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Main Source Of Magnesia

Date:2016-02-18 10:21 From:Zhengzhou Sunrise Refractory Author:admin
Magnesite refractories are chemically basic materials, containing at least 85% magnesium oxide. These are made from naturally occurring magnesite (MgCO3) and Silica (SiO2). Good quality magnesite bricks usually results from a CaO-SiO2 ratio of less than 2 with a minimum ferrite concentration, particularly if the furnaces lined with the refractory operate in oxidizing and reducing conditions.

The physical properties of this class of brick are generally poor, and their great value is primarily in their resistance to basic slags. The slag resistance is very high particularly to lime and iron rich slags. These constitute the most important group of refractories for the basic steelmaking processes. In addition to metallurgical furnaces, basic brick are now being successfully used in glass tank checkers and in lime and cement kilns.

Raw Magnesite (MgCO3) is generally used in its calcined or dead burned forms. Caustic calcined magnesite is used in effluent treatment, blended fertilizers and as feed stock for the chemical industry. Dead burned magnesite is a raw material used widely by the refractory industry. More recently fused magnesia grain; magnesia sinter with larger crystallite size and very high purity magnesia sinter were introduced to further improve the corrosion resistance.

Fused magnesia brick is produced by melting refractory grade magnesia or other magnesia precursor in an electric arc furnace. The molten mass is then removed from the furnace, cooled, and broken up. The material than is used in manufacture of refractories.

fused magnesia brick

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