关键词: CaO-MgO-SiO₂-Al₂O₃精炼渣系, 正交回归, 黏度, 组分

Abstract: 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.