October 2017, № 9 (209)

Kushnareva O.P., Kanygina O.N. ION-EXCHANGE PROPERTIES OF NATURAL MONTMORILLONITE CLAY CONTAINING ORENBURG REGIONClays are used in the production of paper, paints, drilling fluids, cleaning of petroleum products and in many other directions. A lot of research has been done on the hydrophilic, sorption and ion-exchange properties of clay materials. However, there is very little information on the properties of clays in the Orenburg region. Of interest is the study of ion exchange processes occurring on the surface of natural non-enriched montmorillonite containing clays of the Orenburg region. The influence of high-temperature treatment on the pH and ion-exchange properties of aqueous suspensions containing particles of natural clay of the Orenburg deposit in sizes from 160 to 630 microns was investigated. In order to separate the physical and chemical processes occurring at high temperatures in clay minerals, a series of successive stepwise firing was performed in the temperature range from 300 to 900° C with a holding time of 2 hours at each temperature. The pH values of clay suspensions after this temperature action vary nonmonotonically from 8.90 in the initial sample to 12.46 after calcination at 900° C. According to the results of potentiometric titration, the ion-exchange capacity is calculated as a function of pH. When the pH is changed from 3.5 to 7, a significant increase in the ion exchange capacity is observed. The transition to the alkaline zone sharply weakens the ion-exchange properties of the clay. In the pH range from 7 to 9, ion exchange capacity is reduced and becomes insignificant. Temperature treatment does not affect the preservation of ion-exchange properties of clay. The authors convincingly explain the results obtained by the loss of moisture during heating and the phase transformations that occur, as well as the chemical composition of the clay studied. In their opinion, the presence in the clay of a large number of iron, copper and cobalt ions in an alkaline medium leads to the formation of strong hydroxocomplexes of various composition in the montmorillonite structure, which hinders ion exchange.Key words: clay, calcination, acidity, ion-exchange properties.

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About this article

Authors: Kushnareva O.P., Kanygina O.N.

Year: 2017

Editor-in-chief

Sergey Aleksandrovich
MIROSHNIKOV

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