JP4892928B2 - Ferro-coke manufacturing method - Google Patents
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- JP4892928B2 JP4892928B2 JP2005313901A JP2005313901A JP4892928B2 JP 4892928 B2 JP4892928 B2 JP 4892928B2 JP 2005313901 A JP2005313901 A JP 2005313901A JP 2005313901 A JP2005313901 A JP 2005313901A JP 4892928 B2 JP4892928 B2 JP 4892928B2
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- 239000000571 coke Substances 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 92
- 239000003245 coal Substances 0.000 claims description 60
- 229910052742 iron Inorganic materials 0.000 claims description 46
- 239000002994 raw material Substances 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000013078 crystal Substances 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 10
- 238000000197 pyrolysis Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 238000000465 moulding Methods 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000012256 powdered iron Substances 0.000 description 2
- 238000013441 quality evaluation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011338 soft pitch Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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Description
本発明は、高炉原料として用いるのに好適な、石炭および鉄鉱石を原料として乾留して製造するフェロコークスの製造方法に関し、特に高結晶水鉱石を用いたフェロコークスの製造方法に関するものである。 The present invention relates to a method for producing ferrocoke, which is suitable for use as a blast furnace raw material and produced by dry distillation using coal and iron ore as raw materials, and particularly relates to a method for producing ferrocoke using high crystal water ore.
原料石炭に粉鉄鉱石を配合し、この混合物を通常の室炉式コークス炉で乾留してフェロコークスを製造する技術としては、ａ）石炭と粉鉄鉱石との粉体混合物を室炉式コークス炉に装入する方法、ｂ）石炭と鉄鉱石を冷間、すなわち室温で成型し、その成型物を室炉式コークス炉に装入する方法、などが検討されてきた（例えば、非特許文献１参照。）。しかし通常の室炉式コークス炉は珪石煉瓦で構成されているので、鉄鉱石を装入した場合に鉄鉱石が珪石煉瓦の主成分であるシリカと反応し、低融点のファイヤライトが生成して珪石煉瓦の損傷を招く。このため室炉式コークス炉でフェロコークスを製造する技術は、工業的には実施されていない。 The technology for blending powdered iron ore with raw coal and producing ferro-coke by dry distillation of this mixture in a normal chamber furnace coke oven is as follows: a) A powder mixture of coal and powdered iron ore A method of charging into a furnace, b) a method of forming coal and iron ore cold, that is, at room temperature, and charging the molded product into a chamber-type coke oven have been studied (for example, non-patent literature) 1). However, ordinary furnace-type coke ovens are composed of silica brick, so when iron ore is charged, iron ore reacts with silica, which is the main component of silica brick, and low-melting firelite is produced. This causes damage to the quartz brick. For this reason, the technique which manufactures ferro-coke with a chamber-type coke oven is not implemented industrially.
近年室炉式コークス製造法に替わるコークス製造方法として、連続式成型コークス製造法が開発されている。連続式成型コークス製造法では、乾留炉として、珪石煉瓦ではなくシャモット煉瓦にて構成される竪型シャフト炉を用い、石炭を冷間で所定の大きさに成型後、シャフト炉に装入し、循環熱媒ガスを用いて加熱することにより成型炭を乾留し、成型コークスを製造する。資源埋蔵量が豊富で安価な非微粘結炭を多量に使用しても、通常の室炉式コークス炉と同等の強度を有するコークスが製造可能なことが確認されているが、使用する石炭の粘結性が高い場合にはシャフト炉内で成型炭が軟化融着し、シャフト炉操業が困難になると共に変形や割れ等のコークス品質低下を招く。 In recent years, a continuous molding coke manufacturing method has been developed as a coke manufacturing method replacing the chamber furnace type coke manufacturing method. In the continuous molding coke manufacturing method, a vertical shaft furnace composed of chamotte bricks instead of silica bricks is used as a carbonization furnace, coal is molded into a predetermined size in the cold, and then charged into the shaft furnace. The coal is carbonized by heating using a circulating heat medium gas to produce a molded coke. It has been confirmed that even if a large amount of non-slightly caking coal that is abundant in resource reserves and inexpensive is used, coke having the same strength as a normal chamber-type coke oven can be produced. When the caking property is high, the coal is softened and fused in the shaft furnace, which makes it difficult to operate the shaft furnace and causes deterioration of coke quality such as deformation and cracking.
