ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 44, (3) 86 - 90 (2000)


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.

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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