고온 황화반응에 의한 FeTiO3로부터 Fe의 분리성과 분배거동에 미치는 환원/황화 분위기 및 온도의 영향
Influence of Reduction Atmosphere and Temperature on the Separability and Distribution Behavior of Fe from FeTiO3 via Sulfurization
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티타늄 생산 원료로서 TiO2는 천연 일메나이트 광석을 1823 K 이상에서 탄소와 함께 환원 및 산 침출을 통해 티타늄이 풍부한슬래그로부터 생산할 수 있으나, 공정상 매우 높은 에너지 소비 및 다량의 침출 잔류물을 발생한다. 본 연구에서는 1573 K 이하 온도에서 Na2SO4에 의해 FeTiO3의 황화 처리를 통해서 철 자원은 FeS 황화물 상으로써 티타늄 자원은TiO2-Na2O계 산화물 상으로분리할 수 있는 반응을 제안한다. 본 연구는 FeTiO3의 황화 처리의 기초 연구로서, FeS 황화물 상과 TiO2계 슬래그 상의 분리성에미치는 환원 분위기의 영향과 대기 분위기 속에서 반응온도와 Sulfur 비에 따른 Fe, Ti, Na 등의 거동을 조사하였다. 1573 K 및 탄소 포화 조건에서 FeTiO3의 Fe는 Fe-C-S 금속과 일부 FeS로 분리 가능하며, 산화물 내 농도는 4 mass% 정도로 감소하였다. 또한, Sulfur/Fe 비가 높아질수록 자성 분리 후 회수된 산화물의 Fe 농도가 증가하며, 회수된 금속상 내 Fe 농도는 감소하였다.
Abstract
TiO2 as a raw material for producing titanium can be produced by carbon reduction of natural ilmenite ores over 1823 K and acid leaching of the obtained titanium-rich slag. However, the conventional process can cause very high energy consumption and a large amount of leaching residues. In the present study, we proposed the sulfurization of FeTiO3 with Na2SO4 at temperatures below 1573 K, which can separate Fe in FeTiO3 as the FeS based sulfide phase and Ti as the TiO2-Na2O based oxide phase. This study is a fundamental study for sulfurization of FeTiO3 to investigate the influence of reducing atmosphere, reaction temperature and the sulfur/Fe ratio on the separability and distribution behaviors of of Fe, Ti, and Na between the oxide phase and the sulfurized phase. At 1573 K and carbon saturation condition, the Fe can be separated from FeTiO3 as Fe-C-S metal and a part of FeS, and the concentration of Fe in oxide decreased to 4 mass% after sulfurization.
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