关键词: 钛铁粗精矿, 赤铁矿, 还原焙烧, 磁选

Abstract: The occupation rate of Ti-containing minerals in ilmenite rough concentrate of Malawi beach sand is more than 95%. But the content of TiO2 is only 42.71% due to the obvious hematitization alteration of some ilmenite. In order to determine the beneficiation and quality improvement process of ilmenite roughing concentrate， the ilmenite roughing concentrate obtained from the beach sand in this area after the treatment of gravity separation and magnetic separation process were regarded as research object. The process of beneficiation and smelting was optimized through detailed process mineralogy and condition tests. The best reduction conditions for the roasting test of ilmenite roughing concentrate were the reduction roasting temperature of 875 ℃， the reduction time of 12.5 min， and the dosage of reducing agent of 5%. One weak magnetic coarse separation and medium magnetic scavenging were adopted for roasted ores. Finally， the ilmenite concentrate with TiO2 content of 49.05% and TiO2 recovery rate of 77.16%， and iron concentrate with Fe content of 49.73% and Fe recovery rate of 34.61% were obtained. The TiO2 content increased from 42.71% to 49.05%， and the concentrate quality was greatly improved. The combined process is simple and free of agent pollution， which can provide a technical way for the effective utilization of the refractory ilmenite roughing concentrate resources.

Key words: Ilmenite roughing concentrate, Hemetite, Reduction roasting, Magnetic separation