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This article in SSSAJ

  1. Vol. 28 No. 4, p. 502-506
    Received: Oct 25, 1963
    Accepted: Jan 8, 1964

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Extraction of Clay-Water Systems1

  1. J. V. Lagerwerff2



Experimental data on suspensions of Na-montmorillonite in solutions of various NaCl concentrations quantitatively confirm existing theory which predicts a gradual decrease in the extract concentration during pressure extraction (salt exclusion). This decrease is preceded by a maximum in extract concentration when salt is retained in the suspension (salt sieving). The theoretical descriptions imply a constant salt-sieving factor. A coarser filter was found to be associated with stronger salt sieving. The extract from mixed Na-Ca suspensions in chloride solutions shows an increasing concentration of Na relative to Ca during protracted extraction. Practical implications of the results are discussed.

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