Magnesia Mortar

Refractory clay refers to clay with a refractoriness greater than 1580°C and can be used as refractory materials and bauxite used as refractory materials. In addition to their high refractoriness, they can maintain volume stability under high temperature conditions, and have slag resistance, resistance to rapid cooling and rapid heating, and a certain mechanical strength, so they are extremely firm after calcination. Refractory clay is mainly used in the metallurgical industry as a raw material for the production of shaped refractory materials (bricks of various specifications) and unshaped refractory materials. The usage accounts for about 70% of all refractory materials.

Magnesia, also known as sintered magnesia, is produced by high-temperature calcination of magnesite, brucite or magnesium hydroxide obtained by the reaction of seawater and lime milk, and has strong hydration ability. It is mainly used to make alkaline refractory materials, such as magnesia bricks and magnesia-alumina bricks, which contain many impurities and are used to pave the bottom of steel furnaces for steelmaking. The main chemical component is MgO, and the mineral component is periclase equiaxed crystal system, with a density of 3.56~3.65g/cm, a Mohs hardness of 5.5, a melting point of 2800°C, and significant volatilization at 1800~2400°C. Pure periclase is colorless, and as the content of Fe2O3 and CaO increases, the color changes from light to dark, ranging from yellow to brown to dark brown. The grain size of periclase increases correspondingly with the increase of calcination temperature and the extension of holding time, and its resistance to hydration and slag erosion also increases accordingly.