Lance for injecting particulate material into liquid metal
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United States of America Patent
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Jul 8, 2008
Grant Date -
Oct 20, 2005
app pub date -
Apr 15, 2003
filing date -
Apr 24, 2002
priority date (Note) -
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Abstract
A metallurgical lance for injecting particulate material into a liquid comprises a main gas tube 6 defining an axial main gas passage terminating at its outlet and in a first Laval nozzle 38 downstream of the throat of said nozzle. A shrouding gas passage in the form of a combustion chamber 36 surrounds the main gas tube and terminates in a second Laval nozzle 42. A particulate material transport tube 4 defines a passage for the particulate material to be introduced into the first Laval nozzle 38 downstream of its throat. The first Laval nozzle 38 is provided with a passage 40 for the flow of coolant.
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