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The refractoriness of sintered magnesia
Date:2017-06-15 11:38 From:Zhengzhou Sunrise Refractory Author:admin
Magnesium brick refractoriness above 2000 ℃, magnesium bricks are containing more than 90% MgO, magnesite as the main mineral composition of refractories.
The main raw material of magnesia bricks is magnesite, its basic composition is MgCO3, EE is too high temperature calcination and then broken into a certain size to become sintered magnesite. Magnesite is widely used as filling furnace material, no negative pressure water supply equipment ramming material, (CaO) <2.5%, w (Si02) <3.5%), as the raw material for the production of magnesia brick.China's magnesium ore reserves and production rank the forefront of the world, magnesium bricks according to their different production process , Divided into sintered magnesia brick and chemical combination of magnesium bricks. Sintered magnesite is used after burning, the size of the appropriate proportion of magnesium sand, regenerative heating furnace plus brine (MgCI: aqueous solution) and sulfite pulp waste Liquid as a binder, press molding, in the 1550 ^ -1650 ℃ high temperature firing. And the chemical combination of magnesium bricks is not through the firing process. The sintered magnesite according to the proportion of grain with a good amount, adding the right amount of mineralizer and binder, press molding, after drying is finished. Chemical combination of magnesium brick strength is low. Performance is not as good as sintered magnesia, but the price is cheap, less than half the price of sintered magnesia. It is used in parts where the performance requirements are not so high, such as the furnace and the soaking furnace
Magnesium bricks are alkaline refractory materials, the alkali melt has a strong resistance, but can not resist the corrosion of acidic slag, the water table at 1600 ℃ high temperature, and silicon brick, drilling brick or even high alumina brick can contact reaction. The hardness of the magnesium bricks is above 2000 ℃, but the load softening point is only 1500-15500, and the softening to 40% deformation temperature is very small, only 30-501C. Magnesium brick thermal stability is also poor. An important reason for the damage of magnesium bricks.
In the heating furnace and soaking furnace. Magnesium bricks are mainly used to create the bottom of the furnace floor and the bottom of the furnace wall, it can resist the corrosion of iron oxide skin. Magnesia refractories are magnesium and aluminum bricks, magnesia chrome brick, magnesia brick, magnesium silicate brick and so on.
In order to improve the thermal stability of the magnesia and high temperature strength, in the ingredients added to the industry alumina powder can be made of magnesium spinel combined with magnesium and aluminum brick, large trolley furnace can be successfully used as high temperature roof material , As well as for the furnace with alkaline slag corrosion site.
Sintered magnesia in different amounts of chromite, can be made of magnesia-chrome brick, chrome magnesia brick. Heating furnace and soaking furnace is sometimes used to the masonry brick and brick or brick brick to prevent these bricks Working at high temperatures. 6.2.5 silicon carbide refractories silicon carbide (sic) is an artificial mineral. Raw materials for the silica and coke, 2000 ℃ above the high temperature electric furnace synthesis.
The main raw material of magnesia bricks is magnesite, its basic composition is MgCO3, EE is too high temperature calcination and then broken into a certain size to become sintered magnesite. Magnesite is widely used as filling furnace material, no negative pressure water supply equipment ramming material, (CaO) <2.5%, w (Si02) <3.5%), as the raw material for the production of magnesia brick.China's magnesium ore reserves and production rank the forefront of the world, magnesium bricks according to their different production process , Divided into sintered magnesia brick and chemical combination of magnesium bricks. Sintered magnesite is used after burning, the size of the appropriate proportion of magnesium sand, regenerative heating furnace plus brine (MgCI: aqueous solution) and sulfite pulp waste Liquid as a binder, press molding, in the 1550 ^ -1650 ℃ high temperature firing. And the chemical combination of magnesium bricks is not through the firing process. The sintered magnesite according to the proportion of grain with a good amount, adding the right amount of mineralizer and binder, press molding, after drying is finished. Chemical combination of magnesium brick strength is low. Performance is not as good as sintered magnesia, but the price is cheap, less than half the price of sintered magnesia. It is used in parts where the performance requirements are not so high, such as the furnace and the soaking furnace
Magnesium bricks are alkaline refractory materials, the alkali melt has a strong resistance, but can not resist the corrosion of acidic slag, the water table at 1600 ℃ high temperature, and silicon brick, drilling brick or even high alumina brick can contact reaction. The hardness of the magnesium bricks is above 2000 ℃, but the load softening point is only 1500-15500, and the softening to 40% deformation temperature is very small, only 30-501C. Magnesium brick thermal stability is also poor. An important reason for the damage of magnesium bricks.
In the heating furnace and soaking furnace. Magnesium bricks are mainly used to create the bottom of the furnace floor and the bottom of the furnace wall, it can resist the corrosion of iron oxide skin. Magnesia refractories are magnesium and aluminum bricks, magnesia chrome brick, magnesia brick, magnesium silicate brick and so on.
In order to improve the thermal stability of the magnesia and high temperature strength, in the ingredients added to the industry alumina powder can be made of magnesium spinel combined with magnesium and aluminum brick, large trolley furnace can be successfully used as high temperature roof material , As well as for the furnace with alkaline slag corrosion site.
Sintered magnesia in different amounts of chromite, can be made of magnesia-chrome brick, chrome magnesia brick. Heating furnace and soaking furnace is sometimes used to the masonry brick and brick or brick brick to prevent these bricks Working at high temperatures. 6.2.5 silicon carbide refractories silicon carbide (sic) is an artificial mineral. Raw materials for the silica and coke, 2000 ℃ above the high temperature electric furnace synthesis.
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