calcium Magnesia cement

Refractory magnesia brick, often referred to as magnesite brick or magnesia refractory brick, is a type of refractory material made primarily from magnesia (magnesium oxide, MgO) as the main component. Magnesia bricks are known for their high refractoriness and excellent resistance to high temperatures.

Magnesia carbon bricks are made of high melting point alkaline oxide magnesium oxide (melting point 2800°C) and high melting point carbon materials that are difficult to be wetted by slag as raw materials, and various non-oxide additives are added. Non-burning carbon composite refractory material combined with carbon binder. Magnesia carbon bricks are mainly used for the lining of converters, AC electric arc furnaces, DC electric arc furnaces, and the slag lines of ladles. As a composite refractory material, magnesia-carbon bricks effectively utilize the strong resistance to slag erosion of magnesia and the high thermal conductivity and low expansion of carbon, compensating for the biggest shortcoming of magnesia's poor spalling resistance.

Magnesia-chrome bricks are refractory products with magnesium oxide (MgO) and chromium trioxide (Cr2O3) as the main components, and periclase and spinel as the main mineral components. This type of brick has high refractory resistance, high high-temperature strength, strong resistance to alkaline slag erosion, excellent thermal stability, and certain adaptability to acidic slag. The main raw materials for manufacturing magnesia chrome bricks are sintered magnesia and chromite

Magnesia iron spinel brick is a new generation of alkaline refractory with more technical content. It is mainly used in the firing zone of large dry process cement kiln. The microstructural characteristics of magnesia-aluminum spinel are relatively complex, mainly a combination of magnesia microstructure and iron-aluminum spinel microstructure. The interface between magnesia and iron-aluminum spinel is formed by Mg2+, Al3+, Fe2+ ions. The mutual diffusion and close combination realize the direct combination of 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.