JP5609578B2 - Blast furnace operation method using unfired carbon-containing agglomerated ore - Google Patents
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本発明は、アルミナ量の多い鉄鉱石を配合した非焼成含炭塊成鉱を用いて高炉操業を行う方法に関するものである。 The present invention relates to a method for operating a blast furnace using an unfired carbon-containing agglomerated mineral containing iron ore with a large amount of alumina.
世界的な鉄鉱資源の動向から、今後、鉄鉱石の品位は低下することは確実であり、脈石成分が多い鉄鉱石を製鉄原料として使用せざるを得ない。通常、鉄鉱石は、予備処理の後、焼結し、焼結鉱として使用するが、脈石に由来するアルミナ（Ａｌ2Ｏ3）量が増大する（１．８％を超える）と、焼結鉱の被還元性や、軟化溶融特性が悪化することが知られている（非特許文献１〜２、参照）。 From the global trend of iron ore resources, it is certain that the quality of iron ore will decline in the future, and iron ore with a high gangue component must be used as a raw material for iron making. Usually, iron ore is sintered after pretreatment and used as sintered ore, but if the amount of alumina (Al 2 O 3 ) derived from gangue increases (over 1.8%), It is known that the reducibility of the ore and the softening and melting properties deteriorate (see Non-Patent Documents 1 and 2).
焼結鉱が高炉内を降下しつつ還元されるにつれて、未還元の含ＦｅＯスラグが、低温域で溶融し、焼結鉱中に融液が生成する。この融液が焼結鉱内部の気孔を閉塞し、還元ガスの拡散を妨げるとともに、ＦｅＯの活量も小さくなるので、焼結鉱の高温での被還元性や、軟化溶融特性が悪化すると考えられている。 As the sintered ore is reduced while descending in the blast furnace, the unreduced FeO-containing slag melts in a low temperature region, and a melt is generated in the sintered ore. This melt closes the pores inside the sinter, prevents the reduction gas from diffusing, and the activity of FeO is reduced, so that the reducibility at high temperatures and softening and melting properties of the sinter are considered to deteriorate. It has been.
アルミナの悪影響を抑制し、高アルミナ焼結鉱を多量に使用する高炉操業方法が、これまでいくつか開示されている。 Several blast furnace operation methods that suppress the adverse effects of alumina and use a large amount of high alumina sintered ore have been disclosed so far.
例えば、特許文献１には、羽口部から微粉炭を吹き込む高炉操業方法において、炉頂から装入する焼結鉱中のアルミナ量が１．９％を超えるとき、焼結鉱の塩基度（ＣａＯ／ＳｉＯ2）を２．０以上とすることが開示されている。 For example, in Patent Document 1, in the blast furnace operation method in which pulverized coal is blown from the tuyere, when the amount of alumina in the sintered ore charged from the top of the furnace exceeds 1.9%, the basicity of the sintered ore ( It is disclosed that CaO / SiO 2 ) is 2.0 or more.
この方法においては、焼結鉱の塩基度を高くして、Ａｌ2Ｏ3による高温域での還元率の低下を抑制しているが、塩基度を調整する必要があり、その結果、スラグ量が増大するので、炉内の改善効果に限界がある。 In this method, the basicity of the sintered ore is increased to suppress the reduction of the reduction rate in the high temperature range due to Al 2 O 3, but the basicity needs to be adjusted, and as a result, the slag amount Therefore, the improvement effect in the furnace is limited.
特許文献２には、高アルミナ焼結鉱（Ａｌ2Ｏ3：２．０〜３．０質量％、ＳｉＯ2：３．９〜４．９質量％、ＭｇＯ：０．５〜１．２質量％）と低アルミナ焼結鉱（Ａｌ2Ｏ3：１．０〜１．７質量％、ＳｉＯ2：４．５〜６．０質量％、ＭｇＯ：０．８〜２．５質量％）を作り分け、スラグのＡｌ2Ｏ3成分が操業管理値以下となるように配合し、高炉に装入する高炉操業方法が開示されている。 In Patent Document 2, high alumina sintered ore (Al 2 O 3 : 2.0 to 3.0% by mass, SiO 2 : 3.9 to 4.9% by mass, MgO: 0.5 to 1.2% by mass) %) And low alumina sintered ore (Al 2 O 3 : 1.0 to 1.7% by mass, SiO 2 : 4.5 to 6.0% by mass, MgO: 0.8 to 2.5% by mass). A method of operating a blast furnace in which the Al 2 O 3 component of the slag is formulated so as to be equal to or less than the operation control value and charged into the blast furnace is disclosed.
この方法によれば、スラグ成分の大きな変更を伴わずに、高Ａｌ2Ｏ3焼結鉱を使用することができるが、少なくとも２基の焼結機が必要となって、設備コストが増大するし、また、２種の焼結鉱を均一に高炉内へ混合・配合することは、そもそも困難である。 According to this method, a high Al 2 O 3 sintered ore can be used without a large change in the slag component, but at least two sintering machines are required, which increases the equipment cost. In addition, it is difficult in the first place to uniformly mix and blend the two types of sintered ores into the blast furnace.
特許文献３には、羽口部から微粉炭を吹き込む高炉操業方法において、焼結鉱中のＡｌ2Ｏ3量が増加したとき、増加量に応じて、配合するスクラップの量を増加することが開示されている。 In Patent Document 3, in the blast furnace operation method in which pulverized coal is blown from the tuyere, when the amount of Al 2 O 3 in the sintered ore increases, the amount of scrap to be blended is increased according to the increase amount. It is disclosed.
この方法によれば、焼結鉱中のＡｌ2Ｏ3量の増減による炉内通気性の変動に迅速に対応して、微粉炭の吹込量を増大し、高炉操業の安定化を図ることができるが、Ａｌ2Ｏ3の悪影響は抜本的に解消されていないので、微粉炭の吹込量増大による限定的な効果しか期待できない。 According to this method, it is possible to quickly respond to fluctuations in the air permeability of the furnace due to the increase or decrease in the amount of Al 2 O 3 in the sintered ore, increase the amount of pulverized coal injection, and stabilize the blast furnace operation. Although the adverse effect of Al 2 O 3 has not been drastically eliminated, only a limited effect due to an increase in the amount of pulverized coal can be expected.
