Effect of oxidation roasting on ilmenite flotation
More details
Hide details
Amirkabir University of Technology
Mehdi Irannajad   

Department of Mining and Metallurgical Eng., Amirkabir University of Technology, Tehran, Iran
Publication date: 2014-01-06
Physicochem. Probl. Miner. Process. 2014;50(2):493–505
In this study, the oxidation roasting was used to modify the ilmenite chemistry to improve the collector adsorption and ilmenite flotation behavior. The results indicated that the increase of the roasting temperature up to 600°C increased the ilmenite flotation recovery. The maximum collector adsorption density occurred on ilmenite roasted at 600 °C which resulted in the increase of ilmenite flotation recovery from 73.5% to 91% at pH 6.3. This improvement was attributed to a greater conversion of Fe2+ to Fe3+ ions and significant decrease in the zeta potential of ilmenite. At the roasting temperatures of 750°C and 950°C, ilmenite was converted to rutile and some trivalent iron containing phases such as hematite and pseudobrookite. Under these conditions, the collector adsorption and hence ilmenite flotation improved, however the flotation recovery decreased after the roasting at 950°C.