KR20020049589A - Coal briquette having high temperature property - Google Patents

Coal briquette having high temperature property Download PDF

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KR20020049589A
KR20020049589A KR1020000078778A KR20000078778A KR20020049589A KR 20020049589 A KR20020049589 A KR 20020049589A KR 1020000078778 A KR1020000078778 A KR 1020000078778A KR 20000078778 A KR20000078778 A KR 20000078778A KR 20020049589 A KR20020049589 A KR 20020049589A
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South Korea
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coal
weight
briquettes
parts
bituminous
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KR1020000078778A
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Korean (ko)
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KR100468455B1 (en
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류진호
조재억
이후근
안호식
신성기
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이구택
주식회사 포스코
신현준
재단법인 포항산업과학연구원
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
    • C10L5/16—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders with bituminous binders, e.g. tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L2270/00—Specifically adapted fuels

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

PURPOSE: A method for preparing coal briquette with high temperature property by using coke breeze is provided. The obtained coal briquette is for the use in COREX process. CONSTITUTION: The coal briquette is prepared by mixing (i) 15-70 wt.% of bituminous coal with a free swelling index of 6.0 or over; (ii) 30-85 wt.% of coal breeze composed of hard coal and brown coal of which free swelling index is less than 6.0. Further, the coal briquette comprises, based on the 100 parts by weight of coal breeze, 5-15 parts by weight of at least one binder selected from the group consisting of asphalt, coal tar, pitch, plastic, starch, theriac, water glass, high molecular resin, oil, cement, bentonite, clay and lime.

Description

열간특성이 우수한 성형탄{Coal briquette having high temperature property}Coal briquette having high temperature property

본 발명은 코렉스공정에 사용되는 성형탄에 관한 것으로, 보다 상세하게는 미분탄을 자유팽창지수인자를 기준으로 배합조건을 제어하여 열간특성을 개선한 성형탄에 관한 것이다.The present invention relates to coal briquettes used in the Korex process, and more particularly, to coal briquettes in which hot coal is improved by controlling blending conditions based on free expansion index factors.

코렉스(COREX)공정은 코크스(coke)가 아닌 석탄을 바로 연료로 사용하므로 연료 사용 면에서 많은 장점을 가진 것으로 알려져 있다. 연료로 사용되는 석탄 중에서 약 8mm이하의 미분탄은 용융로 내에서 충분히 연소되지 못하고 용융로 외부로 배출되어 집진기에 포집되며, 과다할 경우 공정 내에서 불균형을 초래하여 사용에 제약을 받게된다. 그런데, 코스용으로 수입된 석탄의 상당량이 약 8mm이하의 미분으로 구성되어 있다.The COREX process is known to have many advantages in terms of fuel use because it uses coal instead of coke as a fuel. Pulverized coal of about 8mm or less of coal used as fuel is not sufficiently burned in the melting furnace, is discharged to the outside of the melting furnace and collected in the dust collector, and excessively causes the imbalance in the process and is restricted in use. By the way, a considerable amount of coal imported for the course is composed of fine powder of about 8mm or less.

이 미분탄은 코렉스 공정에서 사용되지 못하고 PCI(Pulverized Coal Injection)용이나 코크스용 탄으로 전용되고 있으나, 코렉스용 석탄의 성질이 규정되어 있기 때문에 사용되지 못한 미분탄을 다른 용도로 전용하는 데에는 한계를 가지고 있는 실정이다.The pulverized coal is not used in the corex process and is used for pulverized coal injection (PCI) or coke coal. However, due to the nature of the coal for corex, the pulverized coal is not used for other purposes. It is true.

지금까지 미분탄을 성형탄으로 만들어 코렉스공정에 적용하는 기술은 알려져 있지 않다. 다만, 미분탄을 성형탄으로 만들어 코크스 제조용으로 사용하는 기술로서 일본 공개특허공보 평7-97576호 그리고, 한국 공고특허공보 1990-4935(공고일: 90. 7. 12)호에 제시되어 있다.Until now, there is no known technique for making pulverized coal into coal briquettes. However, as a technique for making pulverized coal into coal briquettes and using it for coke production, it is disclosed in Japanese Patent Application Laid-open No. Hei 7-97576 and Korean Patent Publication No. 1990-4935 (published date: 90. 7. 12).

