KR100325117B1 - Method for preventing erosion of bricks in bottom of blast furnace - Google Patents

Method for preventing erosion of bricks in bottom of blast furnace Download PDF

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KR100325117B1
KR100325117B1 KR1019970075864A KR19970075864A KR100325117B1 KR 100325117 B1 KR100325117 B1 KR 100325117B1 KR 1019970075864 A KR1019970075864 A KR 1019970075864A KR 19970075864 A KR19970075864 A KR 19970075864A KR 100325117 B1 KR100325117 B1 KR 100325117B1
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South Korea
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blast furnace
mud material
furnace
high strength
bricks
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KR1019970075864A
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Korean (ko)
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KR19990055891A (en
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김병진
김재식
한기원
이상호
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이구택
포항종합제철 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/12—Shells or casings; Supports therefor
    • F27B1/14—Arrangements of linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D2001/1605—Repairing linings
    • F27D2001/1615—Repairing linings through a hole in the casing, e.g. injecting refractory from outside the vessel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

PURPOSE: A method for preventing erosion of bricks in the bottom of a blast furnace by forming the protection wall on the furnace bottom bricks inside the blast furnace and on the inner circumferential surface of the tap hole through tap hole in the state that pressure in the furnace is 100 g/cm¬2 or less, and level of hot metal and slag is zero. CONSTITUTION: The method for preventing erosion of bricks in the bottom of a blast furnace comprises the steps of filling a high strength mud material(12-1) into tap hole(11) and furnace using a mud gun(91) at a time point when molten materials(41,51) in the furnace having internal wind pressure of 100 g/cm¬2 or less are completely discharged after completing air blowing stoppage of the blast furnace; forming an axis directional cavity in the high strength mud material(12-1) that is filled and baked in the tap hole(11); and filling a general mud material into the cavity of the high strength mud material(12-1) using the mud gun(91), wherein the high strength mud material(12-1) filled into the blast furnace forms a protection wall(1) along bricks(71,81), the high strength mud material(12-1) comprises 10 wt.% or more of Al2O3, 72 to 78 wt.% of SiC+C and 3 to 4 wt.% of Si3N4, and one cycle filling quantity of the high strength mud material(12-1) is 500 to 600 kg.

Description

고로의 로저연와 침식방지방법Roger smoke and erosion prevention method of blast furnace

본 발명은 고로의 로저연와 침식방지방법에 관한 것으로, 특히 고로의 휴풍시 로내압력이 100g/㎠이하이면서 용선과 슬래그레벨이 0인상태에서 출선구를 통해 고로의 내측 로저연와와 출선구의 내주면에 고강도머드재로 보호벽을 형성하는 고로의 로저연와 침식방지방법에 관한 것이다.The present invention relates to a method for preventing the erosion of the edge of the blast furnace, in particular, the inner circumferential surface of the inner gyro of the blast furnace through the exit port in the state of the molten iron and slag level is 0 while the inner pressure of the furnace is less than 100g / ㎠ The present invention relates to a furnace edge and erosion prevention method of a blast furnace for forming a protective wall with a high strength mud material.

일반적으로 고로조업의 경과에 따라 고로화입개시 후, 2년이 경과되는 시점부터 도1에 도시한 바와같이 고로(10)의 내측벽 하부연와(71,81)는 연속적으로 고로의 하부에 고여있는 용선(61)과 슬래그(51)의 유동에 의한 연와의 침식 및 마모현상이 발생된다.In general, as the blast furnace operation starts, after two years have passed, as shown in FIG. 1, lower edges (71, 81) of the inner wall of the blast furnace (10) continuously accumulate at the bottom of the blast furnace. Erosion and wear phenomenon of the lead due to the flow of the molten iron 61 and the slag 51 is generated.

그리고 고로(10)의 원주방향으로 형성되는 4개의 출선구(11)는 일일 10여회 반복되는 개공작업에 의해 내주면을 형성하고 있는 연와의 마모 및 침식이 지속적으로 진행된다.In addition, the four outlets 11 formed in the circumferential direction of the blast furnace 10 are continuously worn and eroded by the kite which forms the inner circumferential surface by the opening work repeated 10 times a day.

