连铸浇注过程中耐火材料壁面常出现夹杂物聚集、结瘤的问题,不仅降低连铸生产效率和耐火材料寿命,还影响铸坯质量.研究钢液中Al2O3夹杂物在MgO壁面结瘤过程,建立Al2O3夹杂物和MgO壁面的化学反应吸附模型.模型分析结果表明,耐火材料壁面粗糙度为3μm,夹杂物与壁面接触时间为2×10-6 s,化学反应生成的MgAl2O4可以使半径小于42μm的夹杂物颗粒吸附在壁面上;半径为5μm的夹杂物颗粒受到的化学吸附力在5×10-6 s时间内由1.3×10-6增加到2.8×10-6 N;尺寸小于3μm的夹杂物颗粒非常容易结合在一起,引发结瘤问题.模型的分析结果与实际生产结果相吻合,具有较好的适用性.
Problems of inclusions aggregation and nodulation often occur on the refractory wall during continuous cast-ing,which not only reduce the production efficiency of continuous casting and the lifetime of refractory,but also affect the quality of casting billet. The aggregation and nodulation of Al2O3 inclusions on the MgO wall was analyzed and the chemical reaction adsorption model of Al2O3 inclusions and MgO wall surface was established. Model analysis results show that MgAl2O4 generated by chemical reactions can make inclusions with a radius of less than 42μm be adsorbed on the wall,when the roughness of refractory wall was 3μm and the contact time between inclusions and wall surface was 2 × 10-6 s. The chemical adsorption capacity for inclusions with a radius of 5 μm increased from 1.3 × 10-6 N to 2.8×10-6 N within 5×10-6 s. Inclusions that less than 3μm were very easy to be combined together causing nodula-tion. The analysis results of the model have good applicability because they are in a good agreement with the results of the actual production.
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