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The Basic Refractories

Refractory materials of Magnesite brick series


1.Refractory materials of Magnesite brick series



        Magnesia brick is one of the important refractories in ferrous, nonferrous, and building material industries. re-burned magnesia is used as raw material for making common magnesia bricks, middle grade sintered magnesia for middle grade magnesia bricks, high temperature oil shaft kiln fired magnesia for calcinations of high-quality magnesite brick and fused magnesia for rebonded magnesite brick.


        The rebonded magnesite bricks produced in China uses high-quality fused magnesia as raw material, the highest grade of which contains MgO more than 98%, with large crystal granule and high chemical stability, which is specially applicable to harsh working conditions of high temperature and heavy erosion.



2.Periclase-spinel brick series




        Periclase-spinel brick is made of high purity sintered magnesia and (or) fused synthetic spinel clinker, molded at high shaping pressure and fired at high temperature. During the process of high temperature firing, secondary spinel can be formed, which is helpful in reinforcing the toughness and erosive resistance of the spinel bricks.


        Periclase-spinel bricks can be applied to large cement kiln, non-ferrous smelting and other industrial furnaces as per the different contents of spinel phase.



3.Refractory materials of magnesite chrome brick series




        With excellent high temperature properties, good erosion and permeability resistance, and better thermal shock resistance, magnesite chrome bricks have been widely used in the ferrous, non-ferrous, and building materials industries for lining of various high temperature industrial kilns and furnaces. Direct bonded magnesite chrome bricks, which are made of China-made high purity sintered magnesia (MgO≥97%, Bulk density≥3.25g/cm3), combined with high quality chrome ore and (or) high purity synthetic magnesia chromite clinker, molded at high shaping pressure and fired at high temperature, have excellent high-temperature properties, high direct bonding rate, strong erosion resistance and good thermal shock resistance.



4.Refractories of rebonded magnesia-chrome brick series




        semi-rebonded magnesia-chrome brick is made mainly of high purity magnesia clinker; chrome ore concentrate and fused synthetic magnesia-chrome clinker; rebonded magnesia-chrome brick mainly high purity fused magnesia chromite clinker, mixed with fused magnesia clinker. Semi-rebonded magnesia-chrome bricks and rebonded magnesia-chrome bricks are especially suitable for RH and non-ferrous furnaces because such bricks can substantially increase humidification penetration angle of high-temperature molten slag in refractory lining so that molten slag penetration into refractory lining is resisted, resulting in extremely high penetration resistance and high erosion resistance.  


5.Magnesia-calcia refractories




        Magnesia-calcia bricks are made of  high quality synthetic magnesia-calcia clinker in different MgO/CaO proportioning ratio depending on different requirements of different furnaces and kilns. To avoid hydration, the sintered magnesia-calcia bricks out of sintering shall be immediately soaked into bitumen or paraffine under vacuum and pressurized condition, and sealed into thermoplastic packages.


        The magnesia-calcia brick has excellent high temperature and slag resistance, which is specially applicable to refining devices such as AOD and VOD furnaces and burning zone of the large cement kilns.



6.Magnesia-zircon based refractories



        Magnesia-zircon bricks are made of high purity fused magnesia clinker and synthetic magnesia-zircon clinker, formed at high shaping pressure and fired at high temperature. Periclase is main crystal phase of the aggregate in such bricks, with the forsterite wrapped badeleyite structure formed after reaction-sintering in its base. The material is mainly applied to regenerator of glass kilns, and has strong anti-corrosion performance against the high temperature basic phase with long life of over 10 years.



7.Pleonaste brick  



        The Pleonaste brick is a kind of high quality basic refractories specifically used for burning zone of large cement kilns. It contains 7-9% of Fe2O3, very small amount of SiO2 and CaO, and small amount of Cr2O3.


        The Pleonaste brick, as specifically used in the burning zone of the large cement kilns, can quickly form firm coating to protect the bricks from corrosion of  high temperature and liquid phase metal and ensure safe and stable operation of the cement kiln, with longer service life, for example, 1200-day service life was achieved with a 4000t/d  capacity cement kiln, more than 4-6 times that of other types of refractory.



8. Forsterite brick




        Magnesia and natural forsterite ore are selected as raw material for making forsterite brick. Through adjusting the MgO/SiO2 ratio in its base material, forsterite crystal phase enriched structure is formed, the erosion resistance of which is better than that of magnesia bricks.

        Forsterite bricks are mainly used in the regenerator of the galss kiln, non-ferrous metallurgical furnaces, and the permanent lining of the steel industrial furnaces.