ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 34, (1) 41 - 48 (1990)


DISSOLUTION OF THE FINE FRACTION OF JELSOVY POTOK BENTONITE IN HYDROCHLORIC AND SULPHURIC ACIDS
 
Číčel Blahoslav 1, Komadel Peter 1, Hronský Ján 2
 
1 Institute of Inorganic Chemistry, Centre of Chemical Research, Slovak Academy of Sciences, Dubravska cesta 5, 842 36 Bratislava
2 Ore Mines, n.e., 947 32 Banska Bystrica

Dissolution of ˂ 20 µm fraction of bentonite from Jelsovy Potok, Czechoslovakia, in 6 moldm⁻³ HCl and 2 moldm⁻³ H₂SO₄ is compared. The sequence of the smectite structure decomposition, the shapes of the dissolution curves, and the changes in XRD patterns and IR spectra in the course of acid dissolution are similar. Differences in the structural formulas calculated from the dissolution data are attributed to the uncertainity introduced by a slow dissolution of volcanic glass in H₂SO₄. Structural formula calculated from the dissolution in HCl expresses more correctly the montmorillonite composition as the formula calculated from the bulk chemical analysis or from the dissolution than H₂SO₄. About one third of the mass of the sample was found to be extraneous to the montmorillonite and is supposed to be bound in feldspar and mainly in a volcanic glass.


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