일본 공개특허공보 평7-97576(공개일 95. 4. 11)호에서는 석탄 타르 및 피치(pitch) 등의 결합재를 분탄에 첨가한 후에 혼련 성형하여 성형탄을 얻고 이 성형탄을 건류로를 이용하여 가스를 열매체로 하여 건류하는 성형코크스의 제조방법이 제시되어 있다.In Japanese Patent Laid-Open No. 7-97576 (published on April 11, 1995), a binder such as coal tar and pitch is added to powdered coal, followed by kneading to obtain coal briquettes. The manufacturing method of the molding coke which distills into a heat medium is proposed.

또한, 한국 공고특허공보 1990-4935(공고일: 90. 7. 12)호에서는 분탄에 결합제로서 연화점이 25℃인 소프트 피치(soft-pitch)를 혼합하고 성형한 성형탄를 제조하고, 이 성형탄 30%와 분탄 70%를 혼합한 후 코크스 오븐에 장입하여 성형탄 배합 코크스를 제조하는 기술이 에 제시되어 있다. 이 기술은 성형탄 제조용 원료석탄을 휘발분:26-28%, 평균반사율:0.97-1.05, 조직평형지수:0.92-0.96, 강도지수:3.8-4.2 그리고, 유동도는 2.3에서 장입탄중 분탄부분의 유동도까지의 범위를 갖도록 약점결탄을 증가배합시키는 것으로, 코크스 품질 변동없이 강점결탄 및 중강점탄 배합을 약 17%정도 감소시키고 그대신 저렴한 약점결탄 배합을 약 17%정도 증가시켜 코크스 제조원가를 절감하고 있다.In addition, Korean Patent Publication No. 1990-4935 (published date: July 12, 90) discloses a coal briquette formed by mixing a coal-coated soft-pitch having a softening point of 25 ° C. as a binder and forming the coal briquettes. Techniques for making coal briquette blended coke by mixing 70% coal and then charging it in a coke oven are presented in. This technique uses raw coal for coal briquettes in terms of volatilization: 26-28%, average reflectance: 0.99-1.05, tissue equilibrium index: 0.92-0.96, strength index: 3.8-4.2, and flow rate at 2.3. By increasing and blending the weak coking coal to have a range of up to 20%, the coking coal and heavy coking coal mixture is reduced by about 17% without changing the coke quality and the cheap coking coal formulation is increased by about 17% to reduce the coke production cost.

이와 같이 미분탄을 코크스 오븐에서 코크스로 만들어 용융로에서 사용하는 기술은 알려져 있는데 반해, 성형탄으로 만들어 바로 용융로에서 사용하는 기술은 제시되어 있지 않는 실정이다.As such, a technique for making pulverized coal from coke ovens and using the same in a melting furnace is known, but a technique for making a coal briquette and using the same in a melting furnace is not disclosed.

본 발명은 미분탄을 성형탄으로 만들어 바로 코렉스공정의 용융로에 사용하기 위한 기술의 일환으로서, 코렉스공정에서 요구하는 열간특성을 확보할 수 있는 성형탄을 제공하는데, 그 목적이 있다.The present invention is to provide a coal briquette which can secure the hot characteristics required in the Korex process as part of the technology for making pulverized coal into coal briquettes and immediately using it in the melting furnace of the Korex process.

상기 목적을 달성하기 위한 본 발명의 성형탄은,Coal briquettes of the present invention for achieving the above object,

① 자유팽창지수(FSI;Free Swelling Index)가 6.0이상의 역청탄:15∼70중량% 나머지 자유팽창지수가 6.0미만의 역청탄과 아역청탄의 1종 또는 2종을 함유하는 미분탄과,(1) Bituminous coal having a free swelling index (FSI) of 6.0 or more: 15 to 70% by weight of pulverized coal containing one or two kinds of bituminous coal and sub-bituminous coal with a remaining free expansion index of less than 6.0;

② 상기 미분탄 100중량부에 대하여 점결제:5∼15중량부로 조성된다.(2) A caking agent: 5-15 weight part with respect to 100 weight part of said pulverized coals.

