Lining method of dry ramming material for EAF bottom

 

Lining preparation

Clean up the permanent layer residue, dust, iron wire, plastic cloth and other foreign objects. Calculate the knot size, the actual knot thickness is equal to the required knot thickness multiplied by 1.09, and a sufficient amount of ramming material should be prepared according to the construction furnace slope and furnace bottom size requirements. After receiving the material, check whether the ramming material has debris and damp. The debris should be cleaned up. The damp material should not be used, and knotting equipment such as rammers, pneumatic picks, etc should be prepared.

Lining method

After shoveling the material flat with a shovel, step on it with your foot to remove the air, insert the steel drill into the material and shake it repeatedly, and then use your foot to further solidify. The construction thickness of each layer of the ramming material is 150~200mm. Appropriate, and then use a knotting implement to repeatedly beat it 3 times in a spiral shape from the periphery to the center.

The method to check the quality of knotting is usually to put a round steel with a diameter of 5mm on the ramming layer and press it down with a pressure of 10kg, and its depth does not exceed 30mm. Steel drills can be inserted forcefully during on-site construction, and the depth should not exceed 30mm.

The method of knotting the furnace slope is the same as that of the furnace bottom. First, use your feet firmly, and then use the knotting device to ramming. The maximum angle between the furnace slope and the furnace bottom does not exceed 40°. Prevent rolling or collapse due to the furnace slope is too large.

In places where steel tapping bricks, furnace doors and other places where molten steel is agitated and scoured severely, it should be beaten vigorously and the size should be appropriately thickened to extend the service life of the refractory materials in these damaged parts as much as possible.

After beating, cover the ramming material with 5~10mm thick thin steel plate to prevent the shape of the furnace bottom from being damaged or the waste steel penetrating the ramming material layer when loading the scrap steel, which will cause the hidden danger of steel leakage. If steel cannot be made in time, 100~200mm thick lime should be placed on the iron plate to prevent hydration of the ramming material.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source：Lining method of dry ramming material for EAF bottom
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