Method of priming filter for molten metal

Details Method of priming filter for molten metal Method of priming filter for molten metal

B - Operations, Transporting

22

D

B22D 43/00 (2006.01) B01D 35/02 (2006.01) B22D 21/04 (2006.01) B22D 27/00 (2006.01)

Patent

CA 2556860

A method is described for priming an in-line molten metal filtration unit having a porous ceramic or refractory filter mounted substantially horizontally in a filter box. This filter box has an inlet for molten metal and an outlet for molten metal, the outlet being a closeable outlet in an exit well connecting to the downstream side of the filter. The method of the invention comprises the steps of adding a molten metal to the filter box sufficient to entirely cover the upstream side of the filter with a depth of molten metal and temporarily sealing the outlet in the exit well. A steadily increasing vacuum is then applied to the closed exit well at a rate between 0.1 and 10 kPa per second by withdrawing a stream of air from the exit well by means of a fan or air venturi until molten metal begins to flow through the filter. At that point the vacuum is quickly released and the molten metal outlet is opened. Once the filter has been primed in this manner, flow of metal through the filter continues while requiring only a relatively low head of molten metal on the inlet side of the filter.

L'invention porte sur un procédé d'amorçage d'une unité en ligne de filtrage de métal en fusion comportant un filtre céramique ou réfractaire poreux monté quasi à l'horizontal dans un carter. Ledit carter présente une entrée de métal en fusion, et une sortie de métal en fusion donnant sur un puits de sortie obturable placé en aval du filtre. Ledit procédé comporte les étapes suivantes: remplir le carter du filtre d'une quantité de métal en fusion suffisante pour noyer entièrement le côté amont du filtre; fermer temporairement la sortie obturable du puits; augmenter régulièrement le vide appliqué au puits obturé à raison de 0,1 à 10 kPa par seconde en en extrayant l'air à l'aide d'un ventilateur ou d'un venturi jusqu'à ce que le métal en fusion s'écoule à travers le filtre; et relâchement rapide du vide et ouverture de la sortie du puits. Une fois le filtre ainsi amorcé, le flux de métal continue à d'écouler à travers le filtre en ne nécessitant qu'une hauteur de charge relativement restreinte au-dessus du filtre.

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