The Application of Forsterite Coating Material in Tundish

TheApplication of Forsterite Coating Material in Tundish

Forsterite uses natural olivine and medium grade and sintered magnesia as raw material, light burned magnesia powder, silica powder, Guangxi white mud, talc as binding agent and additives.

It has been proved that the service life of forsterite coating material and magnesia coating material are almost the same, which is 10-14 hours. After 10-14 normal using in CCM, the sintered layer thickness is mostly less than 30mm, which is about 10mm less than that of magnesia coating material. It means the thermal insulation performance of forsterite coating material is better. It is not likely to be sintered with permanent layer, which is easy for separation between the two layers. During the drying and preheating stage, the carbonate and sulfate in the raw material are decomposed and evaporated, so there will be no hydrogen absorption, recarburation or resulfurization during the tapping of molten steel. There is a stable spinel adhesive layer formed after the forsterite coating material is in touch with molten steel, which can prevent secondary oxidation of molten steel.

Different Types of Sliding Mechanism Used for Ladle Furnace

Different Types of Sliding Mechanism Used for Ladle Furnace

As a refractory factory, We Henan Xinmi Changxing Refractory Material Co,. Ltd supply various types sliding mechanism for ladle furnace. Now we would like share with you as follows.

Generally speaking, there are two types of sliding mechanism: Manpower and Hydraulic pressure.

1.       Manpower

a.       C40  used for ladle with capacity of 10-30 tons

b.       B50  for 20-30 tons

c.       B60  for 40-50 tons

2.       Hydraulic pressure

d.       250  for 20-30 tons

e.       310  for 40-60 tons

f.        359  for 50-80 tons

g.       400  for 60-100 tons

h.       459  for 80-150 tons

Apart from sliding mechanism, we manufacture ladle nozzle and slide gate plate as well, customized size are acceptable, welcome for inquiry!

Sliding Mechanism

How to Prolong Service Life of Slag Line Magnesia Carbon Brick

How to Prolong Service Life of Slag Line Magnesia Carbon Brick

        In order to improve the service life of slag line magnesia carbon brick, please pay attention to the following matters:

1.  Adopt high purity raw material and suitable additives, make sure the apparent porosity of magnesia carbon brick is no more than 3 percent, the carbon content in slag line magnesia carbon brick should be no less than 14 percent.

2.  Ensure high bulk density.

3.  Strictly control the appearance quality of slag line magnesia carbon bricks, make sure the connection between each two bricks and each layer are good, and decrease the possibility of slag erosion along brick joints.

4.  Use brine to mix magnesium powder to fill the brick joints during brickwork to decrease the possibility of slag erosion along brick joints.

5.  Use more mortar or other filling material in the corners.

                                                  Magnesia Carbon Brick

The Role of Aluminum in Magnesia Carbon Brick

    The main effect of adding aluminum powder into magnesia carbon brick is antioxidant. The presence of carbon in magnesia carbon brick is to prevent slag erosion in the brick, and carbon itself has the characteristics of easy oxidation. When carbon in magnesia carbon brick is oxidized, the erosion resistance of brick is declined sharply, which will accelerate the damage of the brick, reduce its service life. In order to prevent the oxidation of carbon, we add metal aluminium powder to protect the carbon in brick. The reaction mechanism is as follows:
    1. when magnesia carbon brick is heated, active metal aluminum in brick will firstly react with carbon, became high melting point carbide, then carbon will reunite, getting Al4C3 and Al2O3. Al4C3 will stay on the surface of MgO, to prevent the penetration of slag erosion. In this way, it will improve the bricks erosion resistance, slag resistance and spalling resistance.
    2. When the magnesia carbon bricks under high temperature condition, active aluminum will be oxidized and become high melting product Al2O3. It is a phase change process from metal into nonmetal, the volume of oxidation Al2O3 will have a expansion, making the pores in brick be dense, increasing bricks bulk density and forming the ceramic combination, so as to improve the bricks high temperature rupture resistance.

Magnesia Carbon Brick

Advantages of Building Ladle with Magnesia Carbon Brick -- Changxing Refractory

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. 

magnesia carbon brick

Technical Innovation of Carbon Brick for Blast Furnace Hearths--Changxing Refractory

    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.

The Best Refractories for Induction Furnace -- 25+ Heats Silica Ramming Mass

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!

Intermediate Frequency Induction Furnace Lining Material