Method and device for controlling the movement of a supply...

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 3/14 (2006.01) F15B 15/28 (2006.01)

Patent

CA 2379984

A method and a device for controlling the movement of a combined alumina feeding and crust breaking chisel in an aluminum production cell, wherein the chisel is moved downwards and upwards by means of a pneumatic cylinder which is alternatively fed with pressurized air, wherein electrical contact between the chisel and the melt is detected when the chisel reaches the melt, wherein it is monitored whether said electrical contact has been reached within a predetermined time interval, and if not, air at a second, high, pressure is fed to said first, and wherein air at high pressure is fed to the second side of the cylinder after said electrical contact has been established so as to quickly withdraw the chisel from the hot melt in order to minimize heat transfer from the melt to the cylinder.

L'invention concerne un procédé et un dispositif destinés à commander le déplacement d'un burin combiné d'approvisionnement d'alumine et de piquage de la croûte dans une cellule du production d'aluminium. Ce burin est déplacé de haut en bas au moyen d'un cylindre pneumatique qui est alternativement alimenté avec de l'air sous pression, le contact électrique entre le burin et la matière fondue étant détecté lorsque le burin a atteint la matière fondue, ce qui permet de déterminer si le contact électrique a été atteint dans un intervalle de temps déterminé, et si tel n'est pas le cas, de l'air, à une seconde pression, élevée, est alimenté au premier côté du cylindre, de sorte que l'air à pression élevée est fourni au second côté du cylindre, après établissement du contact électrique. Ainsi, le burin est-il retiré rapidement de la matière fondue afin de minimiser le transfert de chaleur entre la matière fondue et le cylindre.

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