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.
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机译：世界上四分之三的磷酸盐矿床是沉积成因的，其中75％–80％是碳酸盐脉石。在这项研究中，研究了伊朗西南部拉尔山脉的碳酸盐沉积磷酸盐矿床。这些矿床主要由方解石，氟磷灰石，石英，高岭石和伊利石组成，平均P 2 O 5 品位为9％–10％（低品位）。已经开发出各种预处理和加工方法，以将低品位的磷酸盐精矿浓缩到可销售的品位，本研究旨在选择从低品位矿石生产经济上可行的品位的磷酸盐精矿的最佳方法。在实验室和半工业规模（试点规模）上，对样品采用了不同的浓缩方法，包括煅烧和重力分离。使用煅烧（在回转窑中进行）和振动台的集成方法来浓缩低品位磷酸盐矿石，结果显示出生产30.77％P 2 O 5 < / sub>，恢复率为60.7％–63.2％。
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