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Magnesia carbon brick with high melting point of alkaline oxide, magnesium oxide (melting point 2800 ℃) and hard to slag invasion of high melting point carbon materials as raw materials, all kinds of oxide additives.Non - burning carbon composite refractory with carbon binder.Magnesia carbon brick is mainly used for lining of converter, ac arc furnace, dc arc furnace and slag line of ladle.Magnesia carbon brick, as a kind of composite refractory material, has effectively utilized the strong slag erosion resistance of magnesia, high thermal conductivity and low expansion of carbon, and compensated the biggest disadvantage of poor peeling resistance of magnesia.
Its main characteristics are: good high temperature resistance, slag resistance, good thermal shock resistance, low temperature creep.
Common binders used in the production of mgo-c bricks include coal tar, coal tar and petroleum tar, as well as special carbon resins, polyols, asphalt modified phenolic resins and synthetic resins.The following types of binders are currently used:
1) bituminous substances.Tar pitch is a kind of thermoplastic material, which has great affinity with graphite and magnesium oxide, high carbon residue rate after carbonization and low cost.However, tar pitch contains high content of carcinogenic aromatic hydrocarbons, especially benzoic acid.The use of tar pitch is now decreasing due to increased environmental awareness.
2) resins.Synthetic resin is made by reaction of phenol and formaldehyde. It can be well mixed with refractory particles at room temperature. After carbonization, carbon residue rate is high.However, the glass network structure formed after carbonization is not ideal for thermal shock resistance and oxidation resistance of refractories.
3) modified materials based on asphalt and resin.If the binder can be carbonized to form inlay structure and in situ to form carbon fiber material, then this binder will improve the high temperature performance of refractories.