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High purity iron is obtained from vanadium-titanium magnetite (VTM) byone-step coal-based direct reduction-smelting process with coal as reductantand sodium carbonate (Na2CO3) as additives. Industrial experiments show thatthe process of treating molten iron with a large amount of Na2CO3 is effectivein removing titanium from molten iron. However, the studies are rarelyconducted in thermodynamic relationship between titanium and other componentsof molten iron, under the condition of a large amount of Na2CO3 additives. Inthis study, through the thermodynamic database software Factsage8.0, theeffects of melting temperature, sodium content and oxygen content on theremoval of titanium from molten iron are studied. The results of thermodynamiccalculation show that the removal of titanium from molten iron needs to beunder the condition of oxidation, and the temperature should be below thecritical temperature of titanium removal (the highest temperature at whichtitanium can be removed). Relatively low temperature and high oxygen contentcontribute to the removal of titanium from molten iron. The high oxygen contentis conducive to the simultaneous removal of titanium and phosphorus from molteniron. In addition, from a thermodynamic point of view, excessive sodiumaddition inhibits the removal of titanium from molten iron.

Thermodynamic Analysis of Titanium Removal from Molten iron Smelted with Large Amounts of Sodium Additives