Viscosity of Flux for Steel Refining

制作了一个外筒旋转粘度计的原型，并在室温下进行了测试。用粘度计测定了二元na_2o_3 - b_2o_3和三元B_2O_3-SiO_2-Na_2O体系在800 ~ 1100 C温度范围内的粘度。结果表明：(1)粘度计适用于粘度范围为10^<-2> ~ 10^2 Pa s，温度高达1600‰。(2)随着Na_2O浓度的增加，Na_2O- b_2o_3二元熔体的粘度等温线在10mol% Na_2O左右出现最小值，在20mol% Na_2O左右出现最大值。随着温度的升高，最小值和最大值逐渐减弱。(3)用BO_3和BO_4的平衡可以定量地解释二元na_2o_3 - b_2o_3熔体的粘度等温线形状。(4)给出了三元B_2O_3-SiO_2-Na_2O熔体和伪三元体系[BO_3]- na_2o -[SiO_2+BO_4]熔体的粘度等温线。

A prototype outer cylinder rotating viscometer was built, and tested at room temperature. The viscosity of binary Na_2O-B_2O_3 and ternary B_2O_3-SiO_2-Na_2O systems have been measured in the approximate temperature range 800ﾟ to 1100ﾟC by the viscometer. The following results are obtained :(1)The viscometer was suitable for the measurement of the viscosity range from 10^<-2> to 10^2 Pa s, and at a temperature up to 1600ﾟC.(2)Viscosity isotherms of binary Na_2O-B_2O_3 melts showed a minimum value at about 10mol% Na_2O followed by a maximum value at about 20mol% Na_2O as the Na_2O concentration was increased. With increasing temperature, the minimum and the maximum became less prominent.(3)The shape of the viscosity isotherms of binary Na_2O-B_2O_3 melts could be quantitatively explained by an equilibrium between BO_3 and BO_4(4)Iso-viscosity lines of ternary B_2O_3-SiO_2-Na_2O melts, and of pseudo-ternary system [BO_3]-Na_2O-[SiO_2+BO_4] were provided.