이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

일반적으로 석탄은 탄화도(炭化度)에 따라 탄소분이 약 60%인 이탄(泥炭), 약 70%인 아탄(亞炭) 및 갈탄, 약 70∼80%인 아역청탄, 약 80∼90%인 역청탄, 약 95%인 무연탄으로 나뉜다. 이중에서도 제철용 석탄으로는 역청탄과 아역청탄이 주로 이용된다. 석탄의 용도에 의하여 점결탄과 비점결탄으로 구분되며 점결성의 정도의 차에 의해 약점결탄(無水無灰基의 탄소함유량이 80∼83%), 준강점결탄(83∼85%), 강점결탄(85∼90%)의 세 가지로 나누어진다. 일반적으로 역청탄은 점결성을 가지고 있으며, 아역청탄은 점결성이 없는 비점결탄이다.In general, coal has a carbon content of about 60% peat, about 70% peat and lignite, about 70-80% subbituminous coal, about 80-90% bituminous coal, It is divided into anthracite which is about 95%. Among them, bitumen coal and sub-bituminous coal are mainly used for steel coal. According to the use of coal, it is divided into coking coal and non-coking coal, and the weak coking coal (80 ~ 83% of carbon content of water-free base), semi coking coal (83 ~ 85%), strong coking coal (85 ~ 90) %). Bituminous coal is generally coking, and sub-bituminous coal is non-coking.

점결성은 석탄을 가열하면 350∼400℃ 부근에서 열연화성을 나타내고 유동현상을 보여 입자간 상호결합과 동시에 열분해 가스의 발생에 의하여 팽창하며 450∼500℃부근에서 고화에 의한 수축현상을 나타내는 것을 의미한다. 이와 같은 석탄의 점결성을 평가하는 방법중에서 도가니의 자유팽창 측정에 의한 자유팽창지수(FSI)로 석탄을 평가할 수 있다. 자유팽창지수가 높을수록 석탄의 점결성이 강한 성형탄이 제조된다.Coking property means that when coal is heated, it shows thermosoftening property in the vicinity of 350 ~ 400 ℃ and shows the flow phenomenon, and it expands due to the generation of pyrolysis gas at the same time with the mutual bonding between particles and shows the shrinkage phenomenon by solidification around 450 ~ 500 ℃. . In such a method of evaluating the cohesiveness of coal, coal can be evaluated by the free expansion index (FSI) by measuring the free expansion of the crucible. The higher the free expansion index, the more coal briquettes of coal are produced.

본 발명자들은 미분탄을 코렉스용의 성형탄으로 제조하기 위하여 성형탄의 열간특성을 개선하기 위한 연구를 진행하던 중에, 복수품목의 미분탄을 배합할 때 여러 가지 석탄의 관리품목 중에서 자유팽창지수를 기준으로 미분탄을 적정하게 배합하면 성형탄의 열간특성이 확보되는데, 주목하게 되었다. 특히, 자유팽창지수를 기준으로 고품위의 탄을 최적량 배합하고 나머지는 아역청탄으로 대체하여도 성형탄에 요구되는 특성을 확보할 수 있었다. 본 발명에 따라 미분탄을 배합하게 되면 성형탄의 열간특성을 확보하면서 아역청탄도 사용할 수 있어 원료비를 절약할 수 있다.The present inventors are working to improve the hot characteristics of coal briquettes for producing coal briquettes for Corex, and when pulverized coals of plural items are blended, the coal dust is selected based on the free expansion index. Proper mixing ensures the hot properties of the coal briquettes. In particular, even if the optimum amount of high-quality coal is combined based on the free expansion index and the remainder is replaced with sub-bituminous coal, the characteristics required for the coal briquettes can be obtained. When the pulverized coal is blended according to the present invention, sub-bituminous coal can be used while securing the hot characteristics of the coal briquettes, thereby reducing raw material costs.

