Structural and morphological characteristics of layered hydroaluminosilicates activated by solutions of alkali metal chlorides

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 38-49 p.
This study presents the results of a comparative investigation into the chemical and mineralogical compositions, as well as the structural-morphological characteristics of enriched and modified forms of clay, which contains layered hydroaluminosilicate – montmorillonite – as its main mineral phase. Impurity minerals in the clay raw material include kaolinite, low-temperature trigonal quartz, calcite, and illite, whose presence is confirmed by transmission electron microscopy and infrared Fourier spectrometry. Activation of the enriched rock was performed by treating it with solutions of alkali metal chlorides – lithium, potassium, and sodium chlorides. It is shown that the original form of the clay does not contain Na2O and Li2O oxides. However, through the salt treatment of the enriched hydroaluminosilicate rock, products with a content of lithium, sodium, and potassium oxides were obtained, amounting to 1.96%, 3.98%, and 6.28% by mass, respectively. It is established that the treatment with potassium chloride solution has the most significant influence on the structural-morphological characteristics of montmorillonite clay. Specifically, the sample treated with KCl solution exhibits an increased tendency towards particle aggregation and the formation of relatively large, spherical grains. It is also shown that the activated product mentioned above is almost entirely devoid of the mineral phase known as calcite. Meanwhile, the impact of LiCl and NaCl salt solutions on the enriched clay raw material hardly alters the microstructure of the resulting products.
Keywords:
layered hydroaluminosilicates, montmorillonite, modification, alkali metals, IR-spectroscopy, electron microscopy
Dudina S.N.
Candidate of Engineering Sciences (Ph.D.), Belgorod State National Research Universty
Korolkova S.V.
Candidate of Engineering Sciences (Ph.D.), Belgorod State National Research University
Volovicheva N.A.
Candidate of Engineering Sciences (Ph.D.), Belgorod State National Research Universty
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Dudina S.N., Korolkova S.V., Volovicheva N.A. Structural and morphological characteristics of layered hydroaluminosilicates activated by solutions of alkali metal chlorides. Chemical Bulletin. 2023. 6 (2). P. 38 – 49.