中文摘要：

为使铬铁冶炼过程中的渣系具有良好流动性同时让渣金分离顺利进行,研究Al_2O_3和MgO对含铬渣黏度的影响具有重要的理论价值。应用拉曼光谱法从微观结构方面研究了Al_2O_3和MgO对CaO-SiO2-MgO-Al_2O_3-Cr_2O_3渣系黏度的影响。结果表明：在牛顿流体状态下,含铬渣的黏度随着渣中Cr_2O_3及Al_2O_3含量的增加而增大,随着MgO含量的增加而降低。结合拉曼光谱的分析结果,随着Al_2O_3含量的增加,高聚合度单元Q_（Si）~2和Q_（Si）~3的含量随之增大,而低聚合度单元Q_（Si）~1和Q0Si的含量随之降低,渣系中每个参与形成网络结构的硅原子所含非桥氧数量（NBO/Si）降低,因此熔渣聚合度增大。而随着MgO含量的增加,熔渣结构发生高聚合度单元Q_（Si）~3向低聚合度单元Q_（Si）~1和Q0Si的转变,NBO/Si值增大,渣系黏度变化与熔渣聚合度变化趋势保持一致。因此,通过分析渣系组元含量变化对渣系聚合度的影响可直观体现黏度变化趋势。

英文摘要：

In order to obtain the good liquidity of slag and optimize the slag-metal separation in ferrochrome process, the investigation of the effect of Al2O3 and MgO on the viscosity of Crcontaining slag has great theoretical value. From the viewpoint of microscopic structure, the effect of A12O3 and MgO on the viscosity has been investigated by Raman spectroscopy. Experimental results indicate that the viscosity of Cr-containing slag increases with the increasing Cr2O3and Al2O3content, whereas decreases with increasing MgO at the Newtonian flow region. Combined with Raman spectrum analysis results, the amounts of more polymerised units Q2Si and Q3Si increase with the increasing of Al2O3 content, and the less polymerised units Q1Si and Q0Si decreases, the number of non- bridging oxygens per Si atom （NBO/Si） participating in the formation of network structure decreases, while the degree of polymerization is greater. Along with the increase of the content of MgO, the more polymerised units Q3Si transform into the less polymerised Q1Si and Q0Si, the NBO/Si ratio increases, and the degree of polymerization gets lower, variation tendency of slag viscosity is consistent with polymerization degree, therefore, through the analysis of contents on the degree of polymerization can directly reflect the variation of viscosity.