Nozzle structure at bottom of refining furnace and nozzle filling method

Abstract

The invention relates to a nozzle structure at the bottom of a refining furnace and a nozzle filling method. The nozzle structure at the bottom of the refining furnace comprises a seating brick, a nozzle brick, refractory lining, a refining furnace base, a plug, a rotatable bracket and a supporting frame, and is characterized in that: the nozzle brick is manufactured by adopting aluminum-carbon refractory material taking resin as bonding agent, and the chamfer angle of the upper mouth of an inner cavity of the nozzle brick is R58mm. The nozzle filling method comprises the following steps: in the situation that the lower mouth of the inner cavity of the nozzle brick is plugged and locked by the plug, cast-iron scrap is filled in the inner cavity of the nozzle brick to the height of 80-120mm and tamped, and then flow guiding sand is filled at the upper layer of the cast-iron scrap to the upper edge of the inner cavity of the nozzle brick and tamped so as to complete the plugging and filling of the nozzle, wherein the flow guiding sand adopts zirconium flow guiding sand. The invention has the advantages that: the aluminum-carbon refractory nozzle brick taking resin as bonding agent can meet the requirement of multi-box casting of the refining furnace, simultaneously the radian at the upper end of the inner cavity of the nozzle brick is changed from R90 to R58, the nozzle is tightly closed in the casting process, and the use of the zirconium flow guiding sand and the improvement of the filling method realize that multi-box casting molten steel of the refining furnace can automatically flow out along with the falling of the flow guiding sand, thus achieving the purpose of automatic casting.

Description

Technical field: [0001] The invention relates to a nozzle structure at the bottom of a refining furnace and a nozzle filling method, belonging to the technical field of steel smelting and pouring. Background technique: [0002] Chinese patent CN1206062C discloses a multi-box pouring system for hot-fill plug rods in refining furnaces. After matching, the molten steel multi-box pouring system is completed. The disadvantages of the structure of the sealing nozzle at the bottom of the refining furnace in this patent are: at present, high-alumina casting nozzle bricks are used, and the shape of the inner cavity (nozzle) is a straight-through shape of a horn, and the upper nozzle ( The upper nozzle) chamfer is R90. With the extension of refining time and pouring time, the upper part of the high-aluminum nozzle and the contact part of the plug will be continuously corroded, resulting in poor fit between the nozzle and the plug, resulting in uncontrolled pouring of molten steel Co...

AI Technical Summary

Problems solved by technology

The disadvantages of the structure of the sealing nozzle at the bottom of the refining furnace in this patent are: at present, high-alumina cast nozzle bricks are used, and the shape of the inner cavity (nozzle) is a straight-through shape of a horn, and the upper nozzle ( The upper nozzle) chamfer is R90. With the extension of refining time and pouring time, the upper part of the high-aluminum nozzle and the contact part of the plug will be continuously corroded, resulting in poor fit between the nozzle and the plug, resulting in uncontrolled pouring of molten steel Happening

This increases the cost of materials

In addition, the cast iron cover plate is not closely matched with the water outlet, so in order to prevent it from moving, the water outlet needs to be filled with drainage sand around it, which causes waste of drainage sand

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