The standard name of magnesia manufacturers is sintered magnesia. GB/T 2273-1998 combines the two national standards of "magnesia" "high-quality magnesia" into one standard "sintered magnesia".
Sintered magnesia is calcined at high temperature magnesite, brucite magnesium hydroxide extracted seawater. Strong resistance to hydration. When magnesite is calcined at 700-950 ℃, CO2 is released. The resulting magnesite is a soft porous material cannot be used as a refractory material; magnesite calcined at 1550-1600 ℃ is called burnt magnesia. Magnesia. Magnesium calcium synthetic sand
Burnt magnesia fired with natural magnesite as raw material is called sintered magnesia by one-step calcination two-step calcination process with high temperature equipment such as shaft kiln rotary kiln; See the national standard GB/T 2273-1998 for details. The magnesite formed by smelting magnesite as raw materials to a molten state cooling in an electric arc furnace is called fused magnesia; the magnesia made by extracting magnesia seawater is called seawater magnesia. Magnesia is one of the important raw materials for refractory materials, used to make various magnesia bricks, magnesia alumina bricks, ramming materials, repairing materials. Containing more impurities, it is used for paving the bottom of steelmaking furnace.
High-purity magnesia is made by flotation purification of natural super magnesite ore, which is lightly burned, finely ground, pressed ball, calcined in a warm oil shaft kiln. It is a high-quality raw material for making bricks indeterminate refractories. Mid-grade magnesia is made of light-burned magnesia with 97% MgO content as raw material, is produced by pressing ball, high temperature shaft kiln calcination other processes. With good sintering degree dense crystals, it is a high-quality raw material for the production of mid-range magnesia refractory products.
Fused magnesia is made by fusing selected special natural magnesite high-purity light burned magnesia particles in an electric arc furnace. It has large crystal grains, compact structure, slag resistant material good thermal shock stability. It is an excellent high-temperature electrical material an important raw material for making high-grade magnesia bricks, magnesia carbon bricks unshaped refractories.