Redox Equilibrium of Niobium in Calcium Silicate Base Melts
Redox Equilibrium of Niobium in Calcium Silicate Base Melts
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DOI：
10.1007/s11663-010-9386-0
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
A.-M. Mirzayousef-Jadid;K. Schwerdtfeger
中科院分区：
文献类型：
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作者：
A.-M. Mirzayousef-Jadid;K. Schwerdtfeger
在1873 K（1600 °C）下，在CaO/SiO_2（质量百分数）分别为0.66、0.93和1.10，Nb_2O_5（初始）为5.72 ~ 11.44%的CaO-SiO_2-Nb_2O熔体中，测定了铌的氧化态。炉渣样品用受控氧压的气相平衡，然后骤冷至室温并进行化学分析。铌主要是五价的，少量是四价的。结果发现，Nb 5 +/Nb 4+的比例增加与氧压在一个恒定的CaO/SiO2比和恒定的总铌含量，密切根据理想的质量作用定律，这是成正比的比例也增加与总铌含量，它似乎有一个最大值在碱度约0.93。本文描述了固化渣样品的颜色，并借助透射光谱进行了解释。
The oxidation state of niobium has been determined at 1873 K (1600 °C) in CaO-SiO2-NbOxmelts with CaO/SiO2ratios (mass pct) of 0.66, 0.93 and 1.10, and 5.72 to 11.44 pct Nb2O5(initial). The slag samples were equilibrated with gas phases of controlled oxygen pressure, then quenched to room temperature and analyzed chemically. The niobium is mainly pentavalent with small amounts in the tetravalent state. It was found that the Nb5+/Nb4+ratio increases with oxygen pressure at a constant CaO/SiO2ratio and constant content of total niobium, closely according to the ideal law of mass action, which is proportional toThe ratio also increases with total niobium content, and it seems to have a maximum at a basicity of about 0.93. The color of the solidified slag samples is described and is explained with the help of transmission spectra.