連続式成型コークス製造法でのシャフト炉内での融着抑制のために、石炭に鉄鉱石を全体量の１５〜４０％となるように添加し、冷間で成型物を製造し、シャフト炉に装入する方法が提案されている（例えば、特許文献１参照。）。この方法では、鉄鉱石には粘結性がないので、冷間の状態で成型物を製造するために高価なバインダを添加する必要があるので、石炭と鉄鉱石を加熱した熱間の状態で塊成型物に成型する方法も提案されている（例えば、特許文献２参照。）。 In order to suppress fusion in the shaft furnace in the continuous molding coke manufacturing method, iron ore is added to the coal so as to be 15 to 40% of the total amount, and the molded product is manufactured coldly. There has been proposed a method of charging (see, for example, Patent Document 1). In this method, since iron ore is not caustic, it is necessary to add an expensive binder to produce a molded product in a cold state. A method of molding into a lump molded product has also been proposed (see, for example, Patent Document 2).
上記のように石炭と鉄鉱石とを混合した成型物を熱処理して、強度に優れた成型コークス（フェロコークス）を製造するためには、鉄鉱石に最適な粒度があり、２ｍｍ以上、１０ｍｍ以下の粗粒割合を最適化した成型コークスの製造方法が知られている（例えば、特許文献３参照。）。また、石炭と鉄鉱石とを混合したペレットについても、還元後の強度に優れた炭材内装ペレットとして、鉄鉱石中の１０μｍ以下の微粉割合を最適化したものが知られている（例えば、特許文献４参照。）。
原料である鉄鉱石の品質のうち、鉄鉱石の粒度がフェロコークスの強度に及ぼす影響については、上記のように従来から様々な検討がなされている。一方で、鉄鉱石が保有している結晶水の影響も大きいと考えられるが、結晶水がフェロコークスの強度に及ぼす影響については十分に検討が行なわれていない。したがって本発明の目的は、このような従来技術の課題を解決し、フェロコークスの原料である鉄鉱石が保有している結晶水が、フェロコークスの強度に与える影響を検討し、高結晶水鉱石を用いる際にも、高強度を有するフェロコークスを製造可能な、フェロコークスの製造方法を提供することにある。 As described above, various studies have been made on the influence of the iron ore particle size on the strength of ferro-coke among the quality of the raw iron ore. On the other hand, although the influence of crystallization water held by iron ore is considered to be large, the effect of crystallization water on the strength of ferrocoke has not been sufficiently studied. Therefore, the object of the present invention is to solve such problems of the prior art, examine the effect of crystallization water possessed by iron ore that is a raw material of ferrocoke on the strength of ferrocoke, and It is another object of the present invention to provide a method for producing ferro-coke that can produce ferro-coke having high strength even when the ferro-coke is used.
このような課題を解決するための本発明の特徴は以下の通りである。
（１）石炭および鉄鉱石を混合した混合物を原料とし、該混合物を乾留してフェロコークスを製造する際に、前記原料中の石炭に対する鉄鉱石中の結晶水の質量割合x％と、前記石炭のギーセラー最高流動度（ＭＦ）とが、下記（イ）式および（ロ）式を満たすように定められたギーセラー最高流動度を有する石炭を前記原料として用いることを特徴とするフェロコークス製造方法。
The features of the present invention for solving such problems are as follows.
