KR20030052345A - Ironmaking process with briquetting facility using fine iron and sludge - Google Patents
Ironmaking process with briquetting facility using fine iron and sludge Download PDFInfo
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- KR20030052345A KR20030052345A KR1020010082231A KR20010082231A KR20030052345A KR 20030052345 A KR20030052345 A KR 20030052345A KR 1020010082231 A KR1020010082231 A KR 1020010082231A KR 20010082231 A KR20010082231 A KR 20010082231A KR 20030052345 A KR20030052345 A KR 20030052345A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P10/00—Technologies related to metal processing
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Abstract
본 발명은 환원된 분환원철을 고온에서 단광(briquette)으로 괴성화하여 용융로로 장입하여 용선을 생산하는 용융환원제철방법에 관한 것으로, 그 목적은 유동환원공정, 단광제조공정에서 발생하는 분진을 슬러지로 농축하여 재활용함으로써 공정의 생산성을 높이고 연료사용량을 줄이기 위한 용선제조방법을 제공함에 있다.The present invention relates to a molten iron reduction method for producing molten iron by compacting reduced reduced iron into briquettes at a high temperature and charging it into a melting furnace, and an object thereof is sludge dust generated in a fluid reduction process and briquette manufacturing process. It is to provide a molten iron manufacturing method to increase the productivity of the process and reduce the fuel consumption by concentrating and recycling.
상기 목적을 달성하기 위한 본 발명은, 입도분포가 넓은 분철광석과 부원료를 유동환원시키는 1단 또는 2단 이상의 반응기로 구성된 유동층환원로(200), 상기 유동층환원로에서 환원되어 배출되는 분환원철과 부원료를 단광으로 제조하는 괴성화기(310), 상기 괴성화기에서 괴성화된 다열의 단광을 개개의 단광으로 분리하는 분리기(320), 상기 분리기에서 분리된 단광을 용융시켜 용선을 생산하는 용융로(500), 상기 용융로에서 발생하는 배가스를 포집하여 더스트는 용융로에 재공급하고 가스는 유동층환원로의 환원가스로 공급하는 용융로 사이클론(510)를 포함하고, 상기 용융로 사이클론(510)과 유동층환원로(200)는 환원가스공급관(511)을 통해 환원가스 소통관계로 연결되고, 상기 용융로(500)와 용융로 사이클론(510)은 더스트순환관(502)을 통해 더스트 소통관계로 연결되어 구성되는 유동층식 용융환원제철설비에서의 용선제조방법에 있어서,The present invention for achieving the above object is a fluidized bed reduction reactor 200 consisting of a single-stage or two-stage reactor to flow-reduced iron iron ore and secondary raw materials with a wide particle size distribution, and reduced iron is reduced and discharged from the fluidized bed reduction reactor and An agglomerator 310 for producing a subsidiary material to a briquette, a separator 320 for separating the multi-array briquettes formed in the agglomerator into individual briquettes, and a melting furnace 500 for producing molten iron by melting the briquettes separated from the separator. ), And collecting the exhaust gas generated in the melting furnace, the dust is supplied to the melting furnace and the gas is supplied to the reducing gas of the fluidized-bed reduction furnace further comprises a furnace cyclone 510, the furnace cyclone 510 and the fluidized-bed reduction reactor (200) ) Is connected to the reducing gas communication through the reducing gas supply pipe 511, the melting furnace 500 and the melting furnace cyclone 510 is dust communication through the dust circulation pipe 502 In the molten iron manufacturing method in a fluidized-bed molten iron-reducing plant, which is connected in a relation,
상기 유동층환원로(200), 괴성화기(310), 분리기(320)에서 발생하는 분진을 포집하여 슬러지로 농축하는 단계,Collecting dust generated in the fluidized-bed reduction reactor 200, the compactor 310, the separator 320 and concentrating it into sludge,
상기 슬러지를 탈수하고 건조하는 단계,Dewatering and drying the sludge,
상기 슬러지를 상기 괴성화기(310)로 공급되는 분환원철 100중량부에 대해 10중량부이하의 배합비로 상기 괴성화기(310)으로 공급하는 단계를 포함하여 이루어지는 발생분진을 단광으로 괴성화하여 원료로 이용하는 용선제조방법에 관한 것을 그 기술적요지로 한다.The sludge is supplied to the compactor 310 at a blending ratio of 10 parts by weight or less based on 100 parts by weight of the reduced-reduced iron supplied to the compactor 310 as a raw material. The technical gist of the charter method to be used shall be taken.