본 발명의 연구에 따르면 자유팽창지수가 6.0이상의 역청탄을 미분탄에 15∼70중량%로 배합하는 것이 바람직하다. 역청탄의 자유팽창지수가 6.0미만인 경우에는 점결성이 낮아서 용융로 내에서 충분하게 열원으로 작용하지 못한다. 또한, 자유팽창지수가 6.0이상의 역청탄의 함량이 15중량% 미만에서는 미분탄 중에 역청탄이 충분하지 못하여 성형탄의 열간 특성에 문제가 생길 수 있으며, 역청탄의 함량이 70중량%를 초과하는 경우에는 역청탄의 비중이 높아져서 성형탄의 원료비 상승을 가져오며, 성형탄의 열간특성은 그다지 상승되지 않는다. 미분탄 100중량%중에서 자유팽창지수가 6.0이상의 역청탄:15-70중량%로 하고, 나머지는 자유팽창지수가 6.0미만의 역청탄 또는 아역청탄의 1종 또는 2종을 사용한다.According to the study of the present invention, it is preferable to blend bitumen coal having a free expansion index of 6.0 or more in the pulverized coal at 15 to 70% by weight. If the free expansion index of the bituminous coal is less than 6.0, the cohesiveness is low so that it does not sufficiently serve as a heat source in the melting furnace. In addition, if the free expansion index of the bituminous coal content of 6.0 or more is less than 15% by weight, the bituminous coal may not be enough in the pulverized coal, which may cause a problem in the hot characteristics of the coal briquettes. This increases the raw material cost of the coal briquettes, and the hot characteristics of the coal briquettes do not increase so much. Among the 100% by weight of pulverized coal, the bitumen coal having a free expansion index of 6.0 or more: 15-70% by weight, and the remainder is one or two kinds of bitumen or sub-bituminous coal having a free expansion index of less than 6.0.

이와 같이 배합된 미분탄의 100중량부에 대하여 점결제를 5-15중량부 혼합하는데, 점결제의 혼합량이 5중량부 미만의 경우에는 미분탄 중에 점결제가 충분히 있지 못하여 성형탄 강도에 문제가 생길 수 있으며, 첨가량이 15중량부를 초과하는 경우에는 미분탄과의 혼합시에 부착 등의 장애를 일으킬 수가 있다.5-15 parts by weight of the binder is mixed with 100 parts by weight of the pulverized coal blended as described above. However, when the amount of the binder is less than 5 parts by weight, there is not enough binder in the pulverized coal. When the added amount exceeds 15 parts by weight, it may cause an obstacle such as adhesion during mixing with the pulverized coal.

본 발명에서 점결제는 비튜멘, 아스팔트, 석탄 타르, 피치, 플라스틱, 전분, 당밀, 물유리, 고분자수지, 오일, 시멘트, 벤토나이트, 클레이, 석회의 그룹에서 선택된 1종 또는 2종이상을 사용할 수 있다.In the present invention, the binder may be one or two or more selected from the group of bitumen, asphalt, coal tar, pitch, plastic, starch, molasses, water glass, polymer resin, oil, cement, bentonite, clay, and lime. .

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

표 1에 나타난 평균성상을 갖는 3.4mm이하의 석탄을 사용하여 표2의 배합비로 혼합한 후에, 점결제로서 6∼8중량부의 비튜멘(Bitumen)을 균일하게 혼합한 후 롤 프레스 형태의 성형기(Briquetter Roll Press)를 사용하여 성형탄을 제조하였다. 하기 표 2는 본 발명의 실시예와 이를 비교하기 위한 비교예를 나타낸 것이다.After mixing at a blending ratio of Table 2 using 3.4 mm or less coal having the average properties shown in Table 1, 6-8 parts by weight of bitumen was uniformly mixed as a caking agent, followed by a roll press forming machine ( Briquette roll was manufactured using Briquetter Roll Press). Table 2 shows an example of the present invention and a comparative example for comparing the same.

석탄종류Coal type 석탄 성상Coal appearance 고유수분(IM)Intrinsic Moisture (IM) 회분(ASH)Ash (ASH) 휘발분(VM)Volatile Powder (VM) 고정탄소(FC)Fixed Carbon (FC) 자유팽창지수(FSI)Free Expansion Index (FSI) 역청탄Bituminous coal NPNP 1.181.18 9.559.55 18.0718.07 71.2071.20 8.08.0 PDPD 1.141.14 9.479.47 20.3020.30 69.0969.09 8.28.2 HJHJ 0.770.77 8.488.48 19.9019.90 70.8570.85 7.67.6 아역청탄Sub-border MXMX 2.752.75 7.947.94 33.3533.35 55.9655.96 5.35.3 CRCR 1.851.85 10.2510.25 25.6925.69 62.2162.21 2.82.8 HVHV 3.293.29 11.3211.32 31.1831.18 54.2154.21 1.01.0 NP는 Norwich Park로 호주산 석탄PD는 Peak Downs로 호주산 석탄HJ는 Huajin으로 중국산 석탄MX는 Mt. Thorley로 호주산 석탄CR은 South Black Water로 호주산 석탄HV는 Hunter Vally로 호주산 석탄NP is Norwich Park, Australian coal PD is Peak Downs, Australian coal HJ is Huajin, Chinese coal MX is Mt. Australian coal CR with Thorley South Black Water Australian coal HV with Hunter Vally Australian coal

