Introduction of dolomite bricks

The dolomite bricks, is a kind of magnesial refractory material with periclase as principal crystalline phase and tricalcium silicate as secondary phase. It contains 80 % ~ 87% MgO, 6 % ~ 9% CaO, CaO/SiO2 ratio is between 2.2 ~ 3.0. Its significant structural feature is periclase directly contact with dicalcium silicate and tricalcium silicate, making eutectic solution-4 Cao-Al2O3-Fe2O3 fill into crystal gap between dicalcium silicate and tricalcium silicate. Its porosity is low, the refractoriness under load is higher than 1700 ℃. It has good alkaline slag resistance ability, but with poor thermal shock resistance.

Made by calcium magnesia sand as refractory raw material, it will be made by firing at 1550~1600 ℃ after crushing, burdening, mixing and molding. It will be used at eye place of side-blown converter, top place of open-hearth furnace and oxygen-blown converter etc.

Magnesia-calcium brick has seven properties: High temperature resistance, slag resistance, spalling resistance, wear resistance, purifying molten steel and hydration resistance performance.

With the increasing production of stainless steel and all kinds of clean steel products, the demand of various magnesia calcium brick are increasing accordingly. For better production and using correctly, detailed understanding and learning of working performance and influencing factors of dolomite bricks are very necessary.
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:Dolomite
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The advantages of Magnesia Carbon Brick

Changxing Refractory is able to manufacture magnesia carbon brick for every ladle, EAF, and BOF. We will design you a well-balanced lining, providing optimal performance at the lowest possible cost. Our magnesia-carbon brick is made from more than 98% electrically fused magnesite, high purity graphite and metallic antioxidants as needed. Size and specification can be tailored according to furnace type.

Changxing Refractory’s magnesia carbon brick factory is located in the magnesium capital of China, and products with high bulk density and low porosity.

Magnesia carbon brick series used for the electric furnace are made by adoption of fused magnetite, high-purity magnesium sand and graphite as principal raw material, through high-pressure molding and low-temperature treatment. This product is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. According to the smelting conditions and the kind of smelting steel, different brands magnesia carbon bricks are available.

Magnesia-carbon bricks are resin bonded bricks containing high-purity fused and or sintered magnesia and flake graphite as their main ingredients.

Advantages:

Magnesia carbon brick has excellent corrosion resistance together with good thermal shock properties.
Magnesia carbon brick offers good oxidation resistance due to use of high purity flake graphite.

Application:

Magnesia carbon brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.
Specific Application:The lining and tap hole of Steelmaking Convertor, the sidewall and slag line of High Power Electric Arc Furnace and ladle slag line.
Article Source:Magnesia Carbon Brick
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Common problems that arise during the use of ladle

(1) It is often encountered to replace the ladle caused by argon blowing. Replacing the ladle will not only delay the smelting time, but also the process of replacing the ladle will bring safety problems, and it will cause the molten steel to take in air and bring in some inclusions during the process of changing the ladle. Inclusions increase the difficulty of smelting and increase the cost of smelting.

(2) The slag line is seriously eroded, and the slag line usage rate is low. Frequent replacement of the slag line will increase smelting costs, and it is also not conducive to the normal operation of smelting, prone to leakage of molten steel, which brings certain hidden dangers to production.

(3)The ladle brick is short in service life and needs to be replaced frequently.

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:Common problems that arise during the use of ladle
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Ways to improve the life of RH furnace lining

1.Different steel grades, such as ultra-low carbon steel and low carbon steel, have different refining processes and conditions, and the requirements for refractory materials of furnace lining are also different. It is recommended that steel mills concentrate different steel grades in different furnaces in order to select the appropriate refractory material according to the refined steel grade.

2.The corrosion mechanism of different parts of the RH furnace is different. Therefore, the appropriate refractory raw material should be selected according to the specific conditions of different parts during refining, and the integrated furnace should be carried out.

3.Control the refining temperature, do not exceed 1650 °C.

4.Improve the use efficiency of the RH refining furnace, increase the daily refining furnace times, shorten the intermittent time, and adopt insulation measures during the interval to reduce the temperature fluctuation in the furnace.
5.Monitor the erosion of the dip tube and perform spray repair during the rest period between the two furnaces. Increasing the life of the dip tube and reducing the number of times the dip tube is replaced can reduce the structural spalling caused by the large temperature fluctuation in the lower part of the vacuum chamber.
6.When replacing the dip tube, the lower part of the vacuum chamber, the bottom of the furnace, the throat and other parts can be sprayed and repaired immediately, or the ramming material can be filled in the throat to be repaired.
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:Ways to improve the life of RH furnace lining
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/