WO2014129337A1 - 冶金用コークスの製造方法 - Google Patents
冶金用コークスの製造方法 Download PDFInfo
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- WO2014129337A1 WO2014129337A1 PCT/JP2014/052993 JP2014052993W WO2014129337A1 WO 2014129337 A1 WO2014129337 A1 WO 2014129337A1 JP 2014052993 W JP2014052993 W JP 2014052993W WO 2014129337 A1 WO2014129337 A1 WO 2014129337A1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
Definitions
- the present invention relates to a method for producing a metallurgical coke, particularly a high-strength metallurgical coke, by carbonizing coal.
- Coke used as a reducing material and heat source in a steelmaking process using a blast furnace, etc. pulverizes multiple brands of raw coal and blends them at a predetermined ratio, and the resulting blended coal is charged into a coke oven and dry-distilled. It is manufactured by By the way, the blast furnace can realize a stable operation by maintaining the air permeability in the furnace in a good state. For that purpose, it is effective to use a high-strength metallurgical coke that is not easily pulverized in the furnace.
- Non-patent Document 1 The model proposed by “Castle” is known for the basic idea of blending coal to produce high-strength metallurgical coke (Non-patent Document 1).
- this model the constituent components of coal are divided into a fibrous part and a caking component.
- Castle reveals that the optimization of the strength of the fibrous portion and the amount of the caking component is important in producing high-strength coke.
- the recent coal blending technology in recent years has developed such a concept, and uses, for example, a coalification degree parameter and a caking property parameter.
- a coalification parameter JIS M 8816 vitrinite average maximum reflectance (hereinafter abbreviated as “Ro”), volatile matter of coal, and the like are known.
- a caking property parameter a maximum fluidity measured by a fluidity test using a JIS M 8801 Gisela plastometer (hereinafter referred to as “MF”) or a JIS M 8801 dilatometer was used. The total expansion coefficient measured by the expansibility test is often used.
- Non-Patent Document 2 CBI (Composition Balance Index) proposed by Shapiro et al.
- This method applies the concept of concrete to raw coal blending. It is divided into an active component that softens and melts by heating coal macerals and an inactive component that does not soften and melt, and the active component is cemented.
- This is a method for estimating the coke strength by regarding the component (hereinafter referred to as “inert”) as an aggregate.
- the component hereinafter referred to as “inert” as an aggregate.
- the optimum amount of caking component is added according to the content of all inert components contained in the blended coal (hereinafter abbreviated as “total inert amount”, “TI”). It is considered that the coke strength can be increased by bringing the ratio of these two components (total inert amount and caking component) close to the optimum value.
- the optimum ratio of the inert component (inert) and the caking component for producing high-strength coke varies depending not only on the amount of the inert but also on the “ability to adhere the inert”. For example, if the adhesive strength of the caking component in the blended coal is weak, the required amount of the caking component increases accordingly. Therefore, it is considered that the ratio of the inert component and the caking component in this case is relatively larger than the ratio of the caking component required.
- Patent Document 1 the mutual relationship between the average reflectance Ro and the maximum fluidity MF and the total inert amount TI is examined, and when Ro and MF are set to predetermined values, the obtained coke strength is the value of TI. Accordingly, it is reported that the amount of inert when a parabola convex upward is drawn and the intensity becomes maximum varies depending on the size of MF.
- Patent Document 2 reports a method for estimating coke strength based on the properties of raw coal including MF and TI.
- the content of the inert component in the coal can be measured by the method for measuring the fine structure component of coal defined in JIS M8816.
- coal pulverized to 850 ⁇ m or less is mixed with a thermoplastic or thermosetting binder to form a briquette, and the surface to be tested is polished, and then discriminated by optical properties and morphological properties under a microscope.
- the content rate of each fine structure component in the sample is a method in which the percentage of the number measured for each component is taken as a volume percentage.
- the total inert amount (TI) is obtained by the following equation (1).
- Total inert amount (%) Fuji knit (%) + micri unit (%) + (2/3) x semi-fuji knit (%) + mineral (%)-(1) Here, all contents are vol. %.
- the mineral content can be calculated from the anhydrous base ash content and the anhydrous base total sulfur content using the Parr formula described in JIS M 8816.
