Thermal conductivity of polyhalite and anhydrite from the site of the proposed waste isolation pilot plant
The study of the thermal conductivity of rocksalt and other geologic materials by Sweet and McCreight has been extended to include polyhalite and anhydrite from the WIPP 28 and AEC 7 wells, respectively, located at the site of the proposed Waste Isolation Pilot Plant (WIPP) near Carlsbad, NM. The anhydrite changed to a lighter color upon heating, and exhibited a lower conductivity when measured again. The data were fitted to an expression for thermal conductivity, lambda = lambda/sub 300/(300/T)/sup ..gamma../, in which lambda/sub 300/ is the cnductivity at 300/sup 0/K and T the temperature in K. For polyhalite lambda/sub 300/ = 1.3 W/m K, and ..gamma.. = 0.35 in the range 300 to 528/sup 0/K. For fresh anhydrite lambdalambda/sub 300/ = 4.5 W/m K and ..gamma.. = 1.15 in the range 300 to 630/sup 0/K. A rerun on the same anhydrite sample yielded lambda/sub 300/ = 3.5 W/m K and ..gamma.. = 1.00 in the range 300 to 725/sup 0/K. Another anhydrite sample, heated for 24 h at 723/sup 0/K, had an even lower conductivity - 2.5 and 2.1 W/m K at 328 and 348/sup 0/K, respectively. The recommended thermal conductivity parameters for thermal modeling are: polyhalite, ..gamma.. = 0.35, lambda/sub 300/ = 1.4 +- 0.2 W/m K; anhydrite, ..gamma.. = 1.15, lambda/sub 300/ = 4.7 +- 0.2 W/m K.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6335997
- Report Number(s):
- SAND-81-0856; ON: DE81024046
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
ANHYDRITE
CALCIUM COMPOUNDS
CALCIUM SULFATES
GEOLOGIC DEPOSITS
HIGH TEMPERATURE
MEDIUM TEMPERATURE
MINERALS
NEW MEXICO
NORTH AMERICA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SALT DEPOSITS
SOUTHWEST REGION
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
USA