电渣重熔用渣料烘烤过程的失重现象

On the Slag Weight Loss During Roasting for Electroslag Remelting

在实验室条件下采用热重分析方法研究了电渣重熔用渣料在烘烤过程中的失重现象,分析了渣料中易水化成分含量与烘烤时间的关系,并重点研究了在渣料完全失重情况下,渣层厚度与烘烤时间、烘烤温度与烘烤时间之间的关系,并通过数值拟合方法建立了方程.结合固态热分解机理对实验过程进行了分析,烘烤初期热分解过程受晶核形成及长大控制,反应后期主要受扩散反应控制.实验结果将为现场渣料烘烤提供指导.

The slag weight loss during roasting for electroslag remelting was investigated in laboratory via thermogravimetry.The relationship between roasting temperature and the content of hydratable components in slag was studied,especially the relationship between slag bed thickness and roasting time and that between roasting temperature and time under zero-gravity conditions,with several equations given by numerical fitting.The experimental results were analyzed through solid-phase thermal decomposition mechanism and indicated that in the earlier stage the thermal decomposition is dominated by nucleation and growth of crystal nucleus,and in the later stage it mainly depends on the diffusion controlled reaction.Such results will provide the directions to the roasting process of slag.