Spatial particle distribution during stokes sedimentation of alumina in high temperature concentrated suspension-electrolyte for aluminium production

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.17580/tsm.2018.02.05

Ключевые слова: Alumina, Aluminium, Cryolite melt, Low temperature electrolysis, Non-Newtonian fluids, Particle distribution, Sedimentation, Settlement, Stokes regime., Suspension

Аннотация: Our paper researches the behavior of high-temperature electrolyte suspensions in liquid metals production (in particular aluminium) and demonstrates new experimental data that explain some features of sedimentation in such systems. The experiments were carried out at 700 °C on the KF-AlF3-Al2O3 suspension system. The local concentration of particles is determined as a function of the vertical coordinate and time with different volume fraction of particles in the suspension (-). The transition of the first type of sedimentation to the third type for a system with the volume fraction= 0.24 was identified. An uncharacteristic type of sedimentation was observed when= 0.28. It is expressed in a gradual increase of with the vertical coordinate (z) without shocks, inherent for the transition from the settlement zone to the sediment. When= 0.32, the z-dependence indicates a hindered sedimentation, the value of is close to the maximum packing fraction (m), which corresponds to an infinitely large suspension viscosity. Dependence of the average particle size on z for systems with different compositions was investigated on micrographs of solidified samples. Sedimentation at low Reynolds numbers is significantly hindered in the part of the disperse system that is located near the wall that is bounding it. With a decrease of an average particle size and polydispersity,m decreased as well, which is accordance with literature data. It was established thatm strongly depends on the presence of a rigid wall. Based on the obtained results, we can assert that the decrease in the anode-cathode distance (ACD) is a very important direction in development of suspension electrolysis technology with vertical electrodes, and should be set in the 5

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Издание

Журнал: Tsvetnye Metally

Выпуск журнала: Is. 2

Номера страниц: 45-50

ISSN журнала: 03722929

Издатель: Ore and Metals" Publishing house"

Авторы

  • Yasinskiy A.S. (School of Non-ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Polyakov P.V. (School of Non-ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Yushkova O.V. (School of Non-ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, Russian Federation)
  • Sigov V.A. (School of Non-ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, Russian Federation)

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