Leaching of uranium and thorium from monazite: II. Elemental leaching

Details Leaching of uranium and thorium from monazite: II. Elemental leaching Leaching of uranium and thorium from monazite: II. Elemental leaching

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1879o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 7, pp.1879-1887

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Scientific paper

Data on the leaching of U and Th from monazite are analyzed by a solid-state, movingboundary diffusion model with a surface reaction boundary condition. Nonstoichiometric leaching of the actinide elements with respect to each other and to the matrix is due to different transport properties of the former in the near-surface layers of the mineral and to the interplay of the diffusion process with mineral dissolution, which causes surface motion. Surface chemical kinetics (i.e., the rate of actinide element detachment from the surface into the solution) is rapid compared to diffusion in the solid, except for Th in an annealed monazite specimen. Diffusion coefficients between 10 -23 and 10 -19 cm 2 /s are deduced from comparison of the model to the data. These mobilities represent movement of the actinide elements along various high-diffusivity pathways rather than true lattice diffusion.

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