(1) When a mixture obtained by mixing coal and iron ore is used as a raw material and ferrocoke is produced by dry distillation of the mixture, a mass ratio x% of crystal water in the iron ore to the coal in the raw material, and the coal The ferro-coke production method , wherein coal having a maximum Gieseller fluidity determined so as to satisfy the following formulas (a) and (b) is used as the raw material .
logMF≧0.16x+1.0 （但し、x＜１．９）・・・（イ）
logMF≧0.62x+0.12 （但し、x≧１．９）・・・（ロ）
（２）さらに、原料中の石炭に対する鉄鉱石中の結晶水の質量分率x％と、前記石炭のギーセラー最高流動度（ＭＦ）とが、下記（ハ）式を満たすことを特徴とする（１）に記載のフェロコークス製造方法。
logMF ≧ 0.16x + 1.0 (x <1.9) (B)
logMF ≧ 0.62x + 0.12 (however, x ≧ 1.9) (B)
(2) Further, the mass fraction x% of crystal water in the iron ore with respect to the coal in the raw material and the Geeseler maximum fluidity (MF) of the coal satisfy the following formula (c) ( The ferro-coke manufacturing method as described in 1) .
logMF≦0.13x+2.5 ・・・（ハ） logMF ≦ 0.13x + 2.5 (C )
本発明によれば、原料コストを上昇させることなく高炉使用に耐え得る高強度のフェロコークスの製造が可能となる。また、高結晶水鉱石をフェロコークス製造原料として使用できるので、その分、焼結鉱原料として使用する割合を低減可能であり、焼結鉱が高品位化する。今後、良質な焼結鉱原料の供給量が減少した場合にも、低品位な鉄鉱石をフェロコークス原料として使用することが可能であり、資源拡大効果が期待される。 According to the present invention, it is possible to produce ferro-coke having high strength that can withstand the use of a blast furnace without increasing the raw material cost. Moreover, since a high crystal water ore can be used as a ferro-coke manufacturing raw material, the ratio used as a sinter ore raw material can be reduced correspondingly, and a high quality is obtained for a sintered ore. In the future, even when the supply of high-quality sintered ore raw materials decreases, it is possible to use low-grade iron ore as ferro-coke raw materials, and resource expansion effects are expected.
フェロコークスは、原料である石炭および鉄鉱石を混合し、これを乾留して製造される。なお、原料を混合後乾留前に原料の混合物を成型しておくとフェロコークスの強度が向上するので、通常の場合成型行程を有することが多い。鉄鉱石中の結晶水は約３００〜５００℃で熱分解して放出される。これに伴い鉄鉱石粒子中の空隙は増加し比表面積は増加する。一方、石炭の軟化溶融温度は３５０〜５００℃であり、鉄鉱石中の結晶水の放出温度帯とほぼ一致している。この結果、石炭の軟化溶融温度域において、鉄鉱石粒子の表面積増加にともなう鉱石からの酸素放出反応（還元）が促進され、石炭のコークス化作用（軟化溶融性）を阻害する。 Ferro-coke is produced by mixing raw materials coal and iron ore and subjecting them to dry distillation. In addition, since the intensity | strength of ferrocoke will improve if the mixture of a raw material is shape | molded before dry distillation after mixing a raw material, it usually has a shaping | molding process in many cases. Crystallized water in the iron ore is released by thermal decomposition at about 300-500 ° C. Along with this, voids in the iron ore particles increase and the specific surface area increases. On the other hand, the softening and melting temperature of coal is 350 to 500 ° C., which is almost the same as the discharge temperature zone of crystal water in iron ore. As a result, in the softening and melting temperature range of coal, the oxygen release reaction (reduction) from the ore accompanying the increase in the surface area of the iron ore particles is promoted, and the coking action (softening and melting property) of the coal is inhibited.
結晶水割合の高い鉄鉱石を配合する場合、製造するフェロコークスの強度を維持するためには原料中の石炭の軟化溶融性を良くして粒子の結合力を高める必要がある。原料に粘結材を添加する場合は、粘結材の軟化溶融性も良くすることが好ましい。 When blending iron ore with a high ratio of crystal water, in order to maintain the strength of the ferro-coke to be produced, it is necessary to improve the softening and melting property of the coal in the raw material and increase the binding force of the particles. When adding a binder to a raw material, it is preferable to improve the softening and melting property of the binder.
