Method for casting lining of air-supply apparatus of blast furnace by using lost foam

Abstract

The invention discloses a method for casting a lining of an air-supply apparatus of a blast furnace by using a lost foam. The method comprises the following steps: placing a vertical-section lost foam into an inner cavity of an elbow from the top of the elbow; inserting a peephole channel section of a horizontal-section lost foam into a horizontal channel in a turning section at the lower part ofthe vertical-section lost foam from the right lower end of the elbow through a hot blast channel section, and then straightly inserting the peephole channel section into a peephole channel of the elbow; locating after a coniform step on a sealing section of the horizontal-section lost foam leans against the outer wall of the right end of the elbow; casting refractory castable material prepared bymixing refractory aggregate, refractory powder, agglomerant and bauxite cement coagulation accelerator into the inner cavity of the elbow from the head part of the elbow; compacting and solidifying the refractory castable material with a vibration rod; burning the vertical-section lost foam and the horizontal-section lost foam with flame; and clearing residues to obtain the lining of the air-supply apparatus of the blast furnace. The lining of the air-supply apparatus of the blast furnace prepared by the method can improve the work efficiency of manufacture, reduce the hot blast resistance loss, prolong the service life of the air-supply device and improve the yield of the blast furnace, thereby having great generalization value.

Description

technical field [0001] The invention relates to a method for manufacturing the inner lining of a ventilation elbow of a metallurgical blast furnace. Background technique [0002] The blast furnace ventilation elbow is used to transport hot air into the blast furnace. Since the temperature of the hot air is usually between 900-1250°C, in order to avoid the redness and burnout of the metal shell or castings, a layer of certain thickness must be poured inside the blast furnace ventilation elbow. refractory material. At present, domestic metallurgical enterprises all use metal inner molds to form the hot air passages in the ventilation elbows and the observation channels required for peeping when pouring the lining of the ventilation elbows. [0003] The traditional methods used to cast or make the lining of ventilation elbows by metal mold method are: [0004] ① Fix the conical metal mold in the elbow with a certain fixing device. The metal mold is usually divided into a hori...

AI Technical Summary

Problems solved by technology

[0012] ②The mold loading process is quite complicated, because a certain gap must be maintained at the joint between the metal mold and the elbow to ensure that the metal mold is suitable for the same type of elbow device, and a series of accessories are needed to help fix and seal

[0013] ③ It is difficult to ensure the equal cross-sectional area of ​​the channel and the flatness and smoothness of the channel, especially when casting the lining of small and medium-sized blast furnace ventilation elbows with a relatively small cross-sectional area of ​​the casting channel

[0014] ④ It is difficult to demould, and it is easy to damage the refractory lining of the poured ventilation elbow

[0015] ⑤Using this metal inner mold to cast the lining of the blast furnace ventilation elbow has low work efficiency and cannot be mass-produced quickly

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