Application conditions and characteristics of corundum self flowing castable

 Corundum material castable is mainly used for the installation of ladle purging plug. Because the use part is ladle bottom, the corundum material castable is mainly scoured by tapping molten steel and blowing oxygen to stir molten steel. During use of ladle, due to intermittent production, the temperature changes greatly, the castable is easy to exfoliate. At the end of pouring, the corundum material castable is subject to the chemical corrosion of ladle slag, so the self flowing castable should have good corrosion resistance. Corundum material castable has good thermal shock stability and strength.

The castables were successfully used in the bottom of a refining ladle with capacity of 80 tons. The service life could match that of well blocks and meet the production requirements.

Article Source:Application conditions and characteristics of corundum self flowing castable
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The characteristics of unshaped refractory materials

 The unshaped refractory materials (also commonly known as bulk refractories or monolithic refractory) refers to a certain level of the composition of the aggregate and powder, binding agents and additive composed of uncertain shapes and do not need to burn at high temperatures into immediate direct use of refractory materials.The refractoriness of unshaped refractory materials should generally be no less than 1500 degrees C, but some insulation unshaped refractory materials are allowed to withstand less than 1500 degrees C. Unshaped refractory materials usually have no fixed shape, are loose, slurry or paste-like, therefore, it also known as bulk refractories; In addition, unshaped refractory materials can also be made into prefabricated blocks to use or constitute a seam-free whole structure, so it also known as the monolithic refractory.

Unshaped refractories have the characteristics of simple production process, short production cycle, energy saving, good integrity in use, strong adaptability, and easy mechanized construction.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:The characteristics of unshaped refractory materials
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Brief introduction of ladle nozzle filling compound

 Ladle nozzle filling compound?(NFC) is an indispensable refractory material for EAF tapping. Ladle nozzle filling sand is mainly using fluorite from Henan and fused magnesia from Dashiqiao in Liaoning as main raw materials, and Hubei Yichang carbon materials as additives. According to the combination of specific particle size and weight percentage, NFC is prepared by mixing. After trial, it is proved that NFC has good dispersion fluidity, high refractoriness, no sintering, no clogging, and tapping rate. 100%, use temperature ≥1750℃, no chemical reaction with molten steel and alloy components, no variability in storage quality, can meet steelmaking process requirements, is the most ideal refractory material for EAF steelmaking.

The characteristics of NFC are as follows:
1) It is required to be able to sinter at a lower temperature to avoid accidents caused by the floating of NFC when molten steel is added;
2) It is required that the molten steel surface cannot be sintered too thick under high temperature and long-term smelting, in order to achieve automatic pouring, improve production efficiency, reduce molten steel pollution, reduce flue gas consumption, and improve production safety factor.
The ladle self-opening rate is related to the type and quality of drainage materials, pouring steel conditions, ladle refractory materials, and the level of operation of workers.

Article Source:Brief introduction of ladle nozzle filling compound
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The characteristics of zirconium

 Zirconium has good heat resistance and corrosion resistance and is widely used in many fields. The main sources of zirconium ore are Australia and South Africa. These two countries produce 65% of the world's output. Zirconium ore is chemically stable, strong resistance to corrosion of steel, and the expansion rate is small. High thermal conductivity. It is widely used as a refractory material.

Zirconium is one of the most abundant elements on earth. But high-quality zirconium ore is limited. Other materials are difficult to replace zirconium raw materials. Therefore, recycling should be considered. The zirconium sand commonly used in the market is mixed with silica sand and coexists with magnetite such as ilmenite rutile and monazite. The world's largest producer is Australia, where mines are concentrated on the east and west coasts, as well as resource ores such as ilmenite and rutile. Zirconia materials used in the refractories are zirconia desilication from zirconia inclined zirconia and electrofused zirconia. South Africa's inclined zircon mines have dried up, and mine supply trends in Russia need to be watched. In addition, high-quality zircons with low radioisotopes are in a declining trend, which requires attention to supply trends as well as oblique zircons.

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:The characteristics of zirconium
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Introduction of AMC Refractories

 AMC refractories are developed on the basis of high-performance magnesia and aluminium carbonaceous refractories, which are also an alternative material to high-alumina and dolomite brick ladle lining. But in contrast, made by acid-based two kinds of fire-resistant oxides, the aluminum-magnesium-carbon brick not only has excellent chemical and thermodynamic stability, but also has excellent thermal and mechanical properties.

