组分含量对CaO-MgO-SiO2 -Al2O3四元精炼渣系黏度的影响

采用三元二次正交设计方法,利用熔体物性综合测定仪对碱度(CaO/SiO₂)1.2～6.0,MgO 1.9%～10%,Al₂O₃ 6%～29.1%的CaO-MgO-SiO₂-Al₂O₃四元精炼渣系的黏度进行了测试和研究。实验结果表明.该四元渣1500℃的黏度为0.129～4.612 Pa·s,随碱度增加,该精炼渣系的黏度先略有下降后快速增加;随MgO含量增加,该渣系黏度呈现快速降低后略有上升的趋势;随Al₂O₃含量增加,该渣系黏度快速降低。综合来看,碱度为4～5、MgO 4.5%～5.5%、Al₂O₃ 24%～27%时,该精炼渣系黏度(≤1.0 Pa·s)较为适宜,具有较好的流动性,促进渣-金之间的反应,提高吸附夹杂物的能力,并为脱硫创造有利的动力学条件。

Effect of Ingredient on Viscosity of CaO-MgO-SiO2-Al2O3 Quaternary Refining Slag Series

Using temary-quadratic orthogonal design method the viscosities of CaO-MgO-SiO₂ -Al₂O₃ quaternary refining slag series with basicity (CaO/SiO₂) 1.2-6.0, MgO 1.9%-6.0% and Al₂O₃ 6%-29.1% are measured and studied by using comprehensive meter for melt properties. Test results show that the viscosities of quaternary slag series at 1500 ℃ are 0.129-4.612 Pa·s； with increasing basicity the viscosity of refining slag series decreases slightly at beginning then increases quickly ； with increasing MgO content the viscosity of slag series decreases remarkably at first then increases slightly and with increasing Al₂O₃ content the viscosity of slag series decreases rapidly. It is obtained by synthetical study that the refining slag series with basicity 4-5, MgO 4.5%-5.5% and Al₂O₃ 24%-27% have suitable viscosity (≤ 1.0 Pa·s) which have better fluidity to promote slag-metal reaction, increase ability of absorption of inclusions and create a favorable condition for desulphurization.