Volume 14, Issue 2 (10-2006)                   www.ijcm.ir 2006, 14(2): 339-366 | Back to browse issues page

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The study of texture and different phases constituting the Jajarm Bauxite minerals in northern Khurassan, NE Iran. www.ijcm.ir 2006; 14 (2) :339-366
URL: http://ijcm.ir/article-1-681-en.html
Abstract:   (4812 Views)

The Jajarm Bauxite deposit 16 kilometers E-W trending and
overlis, the Karstic dolomite rocks of the Elika Formation. The study of
texture and different phases has been carry out in order to understand the
degree of crashing, particles size, condition of formation, degree of
crystallization, porosity, distribution of constituent elements and
beneficiation for the propose of digestion and potential of physical
beneficiation. The phase analysis indicates that the Jajarm Bauxite is typical
diasporic bauxite accompanied with Kaolinite, hematite and anatase. Hard
bauxite is the high quality bauxite with Al2O3>50% and SiO2 < 9%. Mineral
chemistry shows that out of 58% of Al2O3, 54.39% constituting diaspore
structure, 1.6% is in kaolinite and 0.94% in topaz. where as out of 5.78%
SiO2, 3.72% occurring in kaolinite structure, 1.5% as free and inactive quartz
and the rest of it is located in topaz structure. The Jajarm bauxite shows a
politomorphic, micro granular texture with several secondary textural
elements. The size of main minerals component are generally below 10
micron, with homogeneous matrix. Kaolinite minerals forms stacks of very
thin (<0.1 micron) crystal platelets. In addition, in a very hard bauxite,
separation between the crystal grains and the matrix can not be done because
of similar hardness for both with closely packed space filling and in
consequence of the missing defined borderlines of the grains. Based on the
above studies, the Jajarm bauxite can be enriched neither by grain analysis
nor by the magnetic separation. Laboratory study shows, only it can be
improve by water treatment.

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Type of Study: Research | Subject: Special

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