따라서 고로(10)의 내부연와(71,81) 침식을 그대로 방치할 경우 연와침식선(21)이 형성되어 로수명단축이라는 막대한 문제가 발생된다.Therefore, when the inner edge of the blast furnace 10 erosion (71, 81) is left as it is, the duct erosion line 21 is formed, causing a huge problem of shortening the life of the furnace.

이러한 고로(10)의 내부연와(71,81) 침식을 방지하기 위하여 종래에는 열풍제어변(10-1)으로 출선구(11)의 상부측에 위치한 풍구(10-3)의 열풍량을 줄임으로써 출선구의 내측 연와에 용융 낙하되는 용선(61) 및 슬래그(51) 양을 줄이는 방법을 사용하였다.In order to prevent the erosion of the internal edges 71 and 81 of the blast furnace 10, conventionally, the amount of hot air of the tuyere 10-3 located on the upper side of the outlet 11 is reduced to the hot air control valve 10-1. As a result, a method of reducing the amount of molten iron 61 and slag 51 melted and dropped on the inner edge of the exit port was used.

그러나 이러한 방법은 대형고로에 원주방향별로 통상 34개가 설치되는 풍구(10-3)의 열풍량 차이를 유발하기 때문에 원주방향으로 로황의 차이가 발생되어 전체 로황이 불안정하게 된다.However, this method causes a difference in the amount of hot air in the blast furnace 10-3, in which 34 pieces are usually installed in the circumferential direction in the large blast furnace, so that a difference in the furnace sulfur occurs in the circumferential direction, resulting in unstable overall furnace sulfur.

또한 종래에는 출선구(11)를 폐쇄하고 출선구의 내부보호벽을 형성하는 머드재 충전량을 증가시키거나, 머드재에 산화티타늄(TiO2)을 일정비율로 혼합하여 출선구에 충전하는 방법을 사용하였다.In addition, in the related art, a method of filling the exit port by increasing the amount of mud material filling the exit port 11 and forming the inner protective wall of the exit port, or mixing titanium oxide (TiO 2 ) at a predetermined ratio in the mud material. It was.

그러나 이 방법은 고로(10) 하부에 정상조업시의 압력이 4.0㎏/㎠이 항상 걸려있고, 비중 7.6의 용선과 비중 2.3의 슬래그가 존재하고 있는 상태에서 이루어지기 때문에 상대적으로 비중이 가볍고 재질상 출선구의 하부로의 접착특성이 강하지 않기 때문에 근본적인 해결방법이 되지 못하였다.However, this method is relatively light in weight and material because the pressure in the normal operation is always under 4.0kg / cm2 under the blast furnace 10, and the molten iron with a specific gravity of 7.6 and slag with a specific gravity of 2.3 are present. Since the adhesive property to the bottom of the exit port is not strong, it was not a fundamental solution.

본 발명은 고로의 휴풍시 로내압력이 100g/㎠이하이면서 용선과 슬래그레벨이 0인상태에서 출선구를 통해 고로의 내측 로저연와와 출선구의 내주면에 고강도머드재로 보호벽을 형성하는 고로의 로저연와 침식방지방법을 제공함에 그 목적이 있다.In the present invention, when the blast furnace is idle, the furnace pressure is 100g / ㎠ or less and the molten iron and slag level is 0, and the blast furnace's logger is provided with a high strength mud material on the inner circumferential surface of the blast furnace and the inner circumferential surface of the exit port. Its purpose is to provide methods for preventing lead and erosion.

