Ceramics-Silikáty 44, (3) 86 - 90 (2000) |
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RHEOLOGY OF SPINEL SLUDGE IN MOLTEN GLASS |
Míka Martin 1, Hrma Pavel 2, Schweiger Michael J. 2 |
1 Department of Glass and Ceramics, Institute of Chemical Technology,
Technická 5, 16628 Prague, Czech Republic
2 Pacific Northwest National Laboratory, Richland, Washington 99352, U.S.A.
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Spinel sludge, which forms while vitrifying high-level waste, obstructs the flow of molten glass and damages the melter. The
effectiveness of removing spinel sludge from a high-level waste glass melter depends on its rheological behavior. We prepared
spinel sludge in a laboratory crucible by allowing spinel to settle from molten glass and measured the response of the sludge
to shear using a rotating spindle viscometer. The shear stress increased nonlinearly with the velocity gradient (the shear rate)
and with time at a constant velocity gradient, as is typical for a pseudoplastic rheopectic liquid. The apparent viscosity of the
sludge substantially increased when RuO₂ needles were present. |
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