Patent ID: 6027685
Filing Date: 2000-02-22
Classification: C22B

Abstract:
A device for releasing gas into a molten metal stream, said device comprising:(a) a pump for generating a molten metal stream, said pump having a pump base; said pump base having a top surface, a pump chamber and a discharge in communication with said chamber, said stream passing through said discharge, said discharge having a top wall;(b) a gas-release device for introducing gas into said stream, said gas-release device having a first end connectable to a gas source and a second end that extends through the top wall of said pump chamber and into said discharge where it extends into the molten metal stream passing through the discharge; and(c) a flow-directing device positioned within said discharge along said top wall downstream of said second end of said gas-release device, said flow-directing device having a height H of at least half the distance D that said second end extends into said discharge;whereby molten metal is pumped through said discharge past said second end of said gas-release device creating a low-pressure zone behind the gas-release device and gas is introduced into said first end of said gas-release device, the gas being released through said second end and being dispersed in said molten metal stream where it is diverted around said flow-directing device the flow-directing device at least partially filling the low-pressure zone.