• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a magnesia-carbon brick for electric taphole, 100% by weight of raw material consisting of sintered and molten magnesia clinker of purity of 98% or more, 83-87wt%, impression graphite 13-17wt%, silicon carbide 6-8wt%, It is composed of antioxidant consisting of 2-4wt% of aluminum and 1-3wt% of magnesium / aluminum alloy and binder consisting of 4-5wt% of phenolic resin. Although oxidative and slag resistance can be exhibited, it is easy to supply and receive and is inexpensive in terms of price.
    公开号:KR19980052568A
    申请号:KR1019960071583
    申请日:1996-12-24
    公开日:1998-09-25
    发明作者:이강용；김영국
    申请人:서상기；포철로재 주식회사；
    IPC主号:
    专利说明:

    Magnesia-carbon brick for furnace taphole
    FIELD OF THE INVENTION The present invention relates to magnesia-carbon bricks, and more particularly to magnesia-carbon bricks for furnaces with increased oxidation resistance and hot strength.
    In recent years, the development of electric bottom tapping (EBT) electric furnaces with large capacity eccentricity has been actively progressed to improve the quality and productivity of high quality steel in electric furnaces. Side magnesia-carbon bricks are used, but their contents and thermal characteristics do not meet the needs of users, and to overcome these problems, stabilization of the current furnace operation and the introduction of DC furnaces The tap hole brick on the tapping side is emerging as the neck point rather than the hot spot side. However, since the raw materials for the bricks used in the electric furnaces are the highest grades, the supply and demand of raw materials are difficult, and the price of the bricks is high, and there are many problems that are difficult to solve for general electric furnaces.
    Accordingly, the present invention was devised to solve the above problems, while maintaining the wear resistance, spalling resistance, oxidation resistance, slag resistance, which are the characteristics required for the tap hole brick, the supply and demand is easy, and the price is easy. The objective is to provide a low cost electric furnace magnesia-carbon brick for tapholes.
    The present invention for achieving the above object is to select the type and the appropriate amount of the antioxidant, to adjust the optimum particle size of the magnesia aggregate, to properly select the graphite content to strengthen the matrix of magnesia brick to meet this demand It is necessary to design the product to satisfy the characteristics required for the taphole brick by testing the possibility of using special carbon. Accordingly, the appropriate amount of silicon carbide and graphite affecting hot strength, oxidation resistance, and corrosion resistance is selected, and the amount of raw material having the most suitable physical properties is selected by adjusting the particle size of magnesia clinker, which is a main raw material, which is used step by step. Magnesia-carbon bricks for tapholes according to the present invention are 100 wt% raw material consisting of sintered and molten magnesia clinker 83-87wt% with purity over 98%, impression graphite 13-17wt%, silicon carbide 6-8wt%, and aluminum 4-4wt%, It is characterized by consisting of an antioxidant consisting of 1-3wt% of magnesium / aluminum alloy, and a binder consisting of 4-5wt% waste waste resin.
    In addition, as another embodiment of the present invention, the raw material consisting of 83-87wt% sintered and electrolytic magnesia clinker with purity of 98% or more, 13-17wt% of impression graphite, 6-8wt% of silicon carbide, 2-4wt% of aluminum, Special carbon powder 0.5-2wt% is added to the magnesia-carbon brick for the taphole, which is composed of an antioxidant composed of a magnesium / aluminum alloy 1-3wt% and a binder composed of a 4-5wt% phenolic resin.
    1 is a comparative diagram illustrating the difference in bending strength between the comparative example and each example
    Figure 2 is a comparison diagram illustrating the difference between the weight loss rate and the decarburization rate of the Comparative Example and each Example
    Figure 3 is a comparison diagram illustrating the difference between the erosion length according to the erosion conditions of the Comparative Example and each Example
    Hereinafter, preferred embodiments of the present invention will be described in detail.
    First, in order to select an appropriate amount of silicon carbide, the amount of silicon carbide added to each of the raw materials and subsidiary materials 100% was 3-7%, respectively. At this time, the physical properties of the prepared specimens were compared with those of the current product. As a result of increasing the amount of silicon carbide added, hot strength, oxidation resistance and corrosion resistance were improved, and the thermal properties of the silicon carbide 7% additives were approximately 30%. Improved results.
    In addition, in order to select the appropriate amount of graphite, 7% of the appropriate amount of silicon carbide was added into the compound, and the content of graphite was increased to 13-20%. As a result, the smaller the content of graphite, the higher the hot bending strength, the oxidation resistance, the corrosion resistance, and the like. All thermal properties have been improved, and excellent thermal properties have been achieved compared to current products. Therefore, the appropriate amount of graphite was 13%, and the purity was selected as 98%.
    After selecting the appropriate amount of the participant through the test as described above, after mixing according to the composition ratio of the raw materials and subsidiary materials applied to the current product and the composition ratio of the raw materials and subsidiary materials applied to the development product of the present invention, as shown in Table 1, the test piece To determine the components and physical properties as shown in Table 2.
