KR890000263B1 - Process for sintering iron - Google Patents
Process for sintering iron Download PDFInfo
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- KR890000263B1 KR890000263B1 KR1019850006821A KR850006821A KR890000263B1 KR 890000263 B1 KR890000263 B1 KR 890000263B1 KR 1019850006821 A KR1019850006821 A KR 1019850006821A KR 850006821 A KR850006821 A KR 850006821A KR 890000263 B1 KR890000263 B1 KR 890000263B1
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- sawdust
- sintered
- raw material
- sintering
- sintered ore
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
제1도는 톱밥 첨가량에 따른 소결시간과 생산율의 관계.1 is a relationship between the sintering time and the production rate according to the amount of sawdust added.
제2도는 톱밥 첨가량에 따른 냉간강도와 회수율의 관계.2 is the relationship between the cold strength and the recovery rate according to the amount of sawdust added.
제3도는 톱밥 첨가량에 따른 소결장입물의 통기도 변화.3 is a change in air permeability of the sintered charge according to the amount of sawdust added.
제4도는 톱밥 첨가량에 따른 환원율의 변화.4 is a change in the reduction rate according to the amount of sawdust added.
본 발명은 철강석 소결광의 제조방법에 관한 것으로서 그 목적은 소결광의 냉간강도의 증대와 소결시간을 단축시켜 소결광품질 및 생산율을 향상시키기 위한 것이다. 고로 원료로서의 소결광 제조공정은 일반적으로 이동하는 대차위에 분광석, 반광, 석회석 및 수분등을 혼합한 소결원료를 층상으로 장입해서 원료중의 코크스를 표면에서 점화시키고, 소결원료층 하방에서 공기를 강제흡입하여 원료층중으로 통기시켜, 소결원료층 표면에서 저면으로 소성시킨후, 배광부에서 대차를 회전시키면서 괴상의 신터케이크(SINTER CAKE)를 배출하고 파쇄 및 냉각하여 소결광을 얻고 있다. 소결광 제조공정에서는 소결기 하방에서 공기를 흡입하기 때문에 소결원료층내의 공극(VOID)이 다량존재하며 그 공극을 통하여 많은 공기가 흡입되고, 그 공기는 원료층중의 코크스 연소공기로서 또 한편으로는 원료층중 연소부의 열을 하층부로 전달하는 매체로서 이용되기 때문에 소결품질이 악화되지 않는 범위내에서는 다량의 공기공급이 필요하다.The present invention relates to a method for producing a steel sintered ore, the purpose of which is to increase the cold strength of the sintered ore and shorten the sintering time to improve the quality and production rate of the sintered ore. In the sintered ore manufacturing process as a blast furnace raw material, generally, a sintered raw material mixed with spectroscopy, semi-ore, limestone, and moisture is charged in a layered manner to ignite the coke in the raw material, and forcibly presses air below the sintered raw material layer. After suctioning and aeration into the raw material layer, and firing from the surface of the sintered raw material layer to the bottom surface, the sintered ore is discharged, crushed and cooled while rotating the bogie in the light distribution unit to obtain a sintered ore. In the sintered ore manufacturing process, air is sucked under the sintering machine, so a large amount of voids (VOID) in the sintered raw material layer exist, and a lot of air is sucked through the voids, and the air is used as coke combustion air in the raw material layer. Since it is used as a medium for transferring the heat of the combustion part to the lower part of the raw material layer, a large amount of air supply is required within the range where the sintering quality is not deteriorated.
그러나 소결원료층의 통기성이 양호하여 공기의 유입의 과다할 경우는 소결시간의 단축으로 소결광의 생산율은 증가하나 코크스의 불완전연소로 인하여 소결원료의 조립물을 결합시키는 용액량의 감소현상이 나타나 소결성품중 냉간강도가 악화되는 것이 종래 소결광 제조방법의 일반적인 문제점이다.However, if the air flow of the sintered raw material layer is good and excessive inflow of air, the production rate of sintered ore increases due to shortening of the sintering time, but due to the incomplete combustion of coke, the amount of solution that binds the granulated material of the sintered raw material is decreased. Deterioration of cold strength in the nature is a general problem of the conventional sintered ore manufacturing method.
본 발명은 이와같은 문제점을 해결하기 위하여 소결광원료의 가연성물질(톱밥 또는 왕겨)을 첨가함으로서 소결시간을 단축시켜 생산율의 증대소결성품의 냉간강도 및 환원율을 향상시킨 것이다. 이하 본 발명에 대하여 상세히 설명한다.The present invention is to improve the cold strength and the reduction rate of the sintered product by increasing the production rate by shortening the sintering time by adding a combustible material (sawdust or rice husk) of the sintered ore raw material to solve this problem. Hereinafter, the present invention will be described in detail.
