НОВЫЕ ДАННЫЕ ПО СОСТАВУ ЭЛЕКТРОЛИТА В СУБСОЛИДУСНОЙ ОБЛАСТИ: ЧЕТВЕРНОЙ ФТОРИД LiNaCa2Al2F12 И ТВЕРДЫЕ РАСТВОРЫ ПРИ НАКОПЛЕНИИ ЛИТИЯ В ЭЛЕКТРОЛИТЕ : доклад, тезисы доклада

Описание

Перевод названия: NEW DATA ON THE ELECTROLYTE COMPOSITION THE IN THE SUBSOLIDUS REGION: QUATERNARY FLUORIDE LiNaCa2Al2F12 AND SOLID SOLUTIONS DURING THE ACCUMULATION OF LITHIUM IN THE ELECTROLYTE

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: XVI Международная конференция «Металлургия цветных, редких и благородных металлов» имени члена-корреспондента РАН Геннадия Леонидовича Пашкова; Красноярск; Красноярск

Год издания: 2023

Идентификатор DOI: 10.47813/sfu.mnfrpm.2023.164-179

Ключевые слова: electrolytes for aluminum production, Na3AlF6-K3AlF6-AlF3 system, LiF, K2NaAlF6, Na5Al3F14, solid solutions, x-ray powder diffraction

Аннотация: The quaternary fluoride phase LiNaCa2Al2F12 has been obtained by quenching in air a melt consisting of a stoichiometric mixture of the corresponding simple fluorides at a temperature of 850oC. Previously, the phase was observed as a small unknown phase in cooled samples of electrolyte of aluminum production. It has been established that the phase does not form regions of variable composition with the initial components. The crystal structure has been solved by X-ray powder diffraction technique: a=5.053(2) Â, c=17.546(7) Â, V=448.00 Â3, Z=2, S.G. P-421c. Lithium cations occupy a position with a tetrahedral fluorine environment. The short interatomic distance Li.F 1.89Â makes the position unavailable for other cations. The LiNaCa2Al2F12 phase is stable when heated to 600°C. Fragmentary decomposition takes place above 600°C in the solid state. There are the results on solid solutions studying in two local regions of the Na3AlF6-K3AlF6-AlF3 fluoride system with the addition of LiF. The substitution of lithium for potassium and sodium cations in elpasolite (K2NaAlF6) and chiolite (Na5Al3F14) has been studied. It has been established that in the structure of elpasolite, sodium is gradually replaced by lithium with the formation of K2LiAlF6. Potassium has not been substituted. Dissolution of LiF in cryolite (Na3AlF6) has not been detected. Chiolite has not formed solid solutions with LiF.

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Издание

Журнал: Металлургия цветных, редких и благородных металлов

Номера страниц: 164-179

Место издания: Красноярск

Издатель: Общественное учреждение "Красноярский краевой Дом науки и техники Российского союза научных и инженерных общественных объединений"

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