Leach testing of waste forms: interrelationship of ISO- and MCC-type tests

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Leach testing experiments were conducted on SYNROC-D material to examine the parameters which affect leaching results and to measure the activation energy for leaching of elements from SYNROC-D. Measured leach rates were found to be controlled by precipitation of insoluble phases for those tests where the sample surface area to volume of leachant (SA/V) multiplied by leaching time (t) exceeded 0.3 cm{sup -1}d for leach tests at 90{sup 0}C. In these cases the apparent activation energy for leaching was approximately 10 kcal/mole based on Na and Si data. For leach tests at 90{sup 0}C with (SA/V)(t) less than 0.2 cm{sup ... continued below

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39 p.

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Oversby, V.M. May 14, 1982.

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Leach testing experiments were conducted on SYNROC-D material to examine the parameters which affect leaching results and to measure the activation energy for leaching of elements from SYNROC-D. Measured leach rates were found to be controlled by precipitation of insoluble phases for those tests where the sample surface area to volume of leachant (SA/V) multiplied by leaching time (t) exceeded 0.3 cm{sup -1}d for leach tests at 90{sup 0}C. In these cases the apparent activation energy for leaching was approximately 10 kcal/mole based on Na and Si data. For leach tests at 90{sup 0}C with (SA/V)(t) less than 0.2 cm{sup -1}d, the activation energy for Na and Si dissolution was 18.5 kcal/mole for sample S29 and 14.5 kcal/mole for sample LS04. These activation energies are in agreement with values reported by Tole and Lasaga (1981) for nepheline dissolution. The effect of sample geometry was investigated by leaching a series of crushed samples of different grain size. The results support the view that geometric surface area should be used in leach rate calculations rather than gas adsorption BET surface area. Comparison of results on S29 leaching of crushed samples and monoliths show that data from MCC-1 and ISO type leach tests may be directly compared when the data are examined at constant (SA/V)(t).

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39 p.

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NTIS, PC A03/MF A01; OSTI as DE82015716

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  • Materials Characterization Center workshop on leaching, Gaithersburg, MD (United States), 19-21 May 1982

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  • Other: DE82015716
  • Report No.: UCRL--87621
  • Report No.: CONF-820570--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 59250
  • Archival Resource Key: ark:/67531/metadc693315

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  • May 14, 1982

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 17, 2016, 1:09 p.m.

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Oversby, V.M. Leach testing of waste forms: interrelationship of ISO- and MCC-type tests, article, May 14, 1982; California. (digital.library.unt.edu/ark:/67531/metadc693315/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.