したがって、現在、脈石成分中のＡｌ2Ｏ3量が多い鉄鉱石を製鉄原料として多量に使用せざるを得ない状況にある中で、炉内反応に対するＡｌ2Ｏ3の悪影響を抜本的に解消する技術が求められている。 Therefore, currently, among others in large quantities using forced situation the amount of Al 2 O 3 is large iron ore gangue component as iron raw material drastically the adverse effects of Al 2 O 3 with respect to the furnace reaction There is a need for technology to solve this problem.
本発明は、上記要望に鑑み、高炉内の還元反応に及ぼすアルミナ（Ａｌ2Ｏ3）の影響を抜本的に解消することを課題とし、該課題を解決し、脈石成分としてアルミナ（Ａｌ2Ｏ3）を多量に含む低品位鉄鉱石（以下「高Ａｌ2Ｏ3鉄鉱石」ということがある。）を製鉄原料として有効に活用することができる高炉操業方法を提供することを目的とする。 In view of the above-mentioned demands, the present invention has an object to drastically eliminate the influence of alumina (Al 2 O 3 ) on the reduction reaction in the blast furnace, solves the problem, and uses alumina (Al 2 as a gangue component). It is an object to provide a blast furnace operating method capable of effectively utilizing low grade iron ore containing a large amount of O 3 ) (hereinafter sometimes referred to as “high Al 2 O 3 iron ore”) as a raw material for iron making. .
本発明者らは、上記課題を解決する手法について鋭意検討した。焼結鉱中のＡｌ2Ｏ3は、還元過程で、酸化鉄類（ヘマタイトやマグネタイト、カルシウムフェライト）が還元されて生成したＦｅＯ（ウスタイト）、カルシオウスタイト等と結合して、低融点融液を生成する。 The present inventors diligently studied a method for solving the above problems. Al 2 O 3 in the sintered ore is combined with FeO (wustite), calcioustite, etc. produced by reduction of iron oxides (hematite, magnetite, calcium ferrite) during the reduction process. Is generated.
還元過程における低融点融液の存在が、荷重による充填層の収縮（粒子間の空隙のつぶれ）や、融液の浸透による気孔の閉塞を助長して、焼結鉱の高温での被還元性や、溶融軟化特性が悪化する。ここに、低融点融液の生成開始温度は約１１００℃近辺である。 The presence of the low melting point melt during the reduction process contributes to the shrinkage of the packed bed due to load (collapse of voids between particles) and the clogging of pores due to the penetration of the melt. In addition, the melt softening properties deteriorate. Here, the production start temperature of the low-melting melt is about 1100 ° C.
一方、非焼成含炭塊成鉱を製鉄原料として用いた場合、非焼成含炭塊成鉱は、還元過程で、共存カーボンの作用により、還元が急速に進行し、１１００℃で完了する。 On the other hand, when the non-fired carbon-containing agglomerated mineral is used as an iron-making raw material, the reduction proceeds rapidly by the action of the coexisting carbon in the reduction process and is completed at 1100 ° C.
本発明者らは、低融点融液の生成開始温度、及び、非焼成含炭塊成鉱の還元完了温度がともに１１００℃である点に着目し、「１１００℃で還元が完了する非焼成含炭塊成鉱の内部では、Ａｌ2Ｏ3による融液生成に起因する悪影響は発現しない」と発想した。 The inventors focused on the fact that the low melting point melt generation start temperature and the non-fired carbon-containing agglomerated reduction completion temperature are both 1100 ° C. Inside the coal agglomerated ore, there was no negative effect due to the melt formation by Al 2 O 3 ”.
そこで、本発明者らは、上記発想のもと、非焼成含炭塊成鉱に高Ａｌ2Ｏ3鉄鉱石を配合して、Ａｌ2Ｏ3量の異なる非焼成含炭塊成鉱を製造し、その還元挙動を調査した。調査の詳細については、後述する。 Accordingly, the present inventors, based on the above idea, produce non-fired carbon-containing agglomerated minerals with different amounts of Al 2 O 3 by blending high Al 2 O 3 iron ore with non-fired carbon-containing agglomerated minerals. The reduction behavior was investigated. Details of the survey will be described later.
その結果、非焼成含炭塊成鉱を用いる高炉操業において、Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石を、非焼成含炭塊成鉱の配合原料として３０〜１００ｋｇ／ｔｐ配合（傾斜配合）すると、高炉原料の還元効率を高めて、高Ａｌ2Ｏ3鉄鉱石を使用する条件下でも、還元材比を低減できることを見いだした。 As a result, in blast furnace operation using unfired carbon-containing agglomerated minerals, iron ore containing 2.0% by mass or more of Al 2 O 3 is blended as a raw material for non-fired carbon-containing agglomerated minerals at 30 to 100 kg / tp. It has been found that (inclined blending), the reduction efficiency of the blast furnace raw material can be increased, and the reducing material ratio can be reduced even under conditions where high Al 2 O 3 iron ore is used.
本発明は、上記知見に基づいてなされたもので、その要旨は以下のとおりである。 This invention was made | formed based on the said knowledge, and the summary is as follows.
（１）高アルミナ鉄鉱石（Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石）を、焼結鉱として使用している高炉操業において、当該高アルミナ鉄鉱石を、非焼成含炭塊成鉱の配合原料として傾斜配合して、３０〜１００ｋｇ／ｔｐの範囲で使用することを特徴とする非焼成含炭塊成鉱を用いる高炉操業方法。 (1) high alumina iron ore (iron ore the Al 2 O 3 containing not less than 2.0 mass%), the blast furnace operation that uses a sintered ore, the high alumina iron ore, non-calcined carbonaceous mass A method for operating a blast furnace using a non-fired carbon-containing agglomerated mineral, which is used in a range of 30 to 100 kg / tp by being blended with a gradient as a blended raw material of the ore.
