Top-bottom-combined blown converter-type refining vessel

Abstract

A top-bottom-combined blown converter-type refining vessel is characterized in that: in the shape of a throat as viewed in the direction of a furnace body central axis, the outline of the throat comprises an arc and a line segment, wherein the line segment is parallel to a trunnion axis and present on the opposite side to a tapping outlet across the trunnion axis; when a straight line connecting two intersection points at which a straight line obtained by projecting the trunnion axis at the throat overlaps the arc has a length D0 and the line segment has a length D1, the ratio D1 / D0 is not less than 0.2 and not more than 0.8; and when, in the shape of a cross section perpendicular to the trunnion axis and including the furnace body central axis, the tangent at an arbitrary point on a furnace inner surface on the opposite side to the tapping outlet across the furnace body central axis and the furnace body central axis form an angle theta, the angle theta has a maximum angle of less thanor equal to 70 degrees.

Description

technical field [0001] In particular, the present invention relates to a top-blown bottom-blown converter type refining vessel which performs well in the intermediate discharge of slag. Background technique [0002] Iron and steel refining is performed by forming slag on the upper layer of the molten iron stored in the refining furnace and moving impurities contained in the molten iron to the slag. The refining furnace has a furnace opening on the top of the furnace, and molten iron and slag raw materials are loaded from the furnace opening for refining. After the refining is finished, the refining furnace is tilted so that only the molten steel is tapped from the tapping hole, and then the refining furnace is tilted to the opposite side to discharge the molten slag from the furnace mouth. [0003] In recent years, in iron and steel refining using a converter, a method of performing dephosphorization refining and decarburization refining separately in the same converter has...

AI Technical Summary

Problems solved by technology

[0007] However, in the method described in Patent Document 1, there is a problem that it is technically not easy to construct the weir at the furnace mouth.

In addition, when the weir is constructed with a refractory material, it is necessary to maintain its life at the same level as the refractory material formed in the furnace of the converter, but since a large load is applied to the weir during intermediate slag discharge, A problem arises in durability

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