Treating molten pig iron in a torpedo
AssigneeAsea AB
InventorGoran Grimfjard
Life of this patent
Estimating the term…
Abstract
Pig iron is tapped from a blast furnace into a torpedo in which the iron has a treating agent introduced to it while the iron is electromagnetically stirred lengthwise in the torpedo to uniformly distribute the agent throughout the iron while reducing the tendency for skulling in the torpedo.
Claims7
A method for treating molten pig iron containing sulfur, in the torpedo of a torpedo car, the torpedo comprising a horizontal generally cylindrical body having tapered ends extending horizontally from both ends thereof and the body having a substantially central opening in its top and through which a lance is inserted into the iron and a desulfurizing agent is blown through the lance into the iron by compressed gas for reaction with the sulfur in the iron;
- wherein the improvement comprising providing the torpedo with at least one longitudinally extending magnetically permeable window and positioning at least one straight electromagnetic stirrer longitudinally on the outside of the window so as to project a traveling multi-phase AC field into the iron causing stirring of the iron longitudinally in the torpedo.
A torpedo car having a horizontal longitudinally extended torpedo adapted to contain pig iron for its treatment, the torpedo having at least one longitudinally extending wall portion which is non-magnetic and at least one electromagnetic stirrer positioned opposite to said portion so as to stir the pig iron when it is in the torpedo, the stirrer being a straight stirrer and positioned longitudinally with respect to the torpedo.
Dependencies are inferred from the claim text.