Novelty on reduction of raw and pre-oxidised titaniferous magnetite ore with boiler grade coal

作者：Sarkar B. K.^*; Samanta S.; Dey R.; Das G. C.

来源：Ironmaking and Steelmaking, 2018, 45(5): 469-477.

DOI：10.1080/03019233.2017.1286545

• Titaniferous magnetite ore
• pre-oxidation
• boiler grade coal
• carbothermal reduction

Pre-oxidation of fines of magnetite containing materials is usually carried out to get better yield of metals. Titaniferous magnetite ore (TMO) is one kind of low-grade iron ore (around 45-50% of total Fe) with a significant amount of TiO2 (23.23%) and V2O5 (0.403%). TMO fines have been pre-oxidised at 973 K (700 degrees C) for 9 h under air atmosphere. The effect of reduction of raw TMO fines as well as the pre-oxidised TMO fines using boiler grade coal in the form of cylindrical briquettes has been studied in the temperature range of 1273 K (1000 degrees C) to 1473 K (1200 degrees C) for periods of 10, 20, 30, 40 and 60 min to estimate the relative yield of iron. The influence of temperature and time on reduction experiments has also been investigated with XRD, FESEM analyses along with chemical analysis of the reduced samples. The most novel result is that the yield of Fe by direct reduction of raw TMO (92.42%) is even marginally better than that of reduction of pre-oxidised TMO (90.89%) at 1473 K (1200 degrees C) for 60 min. Thus the single-step reduction of raw TMO is techno-economically more viable than the pre-oxidation followed by reduction technique.

• 出版日期2018