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首页> 外文期刊>ISIJ international >Thermodynamic Study on CaO-SiO2-Al2O3-5%MgO-10%Ce2O3 Slag System: Liquide Lines and Distribution Behavior of Cerium at 1873 K
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Thermodynamic Study on CaO-SiO2-Al2O3-5%MgO-10%Ce2O3 Slag System: Liquide Lines and Distribution Behavior of Cerium at 1873 K

机译：CaO-SiO 2 -al 2 O 3 -5％MgO-10％CE 2 o的热力学研究 3 渣系统：1873 k铈的液化线和分布行为

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摘要

The liquidus of CaO-SiO_(2)-Al_(2)O_(3)-MgO (5mass%)-Ce_(2)O_(3) (10mass%) system at 1873 K was determined under the reducing atmosphere by adopting the equilibrium and quench method. Furthermore, the thermodynamic activities of Ce_(2)O_(3) in the melts and the cerium distribution ratio between slag and liquid tin were measured at 1873 K by chemical equilibrium method. By using the measured activity data, an empirical formula was proposed to estimate the activity coefficient of Ce_(2)O_(3). From the formula, it was found that Al_(2)O_(3) behaved like basic oxide in this system. In addition, for the melts with the same Ce_(2)O_(3) contents, the activity coefficient of Ce_(2)O_(3) increase gradually with the increase of the basicity of the melts. This implies that the increase of the basicity is favorable to the enrichment and precipitation of Ce-containing mineral phases. Finally, an empirical formula was introduced to express the relationship between the cerium distribution ratio and the composition of melts. It was found that the cerium distribution ratio decreased gradually with the increase of the basicity of the melts, which means that decrease of the basicity is beneficial to the recovery of cerium from liquid metal phase.
机译：在减少气氛下采用1873 k的CAO-SiO_（2）-A1（2）O_（3）-MGO（5mass％） - CE_（2）O_（3）系统（10mass％）系统通过采用平衡和淬火方法。此外，通过化学平衡法在1873K下测量熔体和液体锡之间的Ce_（2）O_（3）的热力学活性和炉渣与液体锡之间的铈分配比。通过使用测量的活动数据，提出了经验公式来估计CE_（2）O_（3）的活动系数。从公式中，发现AL_（2）O_（3）表现得像该系统中的碱性氧化物。另外，对于具有相同CE_（2）O_（3）内容物的熔体，CE_（2）O_（3）的活性系数随着熔体的碱度的增加而逐渐增加。这意味着碱度的增加有利于含Ce矿物阶段的富集和沉淀。最后，引入了经验公式以表达铈分配比与熔体组成之间的关系。发现铈分配比随着熔体的碱度的增加而逐渐降低，这意味着碱度的降低有利于来自液态金属相的铈的回收率。

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