Patent ID: 7691322

Claim:
A furnace, the furnace including a container for molten metal, the container having a periphery, the container providing a maximum depth for molten metal within the container, and further including a first conduit connected to the container by an entrance portion and a second conduit connected to the container by an exit portion, the first conduit providing an inlet to a flow generator, the second conduit providing an outlet from the flow generator, wherein: the furnace is a circular furnace, the container having a centre; the first conduit entrance is provided in the upper 60% of the maximum depth of the molten metal in the container and/or wherein the second conduit exit is provided in the lower 25% of the maximum depth of the molten metal in the container; and the first conduit entrance portion is angled relative to the adjoining part of the periphery of the container by an angle of less than 30°.