Abstract:
For the concentrate of Indonesian sand mine containing vanadium and titanium, the process of direct reduction by rotary hearth furnace and melting separation by electric furnace was adopted to complete the small-scale basic test and the pilot test successively. The metallized pellets could be obtained with the average metallization rate of 88.63% and carbon content of 4.81% by pilot test under the conditions of the mixed material ratio of the sea sand concentration, semi-coke, bentonite and organic binder at the ratio of 100:25:3:1, the thickness of containing coal pellets of 3 layers (54 mm), rotary hearth furnace roasting temperature of 1 260 ℃, reduction time of 30 minutes. Then the hot metallized pellets were fed into a 300 kVA electric furnace for smelting. The iron containing V could be obtained with TFe grade of 96.25%, iron recovery of 99.64%, V grade of 0.443% and V recovery of 88.96%. The grade of TiO
2 in slag is 38.86%, and the recovery of titanium is 98.95%. The results showed that the technology of direct reduction by RHF and melting by electric furnace was feasible.