Abstract
The samples belong to low grade siliceous collophanite. Main useful mineral is cellophane and main gangue minerals are quartz , calcite and dolomite. The grade of P2O5 is 21.98% and the grade of SiO2 is 31.34%. Through the straight-reverse flotation, the phosphate concentrates with a grade of 27.68% and the recovery of 83.04% were obtained. The content of MgO is 0.92% in phosphate concentrates.
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