Magnesia, also known as sintered magnesia, is calcined at high temperature by magnesite, brucite or magnesium hydroxide prepared by the reaction of seawater and milk of lime, and has strong hydration ability.
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Refractory Magnesia Details
Magnesia is one of the most important raw materials for refractories. It can be pided into three categories: sintered, light-sintered, and fused magnesia. It is made of magnesite, brucite, or seawater and milk of lime to produce magnesium hydroxide, and then calcined at high temperature.
It is a magnesium oxide material, usually composed of magnesium oxide and other oxides, and is widely used for its high temperature stability and fire resistance. It comes in many different forms such as granules, powder, bricks and blocks.
Features and requirements
1) High purity, containing more than 98% MgO;
2) Low R2O3 content;
3) High particle volume density, reaching above 3.4g/cm;
4) High CaO/SiO2 ratio, greater than 2;
5) The periclase grain size is large, above 100-200 μm;
6) The periclase crystal phase forms a direct bond.
Dead Burnt Magnesite
Art No. | MgO(%) | SiO₂(%) | CaO(%) | Fe₂O₃(%) | Al₂O₃(%) | B.D≥g/cm³ |
98 | 98%MIN | 0.35%MAX | 0.9%MAX | 0.55%MAX | 0.05%MAX |
3.4 |
97.5 | 97.5%MIN | 0.55%MAX | 1.2%MAX | 0.6%MAX | 0.15%MAX | 3.3 |
97 | 97%MIN | 0.70%MAX | 1.4%MAX | 0.7%MAX | 0.20%MAX | 3.3 |
96.5 | 96.5%MIN | 0.80%MAX | 1.6%MAX | 0.8%MAX | 0.20%MAX | 2.8 |
Refractory magnesia has a wide range of applications, including use in the production of monolithic refractory products and in cement, steel and aluminum industries.
It is used in the lining of furnaces, kilns, boilers, and incinerators, as well as in the production of fire bricks and other refractory products.It is usually used to make magnesia bricks, magnesia-alumina bricks, ramming materials, repairing materials, etc., and those with more impurities are used to pave the bottom of steelmaking furnaces, etc.
It is also used as a thermal insulation material in cryogenic applications, and in the production of arc and resistance welding electrodes.
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