（２）前記非焼成含炭塊成鉱のＣ量が１０〜３５質量％であることを特徴とする前記（１）に記載の非焼成含炭塊成鉱を用いる高炉操業方法。 (2) The blast furnace operation method using the non-fired carbon-containing agglomerated mineral according to (1), wherein the C amount of the non-fired carbon-containing agglomerated mineral is 10 to 35% by mass.
（３）前記非焼成含炭塊成鉱のバインダー配合量が５〜１０質量％であることを特徴とする前記（１）又は（２）に記載の非焼成含炭塊成鉱を用いる高炉操業方法。 (3) A blast furnace operation using the unfired carbon-containing agglomerated mineral as described in (1) or (2) above, wherein the binder content of the unfired carbon-containing agglomerated mineral is 5 to 10% by mass. Method.
（４）前記高アルミナ鉄鉱石を、事前に、１ｍｍ以下の割合が９０％となるように、破砕及び／又は整粒することを特徴とする前記（１）〜（３）のいずれかに記載の非焼成含炭塊成鉱を用いる高炉操業方法。 (4) The high alumina iron ore is crushed and / or sized so that a ratio of 1 mm or less is 90% in advance, according to any one of (1) to (3), Blast furnace operation method using non-calcined carbon-containing agglomerates.
本発明によれば、高Ａｌ2Ｏ3鉄鉱石が高炉内の還元反応に及ぼす悪影響を抜本的に解消することができ、さらに、非焼成含炭塊成鉱の含炭効果が重畳するので、低品位資源の活用と、還元材比（コークス比）の低減を達成することができる。また、本発明によれば、製鉄プロセスにおいて、省エネルギー、低ＣＯ2化が可能となる他、発生したダストを、製鉄原料及び炭材として再利用できる。 According to the present invention, the adverse effect of high Al 2 O 3 iron ore on the reduction reaction in the blast furnace can be drastically eliminated, and furthermore, the carbonation effect of the unfired carbon-containing agglomerated ore is superimposed, Utilization of low-grade resources and reduction of reducing material ratio (coke ratio) can be achieved. Further, according to the present invention, in the iron making process, energy saving and low CO 2 can be achieved, and generated dust can be reused as an iron making raw material and a carbonaceous material.
本発明者らは、非焼成含炭塊成鉱に高Ａｌ2Ｏ3鉄鉱石を配合して、Ａｌ2Ｏ3量の異なる非焼成含炭塊成鉱を製造し、その還元挙動を調査した。 The present inventors blended high-Al 2 O 3 iron ore with unfired carbon-containing agglomerated minerals to produce non-fired carbon-containing agglomerated minerals with different amounts of Al 2 O 3 and investigated their reduction behavior. .
非焼成含炭塊成鉱は、製鉄原料、含Ｃ原料、及び、セメント５％を粉砕、混合し、成形後、所定期間養生して製造した。製造の際、Ａｌ2Ｏ3を２．６質量％含有する高Ａｌ2Ｏ3鉄鉱石（例：ローブリバー）を、０〜５０質量％の範囲で配合した。Ｃ量は、Ｔ.Ｃ（全炭素分析）で２５質量％とした。 The non-fired carbon-containing agglomerated mineral was produced by pulverizing and mixing an iron-making raw material, a C-containing raw material, and cement 5%, and after curing, curing for a predetermined period. During production, the high Al 2 O 3 iron ore containing Al 2 O 3 2.6 wt% (e.g. Robe River) were blended in a range of 0 to 50 wt%. The amount of C was 25 mass% in TC (total carbon analysis).
図１に、高Ａｌ2Ｏ3鉄鉱石の配合率（質量％）と非焼成含炭塊成鉱の性状との関係を示す。図１（ａ）に示すように、非焼成含炭塊成鉱のＡｌ2Ｏ3量は、２．５〜２．９質量％の範囲で変化した。なお、非焼成含炭塊成鉱のＡｌ2Ｏ3量は、製鉄原料中の脈石成分、含カーボン原料中の灰分、セメント中成分に由来する。 Figure 1 shows the relationship between the high-Al 2 O 3 content rate of iron ore and (mass%) and the properties of non-calcined carbonaceous mass Naruko. As shown in FIG. 1 (a), Al 2 O 3 amount of non-calcined carbonaceous mass Naruko varied in the range of 2.5 to 2.9 wt%. The amount of Al 2 O 3 in the unfired carbon-containing agglomerated mineral is derived from the gangue component in the iron-making raw material, the ash in the carbon-containing raw material, and the component in the cement.
Ａｌ2Ｏ3量の異なる非焼成含炭塊成鉱の還元性状を評価した。測定装置は、一般的な荷重軟化試験装置である。試料５００ｇを黒鉛ルツボ内に装入し、荷重を１ｋｇ／ｃｍ2かけながら、下方から還元ガスを流通させ、電気炉で加熱した。加熱パターンは、室温〜１０００℃：１０℃／分、１０００〜１６００℃：５℃／分である。 The reducing properties of unfired carbon-containing agglomerated minerals with different amounts of Al 2 O 3 were evaluated. The measuring device is a general load softening test device. 500 g of a sample was placed in a graphite crucible, and a reducing gas was circulated from below while applying a load of 1 kg / cm 2 and heated in an electric furnace. The heating pattern is room temperature to 1000 ° C .: 10 ° C./min, 1000 to 1600 ° C .: 5 ° C./min.
ＣＯ３０％−Ｈ2５％−Ｎ2６５％の還元ガスを、８００〜１６００℃の範囲で流通させた。試験中の排ガス分析値から除去酸素を算出して、還元率を評価した。図１（ｂ）に、高Ａｌ2Ｏ3鉄鉱石の配合率（質量％）と１２００℃還元率（％）の関係を示す。 A reducing gas of CO 30% -H 2 5% -N 2 65% was circulated in the range of 800 to 1600 ° C. The removal oxygen was calculated from the exhaust gas analysis value during the test, and the reduction rate was evaluated. FIG. 1B shows the relationship between the blending ratio (mass%) of the high Al 2 O 3 iron ore and the 1200 ° C. reduction ratio (%).