실험예Experimental Example 역청탄Bituminous coal 아역청탄Sub-border 점결제(Bitumen)Bitumen CO2반응성(분)CO2 reactivity (min) NPNP PDPD HJHJ MXMX CRCR HVHV 실시예1Example 1 3030 7070 88 71.1071.10 실시예2Example 2 3030 7070 66 56.4456.44 실시예3Example 3 3030 7070 66 53.0453.04 실시예4Example 4 5050 5050 88 79.7079.70 실시예5Example 5 5050 5050 88 64.2064.20 실시예6Example 6 3030 7070 88 51.0051.00 비교예1Comparative Example 1 1010 9090 88 39.6039.60 비교예2Comparative Example 2 100100 66 44.2044.20 비교예3Comparative Example 3 100100 66 39.1839.18 점결제는 미분탄 100중량부에 대한 첨가량(중량부)Addition amount of additives to 100 parts by weight of pulverized coal (parts by weight)

상기 표 2에 나타난 바와 같이 본 발명의 실시예 1∼6에서는 자유팽창지수(FSI)가 6.0이상인 역청탄을 30∼50중량%를 함유된 미분탄 100중량부에 대하여, 6∼8중량부의 비튜멘 점결재를 균일하게 혼합한 후 미분탄을 가압 성형하여 성형탄을 제조한 것이다.As shown in Table 2, in Examples 1 to 6 of the present invention, 6 to 8 parts by weight of bitumen point based on 100 parts by weight of fine coal containing 30 to 50% by weight of bituminous coal having a free expansion index (FSI) of 6.0 or more. The coal briquettes were manufactured by uniformly mixing the binder and then compacting the fine coal.

그리고, 비교예 1은 자유팽창지수(FSI)가 8.0인 NP 역청탄을 10중량%를 함유된 미분탄 100중량부에 대하여, 8중량부의 비튜멘 점결재를 균일하게 혼합한 후 미분탄을 가압 성형하여 성형탄을 제조하였고, 비교예 2는 자유팽창지수(FSI)가 5.3인 MX탄 100중량부에 대하여, 6중량부의 비튜멘 점결재를 균일하게 혼합한 후 미분탄을 가압 성형하여 성형탄을 제조하였으며, 비교예 3은 자유팽창지수(FSI)가 2.8인 CR탄 100중량부에 대하여, 6중량부의 비튜멘 점결재를 균일하게 혼합한 후 미분탄을가압 성형하여 성형탄을 제조하였다.In Comparative Example 1, 8 parts by weight of bitumen caking additive was uniformly mixed with 100 parts by weight of finely divided coal containing 10 wt% of NP bituminous coal having a free expansion index (FSI) of 8.0, and then the powdered coal was press-molded to form coal briquettes. In Comparative Example 2, 6 parts by weight of bitumen caking additive was uniformly mixed with 100 parts by weight of MX coal having a free expansion index (FSI) of 5.3, and then the fine coal was pressed to form coal briquettes. 3 was uniformly mixed with 6 parts by weight of bitumen caking additive with respect to 100 parts by weight of CR coal having a free expansion index (FSI) of 2.8, and then press-molded pulverized coal to prepare coal briquettes.

성형탄의 열간특성은 CO2반응성으로 측정하였다.The hot properties of the coal briquettes were measured by CO 2 reactivity.

용융로 내부에서는 하기식과 같은 반응으로 인하여 철광석에서 쇳물을 생산하게 된다.In the furnace, iron ore is produced by the reaction as shown in the following formula.

