Experimental study on the coarse-grinding and flotation of the coking middlings

The heavy medium coking middlings of -3mm size from TunLan Coal Preparation Plant were taken as the study sample. The MiniFlex600 X-ray powder diffractometer and the OLYMPUS BX51 microscope were applied to analyze the phase composition and the mineral dissemination features of the coal samples respectively. Besides, the flotation tests of grinding products were conducted. Results show that when the content of -0.074mm size is 67.32%, with one roughing and one cleaning floatation process, clean coal with the ash content of 11.64% and the yield of 34.75% could be recycled under the condition of collector dosage of 200g/t and frother dosage of 50g/t.