(1. 北京科技大学 冶金与生态工程学院，北京 100083； 2. 北京科技大学 钢铁协同创新中心，北京 100083； 3. 北京科技大学 钢铁冶金新技术国家重点实验室，北京 100083； 4. 赞比亚谦比希铜冶炼有限公司，基特韦 23558)
摘 要: 采用旋转柱体法研究在1175~1400 ℃温度区间内，K2O含量对CaO-Al2O3-MgO-FexO-SiO2系熔体黏度的影响，并结合XRD和SEM分析了熔渣冷却过程中各物相的析出行为。同时，采用FactSage软件计算了该体系析出相总量及析出温度，与实验结果进行对比和分析。结果表明：当熔渣中K2O含量低于1%(质量分数)时，由于碱性氧化物的网络破坏作用，熔渣黏度降低，但是随着K2O含量的继续增加，熔渣黏度呈现先升高后降低的趋势，黏度最大值出现在n(K2O)/n(Al2O3)＞1的区域。同时，熔渣的黏度随温度的下降而升高，且黏度随温度变化时会出现骤增的转折点，当到达“转折点”温度时，熔渣的黏度会迅速升高，这主要是由橄榄石相的析出造成。
关键字: K2O含量；黏度；FactSage软件；析出相
（1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; 3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China. 4. Chambishi Copper Smelter Limited, ZhangKitwe 23558, Zambia）
Abstract:The viscosities of CaO-Al2O3-MgO-FexO-SiO2 slags with different K2O contents were measured using the rotating cylinder method in the temperature range from 1175 ℃ to 1400 ℃. The quenched slag samples were also characterized by XRD and SEM to identify the precipitated phases during the cooling process. Meanwhile, the theoretical calculation on precipitated phases was carried out on the platform of Factsage with the Equilibrium Moduls. The results show that the viscosity decreased when K2O is less than 1% (mass fraction). With increasing K2O content, viscosity increases firstly and then decreases. The maximum value of viscosity occurs when the mole ratio of K2O and Al2O3 is larger than 1. During cooling, the viscosity increases, and at the critical temperature, the viscosity enlarges suddenly, which is caused by the precipitation of the fayalite.
Key words: K2O content; viscosity; FactSage software; precipitated phase
