Abstract
Five typical bauxite samples from three ore deposits from the wider area of Grebnik Mt. (Metohija, Serbia) were examined with the optical microscopic, X-ray powder diffraction (XRPD) and chemical methods. The occurrences in bauxites were studied and described and the presence of major minerals was determined: diaspore, boehmite and hematite; minor minerals: quartz, goethite, rutile, kaolinite and hydro-hematite; as well as anatase, brookite, magnetite and chromite, which occur only sporadically. According to the quantity of main Al-bearers, three types of bauxite ore were recognized: diaspore, boehmite and boehmite-diaspore. Unit cell dimensions of major minerals were determined, mostly with values within reference data. However, all of the studied hematites have smaller a0 and V0 values, most probably due to the substitution of Fe3+ by Al3+. All samples are further classified as iron-rich and ferritic bauxites. It was found that there were changes in origin conditions between major Al-hydroxides minerals and hematite, as well as between the diaspore and boehmite. Determined chemical compositions put this raw material into high-quality raw materials for obtaining the electro corundum and alumina. The synthesis of the obtained data indicate that Grebnik?s bauxites have some unique characteristics, more or less different from most of the World?s known bauxite ore deposits.
Highlights
Bauxite resources are the most important ores of aluminium, due to Al-hydroxide minerals, such as gibbsite [Al(OH)3], boehmite [γ-AlO(OH)] and diaspore [α-AlO(OH)], together with the iron ore minerals hematite and goethite, kaolinite, quartz and small amounts of rutile and anatase (TiO2)
Bauxite deposits are commonly classi ied in three genetic types, i.e. lateritic, karst, and Tikhvin-type, according to mineralogy, chemistry and host-rock lithology (BÁRDOSSY & ALEVA, 1990)
The aim of this paper is to present in detail the mineralogical, crystallographic and chemical characteristics of ive bauxite samples from three Grebnik’s ore deposits
Summary
Bauxite resources are the most important ores of aluminium, due to Al-hydroxide minerals, such as gibbsite [Al(OH)3], boehmite [γ-AlO(OH)] and diaspore [α-AlO(OH)], together with the iron ore minerals hematite and goethite, kaolinite, quartz and small amounts of rutile and anatase (TiO2). (latitude: N 42° 33’ 36’’, longitude: E 20° 36’ 0’’) in the eastern part of the Metohija basin, 30km east of Peć city within the territory of Klina municipality. Up to now, these bauxites were studied by many authors, and the level of examinations in this area is relatively very high. Many articles have been published on the geological setting, structure of the ore deposits and occurrences, stratigraphic position, space arrangement, thickness and metallogenic characteristics of the bauxites the mineralogical and especially the crystallographic characteristics of the bauxites has received very little attention
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