Description
본 발명은 환원된 분환원철을 고온에서 단광(briquette)으로 괴성화하여 용융로로 장입하여 용선을 생산하는 용융환원제철방법에 관한 것으로, 보다 상세하게는 유동환원공정, 단광제조공정에서 발생하는 분진을 슬러지로 농축하여 재활용함으로써 공정의 생산성을 높이고 연료사용량을 줄이기 위한 용선제조방법에 관한 발명이다.The present invention relates to a molten iron reduction method for producing molten iron by compacting reduced reduced iron into briquettes at a high temperature and charging it into a melting furnace. More specifically, the present invention relates to dust reduction in flow reduction and briquetting manufacturing processes. The present invention relates to a molten iron manufacturing method for increasing the productivity of the process and reducing the fuel consumption by concentrating and recycling the sludge.
현재의 용선 생산공정은 고로공정이 주류를 이루고 있으며, 최근에 펠렛과 괴광석을 사용한 샤프트형 용융환원제철공정이 상업화되어 용선을 생산하고 있으나, 두 공정 모두 괴상화된 원료만을 사용해야하는 제약이 있다.In the current molten iron production process, the blast furnace process is the mainstream. Recently, shaft-type molten reduction steel making process using pellets and lump ore has been commercialized to produce molten iron, but both processes have limitations in using only the raw material. .
고로공정에서는 석탄을 가공한 코크스와 분상의 철광석과 부원료를 혼합하여 가공한 소결광을 사용하여 용선을 생산해야 함으로써 연/원료의 예비처리를 위한 설비투자비의 증가와 예비처리 과정에서 발생하는 공해문제가 심각하게 대두되고 있어 이에 따른 환경적인 규제가 강화되고 있는 실정이다. 한편, 샤프트형 용융환원 제철공정에서는 원료로 미분의 철광석을 펠렛으로 만들어 사용하거나 제한된 입도의 괴광석을 사용하여 용선을 생산하고 있다. 이와 같이 고로공정이나 샤프트형 용융환원 제철공정에서는 분상의 철광석을 직접 사용할 수 없고 예비처리 과정을 거쳐야 되므로 매장량이 풍부하고 가격도 저렴한 분철광석을 예비처리 과정을 거치지않고 바로 사용하여 용선을 생산할 수 있는 유동층식의 용융환원제철공정이 기존의 고로공정을 대체할 차세대 제철공정으로 주목받고 있으며 선진 철강 생산국을 중심으로 활발한 연구가 진행되고 있다.In the blast furnace process, molten iron must be produced using coal processed coke, sintered ore mixed with powdered iron ore and by-products, thereby increasing facility investment costs for pretreatment of raw materials, and pollution problems arising from pretreatment. As it is seriously emerging, environmental regulations are being tightened. On the other hand, in the shaft-type molten reduction steelmaking process is used to make fine iron ore as a raw material pellets or to produce molten iron using a lump ore of limited particle size. As such, in the blast furnace process or shaft-type molten reduction steelmaking process, powdered iron ore cannot be directly used and needs to be preliminarily processed, and thus rich iron deposits with low reserves and low cost can be used directly to produce molten iron. The fluidized-bed molten reduced steelmaking process is drawing attention as the next-generation steelmaking process to replace the existing blast furnace process, and active research is being conducted mainly in advanced steel producing countries.
