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Refractory industry functional repair material properties and USES

Number of visits: Date:7/29/2016

  Definition: the functional repair material is mainly used for converter, electric furnace and refining furnace and ladle and other special parts, such as furnace bottom, the bottom of the bag, air brick, block, and skateboards brick, etc., its technical requirements is easy to spread, good sintering and high strength. Some require air permeability, in order to repair air brick, called and repair material. Drainage sand is filling out the steel material, also is such. Every time this kind of material consumption, but important, and functional refractory material compatibility is used, therefore calls the functional repair material, also known as a new type of repair material.

  1, new repair material

  Use level of fused magnesia, middle-grade magnesia and fused spinel as main ingredient, adding fused white corundum powder and alpha Al2O powder, organic and inorganic compound binder and adding explosion-proof agent; No. 2 with secondary fused magnesia, middle-grade magnesia and sintered spinel as main ingredient, adding a small amount of powder, also use compound binder and hardening agent and explosion-proof agent; Number 3 and number 4 electricity fused white corundum, fused magnesia and fine powder, and add binder and additive, number 5 replace fused magnesia with zircon. No. 1 air brick, magnesite mending material for converter number 2 ~ 5, respectively magnesite mending material, the ladle vent brick block just the jade vulcanizing containing zirconium material and its surrounding fused alumina magnesia joint sealant. And repair materials are the key technologies of particle gradation and the reaction, the sintering degree of control, so as to obtain good ventilation effect. Air brick and nozzle brick and generally use the stick, such as the joint sealant, its chemical composition (%), Cr2O34 Al2O365-86-15, coherence time is 1 ~ 3 min, drying compressive strength p 1 mpa, 1500 ℃ compressive strength p 6 mpa. The material particles is 0.074 mm or less 90% or higher.

  2, drainage sand

  Drainage sand is at the bottom of the ladle nozzle loose material for filling, each with one at a time, is not patching material, also have a resemblance. Are the technical requirements for drainage sand, steel in high temperature and long time, the sintering layer is not thick, nor with the surface of molten steel, middle and upper for transitional zone, some remain lower raw material status, convenient automatic cast starting flowing molten steel. The main varieties are siliceous, MgO style - C quality, Cr2O3 - C quality, MgO style - CaO rocky, magnesia, magnesium olivine and Al2O3 - ZrO2 - C quality, etc.

  Drainage sand material choice, is based on the ladle steel grade and size, smelting temperature, refining and cc ratio conditions, such as general shall ensure casting steel cast starting rate above 90%. When drainage sand material was determined, its grain composition is very important. For example. JiaChang grading for 3 ~ 2 mm is 20 ~ 25%, 2 ~ 1 mm to 70 ~ 75%, 1-0.5 mm is 4 ~ 6%; YiChang grading for 3 ~ 1 mm or greater 55%, 1-0.5 mm of 45% or higher. At the same time, in the preparation of drainage sand, increased slip agent is added and sintering regulator, in order to achieve the goal of appropriate fill compaction and sintering layer. The work must be in refractory material, under the guidance of basic theory and practical experience to good use effect.

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