도1은 종래의 고로 로저부 침식상태를 나타내는 개략도,1 is a schematic diagram showing a blast furnace erosion state of the related art;

도2는 종래의 고로 로저부 침식방지방법을 나타내는 개략도,Figure 2 is a schematic diagram showing a conventional blast furnace erosion prevention method,

도3은 본 발명에 따른 고로의 로저연와 침식방지방법을 나타내는 개략도이다.Figure 3 is a schematic diagram showing the Roger smoke and erosion prevention method of the blast furnace according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1: 보호벽 10: 고로 10-1: 열풍공급관 10-2: 열풍변 10-3: 풍구 10-4: 환상관 11: 출선구 12-1: 고강도머드재 12-2: 일반머드재 21: 연와침식선 31: 스탬프재 41: 로심코크스 51: 슬래그 61: 용선 71: 출선구 하부연와 81: 로저부연와 91: 머드건DESCRIPTION OF SYMBOLS 1: Protective wall 10: Blast furnace 10-1: Hot air supply pipe 10-2: Hot air side 10-3: Fenggu 10-4: Annular pipe 11: Outlet 12-1: High strength mud material 12-2: General mud material 21: Yeonwa Erosion line 31: Stamping material 41: Losim coke 51: Slag 61: Charter 71: Exit lower edge and 81: Roger buyeon and 91: Mud gun

상기한 목적을 달성하기 위하여 본 발명은 고로의 휴풍이 완료된 후, 상기 고로내의 풍압이 100g/㎠이하가 되는 로내의 용융물 완전배출시점에 고강도머드재를 머드건을 이용하여 출선구 및 로내로 충전하는 단계와; 상기 출선구내에 충전 소성된 상기 고강도머드재에 축방향의 중공을 형성하는 단계와; 상기 고강도머드재의 중공에 머드건을 이용하여 일반머드재를 충전하는 단계로 구성되는 것을 특징으로 하는 고로의 로저연와 침식방지방법을 제공한다.In order to achieve the above object, the present invention, after the completion of the blast furnace blast furnace, the high pressure mud material is filled into the exit port and the furnace using the mud gun at the time of complete discharge of the melt in the furnace, the wind pressure in the blast furnace is less than 100g / ㎠ Making a step; Forming an axial hollow in the high strength mud material filled and fired in the tap hole; It provides a furnace edge and erosion prevention method of the blast furnace, characterized in that consisting of the step of filling the general mud material using a mud gun in the hollow of the high-strength mud material.

도면을 참조하여 본 발명의 구성을 설명한다.The configuration of the present invention will be described with reference to the drawings.

도3은 본 발명에 따른 고로의 로저연와 침식방지방법을 나타내는 개략도이다.Figure 3 is a schematic diagram showing the Roger smoke and erosion prevention method of the blast furnace according to the present invention.

출선구(11)의 상부에 설치된 풍구(10-3)를 통해 고온의 열풍을 고로(10)에 불어 넣어 코크스를 연소시키면 열원 및 환원가스가 발생되고, 이 열원 및 환원가스에 의해 괴상대 즉, 용광로 내부에서 철광석 및 코크스가 용융되지 않는 상태로 존재하는 영역에 있는 철광석은 로하부로 강하하는 과정에서 환원되고 연화 융착되어 최종적으로 연화융착대(Cohesive Zone: 광석의 연화개시부터 용융이 완료되는 시점까지의 온도분포곡선) 이하인 로저부에 용융물이 존재하게 된다.When the coke is combusted by blowing high temperature hot air into the blast furnace 10 through the air vent 10-3 installed at the upper part of the outlet 11, a heat source and a reducing gas are generated. Iron ore in the area where iron ore and coke are not melted in the furnace is reduced and softly fused in the process of descending to the lower part, and finally, softening fusion zone (Cohesive Zone) is the time when melting is completed from the start of softening of the ore. The melt is present in the bottom of the furnace (temperature distribution curve up to).

그리고 고로(10)조업개시 후, 1개월이 지나 정상조업도가 달성되면 출선구(11)의 측벽부에 상하로 부착된 스탬프재(31)는 대부분 소멸되고, 약 1800mm의 내화연와만 남은상태에서 출선조업을 개시하게 된다.After the operation of the blast furnace 10 is started, if normal operation is achieved after one month, the stamping material 31 attached to the side wall of the outlet 11 is almost extinguished, and remains with only 1800 mm of fire-resistant smoke. Starting operations will be started.

