Behaviour of aluminium oxide in KF-AlF3-Al2O3 melts and suspensions

Описание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.ceramint.2020.01.180

Ключевые слова: Dissolution rate, Alumina, Mechanical activation, Low-temperature electrolyte, Aluminium production, Suspension, Molten salt

Аннотация: The article addresses the properties of melts and alumina suspensions based on the molten KF-AlF3-Al2O3 system, the kinetics of alumina dissolution and the rheological properties that determine the sedimentation stability. The study of such suspensions has become topical due to the prospects of their use as electrolytes in the prodПоказать полностьюuction of aluminium using carbon-free anodes. The effects of the temperature, the particle size and the phase composition of the dispersed material and its volume fraction in the suspension on the dissolution kinetics and the sedimentation velocity are studied. The experiments were carried out over the melts with cryolite ratios 1.3 and 1.5 in the range of 750-850 degrees C. Three different types of aluminium oxide were used. The Reynolds numbers for sedimentation have indicated the Stokesian regime. Typical alumina dissolution rates were in the range of 0.028-0.167 g kg(-1) s(-1), which is close to the values reported previously. Sedimentation velocities were in the range of (0.05-3.61).10(-2) m/s, which is several times higher than those obtained previously for phi = 0.24-0.32 at 700 degrees C. It is shown that mechanical activation of alumina increases the performance of the suspension in terms of the sedimentation stability and the dissolution rate increasing.

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Издание

Журнал: CERAMICS INTERNATIONAL

Выпуск журнала: Vol. 46, Is. 8

Номера страниц: 11539-11548

ISSN журнала: 02728842

Место издания: OXFORD

Издатель: ELSEVIER SCI LTD

Авторы

  • Yasinskiy Andrey S. (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Krasnoyarsk, Russia)
  • Suzdaltsev Andrey (Inst High Temp Electrochem UB RAS, Ekaterinburg, Russia)
  • Polyakov Peter (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Krasnoyarsk, Russia)
  • Padamata Sai Krishna (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Krasnoyarsk, Russia)
  • Yushkova Olga (Siberian Fed Univ, Sch Nonferrous Met & Mat Sci, Krasnoyarsk, Russia)

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