原位合成多孔凝渣材料机理研究

Study on Mechanism of Synthesizing Porous Slag In-situ

含钛高炉渣特殊的物理化学性质是产生多孔凝渣层的基础条件,在降温过程中黏度提高很快,气泡被迅速“冷冻”;高熔点TiC、TiN及其固熔体Ti(C,N)的存在,显著降低了熔渣的表面张力,使炉渣黏度增加、变稠,阻碍渣中气泡的长大和放出;含钛高炉渣中TiO2组分,尤其是以四配位离子团存在的阳离子Ti4+,其增加熔体黏度、稳定泡沫的作用明显;TiO2及其高熔点还原产物是表面活性物质,具有稳定气泡的马拉戈尼效应。多孔凝渣层的形成是由于反应物质产生气体,气体上浮逸出的速度小于气体生成的速度,以及渣急速冷却凝固,使部分气泡“冷冻”存留在凝渣中。

The special property of Ti-bearing slag is the foundation to synthesize the porous slag ： The viscosity of the Ti-bearing slag increased quickly when temperature of melts dropped to froze the foam; The TiC,TiN and Ti（C,N） can lower surface tension in Ti-bearing slag to increase it＇s viscosity and restrain the foam growing up because they had a high melting point; The TiO2 in Ti-bearing slag played a important role to stabilize the foam; The TiO2 and it＇s reducing productivity such as TiC,TiN and Ti（C, N） were activity materials to preserve foam for the Marangani effect. The porous slag is as a result of reactant to generate gas, and the speed of the foam to float was less than the speed to generate gas, and same time the Ti-bearing slag solidified quickly to froze the foam in slag.