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Effective Measures to Extend the Lifespan of Lining in Medium-Frequency Furnaces
Oct 21,2020
1) Select the appropriate lining material based on the pouring temperature and the properties of the molten iron.
2) The lining shall be compacted to a density greater than 2.3 g/cm³. During furnace construction, smoking and bringing any debris into the construction site are strictly prohibited.
3) Before building the furnace, first dry the coil coating and the top pouring block, and check whether the coil leakage is within the allowable range.
4) Check the accuracy of the crucible steel mold dimensions and ensure that the conical section has no sharp corners; if necessary, sand the entire mold uniformly. Verify that the mold is properly positioned within the furnace.
5) In principle, baking and sintering should begin immediately after furnace construction; prolonged delays are not advisable.
6) While the furnace lining has not yet fully sintered and the molten iron is still being melted, avoid unnecessary tilting of the furnace body as much as possible to prevent damage to the lining. It is best to operate the sintering furnace continuously, allowing the sintered layer of the lining to develop sufficient thickness and mechanical strength.
7) Remove slag as promptly as possible, especially under conditions of high-temperature overheating (before the molten iron reaches its pouring temperature).
8) Maintain a high level of usable metal to ensure uniform erosion of the furnace lining, keep the temperature low (1300–1350℃) before pouring, and reduce the duration of high-temperature exposure for the furnace lining.
9) The furnace should operate continuously in three shifts whenever possible to avoid frequent thermal shock to the furnace lining. Compared to the first- and second-shift operating systems, the third-shift operating system can extend the lining’s service life by 0 to 25%.
10) When shutting down the furnace, cover the furnace lid to reduce the cooling water flow, allowing the furnace lining to cool down gradually and avoiding excessive thermal shock to the lining.
11) When the amount of molten iron in the furnace is low, avoid operating at high power.
12) New furnace lining The charging amount should be small and gradual. First, add 1 to 2 scoops of molten iron for melting, then gradually increase the amount of iron added—never pour it all in at once. After the iron has melted, it’s best to let the molten iron soak the furnace lining for a shift.
13) As much as possible, remove impurities such as molding sand adhering to the surface of returned materials to reduce the proportion of severely corroded charge materials added (according to foreign data: when the proportion of severely corroded charge materials reaches 30%, the lining life will be reduced by 75%).
14) Reduce the pouring temperature as much as possible within the allowable range. For every 10℃ reduction in furnace temperature, the lining life can be extended by 10%.
15) Shorten the insulation time of the furnace lining at high temperatures.
16) When preheating the charge, the preheating temperature should be below 600℃; otherwise, it will shorten the service life of the furnace lining.
17) As much as possible, avoid adding permeation materials such as A1, Mn, Zn, and Mg, as they can significantly shorten the lifespan of the furnace lining.
18) Avoid overheating the ingredient scaffolding and charge appropriately.
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
Contact Information
Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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