A model for the leaching of major inorganics from retorted Rundle oil shale

Krol A.A., Bell P.R.F. and Greenfield P.F. (1993) A model for the leaching of major inorganics from retorted Rundle oil shale. Water Research, 27 2: 277-291. doi:10.1016/0043-1354(93)90087-X

Author Krol A.A.
Bell P.R.F.
Greenfield P.F.
Title A model for the leaching of major inorganics from retorted Rundle oil shale
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0043-1354(93)90087-X
Open Access Status Not yet assessed
Volume 27
Issue 2
Start page 277
End page 291
Total pages 15
Subject 1904 Performing Arts and Creative Writing
2300 Environmental Science
1900 Earth and Planetary Sciences
Abstract A model is developed to describe the leaching of major soluble inorganics (the sulphate and chloride salts of calcium, magnesium, sodium and potassium) from processed oil shale sourced from the Rundle resource, Queensland, Australia. The model accounts for rapid dissolution of readily soluble salts, the formation of non-charged ion pairs in solution, cation exchange and slow dissolution/precipitation of calcium sulphate (anhydride/gypsum). Leachate results from an experiment involving irrigation of an initially dry column of processed shale are used to validate the model. A piston model is used to account for unsaturated water flow, and this is expressed in the water quality model by a moving bottom boundary condition. Tracer experiments show that a good basis for the leaching model is the classic convection-dispersion model. A moving node finite element method is used to obtain a numerical solution to this leaching model. The model provides a good description of the leaching of each inorganic species. Deviations between model predictions and experimental results are greatest at slower flowrates and for monovalent cations. It is concluded that the main chemical mechanisms controlling leaching of major inorganics from processed shale have been identified.
Keyword chemical equilibria
finite element
oil shale
retorted shale
salt transport
unsaturated flow
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
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