Measurement and Prediction of Low-Rank Coal Slag Viscosity

Streeter, R.C.; Diehl, E. K.; Schobert, Harold H.

doi:10.1021/bk-1984-0264.ch012

Cited by 10 publications

(4 citation statements)

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“…The agreement is generally good; this shows a good reproducibility of results obtained in the same laboratory over a time period of a year. A Beulah slag had also been studied by Streeter and co-workers as part of their extensive study of viscosity of low-rank coal ash slags. − The comparison is shown in Figure . In this case, the measurements were made in different laboratories by different operators, albeit with similar Haake rotational viscometers, approximately 15 years apart.…”

Section: Resultsmentioning

confidence: 99%

Effects of Atmosphere on Viscosity of Selected Bituminous and Low-Rank Coal Ash Slags

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Schobert

2004

Energy Fuels

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The viscosities of nine coal ash slags were measured in air as a function of temperature. Selected slags were also tested in reducing atmosphere and in air with 10% water vapor. In air, the viscosities of the slags can be related to the mole ratio of basic to acidic oxides. An improved fit is obtained from the ratio of oxide ions contributing to the bases to the oxide contributing to the acids. The change in viscosity observed in using hydrogen instead of air appears to be related to the amount of iron originally in the slag. When water vapor is present in air, the viscosity of a high-silica glassy slag decreased. The viscosities of three other slags, with lower silica content, increased slightly, with the increase in potassium content. In the former case, water likely enters the slag and disrupts Si−O−Si bridges. In the latter case, water may form metal−hydroxide complexes with the alkali cations such as potassium. A second effect of water vapor is to reduce the temperature at which the slag begins to crystallize (the temperature of critical viscosity). These effects of water on coal ash slag viscosity are similar to those on magmas, even if with lower magnitude.

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Section: Resultsmentioning

confidence: 99%

Effects of Atmosphere on Viscosity of Selected Bituminous and Low-Rank Coal Ash Slags

and

Schobert

2004

Energy Fuels

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“…Nonetheless, the slag can retain Newtonian properties below the temperature of critical viscosity [81]. It is also possible to find non-Newtonian behavior below the temperature of critical viscosity; thus, pseudoplastic and thixotropic behavior was found at the higher viscosities in almost all the slags studied by Streeter et al [81]. 17 , which brings about a decrease in viscosity.…”

Section: Estimation Of Slag Propertiesmentioning

confidence: 93%

“…Traditionally, the straight-line portion of the logarithm of viscosity vs. temperature curve in a slag system is designated 'Newtonian region' of slag behavior, whereas the region below the temperature of critical viscosity is designated 'plastic region'. Nonetheless, the slag can retain Newtonian properties below the temperature of critical viscosity [81]. It is also possible to find non-Newtonian behavior below the temperature of critical viscosity; thus, pseudoplastic and thixotropic behavior was found at the higher viscosities in almost all the slags studied by Streeter et al [81].…”

Section: Estimation Of Slag Propertiesmentioning

confidence: 96%