- Non-Patent Document 3 the influence of Ro on the ratio between the optimum caking component and the amount of inert is examined, but the influence of MF is not examined.
- the log MF and TI of the coal blend are log MF: 2.58 log ddpm, TI: 24.0 vol. % Or logMF: 2.69 log ddpm, TI: 24.7 vol. It is reported that high-strength coke can be produced only under the two types of conditions of%.
- Patent Document 3 2.83 log ddpm ⁇ log MF ⁇ 2.35 log ddpm, 35.6 vol. % ⁇ TI ⁇ 32.1 vol. % High-strength coke has been successfully produced.
- Fig. 2 shows the range of logMF and TI that have been studied in the conventional research. However, the influence on the coke strength of MF and TI under the conditions other than the range of FIG. 2 (2.90 log ddpm ⁇ log MF ⁇ 2.35 log ddpm, 36.0 vol.% ⁇ TI ⁇ 24.0 vol.%) Not reported.
- An object of the present invention is to produce a metallurgical coke having higher strength than before by optimizing the relationship between the maximum fluidity (MF) of the blended coal and the total amount of inert gas (TI).
- the present invention proposes the following method. That is, the present invention is a method for producing coke by dry distillation of coal blended with a plurality of brands of coal. As the blended coal, the total inert amount (TI) is 3.5 vol. % To 25.0 vol.
- the metallurgical coke production method is characterized in that a material having a maximum fluidity (log MF) in the range of 1.8% to 2.3 log ddpm is used.
- the total inert amount (TI (vol.%)) And the maximum fluidity (log MF (log ddpm)) by the Gisela plastometer method are as follows. It is more preferable to use a material exhibiting properties within the range surrounded by b, c, d and e. Point a (log MF: 2.3, TI: 3.5), point b (log MF: 1.8, TI: 3.5), point c (log MF: 1.8, TI: 18.0), point d (Log MF: 2.0, TI: 25.0) and point e (log MF: 2.3, TI: 25.0)
- the maximum fluidity (log MF) of the blended coal by the Gisela plastometer method is the maximum fluidity (log MF) of each brand coal constituting the blended coal by the Gisela plastometer method and the above-mentioned in the blended coal. It is a weighted average value calculated based on the constituent mass ratio of brand charcoal.
- coke can be produced under a simple concept regarding coal blending.
- high strength metallurgical coke can be produced using blended coal obtained by blending a large amount of coal other than raw coal that has been conventionally used. Therefore, according to the present invention, the range of choice of coal that can be used is widened, restrictions due to differences in resources are relaxed, and it becomes possible to manufacture and supply coke for metallurgical metal with stable quality. Will be able to do it.
- FIG. 1 is a graph showing the log MF and TI ranges of coal blends suitable for the present invention.
- FIG. 2 is a graph showing the log MF and TI ranges of the blended coal in the prior art.
- FIG. 3 is a photomicrograph of coke obtained from conventional blended coal and low inert blended coal.
- FIG. 4 shows the relationship between the TI of the coal blend prepared so that the log MF (log ddpm) is 2.2 to 2.3, and the drum strength DI (150/15) of the coke obtained by dry distillation of the coal blend. It is a graph.
- FIG. 5 is a graph showing the relationship between the TI of the coal blend prepared so that the log MF is 1.8 to 2.0 log ddpm and the drum strength DI (150/15) of the coke obtained by dry distillation of the coal blend. is there.
- FIG. 2 shows the relationship between the log MF (log ddpm) and the total inert amount TI (vol.%) Of the conventional blended coal, which has been used in manufacturing metallurgical coke.
- the structure of coke produced using blended coal that has been blended and adjusted under the prior art is a structure in which a solid material called inert is bonded with a paste-like material that is a caking component, as is also the case with concrete. It has become. That is, it is similar to the role of cement and aggregate in concrete and needs to contain some amount of inert components.
- the role of the caking component for adhering the inert component is also important. Therefore, conventionally, a high strength metallurgical coke has been produced by increasing the blending amount of the coal having a high maximum fluidity MF that greatly affects the coke strength, thereby increasing the MF of the blended coal.
