MgO-CaO-C refractories

Posted by adela li on October 24th, 2016

The coexistence temperature of CaO and C is the highest, and CaO-containing carbon composite refractory should have better performance.
But it is not as MgO-C brick so widely used is the main reason, the reason is easy to hydration CaO, the production process more difficult to control. But CaO ladle slide gate has a unique chemical stability, and has the role of purification of liquid steel in the smelting of stainless steel, pure steel, and low-sulfur steel and other areas of the role of high-quality steel has been increasing attention.
In addition, with the blowing technology and operating conditions of the update, the shape and extent of damage to the refractory material changes, and the urgent need for better performance of refractory bricks to adapt to this technology and operating clay insulating bricks conditions of the update.
Such as smelting stainless steel and smelting the general steel is different from the low alkalinity (CaO / SiO2) slag in the presence of refractory materials exposed to high temperature and long operating environment. MgO-MgO-C bricks can be used under such conditions because the low-basicity slag can improve the solubility of MgO and easily penetrate into the periclase grain boundaries and promote the separation and dissolution of the crystal grains. , The CaO / SiO2 in the slag is low and the total iron content is small because of the high operating temperature. It is difficult to form a dense MgO layer in the vicinity of the working face, so the reaction of MgO and C is easy in the brick, resulting in the deterioration of the structure. Therefore, in the smelting of stainless steel, MgO-C brick damage can be considered by the slag at the same time caused by dissolution and dissolution of magnesia carbon brick and MgO caused by the oxidation of carbon generated by the combined effect of both the deterioration of the brick damage rate increased significantly .
The use of the MgO-CaO-C brick in place of the above-mentioned operating conditions and the MgO-C brick used in the blowing method has the following advantages:
CaO in the brick dissolved in the slag in the face to form a high melting point and high viscosity of the slag layer, with a slag protective layer of the function; CaO more stable than MgO coexist with C, so the reaction caused by the brick internal tissue degradation small.

Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.