제1도는 표1의 원료배합비와 표2의 물성치를 갖는 톱밥의 첨가량에 따른 소결시간 및 생산율에 대한 관계를 나타낸 것이다. 톱밥을 0.4중량 %까지 첨가할 경우는 혼합 및 조립시 첨가물이 전량 부착입자로서 기여하여 제3도와 같이 통기성의 영향을 주지 않는다. 이 부착된 톱밥이 연소한 후 소결층내의 공극으로 존재하기 때문에 소결시간이 짧아졌고 이에 따라 생산율이 증대되었다. 또한 톱밥이 코크스보다 빨리 연소하기 때문에 고온 체류시간이 짧아짐에 따라 조립물중의 부착입자인 미분철광석을 용해 및 응고 시킴에 따라 통기를 악화시키지 않고 조립물을 강력하게 급격히 결합시킬 수 있는 용액량이 형성되기 때문에 소결시간이 단축되면서 냉간강도가 향상됨을 제2도에 나타내었다. 그러나 톱밥을 0.4중량 %이상 첨가할 경우는 조립물을 형성하고, 잔량의 톱밥의 공극을 폐쇄하기 때문에 제3도와 같이 통기성의 악화를 초래하여 소결시간이 길어졌고 생산율이 감소하였다. 그리고 톱밥의 증가에 따라 조립되지 않은 잔량의 톱밥이 조립물 사이에 존재하여 장입원료의 부피팽창을 초래하게된다.Figure 1 shows the relationship between the sintering time and the production rate according to the addition amount of the raw material mixture of Table 1 and the sawdust having the physical properties of Table 2. When sawdust is added up to 0.4% by weight, the additives contribute to the total amount of attached particles during mixing and granulation, and thus do not affect the air permeability as shown in FIG. Since the adhered sawdust burned out and was present as a void in the sintered layer, the sintering time was shortened, thereby increasing the production rate. In addition, as sawdust burns faster than coke, as the high temperature residence time is shortened, the amount of solution that can bond the granules strongly and rapidly without deteriorating aeration is formed by dissolving and solidifying fine iron ore, which is adhered particles in the granules. As shown in FIG. 2, the cold strength is improved while the sintering time is shortened. However, when 0.4% by weight or more of sawdust is added, granules are formed and the remaining amount of sawdust is closed, resulting in deterioration of air permeability as shown in FIG. 3, resulting in a long sintering time and a decrease in production rate. As the sawdust increases, the remaining amount of unassembled sawdust is present between the granules, resulting in volume expansion of the charged raw materials.
따라서 장입량을 일정하게 하기 위하여 부피팽창만큼 압장입을 하여야 하기 때문에 통기성이 저해되고 소결시간이 증가하였다. 또한 소결원료의 조립물 주위에 과다하게 톱밥이 존재하기 때문에 연소후 큰 공극이 형성되어 물리적인 취약성이 나타나 냉간강도와 회수율이 저하되는 것을 제2도에 나타냈다. 따라서 본 발명은 소결원료의 혼합시 0.4중량 %까지 가연성물질(톱밥 또는 왕겨)을 첨가하여 소결한 시료를 환원시험해서 환원 후 무게감량의 변화를 조사하였으나 제4도에서 보는 바와같이 변화가 거의 없었다. 그러나 소결광의 생산율은 최대 11% 향상시킬 수 있는 효과가 있었다.Therefore, in order to make the charge constant, pressurization should be performed as much as volume expansion, and air permeability is inhibited and sintering time is increased. In addition, since sawdust exists excessively around the granulated material of the sintered raw material, large voids are formed after combustion, resulting in physical fragility, and the cold strength and recovery are shown in FIG. 2. Therefore, the present invention investigated the change in weight loss after reduction by reducing the sample sintered by adding combustible material (sawdust or rice hull) to 0.4% by weight when mixing the sintered raw material, but little change as shown in FIG. . However, the production rate of sintered ore was able to improve up to 11%.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019850006821A KR890000263B1 (en) | 1985-09-18 | 1985-09-18 | Process for sintering iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019850006821A KR890000263B1 (en) | 1985-09-18 | 1985-09-18 | Process for sintering iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870003214A KR870003214A (en) | 1987-04-16 |
| KR890000263B1 true KR890000263B1 (en) | 1989-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019850006821A KR890000263B1 (en) | 1985-09-18 | 1985-09-18 | Process for sintering iron |
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| Country | Link |
|---|---|
| KR (1) | KR890000263B1 (en) |
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1985
- 1985-09-18 KR KR1019850006821A patent/KR890000263B1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR870003214A (en) | 1987-04-16 |
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