図１（ａ）に示すように、高Ａｌ2Ｏ3鉄鉱石を配合することにより、非焼成含炭塊成鉱のＡｌ2Ｏ3量は上昇するが、図１（ｂ）に示すように、非焼成含炭塊成鉱の還元率に変化はなく、いずれの非焼成含炭塊成鉱においても、１２００℃で還元がほぼ完了していることが解る。 As shown in FIG. 1 (a), by adding high Al 2 O 3 iron ore, the amount of Al 2 O 3 in the unfired carbon-containing agglomerated ore increases, but as shown in FIG. 1 (b). It can be seen that there is no change in the reduction rate of the unfired carbon-containing agglomerated mineral, and that the reduction is almost completed at 1200 ° C. in any unfired carbon-containing agglomerated mineral.
さらに、高Ａｌ2Ｏ3鉄鉱石を２０質量％配合して実機で製造した焼結鉱（単味の還元率は６４％）に、２０質量％の非焼成含炭塊成鉱を均一に混合した場合の１２００℃還元率も評価した。結果を図１（ｂ）に示す。この場合も、非焼成含炭塊成鉱中のＡｌ2Ｏ3の悪影響は検出されなかった。 Furthermore, 20% by mass of non-calcined carbon-containing agglomerated ore is uniformly mixed with sintered ore (solid reduction rate of 64%) manufactured with actual equipment by blending 20% by mass of high Al 2 O 3 iron ore. The reduction rate at 1200 ° C. was also evaluated. The results are shown in FIG. Also in this case, no adverse effect of Al 2 O 3 in the unfired carbon-containing agglomerated mineral was detected.
参考のため、高Ａｌ2Ｏ3鉄鉱石を０〜５０質量％の範囲で変化させて配合し、実機で焼結鉱を製造した。高Ａｌ2Ｏ3鉄鉱石の配合量に応じ、焼結鉱のＡｌ2Ｏ3量は１．６〜２．５質量％の範囲で変化した。また、強度や、歩留を維持するため、同時に、コークスも増量したので、焼結鉱のＦｅＯ量は、６．０〜９．０質量％の範囲で変化した。 For reference, high Al 2 O 3 iron ore was mixed in a range of 0 to 50% by mass, and sintered ore was produced using an actual machine. Depending on the blending amount of the high Al 2 O 3 iron ore, the Al 2 O 3 content of the sintered ore changed in the range of 1.6 to 2.5% by mass. Moreover, since coke was increased at the same time in order to maintain strength and yield, the amount of FeO in the sintered ore changed in the range of 6.0 to 9.0% by mass.
図１（ｂ）に、焼結鉱単味の場合の１２００℃還元率を示すが、この場合、高Ａｌ2Ｏ3鉄鉱石の配合により、１２００℃還元率が低下することが解る。 FIG. 1B shows the 1200 ° C. reduction rate in the case of a simple sinter. In this case, it can be seen that the reduction rate of 1200 ° C. is reduced by the blending of the high Al 2 O 3 iron ore.
ここで、図２に、高Ａｌ2Ｏ3鉄鉱石を５０質量％配合した非焼成含炭塊成鉱の還元の進行状況と、同じく、高Ａｌ2Ｏ3鉄鉱石を５０質量％配合した焼結鉱の還元の進行状況を、対比して示す。図２から、非焼成含炭塊成鉱の場合、１１００℃付近で還元が進行しているのに対して、焼結鉱の場合、還元が遅く、１１００〜１２００℃付近で還元が遅延していることが解る。 Here, FIG. 2 shows the progress of the reduction of the unfired carbon-containing agglomerated mineral containing 50% by mass of high Al 2 O 3 iron ore, and similarly, the sintering of 50% by mass of high Al 2 O 3 iron ore. The progress of reduction of the ore is shown in comparison. From FIG. 2, in the case of unfired carbon-containing agglomerated minerals, the reduction proceeds at around 1100 ° C., whereas in the case of sintered ore, the reduction is slow and the reduction is delayed around 1100-1200 ° C. I understand that
そこで、還元の遅速を確認するため、還元途中の非焼成含炭塊成鉱及び焼結鉱（実機製造）の断面ミクロ組織を、還元中断試験（中断温度１１００℃）で解析した。解析結果を図３に示す。 Therefore, in order to confirm the slow speed of reduction, the cross-sectional microstructures of unfired carbon-containing agglomerated or sintered ore (actual machine production) during reduction were analyzed by a reduction interruption test (interruption temperature 1100 ° C.). The analysis results are shown in FIG.
図３（ａ）に、高Ａｌ2Ｏ3鉄鉱石を５０質量％配合した非焼成含炭塊成鉱の断面ミクロ組織を示し、図３（ｂ）に、同じく、高Ａｌ2Ｏ3鉄鉱石を５０質量％配合した焼結鉱（実機製造）の断面ミクロ組織を示す。 FIG. 3 (a) shows a cross-sectional microstructure of an unfired carbon-containing agglomerated mineral containing 50% by mass of high Al 2 O 3 iron ore, and FIG. 3 (b) shows the same high Al 2 O 3 iron ore. The cross-sectional microstructure of the sintered ore (actual machine manufacture) which mix | blended 50 mass% was shown.
図３（ａ）に示すように、非焼成含炭塊成鉱のミクロ組織は、小粒のメタル（白色部分）から構成されており、この時点（中断温度１１００℃）で、還元がかなり進行していることが解る。また、図３（ａ）に示すミクロ組織には、空隙（黒色部分）が多数存在していて、この時点（中断温度１１００℃）で、融液が全く生成していないことが解る。 As shown in FIG. 3 (a), the microstructure of the unfired carbon-containing agglomerated mineral is composed of small metal (white portion), and at this point (interruption temperature 1100 ° C.), the reduction proceeds considerably. I understand that Moreover, in the microstructure shown in FIG. 3A, it can be seen that many voids (black portions) exist, and no melt is generated at this point (interruption temperature 1100 ° C.).