したがって、結晶水を多く含む鉱石を原料としてもフェロコークスの強度を維持できる、すなわち、鉄鉱石中の結晶水の割合によらず強度に優れたフェロコークスを製造する方法として、鉄鉱石中の結晶水の割合に応じて軟化溶融性を補填する方法が考えられる。必要以上の補填を行なうと、製造コストの増加が懸念されるため、結晶水の割合に対してどの程度の軟化溶融性（粘結性）が必要であるかを明らかにする必要がある。そこで、所定の強度を有するフェロコークスを製造するために必要な結晶水と石炭の粘結性の関係を明らかにして、以下の本発明のフェロコークスの製造方法を完成した。 Therefore, the strength of ferrocoke can be maintained even if the ore containing a large amount of crystal water is used as a raw material, that is, as a method for producing ferrocoke having excellent strength regardless of the proportion of crystal water in iron ore, A method of compensating for softening and melting properties according to the proportion of water is conceivable. If more than necessary compensation is performed, there is a concern about an increase in manufacturing cost. Therefore, it is necessary to clarify how much softening and melting property (caking property) is required with respect to the ratio of crystal water. Thus, the relationship between the water of crystallization required for producing ferrocoke having a predetermined strength and the caking property of coal was clarified, and the following ferrocoke production method of the present invention was completed.
本発明では、原料として石炭および鉄鉱石を混合し、該混合物を乾留して得られるフェロコークスを製造する際に、原料中の石炭の質量に対する鉄鉱石中の結晶水の割合に応じて石炭の粘結性を決定する。具体的には、原料中の石炭の質量に対する鉄鉱石中の結晶水の割合に応じて石炭のギーセラー最高流動度（ＭＦ）、あるいは膨張圧を決定し、決定したギーセラー最高流動度（ＭＦ）、あるいは膨張圧を有するような石炭をフェロコークスの原料としてフェロコークスを製造する。従来から測定が行なわれており、データの蓄積が豊富な点で、ギーセラー最高流動度（ＭＦ）を用いて石炭の配合を決定することが好ましい。 In the present invention, when producing ferro-coke obtained by mixing coal and iron ore as raw materials and carbonizing the mixture, according to the ratio of crystal water in iron ore to the mass of coal in raw materials, Determine caking properties. Specifically, according to the ratio of crystal water in the iron ore with respect to the mass of coal in the raw material, the coal's Gieseller maximum fluidity (MF) or expansion pressure is determined, and the determined Gieseller maximum fluidity (MF), Alternatively, ferro-coke is produced using coal having an expansion pressure as a raw material for ferro-coke. It is preferable to determine the blend of coal using the Gieseeller maximum fluidity (MF) from the viewpoint that the measurement has been performed conventionally and the accumulation of data is abundant.
原料中の石炭の質量に対する鉄鉱石中の結晶水の割合に応じて石炭のギーセラー最高流動度（ＭＦ）を決定する際には、原料中の石炭に対する鉄鉱石中の結晶水の質量割合と、石炭のギーセラー最高流動度（ＭＦ）の関係を、図１のグラフにおいて、斜線で示す、折れ線Ａの上方範囲の組合せとすることが好ましい。石炭のギーセラー最高流動度（ＭＦ）が必要以上に高い場合は、製造コストが増加するので、図２に示すように、原料中の石炭の質量に対する鉄鉱石中の結晶水の割合と、石炭のギーセラー最高流動度（ＭＦ）の関係が、直線Ｂの下方範囲の組合せとすることが好ましい。従って、図２において直線Ａ１、Ａ２、Ｂに囲まれた組合せとすることが特に好ましい。原料中の石炭に対する鉄鉱石中の結晶水の質量割合をx、ギーセラー最高流動度をMFとして、直線Ａ１はlogMF=0.1579x+1.000（但し、x＜１．９）、直線Ａ２はlogMF=0.6190x+0.1238（但し、x≧１．９）、直線ＢはlogMF=0.1250x+2.500で表すことができる。従って、図１において斜線で示す、折れ線Ａの上方範囲は下記（イ）式および（ロ）式で、図２において直線Ａ１、Ａ２、Ｂに囲まれた範囲は下記（イ）式、（ロ）式、（ハ）式で表すことができる。 When determining the coal Gieseller maximum fluidity (MF) according to the ratio of crystal water in iron ore to the mass of coal in raw material, the mass ratio of crystal water in iron ore to coal in raw material, It is preferable that the relationship between the coal Gieseller maximum fluidity (MF) is a combination in the upper range of the polygonal line A, which is indicated by diagonal lines in the graph of FIG. When the coal's Gieseler maximum fluidity (MF) is higher than necessary, the production cost increases. As shown in FIG. 2, the ratio of crystal water in iron ore to the mass of coal in the raw material, It is preferable that the relation of the ghiser cell maximum fluidity (MF) is a combination in the lower range of the straight line B. Therefore, a combination surrounded by straight lines A1, A2, and B in FIG. 2 is particularly preferable. Straight line A1 is logMF = 0.1579x + 1.000 (where x <1.9), straight line A2 is logMF = 0.6190, where x is the mass ratio of crystal water in iron ore to coal in the raw material and x is the highest Gieseller fluidity. x + 0.1238 (where x ≧ 1.9) and the straight line B can be expressed by logMF = 0.1250x + 2.500. Accordingly, the upper range of the broken line A shown by the oblique lines in FIG. 1 is the following formulas (a) and (b), and the range surrounded by the straight lines A1, A2, and B in FIG. ) And (c).
