Mössbauer and X-ray Diffraction Spectroscopy of High-Iron Bauxites from Kazakhstan
Shokanov A. Vereshchak M. Manakova I. Migunova A.
October 2023Multidisciplinary Digital Publishing Institute (MDPI)
Materials
2023#16Issue 20
The bauxite ores of Kazakhstan were analyzed using Mössbauer spectroscopy, X-ray diffraction and an X-ray fluorescence analysis. Experimental data on the structural–phase composition of bauxites were obtained, and the features of the iron-bearing minerals within them were revealed. The studied bauxites were high in iron. The magnetic part of bauxite was mainly represented by aluminohematite with a concentration of CAl = 3.34–5.73 at.%, alongside goethite in small amounts. The predominant phase in the bauxite samples was the alumina-bearing mineral gibbsite with a well-crystallized monoclinic lattice. The main siliceous mineral of bauxite is kaolinite, which showed distorted octahedral positions in a number of samples. Siderite amounts were found to vary in the range of 0–15 at.% in the present iron-bearing minerals. Ilmenite was also present in the bauxite of some deposits; anatase was found in all bauxites and was the final product of ilmenite decomposition in the weathering crust.
bauxite , Mössbauer spectroscopy , X-ray diffraction
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Abai Kazakh National Pedagogical University, Dostyk Av. 13, Almaty, 050010, Kazakhstan
Institute of Nuclear Physics, Ibragimov St. 1, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Al-Farabi Av. 71, Almaty, 050040, Kazakhstan
Abai Kazakh National Pedagogical University
Institute of Nuclear Physics
Al-Farabi Kazakh National University
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