Overview: The standard name of magnesia is sintered magnesia. GB/T 2273-1998 combines the two national standards of "magnesium sand" and "high-quality magnesia" into one standard "sintered magnesia". 98 fused magnesia Sintered magnesia is calcined from magnesite, hydrous ore or magnesium hydroxide extracted from seawater at high temperature. Strong resistance to hydration. The magnesite is calcined at 700-950 °C to escape CO2. The obtained magnesia is a soft porous porous material and cannot be used for refractory materials. Magnesite is calcined at 1550-1600 °C, so-called burnt magnesia is called sintering. Magnesia. Using a high-temperature equipment such as a shaft kiln or a rotary kiln for one-time calcination or two-step calcination, the burnt magnesia sintered with natural magnesite as raw material is called sintered magnesia; the sintered magnesite is divided into 18 numbers according to its physical and chemical indicators. See national standard GB/T 2273-1998 for details. It is called fused magnesia which is formed by magnesite or the like as raw material after melting in an electric arc furnace to be cooled in a molten state; and is called seawater magnesia which is obtained by extracting magnesium oxide from seawater.

Magnesia is one of the most important raw materials for refractory materials, and is used to manufacture various kinds of magnesia bricks, magnesia-aluminum bricks, ramming materials, and charging materials. It contains more impurities and is used for paving steelmaking furnace bottoms. The high-purity magnesia is obtained by purifying and purifying the natural super magnesite ore by light burning, fine grinding, ball pressing and ultra-high temperature oil shaft kiln. It is a high-quality raw material for brick making and indefinite refractory materials. The mid-range magnesia is produced by calcining magnesia with a MgO content of 97% as a raw material, and is subjected to a process such as pressure ball and high temperature shaft kiln calcination. The sintering degree is good and the crystal is dense, which is a high-quality raw material for producing medium-grade magnesia refractory products. The fused magnesia is obtained by melting a selected special grade A natural magnesite or high purity light burnt magnesium granules in an electric arc furnace. The material has high purity, large crystal grains, compact structure and strong slag resistance, and has good thermal shock resistance. It is an excellent high-temperature electrical insulating material and is also important for making high-grade magnesia bricks, magnesia carbon bricks and amorphous refractories. raw material. Physical and chemical indicators: MgO% ≥ SiO2% ≤ CaO% ≤ Fe2O3% ≤ lgL% ≤ B·D ≥ (g / cm)

MS-98 977 05 12 05 03 330

MS-97a 975 06 12 07 03 330

MS-97b 97 07 14 08 03 325

MS-96 96 10 14 08 03 325

Open classification: chemical, metallurgical, refractory, magnesium oxide