FeO + CO → Fe + CO2 FeO + CO → Fe + CO 2

CO2+ C → 2COCO 2 + C → 2CO

FeO + C → Fe + COFeO + C → Fe + CO

화학식 2에서와 같이 용융로 내부에서는 CO2가스와 성형탄의 Fixed Carbon이 반응하는 Carbon solution반응에 의하여 쇳물을 생산하는 연료로서 작용하게 된다. CO2반응성은 15∼20mm로 균일한 입도를 가지게 한 성형탄 약 100g을 1200℃의 온도에서 질소(N2)가스 분위기에서 Char를 만든후에 CO2가스와 반응시켜 측정한다. 이때, 성형탄의 Fixed Carbon의 무게감소율이 50%에 해당되는 시간을 CO2반응성 시간으로 측정하였으며, CO2반응성 시간이 길어질수록 용융로 내부에서 연로로써 장시간 사용할수 있어 연료비 절감에 기여하게 된다.As shown in Formula 2, the inside of the smelting furnace acts as a fuel for producing molten water by a carbon solution reaction in which CO 2 gas and fixed carbon of coal briquettes are reacted. The CO 2 reactivity is measured by reacting about 100 g of coal briquettes having a uniform particle size of 15 to 20 mm with a CO 2 gas after making Char in a nitrogen (N 2 ) gas atmosphere at a temperature of 1200 ° C. At this time, the time was measured weight reduction rate of the Fixed Carbon seonghyeongtan this corresponding to 50% of the CO 2 reactivity time, the longer the CO 2 reactivity of time can be used for a long time as fuel within the furnace and contribute to fuel saving.

상기 표2에서 알 수 있는 바와 같이, 본 발명의 범위를 만족하는 발명예 1∼6의 경우는 CO2반응성 시간이 51분이상으로 우수한 열간특성을 가진 성형탄이 제조되는데 반하여, 본 발명의 범위를 만족하지 못하는 비교예 1∼3의 경우는 상기한 발명예의 경우에 비하여 CO2반응성이 45분이하로 빠르다는 것을 알 수 있다.As can be seen in Table 2, in the case of Inventive Examples 1 to 6 satisfying the scope of the present invention, while the coal briquettes having excellent hot characteristics are manufactured with a CO 2 reactivity time of 51 minutes or more, In the case of Comparative Examples 1 to 3 which are not satisfactory, it can be seen that the CO 2 reactivity is faster than 45 minutes as compared with the case of the above-described invention.

상술한 바와 같이, 본 발명은 자유팽창지수(FSI)가 6.0이상인 역청탄을 15∼70중량%를 함유된 미분탄과 점결재를 균일하게 혼합한 후 미분탄을 가압 성형하여 성형탄을 제조함으로써 열간특성이 우수한 성형탄을 제조 할 수 있다.As described above, the present invention has excellent hot characteristics by uniformly mixing pulverized coal containing 15 to 70% by weight of bituminous coal having a free expansion index (FSI) of 6.0 or more and a caking additive, and then molding the pulverized coal to produce coal briquettes. Coal briquettes can be manufactured.

Claims (2)

자유팽창지수(FSI;Free Swelling Index)가 6.0이상의 역청탄:15∼70중량% 나머지 자유팽창지수가 6.0미만의 역청탄과 아역청탄의 1종 또는 2종을 함유하는 미분탄과, 이 미분탄 100중량부에 대하여 점결제:5∼15중량부로 조성되는 열간특성이 우수한 성형탄.Bituminous coal having a free swelling index (FSI) of 6.0 or more: 15 to 70% by weight of pulverized coal containing 15 or 70% by weight of the remaining free expansion index containing one or two kinds of bituminous coal and sub-bituminous coal; Coking agent: Coal briquettes excellent in hot properties composed of 5 to 15 parts by weight. 제 1항에 있어서, 상기 점결제는 비튜멘, 아스팔트, 석탄 타르, 피치, 플라스틱, 전분, 당밀, 물유리, 고분자수지, 오일, 시멘트, 벤토나이트, 클레이, 석회의 그룹에서 선택된 1종 또는 2종이상임을 특징으로 하는 열간특성이 우수한 성형탄.According to claim 1, wherein the binder is one or two or more selected from the group of bitumen, asphalt, coal tar, pitch, plastic, starch, molasses, water glass, polymer resin, oil, cement, bentonite, clay, lime Coal briquettes having excellent hot characteristics, characterized in that.
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