The effect of graphite addition on the performance of magnesia carbon brick

Generally speaking, the amount of graphite added in MgO-C bricks should be between 15% and 20%. When the amount of addition is high, the dissolution of MgO-C bricks tends to increase. This is because when the graphite content increases, the structure of the decarburized brick becomes coarser. As a result, the erosion of the slag per unit volume of the brick increases, causing the MgO to melt The amount of loss in the slag is accelerated; at the same time, as the amount of graphite increases, the amount of ash brought in also increases, thereby reducing the corrosion resistance of the brick. In addition, if the amount of graphite added is too much, it is difficult to form during production, and the product is easy to oxidize during use. In the carbon-bonded refractory material, if the carbon content is less than 10%, a continuous carbon network cannot be formed in the product, and the advantages of carbon cannot be effectively utilized; from the perspective of thermal shock stability, the amount of graphite added is less than 10%~ 15%, the thermal shock resistance of the brick is significantly reduced.