Pusher pump resistant to corrosion by molten aluminum and having an improved flow profile

A bubble pump having:

• a pump body comprising a vertical steel tube configured to allow for the transport of molten metal there through;
• said pump body having an interior formed from a non-wetting ceramic material cast on a carbon steel tube, the ceramic material being resistant to attack by molten metal;
• a nitrogen supply line attached to a lower portion of said pump body;
• said nitrogen supply line and said pump body communicating so as to allow the flow of nitrogen from said nitrogen supply line into the interior of said pump body;
• and a discharge head attached to the top of said pump body;
• said discharge head communicating with said pump body so as to allow for transport of molten metal and nitrogen from said pump body, into and then out of said discharge head;
• wherein said distribution chamber has an ellipsoidal dome shape with a generally flat bottom and an ellipsoidal top;
• wherein the ellipsoidal dome shape has a horizontal extent and a vertical extent, the horizontal extent being greater than the vertical extent, said discharge head further contains two discharge nozzles in communication with said distribution chamber to allow for the flow of molten metal and nitrogen from said distribution chamber through said discharge nozzles and out of said bubble pump.