What are the ways to extend the life of the intermediate frequency furnace lining?

Extending the service life of the intermediate frequency furnace lining is very important to the safe and economical operation of the intermediate frequency furnace. The editor will introduce the methods of extending the service life of the intermediate frequency furnace lining from the aspects of charge, furnace construction, oven, application, testing, repair and so on.

1. Select the corresponding intermediate frequency furnace lining material according to the pouring temperature and properties of the molten iron.

2. The furnace lining should be rammed to a density of more than 2.3g\/cm3. It is strictly forbidden to smoke and carry sundries into the operation site when building the furnace.

3. Before building the furnace, the coil coating and the upper pouring block should be dried first, and it should be checked whether the leakage current of the coil is below the allowed range.

4. Check the correctness of the size of the crucible steel mold, whether there is an acute angle in the conical part, and if necessary, it should be ground as a whole. Whether the positioning of the mold in the furnace is correct.

5. In principle, baking and sintering should be started immediately after the furnace is built, and should not be placed for a long time.

6. The furnace lining has not been sintered yet, and when the molten iron is still melting, try to prevent unnecessary tilting of the furnace body to prevent damage to the furnace lining. The sintered furnace should be operated continuously so that the sintered layer of the furnace lining can be formed with sufficient thickness and mechanical strength.

7. Try to remove the slag in time, especially if it is overheated at high temperature (always before raising the temperature of molten iron to the pouring temperature).

8. Maintain a high liquid level of the metal to be used, so that the erosion of the furnace shape is uniform, and the low temperature (1300-1350 degrees Celsius) heat preservation period before pouring can shorten the time when the furnace lining is in a high temperature state.

9. The furnace should be operated continuously for 3 shifts as much as possible to prevent the lining from being constantly subjected to thermal shock. The 3-shift operation standard is one, and the 2-shift operation standard increases the lining life by 0-25 percent.

10. When the furnace is stopped, cover the furnace cover, reduce the amount of cooling water, and let the furnace lining cool slowly to prevent excessive thermal shock to the furnace lining.

11. When the amount of molten iron in the furnace is small, high-power operation should be avoided.

12. The molten iron for the new furnace lining should be less frequent and charged, and 1-2 packs of molten iron should be poured out first and then melted, and then the amount of molten iron should be gradually added. Only for one class.