이때 고로(10)의 하부에 존재하는 용선(61) 및 슬래그(51)는 4개의 출선구(11)에서 교대로 실시되는 출선작업에 의하여 약 120분 간격으로 33。,147。,213。,327。의 4방향으로 용융물 배출이 집중적으로 이루어지게 되고, 이로 인하여 고로의 용선과 슬래그 유동이 극심하게 일어나게 되어 출선구의 내측 하부연와의 침식 및 마모가 촉진된다.At this time, the molten iron 61 and the slag 51 existing in the lower part of the blast furnace 10 are 33 °, 147 °, 213 ° at intervals of about 120 minutes by alternate work performed at four exit ports 11. Melt discharge is concentrated in four directions of 327 °, and the molten iron and slag flow of the blast furnace is severely generated, which promotes erosion and wear of the inner lower edge of the exit port.

또한 고로(10) 하부에 존재하는 용선(61) 및 슬래그(51)가 연와와 화학반응을 일으켜 연와의 침식을 가속화시키고, 미세틈사이로 가스통로가 형성되어 국부적인 연와침식 및 탈락현상이 일어나 출선구(11)의 하부 측벽온도의 상승을 초래하게 된다.In addition, the molten iron 61 and the slag 51 present in the lower part of the blast furnace 10 may cause chemical reactions with the lead, thereby accelerating the erosion of the lead, and a gas passage is formed between the micro cracks, causing local lead erosion and dropping out. The lower side wall temperature of the precursor 11 is caused to rise.

따라서 본 발명에서는 출선구(11) 바로 500mm 아래에서부터 밑바닥에 걸쳐서 정상조업시 항상 고여있는 용선(61)에 의한 화학적 침식, 용선유동에 의한 마모가 극심하게 발생되는 내측연와에 고강도머드재(12-1)를 충전하여 보호벽을 형성시켰다.Therefore, in the present invention, the high strength mud material (12- 12) is formed on the inner edge where chemical erosion by the molten iron (61), which is always standing during normal operation from just below 500 mm from the outlet (11), and abrasion due to the molten iron flow are extremely generated. 1) was charged to form a protective wall.

이때 출선구(11)의 하부측에 존재하는 고로(10)의 용선(61) 및 슬래그(51)의 거동과 흐름을 고려한 결과 8주마다 실시하는 고로 휴풍시 또는 설비 및 고로조업안정을 위한 임시 휴풍시 고로하부의 용선 및 슬래그를 완전 배출한 후, 출선구(11)를 통해 고강도머드재(12-1)를 고로의 저부에 충전한 후, 다시 출선구내에 충전하였다.At this time, considering the behavior and flow of the molten iron 61 and the slag 51 of the blast furnace 10 existing on the lower side of the exit port 11, the temporary blast furnace for every eight weeks or for stabilization of equipment and blast furnace operation After completely discharging the molten iron and slag at the bottom of the blast furnace, the high-strength mud material 12-1 was filled in the bottom of the blast furnace through the outlet 11, and then again in the outlet.

여기서 출선구(11)를 통한 고장도머드재(12-1)를 충전하는 방법을 더욱 상세히 설명하면 다음과 같다.Here will be described in more detail how to charge the fault dome material 12-1 through the outlet 11 as follows.

먼저 고로(10)의 휴풍을 완료한 후, 고로내부의 풍압이 100g/㎠이하인 로내의 용융물 완전배출시점에서 1차로 고강도머드재(12-1) 600㎏을 머드건(91)내에 충전한 다음, 유동성확보를 위하여 고강도머드재(12-1)를 110℃까지 예열한다.First, after the shelter of the blast furnace 10 is completed, 600 kg of the high-strength mud material (12-1) is first filled into the mud gun 91 at the time of complete discharge of the melt in the furnace of which the wind pressure inside the blast furnace is 100 g / cm 2 or less. Preheat the high-strength mud material 12-1 to 110 ° C to ensure fluidity.

여기서 고강도머드재(12-1)의 충전량을 600㎏으로 한정한 이유는 출선구(11)의 내경과 깊이, 로(10)내의 연와 최대침식부의 단면적을 고려하여 설정된 량이다.The reason for limiting the filling amount of the high-strength mud material 12-1 to 600 kg is set in consideration of the inner diameter and depth of the tap hole 11, the cross section area of the lead and the largest erosion portion in the furnace 10.

