Process for minimizing foam formation during free falling of...

Details Process for minimizing foam formation during free falling of... Process for minimizing foam formation during free falling of...

B - Operations, Transporting

22

D

22/183

B22D 27/00 (2006.01) B22D 21/02 (2006.01)

Patent

CA 1160017

ABSTRACT A process for minimizing foam formation on the top surface of molten metal during free falling of molten metal, such as molten zinc, into moulds, launders or other containers is disclosed. The process comprises the step of maintaining the molten metal during the free falling thereof under an essentially non-oxidizing atmosphere, so as to prevent entrainment of sufficient oxygen into the molten metal by the falling stream to form excessive quantities of bubbles having a tenacious oxidized film and which do not collapse when they float to the surface of the molten metal but rather produce undesirable foam on the surface of molten metal.

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