The Influence of UV-Treatment of Clay Deposits Catoca and Catete (Angola) on the Composition and Concentration of Cation in the Filtrate

The paper presents the results of studies of the effect of ultraviolet activation (UV-activated) of natural clay deposits Catoca and Catete (Angola). There were given data of X-ray diffraction data of original and washed clays, in which revealed the presence in them of clay materials, such as kaolinite, montmorrilonite, saponte, illite. There were described some features of kaolinite, montmorrilonite, illite. It was noticed that clay materials are capable of cation exchange by isomorphic substitution in tetrahedral of crystalline lattices of minerals. During experiments was showed that UV-irradiation of clay leads to their activation. This is confirmed by difference in cation composition of water extracts in which the cation content of Na⁺, K⁺, Ca²⁺, Mg²⁺ was higher in the case, if the clay was subjected to activation. Wherein content of ions of Ni²⁺ and Cu²⁺ was lower in the UV-treated clays. The maximum effect of leaking in aqueous medium of clay deposits for Catoca by ions Ca²⁺ (51,1 %), and for clay deposits Catete by ions Na²⁺ (15,1 %).  For solutions containing cation Na²⁺, the maximum effect was observed on the washout for cation Al³⁺ (25,0 %) for clay deposits Catoca, and for cation Na²⁺ (55,6) – for clay deposits Catete. For solutions containing cation Ca²⁺, the maximum effect of washout on clays deposits Catoca fixed for cation K⁺ (80,9 %), for clays of deposits Catete either for cation K⁺ (31.6%). Difference in the percentage yield of cation in the solutions, apparently, can be explained by the difference in the composition of clays.

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