Optical Basicity Analysis of Vanadium-Bearing Silicate Glasses/Melts
Optical Basicity Analysis of Vanadium-Bearing Silicate Glasses/Melts
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含钒硅酸盐玻璃/熔体的光学碱度分析
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
H. Farah
中科院分区：
文献类型：
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作者：
H. Farah
通过对Na_2 O基和CaO基Al_2O_3-SiO_2玻璃/熔体中钒的氧化还原分析，研究了玻璃组成与光学碱度的关系。在氧化/还原气氛和温度范围内平衡总共73个样品，随后分析所得淬火玻璃/熔体的组成。还检查了玻璃的光学吸收随玻璃组成和部分氧气氛的颜色变化。然后使用文献中报道的方法计算淬火玻璃/熔体的光学碱度，并在熔化期间随着玻璃组合物、氧化/还原气氛和温度的变化进行检查。开发了一种关系来表示氧化还原离子（V3+、V4+和V5+）的浓度在平衡常数和计算的玻璃/熔体的光学碱度方面的比率。氧化还原比与计算的光学碱度的变化趋势是相似的钙和钠硅酸盐熔体/玻璃。与钠和硅酸钙系列中的V3+/V4+相比，V4+/V5+平衡更受计算的光学碱度的变化的影响。从坩埚氧化铝饱和度不影响计算的硅酸钠玻璃的光学碱度，虽然有相应的氧化还原比的变化。使用不同的实验参数的结果进行了比较，并在玻璃生产（包括那些用于生物医学应用）和钒的提取冶金是有用的。
The relationship between glass composition and optical basicity was studied by redox analysis of vanadium in Na2O- and CaO-based Al2O3–SiO2 glasses/melts. A total of 73 samples were equilibrated over a range of oxidizing/reducing atmospheres and temperatures, and the composition of resulting quenched glasses/melts was subsequently analyzed. Optical absorption of the glasses was also examined for color change with the glass composition and the partial oxygen atmosphere. The optical basicity of the quenched glass/melts was then calculated using the method reported in literature and examined with change in the glass composition, oxidizing/reducing atmosphere, and temperature during melting. A relationship was developed to express the ratio of the concentrations of the redox ions (V3+, V4+, and V5+) in terms of the equilibrium constant and the calculated optical basicity of the glass/melt. The trends in change in the redox ratios with the calculated optical basicity were similar in both calcium and sodium silicate melts/glasses. The V4+/V5+ equilibrium was more affected by a change in the calculated optical basicity compared with that of the V3+/V4+ in both sodium and calcium silicate series. Alumina saturation from the crucible did not affect the calculated optical basicity of the sodium silicate glasses, although there was a change in the corresponding redox ratios. The results are compared using different experimental parameters and are useful in glass production (including those for biomedical applications) and extractive metallurgy of vanadium.