Extraction of exchangeable potassium from montmorillonite
2000
Cumakov, A. | Hrnciarova, K. (Slovenska Akademia Vied, Bratislava (Slovak Republic). Ustav Anorganickej Chemie)
Potassium saturated 2 micro m fraction of a bentonite was used in this study. Electro-ultrafiltration (EUF) method was applied for potassium extraction. This method allows to extract separately various potassium fractions, bound on the mineral with different strengths, by varying the extraction parameters (voltage and temperature). We have found that appropriate modification of the extraction procedure allows to extract subfractions of exchangeable potassium differently bound on the fine fraction of bentonite. Extractions were performed at various temperatures (20, 40, 80 deg C) and voltages (from 50 to 400 V). Over 85 % of total potassium present in the sample was extracted within 105 min. We have ascertained that potassium occurs in the 2 micro m fraction dispersed in water in at least two subfractions.
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