Effect of Na2O additions on thermal conductivities of CaO–SiO2 slags
Effect of Na2O additions on thermal conductivities of CaO–SiO2 slags
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DOI：
10.1179/174328105x48179
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发表时间：
2005-12
影响因子：
2.1
通讯作者：
S. Ozawa;M. Susa
中科院分区：
文献类型：
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作者：
S. Ozawa;M. Susa
采用非稳态热线法测定了Na_2 O-CaO-SiO_2渣系在室温至1773 K的较宽温度范围内的导热系数，提出了该渣系导热系数的预测方程。使用的样品为xNa 2 O-yCaO-zSiO 2（x+y+z=100摩尔%），其中50·9不依赖于（%Na2O）/（%CaO）比率，只要SiO2浓度保持恒定即可。这一发现表明，在该系统中，在T L和NBO/T的热导率之间的关系也适用于T L以外的温度使用T/T L的温标。在此基础上，提出了该渣系液态和过冷液态导热系数λ的预测方程：λ=a[1/（T/TL）]+B，其中a和B是由SiO_2浓度确定的常数。例如，对于含70 mol-%SiO2的炉渣，该方程适用于0.9 <T/T L<1.3的温度范围，对于含40 mol-%SiO2的炉渣，该方程适用于0.9 <T/T L<1.1的温度范围。
Thermal conductivities of Na2O–CaO–SiO2 slags have been determined using the non-stationary hot wire method over a wide temperature range between room temperature and 1773 K, to propose a prediction equation for the thermal conductivities of this slag system. Samples used were xNa2O–yCaO–zSiO2 (x+y+z=100 mol-%), where 50·9 are not dependent upon the (%Na2O)/(%CaO) ratio as long as the SiO2 concentration is kept constant. This finding indicates that in this system the relationship between thermal conductivities at T L and NBO/T also applies at temperatures other than T L using the temperature scale of T/T L. On the basis of this relationship, the following prediction equation has been proposed for thermal conductivities λ of this slag system in liquid and supercooled liquid states: λ=a[1/(T/T L)]+b, where a and b are constants specified by the concentration of SiO2. This equation applies, for example, in the temperature range 0·9<T/T L<1·3 for slags containing 70 mol-%SiO2 and 0·9<T/T L<1·1 for slags containing 40 mol-%SiO2.