Relationship Between Sulfide Capacity and Structure of MnO-SiO<sub class="a-plus-plus">2sub>-Al<sub class="a-plus-plus">2sub>O<sub class="a-plus-plus">3sub>-Ce<sub class="a-plus-plus">2sub>O<sub class="a-plus-plus">3sub> System
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- 作者：Se Ji Jeong ; Tae Sung Kim ; Joo Hyun Park
- 刊名：Metallurgical and Materials Transactions B
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：48
- 期：1
- 页码：545-553
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology;
- 出版者：Springer US
- ISSN：1543-1916
- 卷排序：48
文摘
Sulfide capacity of the MnO-SiO<sub>2sub>-Al<sub>2sub>O<sub>3sub>-Ce<sub>2sub>O<sub>3sub> system was measured at 1873 K (1600 °C), and the structural analysis was carried out using micro-Raman spectroscopy to understand the role of Ce<sub>2sub>O<sub>3sub> in the sulfur dissolution behavior. Sulfide capacity of the basic melts (MnO/SiO<sub>2sub> = 2.2(±0.14)) decreased with increasing content of Ce<sub>2sub>O<sub>3sub> to approx. 4 mol pct, beyond which it increased. Sulfide capacity continuously decreased in the less basic system (MnO/SiO<sub>2sub> = 1.0(±0.15)), whereas it was hardly affected by Ce<sub>2sub>O<sub>3sub> in the relatively acidic composition (MnO/SiO<sub>2sub> = 0.3(±0.05)). There was a significant increase in the intensity of Raman band at 600 cm−1 by Ce<sub>2sub>O<sub>3sub> addition in high MnO/SiO<sub>2sub> (=2.2) system, which originated from the transition from [(Al,Mn<sub>0.5sub>)O<sub>4sub>]-tetrahedron to [(Al,Ce)O<sub>6sub>]-octahedron due to strong attraction between Al<sub>2sub>O<sub>3sub> and Ce<sub>2sub>O<sub>3sub>. Combining thermodynamic and structural information, the effect of Ce<sub>2sub>O<sub>3sub> on the sulfide capacity of Mn-aluminosilicate melts can be explained by the following factors: (1) Activity of MnO in the melts decreased by addition of Ce<sub>2sub>O<sub>3sub>; (2) Free oxygen was consumed in the structure modification from [(Al,Mn<sub>0.5sub>)O<sub>4sub>] to [(Al,Ce)O<sub>6sub>] unit by addition of Ce<sub>2sub>O<sub>3sub>; and 3) When the Ce3+ content was greater than critical value (approx. 4 mol pct) in high MnO/SiO<sub>2sub> (=2.54) melts, excess Ce3+ and Mn2+ ions competitively reacted with S2−sup> ions, resulting in an increase of sulfide capacity.