- the total inert amount TI is 20 to 30 vol. It has been reported that the coke strength tends to be maximum when the content is%, and the coke strength tends to decrease even if the total inert amount TI is larger or smaller than the range.
- a similar tendency is also disclosed in Non-Patent Document 4, where the total inert amount TI is 20-30 vol. %, It is recognized that the drum strength of coke is maximized.
- the same tendency is also disclosed in Patent Document 1, and in the disclosed example, the total inert amount TI is 31 vol. % Shows the tendency of coke strength to become maximum.
- log MF logarithm log MF
- the relationship was investigated. As a result, when carbonized coal obtained by blending multiple brands of coal is subjected to dry distillation to produce coke, the total amount of inert metals TI is 3.5 to 25.0 vol. %, The maximum fluidity (log MF) according to the Gisela plastometer method was found to be effective so as to exhibit a property surrounded by the range of 1.8 to 2.3 log ddpm. A more preferable range of the total inert amount TI in the above range is 3.5 to 21.5 vol.
- the more preferable range of the maximum fluidity (log MF) by the Gisela plastometer method is 1.8 to 2.2 log ddpm, particularly from the viewpoint of effectively using low fluidity coal. 1.8 to 2.0 log ddpm is preferable.
- the more preferable method of the present invention is on and inside the pentagonal line shown in FIG. That is, in the method of carbonizing coal blended by blending multiple brands of coal and producing coke, as the blended coal, the total inert amount (TI vol.%) And the maximum fluidity by the Gieseler plastometer method log MF log ddpm) having a property within the range surrounded by the points in FIG. 1 (a, b, c, d and e below) is used.
- the structure of the coke produced by the method of the present invention is different from the coke structure similar to that of the conventional blended coal produced under the condition of being on and inside the square line in FIG. 2, and there are few inert components in the coke, and The caking component is mostly coke which is softened, melted and solidified.
- coal blends with a low content of inert components produce coke with different pore structures, unlike conventional blending concepts when blending coals with a high content of inert components.
- the inventors have confirmed through experiments the suitable blending conditions for coal blends with a low content of inert components.
- the preferred range of total inertness (TI) and maximum fluidity (MF) is different between the conventional method and the method of the present invention, and arrived at the present invention. That is, according to the present invention, the total inert amount (TI) as the blended coal is 3.5 vol. % Or more 25.0 vol. %,
- the highest fluidity (log MF) according to the Gieseler plastometer method is 1.8 log ddpm to 2.3 log ddpm, and the one with the properties can be used to produce high strength metallurgical coke. I understood it.
- high strength metallurgical coke can be produced preferably by setting it on a pentagonal line connecting the following points a to e in FIG. . That is, point a (log MF: 2.3 log ddpm, TI: 3.5 vol.%), Point b (log MF: 1.8 log ddpm, TI: 3.5 vol.%), Point c (log MF: 1.8) log ddpm, TI: 18.0 vol.%), point d (log MF: 2.0 log ddpm, TI: 25.0 vol.%) and point e (log MF: 2.3 log ddpm, TI: 25.0 vol.%) ).
- log MF and TI (vol.%) Of the blended coal are weighted average based on the dry mass standard blending ratio of the coal from the log MF and TI of each coal constituting the blended coal. It is preferable to obtain. If the log MF and TI of each brand coal are measured in advance, the log MF and TI of the blended coal can be easily obtained by calculation, and it is not necessary to measure the log MF and TI of the blended coal every time the blend is changed. is there. Although TI is a volume fraction, since the density of coal has a small difference between brands, the TI obtained by actually measuring blended coal and the TI obtained by the above weighted average are almost the same.
- the coking strength is lowered because the caking components are also poorly bonded to each other. Further, in the region on the right side of the pentagon shown in FIG. 1, since TI is excessive with respect to MF, the strength decreases due to poor adhesion of inert. Furthermore, since the TI in the blended coal is extremely small in the left region of the pentagon shown in FIG. 1, the effect of improving the strength as a composite material of the caking component and the inert cannot be obtained, and the coke strength is lowered.
- the content of the inert component contained in the raw coal varies greatly depending on the coal brand, it roughly has a certain tendency depending on the production area.
