CaO-MgO-SiO2 -Al2O3四元精炼渣系黏度热模拟研究
学 号：201006010310
HEBEI UNITED UNIVERSITY
毕业论文
GRADUATE THESIS
学生姓名：
专业班级：
学 院：冶金与能源学院
指导教师：
2013年06月03日
摘 要
精炼过程中，精炼渣能够完成脱硫、脱氧、去气、去夹杂等任务，而在炉外精炼时，精炼渣的物化性能，尤其是精炼渣黏度对钢液的精炼效果起着决定性的作用。采用Factsage热力学软件，对CaO-MgO-SiO2-Al2O3四元精炼渣系黏度模拟进行了计算，确定了精炼渣黏度随随熔渣组分和温度的变化规律。
研究结果表明，随着温度的升高，精炼渣黏度不断降低；随着精炼渣碱度的增加，精炼渣的黏度呈现先降低后增加的事实，碱度为3.6时精炼渣的黏度最低；温度低于1540℃时，随着MgO含量增加，精炼渣黏度先降低后增加， MgO含量为4%时黏度达到最小值；温度高
于1540℃时，随着MgO含量增加，精炼渣黏度不断增加；随着Al2O3含量增加，精炼渣黏度快速降低。
本研究结果与1500℃时精炼渣黏度实测值的变化规律相吻合，在一定程度上说明FactSage热力学软件模拟熔渣黏度是可行的，同时也为精炼渣系物化性能研究奠定了基础。
关键词： 精炼渣； 黏度； 碱度； MgO； Al2O3
Abstract
During the refining process, refining slag can complete desulfurization, deoxygenation, removal of gas, removal of the inclusion and other tasks, while the refining, refining slag physical and chemical properties, especially the refining slag viscosity of the molten steel refining effect plays a decisive role. Using Factsage thermodynamic software, CaO-MgO-SiO2-Al2O3 quaternary refining slag viscosity simulations were calculated to determine the refining slag viscosity with variation with slag composition and temperature.
The results show that as the temperature rising, refining slag viscosity is continue to reduce; With the increase of refining slag basicity, the viscosity of slag refining to reduce the increased first and then turn to rise, and the alkalinity is 3.6 when refining slag viscosity reach to minimum; while temperature below 1540℃, with the increase of MgO content, refining slag viscosity reduce at first and then increases, the viscosity reaches to a minimum when MgO content of 4%; at temperatures above 1540℃, with the increase of MgO content, refining slag viscosity increasing; with increasing Al2O3 content, refining slag viscosity rapidly decreased.