Magnesia carbon brick is the key auxiliary material to support the efficient operation of iron and steel production

(1) Production safety, as the material contacting with molten steel, abnormal damage or excessive erosion of functional refractories may cause molten steel leakage and even cause serious safety accidents. Such as breakout caused by excessive erosion of gas permeable elements, splashing of molten steel caused by abnormal fracture of submerged nozzle in service, flow control failure caused by excessive corrosion of plug rod, breakout caused by failure of side sealing plate, etc.

(2) Production efficiency, refractory material for metallurgical furnace is the key link of iron and steel production, its performance has an important impact on steel production efficiency. The damage and function failure of air permeable elements and slide plates in use will be replaced offline, reducing the turnover times of ladle; immersion water table, stopper bar and side sealing plate are one of the key control links of continuous casting furnace number, and excessive erosion, erosion and abnormal fracture of materials will reduce the number of continuous casting heats, and then affect the steel production efficiency.

(3) The function of refractories used in metallurgical furnaces is particularly important for the quality of billets.

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The stirring effect of the gas permeable element has an important influence on the uniform composition and temperature of molten steel and the promotion of alloying; the long nozzle and submerged nozzle protect the molten steel from secondary oxidation, and the function of the submerged nozzle to control the flow field in the mold plays an important role in promoting the floating of inclusions, reducing slag entrapment and stabilizing the flow field; the silicon-free and carbon free submerged nozzle with anti clogging function can not only reduce the impact on the secondary oxidation of molten steel, but also reduce the number of inclusions The results show that the carburization and silicon addition of molten steel can avoid the adhesion of alumina in the nozzle and reduce the large inclusions in the billet; the magnesium carbon submerged nozzle can avoid the introduction of alumina inclusion in the molten steel, which is conducive to improve the quality of cord steel.

The results show that setting reasonable turbulence controller in tundish, optimizing weir and dam combination, using gas curtain wall to reduce dead zone can optimize molten steel flow path, promote inclusion floating and improve billet quality; optimize stopper rod head shape, improve molten steel flow control sensitivity, reduce liquid level fluctuation in mold, and reduce slag entrapment possibility; overall stopper rod head can also be reduced by setting argon channel Low alumina adhesion improves billet quality.

Therefore, the performance and service behavior of refractories used in metallurgical furnaces have an important impact on the safety and efficiency of iron and steel production, especially on the production of high-quality steel.

Features of lightweight high alumina brick:

Lightweight high alumina brick has the characteristics of small bulk density, low thermal conductivity, excellent heat insulation performance and stable quality. It can be used for lining or insulating layer of various high temperature furnaces. The mechanism is formed at one time, burning the addition process, while retaining the traditional foam to light method, casting molding, uniform cross-sectional structure of the products, pore forming complementary honeycomb, so that the product's compressive strength and heat insulation performance can reach a higher level. The shape of all products are ground and shaped, and the size deviation is small, which can meet the special needs of furnace masonry.

Content of lightweight high alumina brick products:

Lightweight refractories with alumina content of more than 48% are mainly composed of mullite, glass phase or corundum. The bulk density was 0.4-1.35g/cm3. The porosity is 66% ～ 73%, and the compressive strength is 1 ～ 8Mpa. The thermal shock resistance is good. Usually, bauxite clinker and a small amount of clay are usually used. After being fined, it is poured and formed in slurry form by gas generation or foam method, and is sintered at 1300~1500 degrees. Sometimes industrial alumina can be used to replace part of bauxite clinker. It is used for lining and insulating layer of furnace, as well as parts without strong erosion and erosion of high temperature molten materials. When contacting with flame directly, the surface contact temperature shall not be higher than 1350 ℃.