상기의 용융환원 제철공정은 일반적으로 예비환원공정과 최종환원공정으로 구분이 되는데 예비환원단계에서는 환원로에서 원료광석을 고체상태로 예비환원시키고 최종환원단계에서는 이렇게 환원된 환원철을 용융로로 장입하여 용융시키면서 최종환원하여 용선을 생산하고 있다. 예비환원공정은 일반적으로 원료광석의 입도에 따라 이동층식 및 유동층식으로 분류되는데 입도가 작고 입도분포가 넓은 분철광석의 경우는 원료광석을 환원로에서 환원가스로 유동시키면서 환원하는 유동층식이 통기성이나 가스이용율 면에서 효율적인 것으로 알려져 있다.The molten reduction steelmaking process is generally divided into a preliminary reduction process and a final reduction process. In the preliminary reduction step, the raw ore is reduced to solid state in the reduction furnace, and the reduced iron is charged into the melting furnace in the final reduction step to melt. It is finally reduced to produce molten iron. The preliminary reduction process is generally classified into moving bed type and fluidized bed type according to the particle size of raw ore. In the case of ferrous ore with small particle size and wide particle size distribution, the fluidized bed type which reduces raw material ore while flowing from reducing furnace to reducing gas is breathable or gas. It is known to be efficient in terms of utilization.
이와 같이 분철광석을 원료로 사용하는 유동환원 공정에서 생산된 분환원철을 용융로에 장입하는 방법으로는 분환원철을 직접 장입하는 방법과 이를 단광으로 제조하여 장입하는 방법이 있다. 본 발명은 상기의 방법 중에서 분환원철을 단광으로 제조하여 용융로에 장입하는 용융환원제철공정에 있어서 생산성을 향상시키는 방법에 관한 것이다. 유동층식 예비환원로에서 생산된 분환원철을 단광으로 제조하여 용융로에 장입하여 용선을 생산하는 종래의 기술로는 대한민국 특허 제 117067호가 있으며, 도 1에 그 장치의 개략도가 도시되어 있다. 도 1에 나타난 종래의 기술은, 제1유동층환원로(31)와 제2유동층환원로(32)를 거쳐 환원된 분환원철 및 부원료를괴성화기(36)에서 단광으로 제조하여 용융로(33)에 장입하여 용선을 생산하는 공정이다. 그러나, 상기의 기술에 있어서는 제2유동층환원로(32)에서 생산된 분환원철 및 부원료를 괴성화기(36)에 장입하여 단광으로 제조하는 과정에서 분환원철 및 부원료의 일부가 그대로 배출되거나 단광이 부서지는 등 분환원철 일부의 손실을 피할 수 없다. 또한, 단광제조공정에서 발생하는 다량의 분진의 비산에 의한 손실도 야기된다. 분철광석의 유동환원공정 및 단광제조공정에서 발생하는 분진은 습식제진설비에서 포집되어 수처리설비를 거쳐 슬러지로 처리되고 있다. 이들 슬러지는 대부분 매립되고 있다.As such, the method of charging the reducing iron produced in the flow reduction process using the iron-iron ore as a raw material into the melting furnace includes a method of directly charging the iron-reducing iron and a method of manufacturing and charging it with briquettes. The present invention relates to a method of improving productivity in a molten iron reduction process in which the branched iron is produced as briquettes and charged into a melting furnace. Conventional technology for producing molten iron produced in a fluidized bed preliminary reduction furnace into briquettes and charging molten iron to produce molten iron is Korean Patent No. 117067, which shows a schematic diagram of the apparatus in FIG. The prior art shown in Figure 1, by using the compactor 36 to reduce the reduced iron and secondary raw materials reduced through the first fluidized bed reduction path 31 and the second fluidized bed reduction path 32 to the melting furnace 33 It is a process of charging and producing molten iron. However, in the above technique, part of the reduced iron and secondary raw materials are discharged as they are, or the briquettes are discharged in the process of charging the reduced iron and secondary raw materials produced in the second fluidized-bed reduction reactor 32 into the compactor 36 to produce briquettes. The loss of some of the reduced iron is inevitable. In addition, the loss caused by the scattering of a large amount of dust generated in the briquette manufacturing process. Dust generated in the flow reduction process of briquette ore and briquette manufacturing process is collected in wet dedusting facility and treated as sludge through water treatment facility. Most of these sludges are landfilled.
