Process for periodically and pneumatically stirring a bath of molten metal
AssigneeInstitute de Recherches de la Siderurgie Francaise
InventorsPierre Vayssiere, Jean-Claude Grosjean
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Abstract
A process for periodically and pneumatically stirring a bath of molten metal, wherein during the periods in which no stirring effect is required a fluid in gaseous state is injected through injection devices below the surface of the bath of molten metal in an amount sufficient to prevent blockage of the devices, whereas during the periods in which a stirring effect is required a fluid in liquid state which will vaporize quickly upon contact with the liquid metal is injected to provide an optimum amount of mixing gas with a minimum of injection devices. The process is advantageously used in converters for pneumatically converting pig iron into steel and in which oxygen is blown from above onto the bath of molten metal.
Claims13
In a metallurgical process in which a bath of molten metal has to be periodically stirred by introducing an inert gas through injection means below the surface of the bath, the steps of feeding, during a period in which no stirring of the bath by introducing an inert gas through injection means below the surface of the bath is carried out, a fluid in gaseous state through said injection means into the bath to prevent blocking of the injections means by the metal;
- and feeding, at the end of the period at which a fluid in gaseous is introduced through said injection means, a fluid in liquid state which will vaporize upon contact with the molten metal through said injection means into the bath to stirr the latter.
Dependencies are inferred from the claim text.