一方、図３（ｂ）に示すように、焼結鉱（実機製造）のミクロ組織に、メタル（白色部分）は殆ど観察されず、ウスタイト（灰色部分）段階までの還元に留まっていることが解る。図３（ｂ）に示すミクロ組織において、ウスタイト（灰色部分）粒子は丸みを帯びており、微少な融液が、この段階（中断温度１１００℃）で生成し始めていることが解る。 On the other hand, as shown in FIG. 3 (b), almost no metal (white part) is observed in the microstructure of the sintered ore (actual machine production), and the reduction to the wustite (gray part) stage remains. I understand. In the microstructure shown in FIG. 3 (b), it can be seen that the wustite (gray portion) particles are rounded, and a minute melt starts to form at this stage (interruption temperature 1100 ° C.).
以上の結果から、次ぎのことが判明した。
（ｘ）高Ａｌ2Ｏ3鉄鉱石を非焼成含炭塊成鉱へ配合しても、非焼成含炭塊成鉱の還元特性は、高いまま変化しない。
（y1）高Ａｌ2Ｏ3鉄鉱石を焼結鉱へ配合すると、焼結鉱の還元特性は低下する。
（y2）焼結鉱のＡｌ2Ｏ3量を低減すると、還元特性が改善される。
From the above results, the following was found.
(X) Even if high Al 2 O 3 iron ore is blended with the unfired coal-containing agglomerated ore, the reduction characteristics of the unfired coal-containing agglomerated ore remain high.
(Y1) When high Al 2 O 3 iron ore is blended with sintered ore, the reduction characteristics of the sintered ore are lowered.
(Y2) When the amount of Al 2 O 3 in the sintered ore is reduced, the reduction characteristics are improved.
本発明は、上記知見に基づきなされたもので、高Ａｌ2Ｏ3鉄鉱石を、非焼成含炭塊成鉱へ重点的に配合（傾斜配合）することを基本思想とするものである。 The present invention has been made on the basis of the above knowledge, and has a basic idea of blending high grade Al 2 O 3 iron ore into unfired carbon-containing agglomerated concentrate (gradient blending).
ただし、一般に、高Ａｌ2Ｏ3鉄鉱石は、脈石成分であるカオリナイトを多く含み、酸化鉄もゲーサイト主体のものが多く、結晶水量も高いので、高Ａｌ2Ｏ3鉄鉱石を、非焼成含炭塊成鉱に過度に傾斜配合すると、高炉への結晶水の持込み量が過剰となり、高炉の炉頂温度の低下や、シャフト部での還元遅れを引き起こす。 However, in general, high Al 2 O 3 iron ore rich in kaolinite are gangue components, iron oxide many things goethite entity, the crystal water is high, the high Al 2 O 3 of iron ore, If it is blended excessively into the unfired carbon-containing agglomerated mineral, the amount of crystal water brought into the blast furnace becomes excessive, causing a decrease in the furnace top temperature of the blast furnace and a reduction delay in the shaft portion.
一般に、高炉の炉頂温度が１００℃以下となると、炉頂部で、排ガス中の水分が凝縮し、安定した操業が不可能となるので、炉頂温度は、１２０℃前後を下限として管理されている。また、高Ａｌ2Ｏ3鉄鉱石のＡｌ2Ｏ3量は、ある程度、多くなければならない。高Ａｌ2Ｏ3鉄鉱石のＡｌ2Ｏ3量が少ないと、Ａｌ2Ｏ3の傾斜配合による効果が充分に発現しない。 Generally, when the furnace top temperature of the blast furnace is 100 ° C. or lower, moisture in the exhaust gas is condensed at the furnace top and stable operation becomes impossible. Therefore, the furnace top temperature is controlled around 120 ° C. as the lower limit. Yes. Also, the Al 2 O 3 content of the high Al 2 O 3 iron ore must be large to some extent. When the amount of Al 2 O 3 of high Al 2 O 3 iron ore is small, the effect of the inclination compounding of Al 2 O 3 is not sufficiently exhibited.
そこで、本発明者らは、高炉装入原料としての高Ａｌ2Ｏ3鉄鉱石の最適な使用方法について鋭意検討した。 Therefore, the present inventors diligently studied an optimal method for using the high Al 2 O 3 iron ore as a blast furnace charging raw material.
実機で、高Ａｌ2Ｏ3鉄鉱石の配合量の異なる非焼成含炭塊成鉱と焼結鉱を製造し、高炉に装入した。１ヶ月間の操業結果を平均値で評価した。評価については、実施例で詳述する。 Using the actual machine, unfired carbon-containing agglomerated minerals and sintered ores with different blending amounts of high Al 2 O 3 iron ore were manufactured and charged into the blast furnace. The operation results for one month were evaluated as average values. The evaluation will be described in detail in Examples.
実機による操業結果から、Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石を、焼結鉱として使用している高炉操業において、当該鉄鉱石を非焼成含炭塊成鉱の配合原料として傾斜配合して、３０〜１００ｋｇ／ｔｐ使用すると、還元材比の低い操業を行うことができることが判明した。この点が、本発明の特徴である。 From operation result of actual, the Al 2 O 3 of iron ore containing more than 2.0 mass%, in the blast furnace operation that uses a sintered ore, the iron ore as a blending material for non-calcined carbonaceous mass Naruko It was found that when the mixture is used at an inclination of 30 to 100 kg / tp, an operation with a low reducing material ratio can be performed. This is a feature of the present invention.