따라서 본 발명은 유동층식 용융환원제철공정에 있어서 발생하는 철과 탄소 성분을 함유한 분진을 공정내에서 재활용함으로써 원료의 손실을 최소화하여 공정의 생산성을 향상시키고 연료사용량을 줄여서 생산원가를 절감할 수 있는 용선제조방법을 제공하는데, 그 목적이 있다.Therefore, the present invention can minimize the loss of raw materials by recycling the dust containing iron and carbon components generated in the fluidized-bed molten iron reduction process in the process to improve the productivity of the process and reduce the fuel consumption to reduce the production cost The present invention provides a method of manufacturing a charterer.
도 1은 종래의 단광제조장치를 포함한 분철광석의 유동층식 환원로의 구성도1 is a block diagram of a fluidized bed reduction furnace of iron ore including a conventional briquette manufacturing apparatus
도 2는 본 발명에 따라 발생분진을 괴성화하여 원료로 이용하기 위한 유동층식 용융환원 제철공정의 구성도2 is a block diagram of a fluidized bed melt reduction steelmaking process for compacting the generated dust according to the present invention to use as a raw material
* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
100..... 원료 장입호퍼101..... 원료 장입관100 ..... Raw Material Loading Hopper 101 ..... Raw Material Loading Pipe
200..... 유동층 환원로 201..... 환원철 배출관200 ..... Fluidized-bed reduction furnace 201 ..... Reduced iron discharge line
203..... 제1스크러버205..... 제1공정수 배출관203 ..... 1st scrubber 205 ..... 1st process water discharge pipe
300..... 괴성화기 장입호퍼310..... 괴성화기300 ..... compactor hopper 310 ..... compactor
320..... 분리기 321..... 단광 장입관320 ..... Separator 321 ..... Briquette Filling Tube
322..... 분진 배출관323..... 제2스크러버322 ..... Dust exhaust pipe 323 ..... 2nd scrubber
325..... 제2공정수 배출관400..... 수처리장치325 ..... 2nd process water discharge pipe 400 ..... water treatment device
401..... 슬러지 배출관 402..... 제3공정수 배출관401 ..... Sludge discharge pipe 402 ..... 3rd process water discharge pipe
410..... 슬러지 처리장치411..... 슬러지 공급관410 ..... Sludge Treatment System 411 ..... Sludge Supply Pipe
500..... 용융로510..... 용융로 사이클론500 ..... Melting furnace 510 ..... Melting furnace cyclone
511..... 환원가스 공급관511 ..... reducing gas supply pipe
상기 목적을 달성하기 위한 본 발명의 용선제조방법은, 입도분포가 넓은 분철광석과 부원료를 유동환원시키는 1단 또는 2단 이상의 반응기로 구성된 유동층환원로(200), 상기 유동층환원로에서 환원되어 배출되는 분환원철과 부원료를 단광으로 제조하는 괴성화기(310), 상기 괴성화기에서 괴성화된 다열의 단광을 개개의 단광으로 분리하는 분리기(320), 상기 분리기에서 분리된 단광을 용융시켜 용선을 생산하는 용융로(500), 상기 용융로에서 발생하는 배가스를 포집하여 더스트는 용융로에 재공급하고 가스는 유동층환원로의 환원가스로 공급하는 용융로 사이클론(510)를 포함하고, 상기 용융로 사이클론(510)과 유동층환원로(200)는 환원가스공급관(511)을 통해 환원가스 소통관계로 연결되고, 상기 용융로(500)와 용융로 사이클론(510)은 더스트순환관(502)을 통해 더스트 소통관계로 연결되어 구성되는 유동층식 용융환원제철설비에서의 용선제조방법에 있어서,The molten iron manufacturing method of the present invention for achieving the above object is a fluidized bed reduction reactor (200) consisting of a one-stage or two-stage reactor to flow-reduced iron ore and subsidiary materials with a wide particle size distribution, discharged by reducing in the fluidized bed reduction reactor An aggregator 310 for producing a reduced or reduced iron and secondary raw materials as a briquette, a separator 320 for separating the multi-array briquettes formed in the agglomerator into individual briquettes, melting the briquettes separated in the separator to produce molten iron The melting furnace 500, the exhaust gas generated in the melting