The Solution To Wet Knotting In Intermediate Frequency Induction Furnace

Furnace knotting is an important process in the smelting and casting of intermediate frequency induction furnaces. Over the years, the repetition of knotting the furnace and purchasing the integral furnace has been unsatisfactory. We adopt the wet knotting technology of the intermediate frequency induction electric furnace, which has been well improved.

1. Advantages

The wet knotting technology of the intermediate frequency induction furnace is a new technology for the knotting of the furnace that has appeared in recent years. After being introduced to our company in 2012, through serious preliminary demonstrations, we succeeded in one fell swoop, and solved the problem of high labor intensity, time-consuming, and difficult knotting quality that have been plagued by our furnace tying work. Moreover, this method of tying The knotted furnace is also easy to disassemble, and the service life is almost the same as that of dry knotting. The 1t furnace can ensure the safe melting of more than 60t molten metal every time.

2. Basic method

At the initial stage of application, we used silica sand as the base material for the furnace bladder knotting material. The basic ingredients are: silica sand: 2# (8～10 mesh) 5 %, 3# (10～26 mesh) 35%, 4# (16～24 mesh) 35%, 8# (250～400 mesh) 25%; Boric acid: 2.5%; water: 8%. After three-dry and three-wet rebuilding, the knot is gradually knotted to the furnace mouth by using a vibrating rod while feeding. After natural drying for 4-6h (depending on the temperature), pull out the steel mold, and then dry it naturally for no less than 2h (depending on the temperature, if possible, the natural drying time can be extended to 8-10h best). After finishing the furnace collar, put 6-8 steel pipes in the furnace against the furnace wall, and put a steel pipe (with base) in the middle, and then start the power oven. The specifications of the oven are the same as those of the dry-knotted furnace.

3. Compare

Compared with the dry-knotted furnace, the wet-knotted furnace has no layer seams that may exist in the dry-knotted furnace. The furnace charge added each time is filled evenly under the action of the vibrating rod, and the excess water continues to rise, ensuring that the combination of the newly added furnace charge and the first furnace charge does not stratify. Especially afterwards, we used a mixer to mix the furnace material, and completely eliminated the labor intensity problem of the furnace. Knotting the furnace is not only easy, but also the quality can be fully guaranteed. Now we use refractory aggregate (a kind of multi-specification furnace material preparation) produced by a professional factory to make it easier to tie the furnace bladder. The only shortcoming is that the physical strength is not as high as that of the dry-knotted furnace, but as long as the smelting operation is carried out according to its characteristics, its shortcomings are not a problem.

4. Technical points

Technical points to pay attention to when using wet knotting furnace:

• (1) The holding of the moisture of the stirring charge should be dry rather than wet, so as to avoid excessive moisture overflow during knotting.
• (2) The oven must be carried out separately, and the oven with materials cannot be carried out. For the first smelting, especially the initial charging of the charge, the charge should hit the bottom and the furnace wall as much as possible. At other times, avoid using the furnace wall as a support to move the charge.
• (3) When adding furnace charge, pay special attention to avoiding shed material to avoid the occurrence of material shifting operation.
• (4) When the furnace bladder partially falls off, brush it with water glass and plug it tightly with wet furnace material.

Concluding remarks

The practice of several years has proved that the wet-knotting furnace bladder technology is an easy, reliable and safe method for furnace bladder knotting, which can be used by enterprises with confidence.

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