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Magnesia carbon brick

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Magnesia carbon brick

Product attributes

  • Classification:Magnesia carbon brick
  • Product no. :1568107856
  • Number of visits:0
  • Date of issue:2019-10-14
  • Product overview
  • performance characteristics
  • Technical parameters


Magnesia carbon brick is a high melting point basic oxide magnesium oxide (melting point 2800 ° C) and a high melting point carbon material which is difficult to be infiltrated by slag as a raw material, and various non-oxide additives are added. A non-burning carbon composite refractory material formed by a combination of carbonaceous binders. Magnesia carbon brick is mainly used for the lining of converter, AC arc furnace, DC arc furnace, slag line of ladle and so on.


As a composite refractory material, magnesia carbon brick effectively utilizes the strong slag corrosion resistance of magnesia and the high thermal conductivity and low expansion of carbon, which compensates for the shortcomings of poor resistance to spalling of magnesia. Its main features are: good high temperature resistance, strong slag resistance, good thermal shock resistance and low temperature creep.


The refractory material used in the early ladle slag line is directly combined with magnesia chrome brick, fused and then combined with high-quality alkaline brick such as magnesia chrome brick. After the MgO-C brick was successfully used on the converter, the MgO-C brick was also used in the refining ladle slag line, and good results were obtained. At present, China and Japan generally use resin-bonded MgO-C bricks with a carbon content of 12% to 20%. In Europe, asphalt-bonded MgO-C bricks are used, and the carbon content is generally about 10%.


The MgO-C brick with a C content of 14-17% replaces the direct combination of magnesia chrome brick, and the life of the slag line portion is increased from 20 times to 30-32 times. The use of MgO-C bricks instead of magnesia-chrome bricks has improved the life of the slag line from 20-25 times to 40 times, which has achieved good results. The effect of antioxidant species on the oxidation resistance, slag resistance and high temperature flexural strength of MgO-C bricks. The study concluded that the mixture of fused magnesia and sintered magnesia, plus 15% phosphorus graphite and a small amount of magnesium alloy as antioxidants, has a good effect, with a capacity of 100 tons. The LF ladle slag line is used. Compared with the MgO-C brick with 18% C content without antioxidant, the damage rate is reduced by 20-30%, and the average erosion rate is 1.2-1.3mm/furnace [1].


Since the use of MgO-C bricks instead of magnesia-chrome bricks in China's refined ladle slag line bricks, the comprehensive use effect is obvious. The 300t ladle slag line has been using MT−14A magnesia carbon brick since July 1989, and the slag line life has been maintained at more than 100 times. The 150T electric furnace ladle slag line is made of low carbon magnesia carbon brick smelting cord steel, and the tapping temperature is 1600°C~1670. °C, achieved significant results.


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