furnace to collect the dust is supplied back to the melting furnace and the gas is supplied to the reducing gas of the fluidized-bed reduction furnace comprising a furnace cyclone 510, the furnace cyclone 510 and the fluidized bed Reduction furnace 200 is connected to the reducing gas communication through the reducing gas supply pipe 511, the melting furnace 500 and the furnace cyclone 510 is a dust circulation pipe 502 In the molten iron manufacturing method for a communication to the dust reduction fluidized-bed type melt consisting connected in relation to steel equipment,
상기 유동층환원로(200), 괴성화기(310), 분리기(320)에서 발생하는 분진을 포집하여 슬러지로 농축하는 단계,Collecting dust generated in the fluidized-bed reduction reactor 200, the compactor 310, the separator 320 and concentrating it into sludge,
상기 슬러지를 탈수하고 건조하는 단계,Dewatering and drying the sludge,
상기 슬러지를 상기 괴성화기(310)로 공급되는 분환원철 100중량부에 대해 10중량부이하의 배합비로 상기 괴성화기(310)으로 공급하는 단계를 포함하여 구성된다.And supplying the sludge to the compactor 310 at a blending ratio of 10 parts by weight or less based on 100 parts by weight of the branched iron supplied to the compactor 310.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
본 발명에 따라 유동층환원로(200), 괴성화기(310), 분리기(320)에서 발생하는 분진을 재활용하는 방법을 도 2를 참고하여 설명한다.According to the present invention, a method for recycling the dust generated in the fluidized-bed reduction reactor 200, the compactor 310, the separator 320 will be described with reference to FIG.
본 발명에서는 먼저, 유동층환원로(200)에서 발생하는 분진과, 괴성화기(310)와 분리기(320)에서 발생하는 분진을 수처리하여 공정수와 슬러지로 분리한다. 분진의 수처리는, 유동층환원로(200)에서 발생하는 분진함유 배가스를 분진배출관(202)를 통해 제1스크러버(203)0로 보내고 또한, 상기 괴성화기(310)와 분리기(320)에서 발생하는 분진 함유 배가스를 분진배출관(322)를 통해 제2스크러버(323)로 보낸다.보내진 배가스는 스크러버를 통과하면서 공급되는 공정수와 접촉하여 가스와 분진으로 분리된다. 가스는 가스배출관(204)(324)를 통하여 배출되고 분진은 공정수와 함께 제1공정수 배출관(205) 및 제2공정수 배출관(325)을 통해 수처리장치(400)로 공급된다. 수처리설비(400)에서는 공정수에 섞여있는 분진을 슬러지 상태로 농축시켜 슬러지 배출관(401)을 통하여 슬러지 처리장치(410)로 배출하고 공정수는 제3공정수 배출관(402)으로 배출한다.In the present invention, first, the dust generated in the fluidized-bed reduction reactor 200 and the dust generated in the compactor 310 and the separator 320 are separated into process water and sludge. The water treatment of dust sends the dust-containing flue gas generated in the fluidized-bed reduction reactor 200 to the first scrubber 203 through the dust discharge pipe 202, and is generated in the compactor 310 and the separator 320. The dust-containing exhaust gas is sent to the second scrubber 323 through the dust discharge pipe 322. The exhaust gas is contacted with the process water supplied while passing through the scrubber to be separated into gas and dust. The gas is discharged through the gas discharge pipes 204 and 324, and the dust is supplied to the water treatment device 400 through the first process water discharge pipe 205 and the second process water discharge pipe 325 together with the process water. In the water treatment facility 400, the dust mixed in the process water is concentrated to a sludge state and discharged to the sludge treatment device 410 through the sludge discharge pipe 401, and the process water is discharged to the third process water discharge pipe 402.
