Mechanism of Phase Formation in the Batch Mixtures for Slag-Bearing Glass Ceramics - 12207
- SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 (Russian Federation)
Slag surrogate was produced from chemicals by heating to 900 deg. C and keeping at this temperature for 1 hr. The product obtained was intermixed with either sodium di-silicate (75 wt.% waste loading) or borax (85 wt.% slag loading). The mixtures were heat-treated within a temperature range of 25 to 1300 deg. C. The products were examined by X-ray diffraction and infrared spectroscopy. The products prepared at temperatures of up to 1000 deg. C contained both phase typical of the source slag and intermediate phases as well as phases typical of the materials melted at 1350 deg. C such as nepheline, britholite, magnetite and matrix vitreous phase. Vitrification process in batch mixtures consisting of slag surrogate and either sodium di-silicate or sodium tetraborate runs through formation of intermediate phases mainly silico-phosphates capable to incorporate Sm as trivalent actinides surrogate. Reactions in the batch mixtures are in the whole completed by ∼1000 deg. C but higher temperatures are required to homogenize the products. If in the borate-based system the mechanism is close to simple dissolution of slag constituents in the low viscous borate melt, then in the silicate-based system the mechanism was found to be much complicated and includes re-crystallization during melting with segregation of newly-formed nepheline type phase. (authors)
- Research Organization:
- WM Symposia, 1628 E. Southern Avenue, Suite 9-332, Tempe, AZ 85282 (United States)
- OSTI ID:
- 22293502
- Report Number(s):
- INIS-US-14-WM-12207; TRN: US14V1157115026
- Resource Relation:
- Conference: WM2012: Waste Management 2012 conference on improving the future in waste management, Phoenix, AZ (United States), 26 Feb - 1 Mar 2012; Other Information: Country of input: France; 7 refs.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ACTINIDES
BEARINGS
BORAX
CERAMICS
DISSOLUTION
GLASS
HEAT TREATMENTS
INFRARED SPECTRA
MAGNETITE
MELTING
MIXTURES
PHOSPHATES
RECRYSTALLIZATION
SEGREGATION
SILICATES
SLAGS
WASTES
X-RAY DIFFRACTION