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The refractory materials of the ferroalloy ore furnace include three parts: the top refractory material, the furnace wall refractory material and the molten pool refractory material (furnace slope and furnace bottom). In the ferroalloy smelting process, different parts of the refractory materials are in different working states.
The top refractory material mainly bears the erosion impact of the high temperature furnace gas and the sprayed slag; the temperature change between the feeding batches and the radiant heat of the high temperature arc; the airflow impact and pressure change during the collapse of the material.
The furnace wall refractory material mainly bears the high temperature radiation effect of the arc and the temperature change during the feeding interval; the erosion impact of the high temperature furnace gas and the sprayed slag; the impact wear of the solid material and the semi-melt; the severe slag corrosion near the slag line Slag impact. In addition, when the furnace body is tilted, it is also subjected to additional pressure.
The refractory material of the furnace slope and the furnace bottom mainly bears the pressure of the upper furnace charge or molten iron; the temperature change during the intermittent feeding period, the impact of the charge of the charge and the arc melting loss; the erosion impact of the high temperature molten iron and the slag.
In order to ensure the normal operation of the submerged arc furnace, it is necessary to use a refractory material with high refractoriness and load softening temperature, good resistance to rapid cooling and slag resistance, and a large heat capacity and a certain thermal conductivity to build a submerged furnace lining.
The commonly used refractory materials for submerged arc furnaces are clay bricks, high alumina bricks, magnesia bricks, carbon bricks, silicon carbide bricks, and chrome-magnesia bricks.
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