배출된 슬러지는 탈수, 건조하기 위한 슬러지 처리장치(410)로 보낸다. 슬러지의 탈수와 건조공정에서 슬러지의 수분함량을 낮출수록 좋다. 건조된 슬러지의 입도가 유동층환원로에 공급되는 분철광석의 크기 보다 큰 경우에는 분쇄를 한다. 필요에 따라 분쇄한 상기 슬러지 처리장치에서 배출된 슬러지는 슬러지 공급관(411)을 통해 괴성화기(310)로 보낸다.The discharged sludge is sent to the sludge treatment apparatus 410 for dehydration and drying. In the sludge dewatering and drying process, the lower the water content of the sludge is, the better. If the particle size of the dried sludge is larger than the size of the iron ore supplied to the fluidized-bed reduction reactor, it is pulverized. The sludge discharged from the sludge processing apparatus, which is pulverized as necessary, is sent to the agglomerator 310 through the sludge supply pipe 411.
슬러지에는 다량의 탄소성분이 포함되어 있으며, 탄소성분은 분환원철을 단광화 하는데 악영향을 미칠 수 있는 것으로 알려져 있다. 따라서, 탄소의 첨가량을 조절할 필요가 있다. 탄소함량의 조절은 괴성화기로 공급되는 재활용 슬러지의 중량을 조절하여 최종적으로 단광처리되는 분환원철 중에 10%를 넘지 않도록 하는 것이 바람직하다.Sludge contains a large amount of carbon, which is known to adversely affect the bridging iron. Therefore, it is necessary to adjust the amount of carbon added. The control of the carbon content is preferably to control the weight of the recycled sludge supplied to the compactor so as not to exceed 10% in the briquette iron finally treated.
본 발명에 따라 슬러지를 재활용하는 단광은 밀도가 3.8~4.1g/cm3이고, 압축강도500~700kg/cm2로서 분환원철로 만들어진 단광과 동등 수준의 물리적특성을 갖는다.Briquette to recycle sludge according to the present invention has a density of 3.8 ~ 4.1g / cm 3, the compressive strength of 500 ~ 700kg / cm 2 has a physical level equivalent to the briquettes made of reduced iron.
이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
[실시예 1]Example 1
아래 표 1에 나타난 화학조성의 슬러지를 괴성화기로 재공급하여 단광을 제조한 결과 그 품질은 표 2에 나타난 바와 같이 슬러지를 재활용하지 않은 기존 공정에서 제조된 단광과 유사한 품질을 얻을 수 있었다. 이때 재활용 슬러지의 비율은 최종 단광처리되는 분환원철 중량의 10%까지 공급하였다.As a result of producing the briquette by resupplying the chemical composition sludge shown in Table 1 to the compactor, the quality was similar to that of the briquette manufactured in the existing process without recycling the sludge as shown in Table 2. At this time, the proportion of recycled sludge was supplied up to 10% of the weight of the final briquettes.
표 2에 나타난 바와 같이, 분진을 재활용하여 단광을 제조하더라도 종래의 단광과 동등 수준의 품질특성을 확보할 수 있다. 본 발명에 따라 전체 용선생산량은 슬러지를 10%까지 재활용할 경우 약 5% 정도 증가하였으며 용융로에서 연료로 사용되는 석탄의 사용량은 약 5-10% 정도 줄일 수 있었다.As shown in Table 2, even if briquettes are manufactured by recycling dust, quality characteristics equivalent to those of conventional briquettes can be secured. According to the present invention, the total amount of molten iron was increased by about 5% when the sludge was recycled to 10%, and the amount of coal used as fuel in the melting furnace was reduced by about 5-10%.
