Sulfate Decomposition and Sodium Oxide Activity in Soda–Lime–Silica Glass Melts
Sulfate Decomposition and Sodium Oxide Activity in Soda–Lime–Silica Glass Melts
复制标题
钠钙硅玻璃熔体中的硫酸盐分解和氧化钠活性
DOI：
10.1111/j.1151-2916.2003.tb03578.x
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发表时间：
2003
影响因子：
3.9
通讯作者：
R. Beerkens
中科院分区：
文献类型：
--
作者：
R. Beerkens
已经确定了在钠钙硅玻璃熔体中释放氧气和硫氧化物气体的硫酸盐分解过程的反应平衡常数。还确定了二氧化硫在钠钙硅熔体中可能以亚硫酸根离子形式存在的化学溶解度。在1600 - 1800K的温度范围内，在1巴二氧化硫压力下，以亚硫酸盐形式溶解的二氧化硫的化学溶解度值在0.02 - 0.06 wt%（以SO₃²⁻计）之间。介绍了对商业浮法玻璃熔体和一种含74 wt%二氧化硅、16 wt%氧化钠和10 wt%氧化钙的钠钙硅模型熔体进行澄清处理后，方波伏安法研究的结果以及与温度相关的硫保留量的测量结果。所测量的硫保留数据和方波伏安法研究的结果被用于确定在1600 - 1800K温度范围内硫酸盐分解反应的平衡常数。硫酸盐分解的热力学关系和性质被用于推导钠钙硅熔体中氧化钠的活度。这些玻璃熔体中氧化钠活度的文献值很少。在本研究中，通过一种基于测量硫酸盐分解平衡常数以及与几乎纯硫酸钠熔体平衡的玻璃熔体中残余硫酸盐浓度的方法确定了这些活度。
Reaction equilibrium constants for the sulfate decomposition process, which releases oxygen and sulfur oxide gas in soda–lime–silica glass melts, have been determined. The chemical solubility of SO2, probably in the form of sulfite ions in soda–lime–silica melts, has also been determined. The chemical solubility value of SO2, dissolving as sulfite, ranges between 0.02 and 0.06 wt% SO32− at 1 bar SO2 pressure in the temperature range of 1600–1800 K. Results of square-wave-voltammetry studies and measurements of the temperature-dependent sulfur retention after the fining process of commercial float glass melts and a model soda–lime–silica melt, with 74 wt% SiO2, 16 wt% Na2O, and 10 wt% CaO, are presented. The measured sulfur retention data and the results of the square-wave-voltammetry studies are used to determine the equilibrium constant of the sulfate decomposition reaction in the temperature range of 1600–1800 K. The thermodynamic relations and properties found for sulfate decomposition are used to derive activities of sodium oxide in soda–lime–silica melts. Literature values for sodium oxide activities in these glass melts are rare. In this study, these activities have been determined by a method, based on the measurement of sulfate decomposition equilibrium constants and the residual sulfate concentrations in glass melts, equilibrated with almost pure sodium sulfate galls.