Apparatus for treating molten metals

Claim 1

A LANCE FOR ADMITTING FLUIDS INTO STEEL FURNACES AND THE LIKE, SAID LANCE HAVING A FRONT END FACE AND COMPRISING A FIRST FLUID-CONVEYING CHANNEL HAVING A LARGE DISCHARGE OPENING IN SAID FRONT END FACE OF SAID LANCE OF A DIAMETER AT LEAST EQUAL TO THE DIAMETER OF SAID FIRST CHANNEL, A SECOND FLUID-CONVEYING CHANNEL SURROUNDING SAID FIRST FLUID-CONVEYING CHANNEL, AND AN ANNULAR TRANSVERSE GAP COMMUNICATING WITH SAID SECOND CHANNEL AND OPENING INTO SAID FIRST CHANNEL AND EXTENDING SUBSTANTIALLY NORMAL TO BOTH SAID CHANNELS AT A SHORT DISTANCE INWARDLY OF SAID LARGE DISCHARGE PENING OF SAID FIRST CHANNEL; AND SPINNING MEANS ARRANGED FOR SPINNING FLUID PASSING THROUGH SAID SECOND CHANNEL SO THAT SUCH FLUID IS IN CIRCULATORY MOLTEN WHEN IT ENTERS SAID FIRST CHANNEL THROUGH SAID ANNULAR TRANSVERSE GAP OF SAID LANCE IN A DIRECTION TRANSVERSE TO THE FLOW OF FLUID THROUGH SAID FIRST CHANNEL, SO THAT SAID FLUIDS ARE THOROUGHLY MIXED AND WILL ISSUE FROM SAID LARGE DISCHARGE OPENING IN DIVERGENT FLOW.