logMF≧0.16x+1.0 （但し、x＜１．９）・・・（イ）
logMF≧0.62x+0.12 （但し、x≧１．９）・・・（ロ）
logMF≦0.13x+2.5 ・・・（ハ）
従って、特に結晶水の割合の高い鉄鉱石（原料中の石炭の質量に対する鉄鉱石中の結晶水の割合が１．９質量％以上）を用いる際には、図２において直線Ａ２と直線Ｂとの間の領域のＭＦを有する石炭を用いてフェロコークスを製造することで、高強度を有するフェロコークスを低コストで製造することができる。
logMF ≧ 0.16x + 1.0 (x <1.9) (B)
logMF ≧ 0.62x + 0.12 (however, x ≧ 1.9) (B)
logMF ≦ 0.13x + 2.5 (C)
Therefore, when using iron ore with a high ratio of crystal water (the ratio of crystal water in iron ore is 1.9% by mass or more with respect to the mass of coal in the raw material), straight lines A2 and B in FIG. Ferro-coke can be produced at low cost by producing ferro-coke using coal having an MF in the range of between.
フェロコークスは軟化溶融性を調整するために、原料としてさらに粘結材を混合することができる。粘結材とは、ピッチ、軟ピッチ、中ピッチなどの石炭系粘結材、ＡＳＰやＰＤＡなどの石油系粘結材、膨潤炭などの溶剤処理炭、その他、芳香族性が高く、軟化溶融する高分子系の物質等である。揮発分が多いものを多量に混合すると強度が低下する場合があるため、粘結材を混合する場合はフェロコークス全体の１０質量％以下とすることが好ましい。粘結材を混合する場合は、フェロコークス全体の１０質量％以下であれば、石炭を粘結材に置き換えてギーセラー最高流動度（ＭＦ）を調整しても効果は変わらないと考えることができ、原料中の石炭および粘結材の質量に対する鉄鉱石中の結晶水の割合に応じて石炭の粘結性を決定する。 Ferro-coke can be further mixed with a binder as a raw material in order to adjust the softening and melting property. Binders include coal-based binders such as pitch, soft pitch, and medium pitch, petroleum-based binders such as ASP and PDA, solvent-treated coal such as swollen coal, and other highly aromatic, softening and melting. High molecular weight materials. When a large amount of volatile matter is mixed, the strength may be lowered. Therefore, when the binder is mixed, it is preferably 10% by mass or less of the entire ferrocoke. When mixing the binder, it can be considered that the effect does not change even if the coal seller is replaced with the binder and the maximum flow rate (MF) is adjusted if the ferro-coke is 10% by mass or less. The caking property of coal is determined according to the ratio of crystal water in iron ore to the mass of coal and caking material in the raw material.
フェロコークス原料中の石炭の質量に対する鉄鉱石中の結晶水の割合がフェロコークス品質に及ぼす影響について調べるために、フェロコークスの製造試験を行なった。尚、フェロコークスの製造および品質評価は以下の手順で実施した。 In order to investigate the influence of the ratio of water of crystallization in iron ore on the mass of coal in the ferro-coke raw material on the ferro-coke quality, a ferro-coke production test was conducted. Ferro-coke production and quality evaluation were carried out according to the following procedure.
