Abstract

TANG, H.; FU, X.; QIN, Y.  and  QI, T.. Iron recovery and phosphorus removal from oolitic high-phosphorus haematite using the FASTMELT^® process: a comparative study of two reductants. J. S. Afr. Inst. Min. Metall. [online]. 2017, vol.117, n.4, pp.387-395. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2017/v117n4a11.

The FASTMELT^® process was developed as an alternative to blast furnace ironmaking; in this process, high-quality molten iron is produced using direct reduction followed by high-temperature slag/metal separation. In this study, iron recovery and phosphorus removal from oolitic high-phosphorus haematite using the FASTMELT^® process was investigated. The performance of two reducing agents, coal and wood char, was compared. Direct reduction experiments indicated that with optimized reductant addition, the ore-char and ore-coal briquettes attained metallization values of 82% and 78%, respectively, and residual carbon contents of 0.24 and 2.35%, respectively. The slag/metal separation experiments revealed that molten iron containing 0.41% phosphorus and 0.021% silicon (by mass) was produced from optimally reduced ore-char briquettes, and molten iron containing 0.78% phosphorus and 0.91% silicon from optimally reduced ore-coal briquettes. The study indicates that carbonaceous materials with high CO₂ reactivity are suitable for use in the FASTMELT^® process for phosphorus removal and iron recovery from oolitic high-phosphorus haematite.

Keywords : Keywords High-phosphorus haematite; FASTMELT; reductant; coal; wood char; phosphorus removal.

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