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BENEFICIATION AND MULLITIZATION OF MISHIDOVAN ANDALUSITE
https://doi.org/10.17073/1683-4518-2014-8-14-21
Abstract
The results of mineralogical studies by XRD, XRF and thin section techniques showed that the main minerals of the deposits (Bafgh -Yazd region containing 5-10 percent silimanite minerals group, with 18-20 % Al2O3) were quartz, silimanite, mica (biotite and moscovite), garnet, kyanite, andalusite and some opaque minerals. Mineral processing studies showed that the kyanite concentrate from this ore could be obtained using different methods such as magnetic separation, vibrating table and flotation. The results of experiments showed that a concentrate of 42 % Al2O3 with 54 % recovery was obtained, using vibrating table. In order to separate iron-bearing minerals (Fe2O3 contents to less than 1 %), the concentrate was processed by high intensity magnetic separation, which increased the Al2O3 contents to 62 %.
Applying flotation method to the fine fraction of the sample (75-150 pm) a concentrate containing 46,3 % Al2O3, with a recovery of 47,56 %, was obtained. The process of mullitization of kyanite concentrate was also studied at different conditions of heat treatment (1400-1600 °C and 0,5-3,5 hours) and particle size (38-300 pm). The results of microstructure and phase evolution studies by SEM and XRD showed that total transformation of kyanite to mullite took place by heat treatment between 1500-1550 °C during 2,5 hours. At 1550 °C, the rate of mullitization and densification were improved by decreasing particle size of materials from 300 to 38 pm. Ill. 10. Ref. 20. Tab. 10.About the Authors
A. NamiranianIran, Islamic Republic of
M. Kalantar
Iran, Islamic Republic of
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Supplementary files
For citation: Namiranian A., Kalantar M. BENEFICIATION AND MULLITIZATION OF MISHIDOVAN ANDALUSITE. NOVYE OGNEUPORY (NEW REFRACTORIES). 2014;(8):14-21. https://doi.org/10.17073/1683-4518-2014-8-14-21
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