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Low-carbon magnesia carbon brick less price high market share or will improve in the future
2015/06/10read:2703

Magnesia carbon brick is a rise in the 1970 s of the refractory material, with fused magnesia and sintered magnesia, flaky graphite as the main raw material, add organic binder, antioxidants. Magnesia carbon brick has excellent corrosion resistance, thermal shock resistance and thermal conductivity, it thoroughly changed the previous basic refractory spalling resistance is poor, the intrinsic defects of easy absorption of slag, and simple manufacturing process, are widely used as electric furnace, converter, and refining furnace lining materials, you can also make full use of raw material to produce recycled waste magnesia carbon brick, in saving resources and protecting ecological environment at the same time.

The carbon content of traditional magnesia carbon brick in 10-20%. But traditional magnesia carbon brick with high carbon content easy to pollution increased carbon in molten steel and molten steel, is not conducive to the pure steel and ultra-low carbon steel smelting, and also increase heat loss, high heat conductivity is difficult to meet the requirements of secondary refining process, but also consume a large amount of flake graphite resources. In order to adapt to the pure steel and ultra-low carbon steel smelting and environmental requirements, appeared on the market, total carbon content less than 8% low-carbon magnesia carbon brick. , however, with the decrease of carbon content in the brick, especially when carbon content less than 6%, the product of thermal shock resistance, slag resistance decreased obviously, and results in the decrease of low-carbon magnesia carbon brick spalling resistance.

In order to improve the spalling resistance of low-carbon magnesia carbon brick, Wu Ke and related enterprises to do a lot of research, mainly has the following several aspects:

A, the introduction of different carbon sources. Manufacturer will replace superfine graphite flake graphite, inhibition of burnt brick after China's entry into wto, reduce the elastic modulus of brick, improve low carbon MgO style - C brick spalling resistance. Other carbon source and the expanded graphite, nano carbon black, graphene, etc., the introduction of the carbon source can achieve common carbon refractory in the effect of 4-10% of graphite, but the introduction of graphene Wu Ke big is still in the experiment.

Second, magnesia for surface treatment, make bricks formed in the process of heat treatment is more continuous distribution of tiny pores, thus lowered the thermal conductivity of magnesia carbon brick, thermal shock resistance.

Three, use do not contain organic combination of phenolic agent. Traditional phenolic resin carbonized organization was glassy state structure, make the material of the spalling resistance is poor.

Nano carbon black and kyushu refractories company has been developed by adding a small amount of boron carbide carbon mass fraction of 3% low-carbon magnesia carbon brick, its performance and graphite mass fraction of 18% magnesia carbon brick, thermal conductivity is lower. Our country's independent co., LTD. Zhejiang made with Wu Ke joint development of the low-carbon magnesia carbon brick series of products is also in baosteel, wuhan iron and steel ladle slag line and the wall has been applied. In addition, the smelting low carbon, low carbon steel mills and foundries are also in the use of low-carbon magnesia carbon brick, such as jisco, taigang, shougang, Beijing shougang tang, such as double are used.

Smelting, in general, the ordinary stainless steel, use the carbon content of 6% low-carbon magnesia carbon brick; Smelting 439 #, 444 # ultra-low carbon stainless steel, the use low-carbon magnesia carbon brick of carbon content is 4%. Use low-carbon magnesia carbon brick replace magnesite-chrome brick ladle refining stainless steel ladle, not only greatly improve the service life of the ladle, reduce the production cost of stainless steel, but also can solve the magnesite chrome brick of hexavalent chromium in environmental protection, prevent environmental pollution.

Although low-carbon magnesia carbon brick has certain advantages, but because of the introduction of carbon source high raw material prices, costs, high of price for low-carbon magnesia carbon brick. Carbon-steel, however, the market downturn situation all the way, the iron and steel enterprises is turning to clean steel production has a competitive advantage, high-end or ultra low carbon steel, the market share of low-carbon magnesia carbon brick could be improved.

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