그리고 예열된 600㎏의 고강도머드재(12-1)를 머드건(91)을 작동시켜 출선구(11)를 통해 충전시키면, 고강도머드재는 출선구내에 충전되는 동시에 출선구내에서 빠져나와 로(10)내부의 로심코크스층(41) 사이에서 로중심부로 밀려들어가지 않고 연와침식부인 고온(2500℃)의 측벽부을 원주방향으로 도포하게 된다.And when the preheated 600kg high-strength mud material (12-1) by operating the mud gun 91 to charge through the outlet 11, the high-strength mud material is filled in the outlet and at the same time exit the outlet (10) The high temperature (2500 ° C.) sidewall portion, which is a soft erosion portion, is applied in the circumferential direction without being pushed into the center of the furnace between the internal low core coke layers 41.

이때 로(10)내의 측벽부를 원주방향으로 도포된 고강도머드재(12-1)는 점차 하부로 이동하여 출선구(11)의 하부측벽과 고로바닥에 위치하는 연와(17,81)에 안착, 소성되면서 보호벽(1)을 형성하게 된다.At this time, the high-strength mud material 12-1 coated in the circumferential direction of the side wall portion in the furnace 10 gradually moves downward to be seated on the edge 17 and 81 located at the bottom side wall of the exit port 11 and the bottom of the blast furnace. While firing, the protective wall 1 is formed.

여기서 고강도머드재(12-1)에 의한 보호벽(1)은 충전 60분 후, 함유된 타르성분이 증발되면서 완전히 소성되고, 이로써 고로(10)의 휴풍 후, 15∼20시간이 지나서 고로에 바람을 넣어 용선을 다시 생산하여도 출선구(11) 하부의 연와(71)와 용선(61)의 직접적인 접촉을 차단함으로써 연와의 마모 및 침식을 방지하게 된다.Here, the protective wall 1 by the high-strength mud material 12-1 is completely fired after 60 minutes of filling, while the tar component contained is evaporated. Thus, after a shelter of the blast furnace 10, the wind is blown to the blast furnace after 15 to 20 hours. Even if the production of the molten iron again to block the direct contact between the lead 71 and the molten iron 61 of the outlet opening 11 to prevent wear and erosion of the lead.

또한 머드건(91)내에 충전된 고강도머드재(12-1)가 출선구(11)에 완전히 충전되면 머드건(91)을 출선구의 입구로부터 후퇴시키고, 출선구내부에 소성된 머드재를 굴착하는 개공기(미도시)에 드릴비트를 장착하여 이 드릴비트의 타격 및 회전운동에 의해 출선구내의 고강도머드재에 축방향으로 중공을 형성하게 된다.In addition, when the high-strength mud material 12-1 filled in the mud gun 91 is completely filled in the exit port 11, the mud gun 91 is withdrawn from the entrance of the exit port, and the mud material fired in the exit port is removed. A drill bit is mounted on an excavation opening machine (not shown) to form a hollow in the axial direction in the high-strength mud material in the tap hole by the impact and rotational movement of the drill bit.

그리고 더시 머드건(91)에 일반머드재(12-2) 200㎏을 충전한 후, 이를 가공된 중공에 충전하게 된다.And after filling the 200 kg of the general mud material (12-2) to the mud mud gun 91, it is filled into the processed hollow.

표1Table 1

화학성분Chemical composition 곡강도(㎏/㎠)1350℃×3HrFlexural Strength (㎏ / ㎠) 1350 ℃ × 3Hr 압축강도(㎏/㎠)1350℃×3HrCompressive Strength (㎏ / ㎠) 1350 ℃ × 3Hr 열간강도(㎏/㎠)1400℃×3HrHot strength (㎏ / ㎠) 1400 ℃ × 3Hr Al2O3 Al 2 O 3 SiC+CSiC + C SiO2 SiO 2 Si3N4 Si 3 N 4 일반머드재General Mud Material 10≤10≤ 33≤33≤ 45≥45≥ 1818 55∼6655-66 60≤60≤ 12≤12≤ 고강도머드재High Strength Mud Material 10≤10≤ 72∼8772-87 -- 3∼43 to 4 150≤150≤ 200≤200≤ 90≤90≤

