Combined Technique for Estimating the Physicochemical Properties of Zirconium-Containing Chloroaluminate Melts

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发表日期：

2024年4月1日

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A. A. Ivshina,
I. B. Polovov,
A. V. Abramov,
A. V. Chukin,
D. A. Danilov,
D. G. Lisienko,
O. V. Denisova,
O. I. Rebrin,
A. V. Panfilov,
A. V. Korobkov,
K. V. Skiba

摘要

Abstract—The magnesiothermic reduction of zirconium from its tetrachloride is a promising method for producing a nuclear-purity zirconium sponge. High-purity zirconium tetrachloride can be produced by extractive rectification. This method of zirconium and hafnium separation is based on the difference in the vapor pressures of zirconium and hafnium chlorides over a molten mixture of aluminum and potassium chlorides that is used as a liquid salt extractant. The separation of zirconium and hafnium tetrachlorides is carried out at controlled pressure in direct contact with a low-melting solvent, which is represented by a chloroaluminate melt. One of the main criteria for the suitability of molten potassium and aluminum chlorides for the separation of zirconium and hafnium is the molar ratio AlCl₃/KCl. A technique for determining the chemical and phase compositions of frozen chloroaluminate melts, including zirconium tetrachloride containing salts, is developed in this work using the results obtained with a set of modern methods and specific approaches.