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Construction method of dry ramming material for electric furnace bottom
Dec 05, 2018

Construction method of dry ramming material at the bottom of electric furnace?


Construction preparation


Clean up foreign matter such as permanent residue, dust, iron wire, and plastic cloth. Calculate the knot size, the actual knot thickness is equal to the required knot thickness multiplied by 1.09, and prepare a sufficient amount of ramming material according to the construction furnace slope and furnace bottom size requirements. Check the ramming material for any debris and moisture after the incoming material. The sundries should be cleaned up, the damp materials should not be used, and the knotting equipment such as the smashing machine and the wind smashing should be prepared.


Construction method


After shovel the shovel with iron shovel, use the foot to remove the air. After the steadiness, insert the steel into the material and shake it repeatedly. Then use the foot to further practise. The thickness of each layer of the ramming material is 150~200mm. It is advisable to beat it three times in a spiral from the periphery to the center with a knotting device.


The method of checking the quality of knotting is usually to place a round steel with a diameter of 5 mm on the ramming layer and press it under a pressure of 10 kg, the depth of which is not more than 30 mm. When the construction is on site, the steel can be inserted with force, and the depth should not exceed 30mm.


The method of knotting the slope is the same as that of the bottom of the furnace. First, use the foot to be solid, and then beaten with a knotting device. The maximum angle between the slope and the bottom of the furnace is not more than 40°. Prevent rolling or slumping due to too much slope of the furnace slope.


In the place where the steel taps such as the tapping bricks and the furnace door are agitated, it should be strongly beaten and appropriately thickened to extend the service life of the refractory materials in these damaged parts as much as possible.


After the completion of the fight, the 5~10mm thick steel plate is covered on the ramming material to prevent the shape of the bottom of the furnace from being damaged when the scrap is loaded or the scrap steel is inserted into the ramming layer, causing hidden troubles of steel leakage. If steel is not produced in time, 100~200mm thick lime is added to the iron plate to prevent hydration of the ramming material.


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