상기 표1에 나타낸 바와같이 고강도머드재는 일반머드재에 비하여 곡강도, 압축강도, 열간강도에 있어서, 월등히 우수하여 고온상태에서 연와(71,81)의 보호벽 역할을 완벽하게 수행할 수 있게 된다.As shown in Table 1, the high-strength mud material is excellent in bending strength, compressive strength, and hot strength as compared to the general mud material, so that the high-temperature mud material can perform a role of a protective wall of the ducts 71 and 81 at high temperature.

본 발명은 고로의 휴풍시 로내압력이 100g/㎠이하이면서 용선과 슬래그레벨이 0인상태에서 출선구를 통해 고로의 내측 로저연와와 출선구의 내주면에 고강도머드재로 보호벽을 형성함으로써 출선구의 하부연와를 보호하고, 이로써 고로의 생산성을 향상시키면서 수명을 연장시키는 효과를 제공한다.According to the present invention, the inner wall of the furnace and the inner circumferential surface of the blast furnace are formed with a high-strength mud material through the tapping hole while the inner pressure of the blast furnace is 100g / cm 2 or less and the molten iron and slag level is 0. It protects the lower smoke, thereby improving the productivity of the blast furnace and providing the effect of prolonging its life.

Claims (4)

고로(10)의 휴풍이 완료된 후, 상기 고로(10)내의 풍압이 100g/㎠이하가 되는 로내의 용융물(41,51) 완전배출시점에 고강도머드재(12-1)를 머드건(91)을 이용하여 출선구(11) 및 로(10)내로 충전하는 단계와;After the shelter 10 of the blast furnace 10 is completed, the mud gun 91 is a high-strength mud material 12-1 at the time of complete discharge of the melts 41 and 51 in the furnace where the wind pressure in the blast furnace 10 becomes 100 g / cm 2 or less. Filling into the outlet 11 and the furnace 10 by using; 상기 출선구(11)내에 충전 소성된 상기 고강도머드재(12-1)에 축방향의 중공을 형성하는 단계와;Forming an axial hollow in the high strength mud material (12-1) filled and fired in the outlet opening (11); 상기 고강도머드재(12-1)의 중공에 머드건(91)을 이용하여 일반머드재(12-2)를 충전하는 단계로 구성되는 것을 특징으로 하는 고로의 로저연와 침식방지방법.Roger smoke and erosion prevention method of the blast furnace, characterized in that consisting of the step of filling the general mud material (12-2) using a mud gun (91) in the hollow of the high-strength mud material (12-1). 제 1 항에 있어서,The method of claim 1, 상기 고로(10)내로 충전되는 상기 고강도머드재(12-1)는 연와(71,81)를 따라 보호벽(1)을 형성하는 것을 특징으로 하는 고로의 로저연와 침식방지방법.The high strength mud material 12-1 filled into the blast furnace 10 forms a protective wall 1 along the edges 71 and 81 of the furnace edge and erosion prevention method of the blast furnace. 제 1 항에 있어서,The method of claim 1, 상기 고강도머드재(12-1)는 중량%로 Al2O310%이상, SiC+C 72∼87%, Si3N43∼4%로 이루어진 것을 특징으로 하는 고로의 로저연와 침식방지방법.The high strength mud material (12-1) by weight% Al 2 O 3 10% or more, SiC + C 72 ~ 87%, Si 3 N 4 3-4% Roger smoke and erosion prevention method of the blast furnace, characterized in that . 제 1 항에 있어서,The method of claim 1, 상기 고강도머드재(12-1)의 1회 충전량은 500 ∼600㎏으로 하는 것을 특징으로 하는 고로의 로저연와 침식방지방법.Roger fillet and erosion prevention method of the blast furnace, characterized in that the one-time filling amount of the high-strength mud material (12-1) is 500 to 600 kg.
KR1019970075864A 1997-12-29 1997-12-29 Method for preventing erosion of bricks in bottom of blast furnace KR100325117B1 (en)

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