- Australian coal and Canadian coal have an inert content of 30 vol.
- coking coals exceeding 50%.
- Indonesian charcoal, New Zealand charcoal, and rice charcoal have an inert component content of 20 vol. % Of coking coal, and the content of inert components is 3 vol.
- Coking coal which is about%, also exists.
- the production area of the raw coal is not particularly mentioned, but when carrying out the present invention, a large amount of coal having such a low amount of inert components is used.
- the blended coal may include additives such as a binder, oils, powdered coke, petroleum coke, resins, and waste.
- the blended coal (1 to 6 in 1) with a constant average reflectance Ro of 1.00%, (of 2 1 to 8), (3 to 1 to 6), (4 to 1 to 6) and (5 to 1 to 5) were subjected to dry distillation, and the properties of the resulting coke were tested.
- the coal filling conditions were a constant of 8 mass% moisture and a charged bulk density of 750 kg / m 3 , and the pulverized particle size condition of coal was 3 mm or less of 100%.
- the carbonization conditions were a carbonization temperature of 1050 ° C. and a carbonization time of 6 hours.
- Table 1 shows the properties of the coal used in the dry distillation test.
- the average maximum reflectance (Ro) is a value measured according to JIS M 8816
- the Gieseller maximum fluidity (log MF) is the highest fluidity (MF) measured according to JIS M 8801.
- Common logarithm values and volatile matter (VM, dry base) are values measured in accordance with JIS M 8812
- TI is a value measured in accordance with JIS M 8816 and calculated by equation (1).
- Tables 2 to 6 show the composition of each blended coal (dry coal blend ratio (mass%) of each coal) and the results of the dry distillation test.
- FIG. 4 shows the relationship between TI and drum strength DI (150/15) when the maximum flow rate of coal blender is adjusted to satisfy 2.3 log ddpm ⁇ log MF ⁇ 2.2 log ddpm.
- Fig. 5 shows the relationship between TI and drum strength DI (150/15) when the maximum coalescer flow rate of blended coal is adjusted to 2.0 log ddpm ⁇ log MF ⁇ 1.8 log ddpm. It was. The target value of the drum strength DI (150/15) was 82.7.
- FIGS. As shown in FIG. 4, in the range of 2.3 log ddpm ⁇ log MF ⁇ 2.2 log ddpm, 25.0 vol. % ⁇ TI ⁇ 3.5 vol.
- coke having a drum strength DI (150/15) of a target value or more can be produced.
- logMF 1.9 log ddpm, 21.5 vol. % ⁇ TI ⁇ 3.5 vol.
- the drum strength DI (150/15) becomes a coke having a target value or more. It was confirmed that the strength of coke after CO 2 reaction (CSR) showed the same tendency as the drum strength DI (150/15).
- the method proposed in the present invention is basically applicable to a vertical metallurgical furnace such as a blast furnace, and can be applied to other blast furnace refining techniques.
