Erosion of magnesia carbon brick in the ladle furnace

In the ladle, due to the complex physical and chemical environment of the slag line, the furnace lining is the most vulnerable to damage. The chemical attack of steel slag on the magnesia carbon brick is mainly through the dissolution of magnesia and the oxidation of the graphite in the brick body. Under the combined action of two factors, the magnesia carbon brick is damaged.

1. The effect of alkalinity: the lower the alkalinity of the slag, the more beneficial it is to the erosion of magnesia-carbon bricks. The increase in alkalinity of the slag will reduce the activity of FeO in the slag, and the decrease of FeO activity will lead to the diffusion capacity of FeO.

2. The influence of MgO: Osbom et al. found that the MgO content in the reaction layer of the residual bricks of the LF slag line is very high. When the MgO content in the slag is low, it will affect the refractory magnesia carbon brick. The erosion rate of bricks is very large, and the lower the alkalinity, the faster the erosion of magnesia carbon bricks.

3. The influence of Al2O3: Al2O3 in the slag will reduce the melting point and viscosity of the slag, which greatly increases the penetration and erosion of the magnesia carbon brick by the slag, and can also corrode the magnesia from the magnesia grain boundary, making periclase Dissociate.

4. The influence of FeO: Firstly, FeO in the slag easily reacts with the graphite in the magnesia carbon brick at high temperature, and produces bright white iron beads to form a decarburized layer as shown in Figure 1. Secondly, the magnesia will interact with the graphite in the slag. FeO will form a low melting point of rich magnesium. AT&S believes that in the process of repeated heating and cooling of the ladle, due to the phase transformation between the magnesium richite and the mafic ore accompanied by the volume change, the magnesia on the working surface will crack, which will lead to the formation of magnesia. Dissolution, foreign studies believe that the increase in iron content in steel slag is detrimental to the life of ladle magnesia carbon bricks. First, iron oxides accelerate the oxidation of graphite, and secondly, it increases the solubility of MgO in the slag and accelerates the dissolution of periclase. The combined effect of the two is the erosion of magnesia carbon bricks.

Article Source:Erosion of magnesia carbon brick in the ladle furnace
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Development of ladle lining refractory materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, high alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladle refractories.

In earliest 20th Century 50--60 years, a variety of clay bricks were mainly used in our country. Due to low cost, until the 1980s, some steel plants were using clay bricks as ladle lining material. Although clay bricks is no longer used as ladle material so far, it had made a great countribution for recovery and future development of China's steel industry in the early days.

With the continuous development of steelmaking technology, steel quatity and quantity, clay bricks was no longer used because of short service life. Some of our mills started using a variety of high alumina bricks as ladle lining material, in which way the ladle life got a greatly improvement.

With the continuous improvement of steelmaking technology, high aluminum ramming mass, wax brick, alumina magnesia, aluminum-magnesium casting material, aluminum-magnesium unfired brick, aluminum-magnesium spinel castable, aluminum MgO-C, magnesium aluminate spinel brick, aluminum-magnesium unfired brick and a series of high-grade refractory materials appeared to adapt to higher demand.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Development of ladle lining refractory materials
Company name:?Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Performance advantages of corundum castables prefabricated parts

1) Advanced: The bottom of the ladle is lined with corundum spinel prefabricated bricks, which has a significantly improved performance compared with the traditional alumina magnesia carbon bricks, and solves the problem of low life of traditional alumina magnesia carbon bricks under LF refining conditions;

2) Comprehensive masonry realizes long life and economy of ladle: Since the refining of ladle is LF, it is necessary to ensure synchronization with the long life of the slag line. It also reduces the loss of refractory raw materials, taking into account the long life and economy of the ladle;

3) Small pollution to molten steel: The refractory material used is excellent in scour resistance and erosion resistance, and the amount of refractory material entering the molten steel per furnace is small, and the pollution to molten steel is small;

4) High construction flexibility and effective control of working time; high thermal intensity.

The corundum castable prefabricated parts are characterized by high-temperature strength, which is greatly improved compared with the previous precasts.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Performance advantages of corundum castables prefabricated parts
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/