At the very beginning, clay brick is used for building ladle. However, as the ton steel consumption is high, it has been taken place by unshaped ramming mass. The integral ladle built with ramming mass was characterized with longer service life and lower ton steel consumption, and labor amount is also less.
However, some small steel plants cannot melting molten steel continuously, and with integral ladle it is neither convenient to handle nor convenient to replace well block. So if we still insisting on using ramming mass to build ladle, then energy waste will be huge. What is worse that the service life of a ladle will be only 8-10 heats, and bleed-out will happen frequently.
In order to solve those problems, Henan Xinmi Changxing Refractory Material Co., Ltd. started to do some researches and then successfully manufactured magnesia carbon bricks. The magnesia carbon brick made by Changxing Refractory has the following characteristics.
Using fused magnesite, high purity magnesium sand and graphite as raw refractory material, and then through high-pressure molding and low temperature treatment finally we made the magnesia carbon brick. The bricks can be used for both ladle and EAF, and whose service life is not less than 100 heats for ladle, and 120 heats for EAF.
What is more, Changxing Refractory not only provides products, but also dispatches engineers to help clients build furnace to guarantee our magnesia carbon bricks reach the service life we just stated.
Possessing with the excellent corrosion resistance and high thermal conductivity which can lead to easily form a protective layer for blast furnace hearth, carbon bricks have been used as refractory material for hearths for more than half century.
To further improve its performance, the refractory experts have carried out many investigations recently. Finally, they find out some main reasons which caused the damage. They are including as below.
1) The penetration of molten iron into pores.
2) Erosion due to direct contact with molten iron (dis-solution by carburizing).
3) Embrittlement of the material on hot side (loss of cooling capacity).
In order to enhance its corrosion resistance, the experts have developed new technology to get new refractory carbon brick through numerous experiments.
1) Add the aluminum oxide which has a good resistance to molten steel.
2) Reduce the pore diameter to prevent the penetration of molten steel and other impurity items.
3) Enhance the high thermal conductivity to reduce the surface temperature.
4) Add the TiC to improve the corrosion against molten steel, increase its viscosity and slow down the flow which could effectively reduce the damage on carbon brick.
In recent years, silica ramming mass is widely used in induction furnace. Compared with traditional refractory lining material, this product is of lower cost, shorter sintering time and better working condition.
To offer clients better refractory products, we have successfully developed our 25+ heats silica ramming mass. As per actual working, we summed up the material consumption as following.
1. First heat: 10-15mm
2. Rest heat: 3-5mm
As per our experience, we should leave 70mm as save level. So if the
lining thickness is 180/300/450mm, we could promise the least service life of our refractory material to be 25 heats. If the working condition is convenient, 30-40 heats is no problem.
Furthermore, our silica ramming mass can also be applied in tundish and ladle. Service life can namely be 48-60 hours/ 200+ heats.
Because of the great advantages as above, our silica ramming mass is very welcomed by our clients all over the world say Bangladesh, Ghana, South Africa, and Indonesia, etc. If more interests, please feel free to make us informed, our professional teams are ready to give you our reliable service. For new clients, we would offer more preferential as following.
1. Lower price trial order
2. Professional refractory technicians overseas service
Therefore, what are you waiting for? Take your phone and call us!
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