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Abstract
Description
ここで、含有量はすべてvol.%である。
点a(logMF:2.3、TI:3.5)、点b(logMF:1.8、TI:3.5)、点c(logMF:1.8、TI:18.0)、点d(logMF:2.0、TI:25.0)および点e(logMF:2.3、TI:25.0)
点a(logMF:2.3、TI:3.5)、点b(logMF:1.8、TI:3.5)、点c(logMF:1.8、TI:18.0)、点d(logMF:2.0、TI:25.0)および点e(logMF:2.3、TI:25.0)
即ち、点a(logMF:2.3 log ddpm、TI:3.5vol.%)、点b(logMF:1.8 log ddpm、TI:3.5vol.%)、点c(logMF:1.8 log ddpm、TI:18.0vol.%)、点d(logMF:2.0 log ddpm、TI:25.0vol.%)および点e(logMF:2.3 log ddpm、TI:25.0vol.%)である。
Claims (3)
- 複数銘柄の石炭を配合してなる配合炭を乾留してコークスを製造する方法において、前記配合炭として、全イナート量(TI)が3.5vol.%~25.0vol.%の範囲、ギーセラープラストメータ法による最高流動度(logMF)が1.8~2.3 log ddpmの範囲内の性質を示すものを用いることを特徴とする冶金用コークスの製造方法。
- 前記配合炭として、全イナート量(TI(vol.%))と、ギーセラープラストメータ法による最高流動度(logMF(log ddpm))が、図1中の下記の点a、b、c、dおよびeに囲まれた範囲内の性質を示すものを用いることを特徴とする請求項1に記載の冶金用コークスの製造方法。
点a(logMF:2.3、TI:3.5)、点b(logMF:1.8、TI:3.5)、点c(logMF:1.8、TI:18.0)、点d(logMF:2.0、TI:25.0)および点e(logMF:2.3、TI:25.0) - 配合炭のギーセラープラストメータ法による最高流動度(logMF)は、配合炭を構成する各銘柄炭のギーセラープラストメータ法による最高流動度(logMF)と配合炭中における前記銘柄炭の構成質量比率に基づき算出される加重平均値であることを特徴とする請求項1または2に記載の冶金用コークスの製造方法。
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CN201480009888.3A CN105073954B (zh) | 2013-02-21 | 2014-02-10 | 冶金用焦炭的制造方法 |
JP2015501393A JP5888539B2 (ja) | 2013-02-21 | 2014-02-10 | 冶金用コークスの製造方法 |
KR1020157020352A KR101735231B1 (ko) | 2013-02-21 | 2014-02-10 | 야금용 코크스의 제조 방법 |
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Cited By (3)
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WO2016024513A1 (ja) * | 2014-08-15 | 2016-02-18 | Jfeスチール株式会社 | 冶金用コークスおよびその製造方法 |
WO2020179576A1 (ja) * | 2019-03-04 | 2020-09-10 | Jfeスチール株式会社 | 石炭の評価方法及び配合炭の調製方法並びにコークスの製造方法 |
CN114556079A (zh) * | 2019-10-28 | 2022-05-27 | 杰富意钢铁株式会社 | 煤的惰质组组织的表面张力推定方法、煤的表面张力推定方法和焦炭的制造方法 |
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- 2014-02-10 CN CN201480009888.3A patent/CN105073954B/zh active Active
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Patent Citations (4)
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JP2001187887A (ja) * | 1999-10-20 | 2001-07-10 | Kawasaki Steel Corp | 高炉用高反応性高強度コークスおよびその製造方法 |
JP2007023190A (ja) * | 2005-07-19 | 2007-02-01 | Kobe Steel Ltd | コークスの製造方法、及び、銑鉄の製造方法 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016024513A1 (ja) * | 2014-08-15 | 2016-02-18 | Jfeスチール株式会社 | 冶金用コークスおよびその製造方法 |
WO2020179576A1 (ja) * | 2019-03-04 | 2020-09-10 | Jfeスチール株式会社 | 石炭の評価方法及び配合炭の調製方法並びにコークスの製造方法 |
TWI718018B (zh) * | 2019-03-04 | 2021-02-01 | 日商Jfe鋼鐵股份有限公司 | 煤的評估方法及混合煤的調製方法,以及焦炭的製造方法 |
JPWO2020179576A1 (ja) * | 2019-03-04 | 2021-03-11 | Jfeスチール株式会社 | 石炭の評価方法及び配合炭の調製方法並びにコークスの製造方法 |
CN114556079A (zh) * | 2019-10-28 | 2022-05-27 | 杰富意钢铁株式会社 | 煤的惰质组组织的表面张力推定方法、煤的表面张力推定方法和焦炭的制造方法 |
CN114556079B (zh) * | 2019-10-28 | 2024-04-09 | 杰富意钢铁株式会社 | 煤的惰质组组织的表面张力推定方法、煤的表面张力推定方法和焦炭的制造方法 |
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JPWO2014129337A1 (ja) | 2017-02-02 |
KR20150100904A (ko) | 2015-09-02 |
KR101735231B1 (ko) | 2017-05-12 |
TWI527895B (zh) | 2016-04-01 |
CN105073954B (zh) | 2017-05-24 |
JP5888539B2 (ja) | 2016-03-22 |
TW201437353A (zh) | 2014-10-01 |
CN105073954A (zh) | 2015-11-18 |
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