Distribution Ratio of Sulfur between CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>O-TiO<sub>2</sub> Slag and Carbon-Saturated Iron
oleh: Kanghui Zhang, Yanling Zhang, Tuo Wu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2018-12-01 |
Deskripsi
To explore the feasibility of hot metal desulfurization using red mud, the sulfur distribution ratio (<i>L</i><sub>S</sub>) between CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>O-TiO<sub>2</sub> slag and carbon-saturated iron is evaluated in this paper. First, the theoretical liquid areas of the CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> (-Na<sub>2</sub>O-TiO<sub>2</sub>) slag are discussed and the fluxing effects of Al<sub>2</sub>O<sub>3</sub>, Na<sub>2</sub>O, and TiO<sub>2</sub> are confirmed. Then, <i>L</i><sub>S</sub> is measured via slag-metal equilibrium experiments. The experimental results show that <i>L</i><sub>S</sub> significantly increases with the increase of temperature, basicity, and Na<sub>2</sub>O content, whereas it decreases with the increase of Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> content. Na<sub>2</sub>O in the slag will volatilize with high temperatures and reducing conditions. Furthermore, based on experimental data for the sulfur distribution ratio between CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>O-TiO<sub>2</sub> slag and the carbon-saturated iron, the following fitting formula is obtained: <inline-formula> <math display="inline"> <semantics> <mrow> <mi>log</mi> <msub> <mi>L</mi> <mi>S</mi> </msub> <mo>=</mo> <mn>45.584</mn> <mi>Λ</mi> <mo>+</mo> <mfrac> <mrow> <mn>10568.406</mn> <mo>−</mo> <mn>17184.041</mn> <mi>Λ</mi> </mrow> <mi>T</mi> </mfrac> <mo>−</mo> <mn>8.529</mn> </mrow> </semantics> </math> </inline-formula>