Full text
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| Author(s): |
Julián Andrés Mendez Garcés
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2000-06-14 |
| Examining board members: |
Henrique Kahn;
Lilia Mascarenhas Sant Agostino;
Helmut Born
|
| Advisor: | Henrique Kahn |
| Abstract | |
This work presentes the results of the mineralogical and technological characterization studies of the major podiform chromite ore deposits from the Camagüey Province, Republico f Cuba. Firstly are shown a review of the geology of the chromite deposits from Camagüey Province, the chromium spinels mineralogy and the major uses and specification of chromite concentrates, as well as applied mineralogical and mineral dressing studies of cheromite ores. Samples from the four major deposits were collected for mineralogical and technological studies Camagüey I, Camagüey II, Mamina e Victoria. These samples were processed in the laboratory through a standard procedure to allow a comparison of the results. It was applied a textural analysis by microscopy, followed by comminution, size screening and mineral separations by heavy liquid and Frantz magnetic separator. Scanning eléctron microscopy studies were performed on thin polished sections of particulate material. The attained products were appraised, both from the point of view of their physical behavior as well as their chemical characteristics and internal structure. Chemical analyses were done by X-ray fluorescence technique and the mineralogical studies by X-ray diffraction coupled optical microscopy and scanning eléctron microscopy/EDS. The studied samples are highly fractured in different degree from one to anothe ore deposit due to the tectonical events. The gangue minerals serpentine, chlorite and dolomite are partly deeply associated to the chromite micro-fractures. A physical separation process, essentially by gravity methods, would allowed to remove substantial part of the gangue minerals; the final products will be very similar for all the studied ores, giving the following grades: 35%\'Cr IND.2\'\'O IND.3\', 29%\'Al IND.2\'\'O IND.3\', 16%\'Fe IND.2\'\'O IND.3\', 16,5%-17,5%MgO, 1,4%-2,3%Si\'O IND.2\' e 0,2%-0,8%CaO. (AU) | |