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Henan Changxing Refractory Material Co.,Ltd.

BOF Furnace Refractory

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Magnesia Carbon Brick for Converter

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Magnesia Carbon Brick for Converter Introduction:Magnesia Carbon Brick for Converter are designed according to different operation conditions and application areas of the converter lining. The bricks are made of pure flake graphite and large fused crystal magnesia which has high purity and density. Added with special antioxidant and use resins as binders and finally shaped under high pressure.Magnesia carbon brick is generally required that the content of MgO in magnesia should be greater than or equal to 95%, and the content of C in graphite should be greater than or equal to 94%. Magnesia carbon brick use electric fused magnesia sand,high purity magnesia sand,magnesia sand,Re-burn magnesium sand,High-quality graphite and Bauxite additives as raw material.  The charging side requires magnesia carbon bricks to have high resistance to slag erosion, high temperature resistance and good peeling resistance. Therefore, high-strength magnesia carbon bricks with metal antioxidants are usually used.  Magnesia Carbon Brick for Converter Advantages:1.good erosion resistance2.thermal shock resistance
Tap Hole Brick

BOF Refractories

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Tap Hole Brick Introduction:Taphole brick is made of high purity fused magnesia and large crystal magnesia, mixed with high purity flake graphite and added with special antioxidant and resin binders,usually shaped by cold isostatic presses. The Tap Hole Brick of converter is one of the most important technical indexes of steel melting, which directly affects the melting period, productivity and slag retaining,therefore affects the quality of steel.Our whole Tap Hole Brick achieve multiple people laying the furnace, improve the speed of laying, shorten the whole laying time, the Tap Hole Brick repair material reduced, and reduce the steel flow to improve the quality of molten steel, reduce the steel process temperature drop, enhance the Tap Hole Brick erosion resistance and mechanical erosion resistance. Tap Hole Brick Advantages:1.Tap hole brick is characterized by good oxidation resistance2.high strength, good corrosion resistance3.good integrity, easy replacing and long life 4.Tap hole brick is ideal material taphole of large and medium furnace Tap Hole Brick Influence： The taphole life is one of the important indicators of the converter sliding plate slag blocking technology. The taphole is easily damaged due to frequent direct erosion and violent erosion of high-temperature molten steel and high-oxidizing slag, combined with the effects of rapid cold and heat. The length of its life directly affects the converter smelting cycle, steelmaking productivity and slag retaining effect, which in turn affects the quality of steel. The integrity of the tap hole directly controls the amount of slag in the converter, and has a direct impact on the alloy yield and the next refining process. Measures to improve the application of refractory materials:1. Improve and optimize the material and structure of the skateboard to greatly increase the service life2. Measures to improve the overall life of the taphole port during the converter tapping process
Bottom Blowing Purge Plug

BOF Refractories

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Bottom Blowing Purge Plug Introduction:The bottom blowing purge plug produced by Changxing Refractories use high quality magnesia-carbon bricks. Under normal conditions, the adequate pipes could guarantee the high rate of opening and stable gas flows of the purging plug and meet the demands of top-bottom gas purging at the same time. The particle gradation of aggregates, fine powders, binders or admixtures in the ingredients will have different effects on the strength, flexural resistance and thermal shock resistance of the Bottom Blowing Purge Plug.The bottom of the furnace mainly stores molten steel, which is subject to the erosion and penetration of flowing steel slag and molten steel. Bottom Blowing Purge Plug Advantages:1.steady quality2.reliable performance3.precise permeation volume4.high success rate5.good erosion resistance 6.melting loss resistance7.no penetration of steel8.no sticking of slag9.no use of oxygen burning after use
Converter Furnace Patching Material

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Converter Furnace Patching Material Introduction:Converter Furnace Patching Material is suited for easily-worn lining such as trunnion area, taphole area and large working surface in converters. Mainly applied for converter furnace hot patching, and suitable for periodic manufacturing.When converter furnace working, and the patching material will flow to pit and fill broken departs. Thus to finish hot patching work. Converter Furnace Patching Material Advantages:1. Patching material mainly made from high purity magnesia sand and synthetic dolomite sand, and mixed with wetting agent and agglutinant.2. In high temperature ,which has performed flowability and can spread out automatically.3. Scientific proportioning, low melting point, fast sintering speed,high adhesion, erosion resistance, long service life, environment friendly, suitable for patching broken departments4. Saving time, energy conservation, improve furnace service life, does not pollute molten steel.
Slag Ball

