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Minerals 2015, 5(3), 367-379; https://doi.org/10.3390/min5030367

Beneficiation of Low-Grade Phosphate Deposits by a Combination of Calcination and Shaking Tables: Southwest Iran

1
Department of Geology, Sari branch, Islamic Azad University, Sari 4816119318, Iran
2
School of Mining Engineering, University of Tehran, Tehran 1439957131, Iran
3
Department of Geology, Science & Research Branch, Islamic Azad University, Tehran 1477893855, Iran
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Kota Hanumantha Rao
Received: 2 May 2015 / Revised: 12 June 2015 / Accepted: 19 June 2015 / Published: 25 June 2015
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Abstract

Three quarters of the world’s phosphate deposits are of sedimentary origin and 75%–80% of those include carbonate gangue. In this study, carbonate sedimentary phosphate deposits of the Lar Mountains of southwest Iran are studied. These deposits consist mainly of calcite, fluorapatite, quartz, kaolinite and illite, with an average P2O5 grade of 9%–10% (low-grade). Various pre-processing and processing methods have been developed for concentrating low-grade phosphate up to marketable grade and this study aims to select the optimal method to produce an economically viable grade of phosphate concentrate from low-grade ore. Different concentration methods, including calcination and gravity separation, were applied on samples at both a laboratory and semi-industrial scale (pilot scale). Using an integrated method of calcination (performed in a rotary kiln) and shaking table for concentrating the low-grade phosphate ore, the results show promise at producing grades of 30.77% P2O5 with 60.7%–63.2% recovery. View Full-Text
Keywords: calcination; Iran; low-grade phosphate ore; phosphate deposit; rotary kiln; shaking table calcination; Iran; low-grade phosphate ore; phosphate deposit; rotary kiln; shaking table
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shariati, S.; Ramadi, A.; Salsani, A. Beneficiation of Low-Grade Phosphate Deposits by a Combination of Calcination and Shaking Tables: Southwest Iran. Minerals 2015, 5, 367-379.

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