即ち、非焼成含炭塊成鉱に、上記使用量の範囲で、高Ａｌ2Ｏ3鉄鉱石を傾斜配合する。非焼成含炭塊成鉱はＣと共存しているので、非焼成含炭塊成鉱内部で急速還元が起き、Ａｌ2Ｏ3量が多くても、還元過程で融液の生成が抑制されて、Ａｌ2Ｏ3による悪影響を解消することができる。 That is, the high Al 2 O 3 iron ore is blended in the non-fired carbon-containing agglomerated ore within the above range of use amount. Since the unfired coal-containing agglomerate coexists with C, rapid reduction occurs inside the unfired coal -containing agglomerate, and even if the amount of Al 2 O 3 is large, the formation of melt is suppressed during the reduction process. Thus, adverse effects due to Al 2 O 3 can be eliminated.
一方、非焼成含炭塊成鉱に、高Ａｌ2Ｏ3鉄鉱石を傾斜配合した分、焼結鉱での使用量を低減するので、焼結鉱のＡｌ2Ｏ3量は低下して、焼結鉱の還元効率も良好となる。 On the other hand, the amount of Al 2 O 3 in the sintered ore is reduced because the amount used in the sintered ore is reduced because the high Al 2 O 3 iron ore is added to the unfired carbon-containing agglomerated slant. The reduction efficiency of the sintered ore is also improved.
このように、高Ａｌ2Ｏ3鉄鉱石を、非焼成含炭塊成鉱と焼結鉱に傾斜配合することにより、高炉に装入するＡｌ2Ｏ3量が、傾斜配合をしない場合と同じであっても、極めて還元効率の高い高炉操業を行うことが可能となる。 In this way, by blending high Al 2 O 3 iron ore into unfired carbon-containing agglomerated ore and sintered ore, the amount of Al 2 O 3 charged into the blast furnace is the same as that without gradient blending. Even so, it becomes possible to perform blast furnace operation with extremely high reduction efficiency.
高アルミナ鉄鉱石のＡｌ2Ｏ3量を、本発明では２．０質量％以上とした。Ａｌ2Ｏ3量が２．０質量％未満であると、平均的な鉄鉱石のＡｌ2Ｏ3量と差がなくなり、そのような鉄鉱石を非焼成含炭塊成鉱の配合原料として３０ｋｇ／ｔｐ以上使用しても、傾斜配合効果が充分に発現しない。 In the present invention, the amount of Al 2 O 3 in the high alumina iron ore is 2.0 mass% or more. When the amount of Al 2 O 3 is less than 2.0% by mass, there is no difference from the average amount of Al 2 O 3 in iron ore, and 30 kg of such iron ore is used as a raw material for non-fired carbon-containing agglomerated minerals. Even if used more than / tp, the gradient blending effect is not sufficiently developed.
Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石の使用量が３０ｋｇ／ｔｐ未満であると、使用量が少なすぎて、傾斜配合効果が充分に発現しない。一方、Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石の使用量が１００ｋｇ／ｔｐを超えると、使用量が多過ぎて、それに伴って増加する結晶水装入量の増大による悪影響が顕著となる。Ａｌ2Ｏ3を２．０質量％以上含有する鉄鉱石の使用量は、好ましくは、５０〜８０ｋｇ／ｔｐである。 If the amount of iron ore containing 2.0% by mass or more of Al 2 O 3 is less than 30 kg / tp, the amount used is too small and the gradient blending effect is not sufficiently exhibited. On the other hand, when the amount of iron ore containing 2.0% by mass or more of Al 2 O 3 exceeds 100 kg / tp, the amount used is too much, and there is an adverse effect due to an increase in the amount of crystal water charged. Become prominent. The amount of iron ore containing 2.0% by mass or more of Al 2 O 3 is preferably 50 to 80 kg / tp.
また、高Ａｌ2Ｏ3鉄鉱石の非焼成含炭塊成鉱への配合は、非焼成含炭塊成鉱の製造過程や成品強度には悪影響を及ぼさず、むしろ、製造過程での生塊成鉱（養生前の塊成鉱）の強度を高める作用がある。 In addition, the blending of high Al 2 O 3 iron ore into the unfired coal-containing agglomerated ore does not adversely affect the production process and product strength of the unfired coal - containing agglomerated ore. It has the effect of increasing the strength of the ore (agglomeration before curing).
これは、高Ａｌ2Ｏ3鉄鉱石には、脈石として、可塑性を持つカオリナイトが多く含有されているためである。上記強度向上効果を最大限に得るために、高Ａｌ2Ｏ3鉄鉱石は、事前に、１ｍｍ以下の割合が９０％以上となるまで、破砕及び／又は整粒することが望ましい。 This is because high Al 2 O 3 iron ore contains a lot of plasticized kaolinite as gangue. In order to obtain the above strength improvement effect to the maximum, it is desirable that the high Al 2 O 3 iron ore is crushed and / or sized in advance until the ratio of 1 mm or less becomes 90% or more.
高Ａｌ2Ｏ3鉄鉱石を、１ｍｍ以下の割合が９０％以上となるまで、破砕及び／又は整粒することにより、付着力の高い高Ａｌ2Ｏ3鉄鉱石が、他の配合原料の粒子間隙に効率良く均一分散されるので、大きな強度向上効果が得られる。 By crushing and / or sizing the high Al 2 O 3 iron ore until the ratio of 1 mm or less reaches 90% or more, the high Al 2 O 3 iron ore having high adhesion strength is converted into particles of other compounding raw materials. Since it is efficiently dispersed uniformly in the gap, a great strength improvement effect can be obtained.
このときの破砕及び／又は整粒する方法は特に限定されるものではない。ボールミル、ローラーミル、ローラープレス等の破砕機を用いることができる。また、整粒機も、振動篩や、ジャンピングスクリーンなどを用いることができる。 The method of crushing and / or sizing at this time is not particularly limited. A crusher such as a ball mill, a roller mill, or a roller press can be used. Moreover, a vibration sieve, a jumping screen, etc. can be used also for a granulator.