1.High penetration resistance to molten steel. The whole refractory lining can be formed by the expansion of spinel reaction between the alumina and the magnesia during use, effectively preventing the infiltration of the molten steel into bricks from the joint between bricks.

2.Excellent slag resistance performance. In addition to the role of graphite, the spinel formation during using can absorb the FeO from slag to form a solid solution, and Al2O3 can react with the CaO of slag to form a CaO-Al2O3 compounds with high melting point, blocking the pores and increase Melt viscosity, to achieve the purpose of inhibiting slag penetration.

3.High mechanical strength. Compared with MgO-C and Al2O3-C refractories, Al2O3-MgO-C refractories contain less graphite, usually 6% -12%, so its bulk density is high and with low porosity and high strength.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us.?

Article Source:Introduction of AMC Refractories
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Lining method of EAF bottom ramming material

 Lining preparation

Clean up the permanent layer residue, dust, iron wire, plastic cloth and other foreign objects. Calculate the knot size, the actual knot thickness is equal to the required knot thickness multiplied by 1.09, and a sufficient amount of ramming material should be prepared according to the construction furnace slope and furnace bottom size requirements. After receiving the material, check whether the ramming material has debris and damp. The debris should be cleaned up. The damp material should not be used, and knotting equipment such as rammers and pneumatic picks should be prepared.

Lining method
After shoveling the material flat with a shovel, step on it with your feet to remove the air, insert the steel drill into the material and shake it repeatedly, and then use your feet to further solidify. The construction thickness of each layer of ramming material is 150~200mm. Appropriate, and then use a knotting implement to repeatedly beat it 3 times in a spiral from the periphery to the center.

The method to check the quality of knotting is usually to put a round steel with a diameter of 5mm on the ramming layer and press it down with a pressure of 10kg, and its depth does not exceed 30mm. Steel drills can be inserted forcefully during site construction, and the depth should not exceed 30mm.

The method of knotting the furnace slope is the same as that of the furnace bottom. First, use your feet firmly, and then use the knotting appliance to ram, the maximum angle between the furnace slope and the furnace bottom does not exceed 40°. Prevent rolling or collapse due to the furnace slope is too large.

Place bricks at the tapping mouth, furnace door and other places where molten steel is agitated and scour severely should be beaten vigorously and appropriately thickened to extend the service life of refractory materials in these damaged parts as much as possible.

After the ramming is finished, cover the 5~10mm thick steel plate on the ramming material to prevent the shape of the furnace bottom being damaged or the waste steel penetrates the ramming material layer when loading the scrap steel, which may cause the hidden danger of steel leakage. If steel cannot be made in time, 100~200mm thick lime is added to the iron plate to prevent the ramming material from hydrating.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc.

Article Source:Lining method of EAF bottom ramming material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Introduction of high alumina bricks

High alumina brick has high compressive strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, High alumina brick is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better.
High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) alumina brick and general alumina brick and so on.

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:Introduction of high alumina bricks
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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What are the properties of high alumina bricks

 High alumina brick is a commonly used refractory material, which is often used in building stacking. It has properties such as refractoriness, slag resistance, load softening temperature, thermal shock stability, and reburning line changes. Good performance, but you need to pay attention to the method of use if it is too heavy.

1. What are the properties of high alumina bricks
1. Refractoriness: High-alumina brick products are the advanced varieties of aluminum silicate refractory products, and their refractoriness varies with Al2O3. The content increases with the increase, generally not lower than 1750-1790℃.
For example, corundum bricks with Al2O3 content greater than 95%, the refractoriness can be as high as 1900-2000℃.
2. Load softening temperature: The load softening temperature of high alumina brick products decreases with the increase of silica and alkali metal oxide content. But it is higher than clay brick products, about 1420-1530℃.
Al2O3. The softening temperature of corundum bricks with a content of more than 95% can reach above 1600℃.
3. Slag resistance: As the aluminum oxide in high alumina brick products is neutral and high in content, these materials have strong resistance to the erosion of acid and alkaline slag.
4. Thermal shock stability: In high-alumina brick products, two crystals of corundum and mullite coexist, because the coefficient of thermal expansion of corundum is larger than that of mullite.
5. Reburning line change: If the high alumina brick product has sufficient firing temperature and sufficient firing time, the volume will be stable and the refire line change will be small. On the contrary, it will produce residual shrinkage such as clay brick products, which is also caused by recrystallization.

Article Source:What are the properties of high alumina bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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