Repairing method of molten iron chute for mixer furnace

Abstract

The invention relates to a method for repairing and bricking an iron charging chute of a blast furnace mixer, which comprises the following steps: 1. a chute mouth precast block is forged; the shape of the precast block is manufactured according to the shapes of a chute mouth and a chute body; 2. the bottom of the chute body is welded with a mushroom nail, is cast with a layer of a casting material as a permanent layer; 3. after finishing casting, the permanent layer and the precast block are kept stand for 12 to 24 hours and are roasted for 24 to 48 hours by small fire; 4. after the permanent layer on the bottom of the chute body is dried, the upper layer is subjected to one-layer bricking; and a brick joint is filled with fire clay; 5. the surface of the chute body towards iron is bricked; 6. the iron charging surface and the residual surface of the iron charging chute are bricked; and 7. impurities on the surface of the iron charging chute are cleaned; and the iron charging chute is kept stand for 12 to 15 hours, is fully solidified, is positioned under a roasting rack and is roasted for 24 to 48 hours and can be brought into production. The method has the advantages of adopting the casting of the permanent layer, increasing and improving the chute mouth precast block, increasing the service life of the iron charging chute, reducing labor intensity, shortening the repairingand bricking time, improving the working efficiency and reducing the cost.

Description

technical field [0001] The invention relates to a repairing method, in particular to a repairing method for a mixing iron chute used for molten iron entering a mixing furnace from a molten iron tank in the iron and steel metallurgy industry. Background technique [0002] The iron mixing chute of the mixing furnace is the only channel responsible for the molten iron entering the mixing furnace from the molten iron tank. The whole mixing tank is composed of the tank body and the notch. The tank body is in a trapezoidal shape, and the iron facing surface is higher than the other two , is the iron ladle tank, and the notch is a ditch where molten iron flows, made of cast iron and lined with refractory materials. [0003] At present, the main building of the trough for adding iron is brickwork. The repairing method is to build three layers of corundum bricks at the bottom of the tank, the first layer is built flat, the second and third layers are vertically built, and the brick ...

AI Technical Summary

Problems solved by technology

From the point of view of the use process of this kind of repairing method, it only takes about 5 days for one use, and the service period is short; the main erosion damage part in the use process is at the notch, because the thermal expansion coefficient of the micro-expansion castable at the notch is different from that of bricklaying , the cracks between the two are prone to iron drilling; moreover, the heated cracks between the bottom refractory material and the cast iron are larger, so the iron drilling in the entire notch is serious; moreover, the whole masonry time is long, and the whole refractory material must be fully repaired after use. Demolition and re-building not only bring waste of materials, but also increase the time for building

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