なお、本発明では、非焼成含炭塊成鉱の製造に係る条件、及び、高Ａｌ2Ｏ3鉄鉱石以外の製鉄原料に係る配合条件は、特定の条件に限定されない。パンペレタイザーによるペレット成型法や、ブリケットなどの強制成型法を用いても、ほぼ同一の効果を得ることができる。 In the present invention, conditions of production of non-calcined carbonaceous mass Naruko and blending conditions according to the high Al 2 O 3 iron materials other than iron ore is not limited to the specific conditions. Even if a pellet molding method using a pan pelletizer or a forced molding method such as briquette is used, substantially the same effect can be obtained.
非焼成含炭塊成鉱のＣ量は、全原料に対して１０〜３５質量％が望ましい。Ｃ量が、この範囲であれば、酸化鉄との共存による還元材比の低減効果と、高炉への搬送、装入時の粉化に耐え得る冷間強度（圧潰強度で１００ｋｇｆ／個以上）とを、いかなる成型方法でも容易に達成することができる。 The C amount of the unfired carbon-containing agglomerated mineral is desirably 10 to 35% by mass with respect to the total raw materials. If the amount of C is within this range, the reducing material ratio is reduced by coexistence with iron oxide, and the cold strength that can withstand pulverization during transportation to and from the blast furnace (crushing strength of 100 kgf / piece or more) Can be easily achieved by any molding method.
バインダー配合量は、それを含む全原料に対して５〜１０質量％が望ましい。この範囲であれば、前記冷間強度を容易に達成することができるとともに、過剰なスラグ成分の持ち込みもないので、高炉の安定操業が容易である。 The binder blending amount is desirably 5 to 10% by mass with respect to all raw materials including the binder. Within this range, the cold strength can be easily achieved, and since no excessive slag component is brought in, stable operation of the blast furnace is easy.
高Ａｌ2Ｏ3鉄鉱石に多量の結晶水が存在する場合は、成形処理を行うに先だって、予め、加熱によって、３質量％以下まで脱水する。この脱水で、高Ａｌ2Ｏ3鉄鉱石に由来する結晶水の高炉装入量が低減されて、炉頂温度の低下が抑制されるので、高炉操業上好ましい。なお、結晶水が３質量％を超えると、脱水処理を施しても、炉頂温度はそれほど変化しない。 When a large amount of crystallization water is present in the high Al 2 O 3 iron ore, it is dehydrated to 3% by mass or less in advance by heating prior to the forming treatment. This dehydration reduces the amount of blast furnace charge of crystal water derived from the high Al 2 O 3 iron ore and suppresses the decrease in the furnace top temperature, which is preferable for blast furnace operation. In addition, when crystal water exceeds 3 mass%, even if it performs a dehydration process, furnace top temperature will not change so much.
脱水処理手段は、特に限定されない。脱水装置として、シャフト炉、回転炉床、流動層、ロータリーキルン炉などを用いることができる。熱源として、焼結本体や、焼結クーラー排熱など、製鉄所内で発生する熱源を利用すれば、より安価に脱水処理を行うことができる。また、山元から出荷する前に、天燃ガスなどを熱源として脱水すれば、船による搬送費用を軽減できるので好ましい。 The dehydrating means is not particularly limited. As the dehydrator, a shaft furnace, a rotary hearth, a fluidized bed, a rotary kiln furnace, or the like can be used. If a heat source generated in the steel works such as a sintered body or a sintered cooler exhaust heat is used as a heat source, dehydration can be performed at a lower cost. In addition, it is preferable to dehydrate using natural gas or the like as a heat source before shipping from the mountain, since the transportation cost by ship can be reduced.
なお、通常、鉄鉱石に、このような脱水処理を施すと、鉄鉱石が粉化してしまい、焼結での使用時に、造粒性の悪化による通気性、及び／又は、生産性の低下を伴うが、本発明で、鉄鉱石は、脱水処理後、非焼成含炭塊成鉱の原料に供されるので、粉化、微粉化することは、非焼成含炭塊成鉱の製造上、成型性の向上をもたらすので、むしろ好ましい。 Normally, when such dehydration treatment is applied to iron ore, the iron ore is pulverized, and when used in sintering, air permeability and / or productivity decrease due to deterioration of granulation property. However, in the present invention, iron ore is used as a raw material for non-fired coal-containing agglomerated minerals after dehydration, so that pulverization and pulverization are not This is preferable because it improves the moldability.
次に、本発明の実施例について説明するが、実施例での条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。 Next, examples of the present invention will be described. The conditions in the examples are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
（実施例）
実機で、高Ａｌ2Ｏ3鉄鉱石の配合量の異なる非焼成含炭塊成鉱と焼結鉱を製造し、高炉に装入した。高Ａｌ2Ｏ3鉄鉱石には、Ａｌ2Ｏ3含有量が２．６５質量％のローブリバー鉱石を用いた。１ヶ月間の操業結果を平均値で評価した結果を表１に示す。使用量は、高炉で製造する溶銑１トンあたりの使用量（ｋｇ/ｔｐ）で記載した。
(Example)
Using the actual machine, unfired carbon-containing agglomerated minerals and sintered ores with different blending amounts of high Al 2 O 3 iron ore were manufactured and charged into the blast furnace. As the high Al 2 O 3 iron ore, a lobe river ore having an Al 2 O 3 content of 2.65% by mass was used. Table 1 shows the results of evaluating the operation results for one month with average values. The amount used was described as the amount used (kg / tp) per ton of hot metal produced in a blast furnace.
ここに、非焼成含炭塊成鉱は、１ｍｍ以下９０質量％以上に粉砕したローブリバー鉱石、１ｍｍ以下９０質量％以上に粉砕した無煙炭で表１に示す所定のＣ量となる配合量分、８質量％のポルトランドセメントとを配合して塊成化したもので、いずれも、高炉使用に耐え得る１００ｋｇｆ／個以上を発現した。 Here, the unfired carbon - containing agglomerated mineral is a lobe river ore crushed to 1 mm or less and 90% by mass or more, an anthracite pulverized to 1 mm or less and 90% by mass or more, and a blending amount corresponding to a predetermined C amount shown in Table 1, These were agglomerated by blending with 8% by mass of Portland cement, and all expressed 100 kgf / piece or more that could withstand blast furnace use.
