What refractory material is used for the bottom of the electric furnace

 The bottom of the electric furnace and the bank slope together form a molten pool. The refractory materials directly bear high-temperature thermal load and erosion from molten slag. The erosion of molten steel, mechanical impact of scrap steel, and oxidation and reduction operations at high temperatures in the furnace make the molten slag penetrate into the furnace. Bottom, resulting in the thinning of the bottom of the furnace. The structure of the ultra-high-power electric furnace bottom is generally divided into three layers.

• 1. The insulation layer is the bottom layer of the furnace bottom. Its function is to reduce the heat loss of the electric furnace and to ensure that the temperature difference between the upper and lower sides of the molten pool is reduced. Generally, a layer of asbestos board is first laid on the furnace shell, and then diatomaceous earth powder. Lay insulation bricks on the flat surface.

• 2. The permanent layer is on top of the heat insulation layer, its function is to ensure the solidity of the molten pool, and play the role of supporting the bottom. Generally bricks are used, with about 3 layers of staggered joints, fired magnesia bricks containing Mg095%~96%, asphalt bonded magnesia bricks, magnesia dolomite bricks are used, and the brick joints are filled with magnesia or steel powder of the same material tightly compact.

• 3. The working layer is above the permanent layer. It is in direct contact with molten steel. It has high thermal load, severe chemical erosion, strong mechanical erosion, and is extremely easy to corrode. High-quality refractory materials should be used. The working layer of the bottom of the electric furnace in our country is combined with asphalt and built with magnesia carbon bricks. At present, ultra-high power electric furnaces generally use a mixture of 2CaOFe2O-rich magnesia and 2CaOFe2O-rich magnesia dolomite (without any binder). Ramming (actually the lower bunk) into a whole structure furnace bottom, its durability is high.

There are usually two types of ordinary power electric furnace bottoms:

① Knotted furnace bottom (or vibration compression furnace bottom). The working layer uses magnesia, and its bonding agent is tar and asphalt. When making the carbonless furnace lining, brine or water glass is used as the bonding agent.

② Brick furnace bottom. Generally, asphalt is used to combine magnesia brick, and carbon-free furnace lining is used to combine magnesia bricks with brine.

Article Source：What refractory material is used for the bottom of the electric furnace
Company name: Henan Changxing Refractory Materials Co.,Ltd
More refractory products:https://www.cxrefractories.com/en-product-solution
Email:info@cxrefractories.com
Website:https://www.cxrefractories.com