상술한 바와 같이, 본 발명의 용선제조방법에서는 분철광석의 유동환원 및 단광제조공정에서 발생하는 슬러지를 분리, 회수하여 단광제조공정에 재활용함으로써 원료의 손실을 줄여 생산성을 높일 수 있고, 또한 슬러지에 포함된 탄소성분을 연료로 사용할 수 있어 연료 사용량을 줄이는데 효과가 있다.As described above, in the molten iron manufacturing method of the present invention, the sludge generated in the flow reduction and briquetting manufacturing process of the iron ore is separated and recovered, and recycled to the briquetting manufacturing process to reduce the loss of raw materials, thereby increasing productivity. The contained carbon component can be used as a fuel, which is effective in reducing fuel consumption.
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Cited By (7)
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| KR101482403B1 (en) * | 2013-05-23 | 2015-01-13 | 주식회사 포스코 | Method for manufacturing molten iron |
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| KR20160064052A (en) * | 2016-05-17 | 2016-06-07 | 주식회사 포스코 | METHOD FOR COMPACTING Fe-CONTAINING BY-PRODUCTS IN MOLTEN IRONS MAKING PROCESS |
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| US9994928B2 (en) | 2013-03-26 | 2018-06-12 | Posco | Method for recycling iron-containing by-products discharged from coal-based molten ironmaking process, system therefor, and reduced iron agglomeration system |
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| JPS5656298A (en) * | 1979-10-16 | 1981-05-18 | Nisshin Steel Co Ltd | Preparation of mini pellet |
| JPH059529A (en) * | 1991-07-01 | 1993-01-19 | Kawasaki Steel Corp | Steel dust processing method |
| KR0162016B1 (en) * | 1995-09-05 | 1999-01-15 | 김형벽 | Converter coolant manufacturing equipment using steel waste |
| KR100340490B1 (en) * | 1996-12-24 | 2002-11-27 | 주식회사 포스코 | Method for manufacturing steel melt using pulverized coal |
| KR100276344B1 (en) * | 1996-12-24 | 2000-12-15 | 이구택 | Hot Melt Reduction |
| KR100236193B1 (en) * | 1997-12-20 | 1999-12-15 | 이구택 | Apparatus and method for manufacturing molten pig iron and reduced iron using fluidized bed |
| KR100360109B1 (en) * | 2000-12-19 | 2002-11-07 | 주식회사 포스코 | fludized bed type Smelting reduction apparatus and method for recycling fines |
| KR100435439B1 (en) * | 2000-12-20 | 2004-06-10 | 주식회사 포스코 | apparatus for recycling self-generated sludge in non-coking coal and fine ore based ironmaking |
| KR100568339B1 (en) * | 2001-08-24 | 2006-04-05 | 주식회사 포스코 | Method for manufacturing molten iron in a molten reduction device for recycling iron-containing dust |
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| US9994928B2 (en) | 2013-03-26 | 2018-06-12 | Posco | Method for recycling iron-containing by-products discharged from coal-based molten ironmaking process, system therefor, and reduced iron agglomeration system |
| KR101482403B1 (en) * | 2013-05-23 | 2015-01-13 | 주식회사 포스코 | Method for manufacturing molten iron |
| KR20160114776A (en) | 2015-03-24 | 2016-10-06 | 고재덕 | Thermal storage heating pipe |
| KR101582665B1 (en) | 2015-10-08 | 2016-01-06 | 고재덕 | Thermal storage heating pipe and System having the same |
| KR20160064052A (en) * | 2016-05-17 | 2016-06-07 | 주식회사 포스코 | METHOD FOR COMPACTING Fe-CONTAINING BY-PRODUCTS IN MOLTEN IRONS MAKING PROCESS |
| KR20200073066A (en) | 2018-12-13 | 2020-06-23 | 주식회사 포스코 | Apparatus for recycling ahs of reduction furnace |
| CN112734499A (en) * | 2021-01-26 | 2021-04-30 | 建龙阿城钢铁有限公司 | Molten iron reduction cost analysis model |
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