BOF Refractories

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Slag Ball Introduction:Slag Ball is made of light burnt magnesia, magnesite powders and shaped through presses. Skimming Ball / Skimming Cone are mainly used for the slag splashing, which can effectively improve the performance of Converter. During the tapping process, the molten steel level will decrease gradually. When it reaches a critical value, swirls will emerge in the upper area of tapping hole and draw the slag into the ladles. When the slag limiting ball is put into swirls, the ball will be lay in the upper area of tapping hole, thus the slag can be prevented from flowing into the ladle. The molten steel will flow out from the gaps between the limiting balls and tapping holes, so as to decrease total flowing slag amount. The density of the slag ball is between molten steel and slag, and it is put into the furnace near the tap hole near the end of tapping. With the decrease of the liquid level of molten steel, the slag ball sinks to block the tap hole, so as to prevent the slag from entering the ladle. The reasonable density of slag ball is 4.2 ~ 4.59/cm3. The slag retaining ball has a spherical structure, and its center is made of cast iron block, raw iron chip pressing block or small waste steel billet, and its exterior is covered with refractory clay. High alumina refractory concrete or magnesia refractory clay with high alumina refractory concrete or refractory brick powder as admixture can be used. The diameter of the slag ball should be slightly larger than the diameter of the tapping hole to play the role of slag blocking. Slag-blocking balls are usually put into use between 2/3 and 3/4 of the steel output, and the hit rate of slag-blocking is high. The slag is too sticky, which affects the slag blocking effect. The slag viscosity is high, so the slag blocking ball can be put in early to improve the hit rate of slag blocking. Slag Ball Advantages:1.high strength2.high throwing accuracy3.slag control efficiency
Light Calcined Magnesia Ball

BOF Refractories

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Light Calcined Magnesia Ball Introdution: Light calcined magnesia ball is mainly used as a slag composition regulator for converter slag splashing.Light calcined magnesia ball is made from extra light calcined magnesia and mixing with additive agent, then made into ball with ball press machine or balling pan. After added to converter final slag and light calcined magnesia ball will has reaction very  fast, thus to adjust slag content and made main content into high melting point MgO, C2S and C3S. What’s more, light calcined magnesia ball also can adjust furnace slag dynamic viscosity and high refractoriness, thus improve performance of slag-sp lashing. Light calcined magnesia ball has performance of high speed reaction, adjusting slag content obviously, thus can improve converter furnace service life. Light Calcined Magnesia Ball Advantages: 1. High working temperature2. Completely fireproof3. Strong overload protection capability4. Excellent anti-corrosion and explosion proof5. Long service life6. Better laying flexibility Light Calcined Magnesia Ball Speciality： The light burnt magnesia ball is made by using ordinary light burned magnesia powder and pressing the ball after mixing. Light-burned magnesia balls are mainly used for converter steelmaking and slag splashing to protect the furnace, which can improve the life of the converter. The preparation of light-burned magnesia ball is to add 80% light-burned magnesia powder to 20% water, put it into a milling machine for rolling, stirring, and mixing for 15 to 20 minutes to form a mixture, and then send it to the ball press through a belt conveyor to prepare the product , And then stacked. The light-burned magnesia ball is ready for sale after being dried in the shade for 48 hours and forming strength. Light Calcined Magnesia Ball Effect: The light-burned magnesia ball is used as the slag protection component regulator of the converter slag splash protection. Because the slag splashing protection requires the slag to have suitable viscosity and refractoriness, a reasonable slag composition is the key to implementing slag splash protection. The general slag can not be directly splashed to protect the furnace, and a certain amount of magnesium oxide ball needs to be added for adjustment, while replacing the use of dolomite, reducing the amount of slag and increasing the content of MgO in the slag.