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为研究熔盐电解制取Al-Nd中间合金基础电解质AlF_3-(Na/Li)F-Al_2O_3-Nd_2O_3在一定组成及温度(1183 K~1263 K)范围内的主要物理化学性质变化规律,并间接地分析熔体结构信息及Nd_2O_3的溶解过程,分别采用阿基米德法、旋转法、连续变化电导池常数(CVCC)法测量熔盐体系的密度、粘度、电导率。结果表明,AlF_3-NaF-8%LiF-6%Al_2O_3(质量分数,下同)体系(NaF/AlF_3=2.2,摩尔比)在1183 K~1263 K范围密度随温度呈线性递减变化,而粘度随温度升高而降低,电导率随温度升高而升高,但呈非线性变化关系;在1223 K时,体系中Nd_2O_3质量分数达到2.5%左右时,密度、粘度、电导率分别达到极值;Nd_2O_3质量分数小于2.5%范围内,Nd_2O_3主要以化学溶解为主,并生成堆积密度大的Nd-O-F络合离子团;Nd_2O_3质量分数大于2.5%时,Nd_2O_3主要以物理溶解为主。
In order to study the main physical and chemical properties of AlF_3- (Na / Li) F-Al_2O_3-Nd_2O_3 in Al-Nd intermediate alloy at a certain composition and temperature (1183 K ~ 1263 K) Melt structure information and the dissolution process of Nd_2O_3 were analyzed. The density, viscosity and conductivity of the molten salt system were measured by Archimedes method, rotation method and continuous change of cell constant (CVCC) respectively. The results showed that the density of AlF_3-NaF-8% LiF-6% Al_2O_3 (NaF / AlF_3 = 2.2, molar ratio) varied linearly with temperature from 1183 K to 1263 K, When the mass fraction of Nd 2 O 3 in the system reaches 2.5%, the density, viscosity and conductivity reach the extreme values respectively. When the mass fraction of Nd 2 O 3 in the system reaches about 2.5%, the electrical conductivity increases with the increase of temperature, When Nd_2O_3 is less than 2.5%, Nd_2O_3 mainly dissolves mainly and Nd_2O complex ions with large bulk density are formed. When Nd_2O_3 is more than 2.5%, Nd_2O_3 is mainly dissolved by physics.