At present, the price of magnesium-carbon bricks in domestic steel mills is generally adopted as the method of enclosing: After the enclosing of the enclosing bricks, the magnesium-carbon bricks are filled with castables at a distance of 150-200 mm from the upper surface of the enclosing bricks and the steel cladding, to assist welding Flange rings to protect the masonry bricks. However, the bagging material will fall off during use, which will affect the use of the ladle. Each time the steel magnesium carbon brick wholesale package is taken off-line for minor repairs or overhauls, it is necessary to repair the bagging. Affected the ladle operation, flange consumption is more, the use of castables increased. After experimental research, a prefabricated part of the cladding is designed. After installation, the utilization rate of the ladle cladding can be improved, the erosion of the rim can be reduced, and the repair work of the flange ring of the cladding shell can be saved, which saves costs.

       1 Fabrication and installation of prefabricated parts

       (1) Preparation before production: Fix the mold according to the designed drawing size (see Figure 1) and lubricate the mold to facilitate demolding.

       (2) Mixing: According to the provisions of the ingredients list, weigh all kinds of raw materials, pour the materials into the mixer, and add them according to the principle of granules first, fine powder, and finally additives; explosion-proof fibers should be spread evenly and not in a mass Into; dry mix for 2 ~ 3min, then wet mix for 12 ~ 15min, control the amount of water to be 4.2% ~ 4.6% (w).

       (3) Forming: Pour the mixed material into the mold about 1/3, turn on the vibrating rod, and slowly rotate along the mold core in the mold, while continuously feeding, when the material is full, vibrate with the vibrating rod. After finishing, use a trowel to carefully pat it flat until a water film is formed on the surface.

       (4) Film release: The semi-finished product should be cured in an environment of ≥15 ℃, and it can be demoulded after 1 day of curing in spring and autumn. Care should be taken when demolding to avoid damaging the outer edges and the core.

       (5) Drying: Qualified semi-finished products should be dried at 110 ℃ for 24h. The physical and chemical indexes of the package prefabricated parts are shown in Table 1. Install in a steel plant according to the construction requirements of the plan. Pay attention to details during the installation process. Before starting the repair of the full repair kit, first assemble the steel cladding flange ring according to the requirements. The flange surface must be flat. Need to pay attention to installation and construction. After the prefabrication is installed, the ladle is built according to the masonry procedure.Finally, the pouring material is poured between the prefabrication and the ladle brick to make the prefabrication and the cladding brick firmly bonded, and then baked and put into normal use. The prefabricated part is very stable, and the prefabricated part and the cladding brick are tightly combined.

       2 use effect

       After 68 stoves, it went offline. It can be seen from the offline package that the prefabricated parts have less erosion and no flaking, and the package brick is well protected, and the package brick is not loosened; while the package area filled with castable during the same period is easy to fall off during use. It needs to be repaired at any time. The second ladle is used for the ladle, and the prefabricated ladle is used. After dismantling the ladle magnesium carbon brick, the brick is directly built. There is no need to repair the flange and the prefabricated part, and it can be put into use directly after baking. After the completion of the ladle, it is necessary to re-weld the cap and re-cast the cap to be put into use.

       For the use of the packaged prefabricated parts, a total of 3 furnaces were used, and a total of 210 furnaces were made. The oxidation depth of each furnace was about 60mm. The final thickness after removal was 1/2 of the designed thickness, which reached the design. Claim. It can be seen that the use of prefabricated parts has improved the utilization rate of the ladle envelope. It has been increased from 1 for each furnace service pouring to 3 to 4 furnace installation and can be removed and replaced at any time during the process. This not only reduces the welding work of the flange ring, saves the material and labor costs of the steel plant, but also reduces the use of castables at the mouth, and effectively protects the bricks of the ladle, makes the ladle stable, and can meet the requirements of the steel plant. Good contracting benefits

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