experimentally in the present study using two different experimental techniques. The gas-slag equilibrium technique was adopted to study the CaO-SiO 2 -CrO x system between 1823 K (1550°C) and 1923 K (1650°C) and equilibrated with mixtures of CO-CO 2 -Ar gases corresponding to three different oxygen partial pressures (between 10 À4 and 10 À5 Pa). After equilibrating, the samples were quenched and subjected to analysis using the X-ray absorption near edge structure method to determine the distribution ratio of Cr 2+ /Cr 3+ in the slags. The second technique examined the applicability of the high-temperature mass spectrometric method combined with the Knuden effusion cell for quantifying the valence states of Cr in the multicomponent system CaO-MgO-(FeO-) Al 2 O 3 -SiO 2 -CrO x up to a maximum temperature of 2000 K (1727°C). The results showed that the Knudsen cell-mass spectrometric method could be used successfully to estimate the valence ratio for Cr in silicate melts. According to the present study, the Cr 2+ /Cr 3+ ratio increased with increasing temperature and a decreasing slag basicity as well as the oxygen partial pressure prevailing in the system. A mathematical correlation of X CrO /X CrO1.5 as a function of temperature, oxygen partial pressure, and basicity was developed in the present work based on the present results as well as on those assessed from earlier data.

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Section: B Vaporization Methodsmentioning

confidence: 94%

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

Section: B Technique Ii-mass Spectrometry Methodsmentioning

confidence: 99%

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Experimental Studies on the Oxidation States of Chromium Oxides in Slag Systems

Wang

Seetharaman

2010

Metall Mater Trans B

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“…-the study of vaporization processes and thermodynamic properties of slags containing heavy metals (Cr and V) for optimization of metallurgical processes and for its carrying out in the safety environmental conditions [82,83].…”

Section: Application Of the Approaches Discussed For The Development mentioning

confidence: 99%

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Stolyarova¹

2013

TOTHERJ

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Abstract:The unique opportunities and features of high temperature mass spectrometric method for study vaporization processes and thermodynamic properties of oxide systems and materials (glasses, ceramics and coatings) were considered. Various types of vapour species were found over oxide systems studied such as the associated, dissociated and polymerized products of vaporization. The regularities of the vaporization of the binary and multicomponent oxide systems according to the position of oxide modifier in the Periodic table of atoms were illustrated and discussed from the point of view of the acid-base concept. Results on determination of thermodynamic functions in oxide systems were considered taking into account the main requirements for the confirmation of their reliability. Thermodynamic functions of oxide systems studied showed various signs of the deviations from the ideality. The general lattice theory of associated solutions was used for the calculation of thermodynamic properties of the ternary silicate melts studied. Based on this theory the correlation between thermodynamic functions obtained in the systems under consideration and the number of various types of bonds formed in these melts was illustrated. Using this approach the different levels of deviations from the ideality in the melts studied were clarified. Examples of the practical applications of high temperature mass spectrometry for developing advanced materials were shown.

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Current literature in mass spectrometry

2009

J. Mass Spectrom.

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High‐temperature mass spectrometric study of the vaporization processes in the system CaO‐MgO‐Al₂O₃‐Cr₂O₃‐FeO‐SiO₂

Cited by 12 publications

References 19 publications

Experimental Studies on the Oxidation States of Chromium Oxides in Slag Systems

Experimental Studies on the Oxidation States of Chromium Oxides in Slag Systems

High Temperature Mass Spectrometric Study of Thermodynamic Properties and Vaporization Processes of Oxide Systems: Experiment and Modeling

Current literature in mass spectrometry

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