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Thermal Conductivity of 2CaO·SiO2 Bearing Solid Solution

机译：2CaO·SiO 2 固溶体的导热系数

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摘要

In the steel refining process, dissolution of quick-lime would accompany the formation of 2CaO·SiO_(2) on its surface. For proper understanding of heat supply to the lime phase from the molten slag through this 2CaO·SiO_(2) layer, thermal conductivity of this phase should be well known. The present study investigates the thermal conductivity of 2CaO·SiO_(2) bearing solid solution by hot-wire and hot-strip methods. Thermal conductivity of the solid solution was obtained to have the value from 0.28 to 1.18 W/m·K at temperatures from 298 to 1623 K and found much smaller than that of CaO. Its temperature dependence was positive as is often characterized for complex oxide system. Addition of FeO as solid solution component to 2CaO·SiO_(2) phase raised thermal conductivity and effect of change in concentration of P_(2)O_(5) was also elucidated to have a minimum peak of thermal conductivity appearing with this change. On the basis of the thermal conductivity of 2CaO·SiO_(2) obtained and that of CaO, thermal behavior of practical process has been evaluated. The complete thermal decomposition time of CaCO_(3) contained by 4 mass% in the sphere of quick lime having the radius of 1 cm is estimated to be about 30 s. The appropriate control of residual ratio of CaCO_(3) and size of quick-lime would be necessary for the promotion of lime dissolution into the steelmaking slag.
机译：在钢的精炼过程中，生石灰的溶解将伴随在其表面形成2CaO·SiO_（2）。为了正确理解从熔渣通过2CaO·SiO_（2）层向石灰相提供的热量，该相的热导率应该是众所周知的。本研究通过热线和热剥法研究了含2CaO·SiO_（2）固溶体的导热系数。固溶体的热导率在298至1623 K的温度下具有0.28至1.18 W / m·K的值，并且远小于CaO。它对温度的依赖性为正，这通常是复合氧化物体系的特征。将FeO作为固溶体组分添加到2CaO·SiO_（2）相中提高了热导率，并且还阐明了P_（2）O_（5）浓度变化的影响，使该变化出现了最小的热导率峰。根据所得的2CaO·SiO_（2）和CaO的热导率，对实际工艺的热行为进行了评估。在半径为1 cm的生石灰球中，CaCO_（3）的完全热分解时间为4质量％，估计约为30 s。适当控制CaCO_（3）的残留比和生石灰的大小对于促进石灰溶解到炼钢炉渣中是必要的。

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