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.