まず、フェロコークス用の原料調整を行なった。石炭と鉄鉱石の配合割合および石炭と鉄鉱石の種類を各種変更した原料を調整した。使用した各種鉄鉱石Ａ〜Ｘの性状として、成分組成と結晶水の割合を表１に示す。石炭と鉄鉱石を混合したのち、成型機により１８ｃｃの成型物を製造した。この成型物を熱処理炉で乾留してフェロコークスを得た。 First, the raw material preparation for ferro-coke was performed. The raw material which changed the compounding ratio of coal and iron ore and the kind of coal and iron ore was adjusted. Table 1 shows the component composition and the ratio of water of crystallization as the properties of the various iron ores A to X used. After mixing coal and iron ore, an 18 cc molding was produced by a molding machine. This molded product was carbonized in a heat treatment furnace to obtain ferrocoke.
製造したフェロコークスの品質評価はドラム試験機で行なった。ＪＩＳではコークスの強度評価には１５０回転１５ｍｍ指数（ＤＩ１５０／１５）を使用することになっているが、フェロコークスは通常のコークスと比較すると密度が高いため体積破壊よりも表面破壊により破壊が進行する。したがって、１５０回転６ｍｍ指数（ＤＩ１５０／６）を用いて強度評価を行なった。 The quality evaluation of the manufactured ferro-coke was performed with a drum testing machine. In JIS, the strength of coke is evaluated at 150 rpm and 15 mm index (DI150 / 15). However, ferro-coke has higher density than normal coke, so the fracture progresses by surface fracture rather than volume fracture. To do. Therefore, strength evaluation was performed using 150 rotation 6 mm index (DI150 / 6).
フェロコークスの基準強度を１５０回転６ｍｍ指数（ＤＩ１５０／６）で８２とし、製造した各種のフェロコークスの内、強度が８２であったものについて石炭の質量に対する鉄鉱石中の結晶水の割合と、石炭の粘結性をプロットした。粘結性の指標としてギーセラー最高流動度（ＭＦ）を用いた結果を図１に示す。図１において、強度８２以上のフェロコークスを得るためには、線Ａを含む線Ａの上部の、斜線で示す領域のＭＦを有する石炭を原料として用いる必要があることが分かる。 The reference strength of ferro-coke was 82 at 150 rpm 6 mm index (DI150 / 6), and among the various ferro-coke produced, the ratio of crystal water in iron ore with respect to the mass of coal for the strength of 82, Coal caking properties were plotted. The result of using the Gieseler maximum fluidity (MF) as an index of caking property is shown in FIG. In FIG. 1, it can be seen that in order to obtain ferro-coke having a strength of 82 or more, it is necessary to use as a raw material coal having MF in a region indicated by hatching above line A including line A.
Ａ 折れ線
Ａ１ 直線
Ａ２ 直線
Ｂ 直線
A broken line A1 straight line A2 straight line B straight line
Claims (2)
logMF≧0.16x+1.0 （但し、x＜１．９）・・・（イ）
logMF≧0.62x+0.12 （但し、x≧１．９）・・・（ロ） When a mixture of coal and iron ore is used as a raw material and ferrocoke is produced by dry distillation of the mixture, the mass ratio x% of crystal water in the iron ore with respect to the coal in the raw material, Coal having a flow rate (MF) having a Gieseler maximum fluidity determined so as to satisfy the following formulas (a) and (b) is used as the raw material .
logMF ≧ 0.16x + 1.0 (x <1.9) (B)
logMF ≧ 0.62x + 0.12 (however, x ≧ 1.9) (B)
logMF≦0.13x+2.5 ・・・（ハ） Further, the mass fraction x% of crystal water in the iron ore for the coal in the raw material, Gisera maximum fluidity degree of the coal (MF), but to claim 1, characterized by satisfying the following (c) below The ferro-coke manufacturing method as described.
logMF ≦ 0.13x + 2.5 (C)
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