    TABLE 1
    (Unit: wt%)
    TABLE 2
    Hereinafter, more specific examples and comparative examples of the present invention will be described.
    Example 1
    Particle size 3-1㎜ Electrolytic magnesia clinker, 1 type 10wt%, Particle size 1mm or less, Electrolytic magnesia clinker, Class 1 13wt%, Particle size 3-1mm Electrolytic magnesia clinker, Class 2 10wt%, Particle size 3-1㎜ Electrolysis magnesia clinker 2 kinds 15wt%, particle size 1mm or less 2 molten magnesia clinker 5wt%, particle size 3-1mm purity 98% sintered magnesia clinker 10wt%, fine grain 98% sintered magnesia clinker 13wt%, graphite 98% purity Furnace tap characterized in that it consists of a binder consisting of a binder consisting of a binder of phenolic resins of 4.5wt%, 100wt% of the raw material consisting of 7wt% of silicon carbide, 3wt% of aluminum, 2wt% of magnesium / aluminum alloy Magnesia-carbon brick for halls.
    Example 2
    Particle size 3-1㎜ Electrolytic magnesia clinker, 1 type 10wt%, Particle size 1mm or less 1 molten magnesia clinker, Class 15wt%, Particle size 3-1mm 2 molten magnesia clinker, 10 wt% 2 kinds 15wt%, particle size 1mm or less Dedicated magnesia clinker 2 kinds 5wt% Particle size 3-1mm Purity 98% Sintered magnesia clinker 10wt%, Fineness of 98% Sintered magnesia clinker 15wt%, Graphite 13wt of 98wt% purity %, 100wt% of raw material consisting of 7wt% of hydrocarbon, 3wt% of aluminum, 2wt% of magnesium / aluminum alloy, 1wt% of special carbon powder, and binder comprising 4.5wt% of binder phenolic resin. Magnesia-carbon bricks for electric tapholes.
    Comparative example
    Particle size 3-1㎜ electrolytic magnesia clinker 20 kinds, 1 kind below particle size 1mm or less Magnesia clinker 1 class 30wt%, particle size 3-1㎜ Electrode magnesia clinker 2 kinds 18wt%, magnesia clinker with 99% fineness 15 wt%, 100 wt% of a raw material consisting of 17 wt% of graphite with a purity of 99%, an antioxidant consisting of 3 wt% of aluminum and 2 wt% of a magnesium / aluminum alloy, and a binder consisting of 4.5 wt% of a binder phenolic resin. Magnesia-carbon bricks for electric tapholes.
    Figure 1 shows the room temperature and hot bending strength of each of the above examples and comparative examples, compared with the comparative example the embodiment showed a high temperature and hot bending strength, in particular, Example 2 showed a high strength characteristics. It is estimated that the increase in the room temperature bending strength is due to the increase in the fine powder portion and the decrease in the carbon content, but in the hot period, the increase of the magnesia-aluminum oxide and the magnesia-alumina products, which are reaction products by adding 7% silicon carbide in addition to the existing aluminum and magnesium / aluminum alloy Hot strength is increased.
    Figure 2 shows the oxidation index represented by the difference between the weight loss rate and the decarburization rate after the first and second oxidation tests, the embodiment shows a significantly higher oxidation index than the comparative example, wherein the higher the oxidation index is low. In particular, the higher oxidation resistance of Example 2 than that of Example 1 is due to the reduction of the decarburization area and the increase of the reaction product due to the reduction of graphite content in the matrix of the brick.
    Development of magnesia-carbon bricks for electric furnace tapholes As described above, Examples 1 and 2 have a general decrease in general physical properties compared to the current comparative examples, but excellent thermal properties that influence quality characteristics, thermoelectric strength and corrosion resistance. Oxidation resistance is improved by 20-30% compared to the current product.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] 100 wt% of sintered and molten magnesia clinker with purity over 98%, 83-87wt% of molten graphite, 13-17wt% of impression graphite, 6-8wt% of silicon carbide, 2-4wt% of aluminum, 1-3wt% of magnesium / aluminum alloy Magnesia-carbon brick for electric furnace tap hole, characterized in that consisting of an antioxidant and a binder consisting of 4-5wt% phenolic resins.
    [2" claim-type="Currently amended] The magnesia-carbon brick for an electric furnace tap hole according to claim 1, wherein 0.5-2 wt% of special carbon powder is added.
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    同族专利:
    公开号 | 公开日
    KR100203461B1|1999-06-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-24|Application filed by 서상기, 포철로재 주식회사
    1996-12-24|Priority to KR1019960071583A
    1998-09-25|Publication of KR19980052568A
    1999-06-15|Application granted
    1999-06-15|Publication of KR100203461B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960071583A|KR100203461B1|1996-12-24|1996-12-24|Magnesia-carbon a brick|
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