升温速率与预熔过程对含氟渣熔点影响分析  

Effect of heating rate and pre-melting process on melting point of fluorine-containing slag

作　　者：赵忠宇[1] 赵俊学[1] 谭泽馨 屈波樵 卢亮 崔雅茹[1] ZHAO Zhong-yu;ZHAO Jun-xue;TAN Ze-xin;QU Bo-qiao;LU Liang;CUI Ya-ru(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《钢铁》2020年第6期123-128,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(51674185,51674186)。

摘　　要：为探究升温速率以及预熔处理等条件对CaF2基渣系的熔点影响,揭示高温下含氟渣的挥发特性,采用半球点熔点检测与热重分析联合试验。结果表明,在熔点测定过程中,含氟渣的失重率为5%~17%,且随升温速率的减小而增大。预熔前后对无氟渣的熔点测定值几乎无影响,而对含氟渣,混合型与预熔型炉渣熔点差值近70℃,造成熔点差异的原因并非物相组成的改变,而是混合型渣样存在明显挥发,达到熔点时失重率为8.3%,而重熔渣失重率仅为2%。混合型渣样中存在大量的自由CaF2,且熔化初期比表面积较大,导致挥发率较大,而重熔型渣样中CaF2多以氟铝酸钙以及枪晶石等形式存在,结构致密,挥发受到抑制。这为探究挥发对含氟渣系的熔点等高温性能的影响提供理论基础。In order to explore the effect of heating rate and pre-melting on melting point and reveal the volatility characteristics of fluorine-containing slag at high temperature,a combined experiment of hemispherical melting point detection and thermogravimetry(TG)was taken.The melting point and volatilization characteristics of the fluorine-containing slag system were investigated under different heating rates and pre-melting processes.The results showed that the weight loss rate of fluorine-containing slag was 5%-17%during the melting point determination and it increased with the heating rate decreasing.There was almost no influence on the melting point of the fluorine-free slag before and after pre-melting,and for the fluorine-containing slag,the difference between the melting point of the mixed and the pre-melted slag was nearly 70℃.The reason for the difference was not the change of the phase composition,but the mixed slag had obvious volatilization.When is reached,the weight loss of the mixed slag was 8.3%at the melting point and that of the pre-melted slag was only 2%.There was a large amount of free CaF2 in the mixed slag sample,and for the pre-melted slag,CaF2 was mostly in the form of calcium fluoroaluminate and cuspidine.It provided a theoretical basis for exploring the effect of volatilization on high-temperature properties such as the melting point of fluorine-containing slag.

关 键 词：CAF2 含氟渣 熔点 挥发 模型 

分 类 号：TF111.17[冶金工程—冶金物理化学]