RESEARCH ON THE BALL MILLING AND FOLLOWED BY MICROWAVE REDUCTION OF PANZHIHUA LOW GRADE ILMENITE CONCENTRATE

摘要

In this work, the Panzhihua low grade ilmenite and graphite were milled for 1, 2,4 and 8 h firstly, then the temperature rising behavior of milled sample in microwave field were studied. The average heating rate of samples milled for 1, 2,4, 8 h were 1.86,4.08, 2.82, and 2.32 K/s; Before optimize the microwave reduction process, several experiments were conducted in order to confirm the parameters range. After milled for 4 or 8 h and reduced above 930 ℃, the Fe metallization are higher than 90%; Then the optimization was investigated by using response surface methodology (RSM), the significance of predict model and each terms were analyzed, and the optimization parameters were given as: milling time is 4 h; reduction temperature is 1001 or 1070℃; the holding time is 37.5 or 26.9 min. Under these conditions, the Fe metallization given by predict model is 91 or 92 %.