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采用拉筒法测定了在905~1055℃温度范围内Na3Al F6-Al F3(12%)-Li F(5%)-Mg F2(5%)-Al2O3-Sm2O3熔盐体系的表面张力,研究了温度、Al2O3、Sm2O3添加量对熔盐表面张力的影响,并用最小二乘法建立了熔盐表面张力与温度、Al2O3与Sm2O3添加量之间的回归数学模型,确定了熔盐电解制备Al-Sm中间合金较为适宜的电解条件。研究结果表明:熔盐体系表面张力与温度有良好的线性关系,并随着温度的升高而下降;Al2O3添加量的递增对熔盐体系表面张力产生线性减小的影响,而Sm2O3添加量的递增却对熔盐表面张力产生线性增加的影响;当ω(Al2O3):ω(Sm2O3)=9:1、7:3或1:1时,熔盐表面张力随混合氧化物添加量的增大而线性减小,当ω(Al2O3):ω(Sm2O3)=3:7时,熔盐表面张力却随混合氧化物添加量的增大而线性增加;表面张力回归方程为σ=0.21813-0.00146ω(Al2O3)+0.000553343ω(Sm2O3)-0.0000774912t。
The surface tension of the molten salt system of Na3Al F6-Al F3 (12%) - Li F (5%) - Mg F2 (5%) - Al2O3-Sm2O3 in the temperature range of 905 ~ The effects of temperature, Al2O3 and Sm2O3 dosage on the surface tension of molten salt were investigated. The mathematical model of the surface tension and temperature of molten salt and the addition of Al2O3 and Sm2O3 were established by the least square method. Alloy is more suitable electrolysis conditions. The results show that the surface tension of molten salt system has a good linear relationship with the temperature and decreases with the increase of the temperature. The increase of the amount of Al2O3 increases the linear decrease of the surface tension of the molten salt system. However, The surface tension of the molten salt increased with the increase of mixed oxides when the mass ratio of ω (Al2O3): ω (Sm2O3) = 9: 1, 7: 3 or 1: 1 But linearly decreases. When ω (Al2O3): ω (Sm2O3) = 3: 7, the surface tension of molten salt increases linearly with the increase of mixed oxides. The regression equation of surface tension is σ = 0.21813-0.00146ω (Al2O3) +0.000553343 (Sm2O3) -0.0000774912t.