Abstract
The dissolution of chrysotile is studied in regard to the surfaces analysis by photoelectron spectrometry. After leaching of chrysotile (Provenance: Thetford; about 200 mg of fibers of 1 cm length) in nonstirred 0.1 N oxalic conditions, the composition of the mineral surfaces is determined by XPS; kinetic curves of dissolution are given in the range 22–80°C.
Two conditions for the rate-limiting step are involved for the explanation of the dissolution: diffusion of Mg2+ through the fibrous gel or dissociation of chrysotile. By the former, some values of the diffusion coefficient are proposed: D varies from 5·10−19 cm2s−1 to 5·10−16 cm2s−1, in the range 22–80°C. By the second model, the leaching rate is estimated from 3 Å (22°C) per h to 250 Å (80°C) per h. For the 2 models, the activation heat energy is in the range 15–20 Kcal.
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Thomassin, J.H., Goni, J., Baillif, P. et al. An XPS study of the dissolution kinetics of chrysotile in 0.1 N oxalic acid at different temperatures. Phys Chem Minerals 1, 385–398 (1977). https://doi.org/10.1007/BF00308848
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DOI: https://doi.org/10.1007/BF00308848