Effect of the content of the alpha-phase and granulometric composition on the dissolution rate of alumina in cryolite-alumina melts

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.3103/S1067821209060078

Ключевые слова: alumina, cryolite-alumina melt, dissolution rates, alpha-phase, granulometric composition, agglomerates, recrystallization, gamma-Al(2)O(3) -> alpha-Al(2)O(3), ?-phase, ?-Al2O3 > ?-Al2O3, Agglomerates, Alumina, Cryolite-alumina melt, Dissolution rates, Granulometric composition, Recrystallization, Cryolite-alumina melt, Cryolite-alumina melts, Dissolution rates, Granulometric compositions, Recrystallizations, Agglomeration, Aluminum, Electrolytes, Halide minerals, Optical glass, Photography, Recrystallization (metallurgy), Dissolution, aluminum oxide, concentration (composition), cryolite, dissolution, granulometry, observational method

Аннотация: The rate and mechanism of dissolution alumina in a cryolite-alumina melt were determined starting from the results of a measurement of the dissolution rate, visual observations, and investigations of alumina agglomerates using an electron microscope. In the experiments, alumina samples delivered by different suppliers and differing in phase and granulometric compositions were dissolved. It is established that the dissolution rate of alumina decreases with the increase in the contents of alpha-Al(2)O(3) and -45-mu m fraction, as well as of the starting concentration of Al(2)O(3) in the electrolyte. The particles > 150 mu m in size and alumina, in which their amount reaches 31%, dissolved slower than alumina containing the -45-mu m fraction. Photographs of agglomerates forming after charging alumina and images of their microstructure are presented. The data on the dissolution rate are interpreted based on the behavior of the alumina charge in electrolyte, which is associated with recrystallization gamma-Al(2)O(3) -> alpha-Al(2)O(3) and with the formation of the network consisting of interlacing alpha-Al(2)O(3) plates.

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Издание

Журнал: RUSSIAN JOURNAL OF NON-FERROUS METALS

Выпуск журнала: Vol. 50, Is. 6

Номера страниц: 600-605

ISSN журнала: 10678212

Место издания: NEW YORK

Издатель: ALLERTON PRESS INC

Авторы

  • Isaeva L.A. (Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia)
  • Braslavskii A.B. (Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia)
  • Polyakov P.V. (Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia)

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