比較例１では、非焼成含炭塊成鉱を使用せず、高Ａｌ2Ｏ3鉄鉱石は、焼結鉱のみに配合しているので、装入物の還元率（１２００℃還元率）は低く、還元材比（inputＣ）が高い操業となった。 In Comparative Example 1, the non-fired carbon-containing agglomerated ore was not used, and the high Al 2 O 3 iron ore was blended only in the sintered ore, so the reduction rate of the charge (1200 ° C. reduction rate) was The operation was low and the reducing material ratio (input C) was high.
比較例２では、非焼成含炭塊成鉱を５０ｋｇ／ｔｐ使用したが、高Ａｌ2Ｏ3鉄鉱石を配合していないので、還元率は高くなったものの、還元材比の低減効果は限定され、４００ｋｇ/ｔｐに留まった。 In Comparative Example 2, 50 kg / tp of uncalcined carbon-containing agglomerated ore was used, but since the high Al 2 O 3 iron ore was not blended, the reduction rate was high, but the reduction effect of the reducing material ratio was limited. And remained at 400 kg / tp.
なお、還元材比は、一般的には、装入コークス量と微粉炭吹き込み量の合計で表すが、ここでは、非焼成含炭塊成鉱中に含有されるカーボンも含めた溶銑１トン当りの消費カーボン量（ｋｇＣ／ｔｐ）として評価した。 The ratio of reducing material is generally expressed as the sum of the amount of charged coke and the amount of pulverized coal injected, but here, per 1 ton of hot metal including carbon contained in the unfired carbon-containing agglomerated ore. The amount of carbon consumed (kgC / tp) was evaluated.
発明例１では、高Ａｌ2Ｏ3鉄鉱石（Ａｌ2Ｏ3量：２．６５質量％）を、３２ｋｇ／ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を下げ、低Ａｌ2Ｏ3量とした。 In Invention Example 1, high Al 2 O 3 iron ore (Al 2 O 3 content: 2.65% by mass) is used in 32 kg / tp, non-calcined carbon-containing agglomerated minerals. The blending amount of high Al 2 O 3 iron ore was lowered to a low Al 2 O 3 amount.
その結果、高炉での高Ａｌ2Ｏ3鉄鉱石原単位、及び、Ａｌ2Ｏ3原単位は、比較例２と同じであるにもかかわらず、還元率が向上して、還元材比を３９２ｋｇ／ｔｐまで低減できた。 As a result, although the high Al 2 O 3 iron ore basic unit and Al 2 O 3 basic unit in the blast furnace were the same as those in Comparative Example 2, the reduction rate was improved, and the reducing material ratio was 392 kg / It was reduced to tp.
発明例２では、高Ａｌ2Ｏ3鉄鉱石を、６５ｋｇ／ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を大幅に下げ、さらに、低Ａｌ2Ｏ3量とした。 In Invention Example 2, high Al 2 O 3 iron ore is used in 65 kg / tp, non-calcined carbon-containing agglomerate, and the amount of high Al 2 O 3 iron ore in the sintered ore is greatly increased accordingly. Further, the amount of Al 2 O 3 was reduced.
その結果、高炉での高Ａｌ2Ｏ3鉄鉱石原単位、及び、Ａｌ2Ｏ3原単位は、比較例２と同じであるにもかかわらず、還元率が向上して、還元材比をさらに低減できた。高Ａｌ2Ｏ3鉄鉱石の配合量の傾斜を、発明例１の場合よりも大きくしたので、傾斜配合の効果は、本発明１の場合よりも大きかった。 As a result, although the high Al 2 O 3 iron ore unit and the Al 2 O 3 basic unit in the blast furnace are the same as those in Comparative Example 2, the reduction rate is improved and the reducing material ratio is further reduced. did it. Since the slope of the blending amount of the high Al 2 O 3 iron ore was made larger than that in the case of Invention Example 1, the effect of the slope blending was greater than that in the case of Invention 1.
発明例３では、高Ａｌ2Ｏ3鉄鉱石を、９８ｋｇ／ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を大幅に下げ、さらに、低Ａｌ2Ｏ3量とした。 In Invention Example 3, high Al 2 O 3 iron ore was used in 98 kg / tp, non-calcined carbon-containing agglomerate, and the amount of high Al 2 O 3 iron ore in the sintered ore was greatly increased accordingly. Further, the amount of Al 2 O 3 was reduced.
その結果、高炉での高Ａｌ2Ｏ3鉄鉱石原単位、及び、Ａｌ2Ｏ3原単位は、比較例２と同じであるにもかかわらず、還元率が大幅に向上して、還元材比が大幅に低減した。高Ａｌ2Ｏ3鉄鉱石の配合量の傾斜を最も大きくしたので、発明例１及び２の場合と比べて、傾斜配合の効果は、最も大きかった。 As a result, although the high Al 2 O 3 iron ore unit and the Al 2 O 3 basic unit in the blast furnace are the same as those in Comparative Example 2, the reduction rate is greatly improved, and the reducing material ratio is increased. Significantly reduced. Since the gradient of the blending amount of the high Al 2 O 3 iron ore was maximized, the effect of the gradient blending was the greatest as compared with Examples 1 and 2.
発明例４では、高Ａｌ2Ｏ3鉄鉱石を、６５ｋｇ／ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を大幅に下げ、さらに、低Ａｌ2Ｏ3量とした。高炉での高Ａｌ2Ｏ3鉄鉱石原単位、及び、Ａｌ2Ｏ3原単位は、発明例２と同じであり、発明例２の場合と同程度の効果が得られている。 In Invention Example 4, high Al 2 O 3 iron ore is used at 65 kg / tp, uncalcined carbon-containing agglomerate, and the amount of high Al 2 O 3 iron ore in the sintered ore is greatly increased accordingly. Further, the amount of Al 2 O 3 was reduced. The high Al 2 O 3 iron ore basic unit and Al 2 O 3 basic unit in the blast furnace are the same as those of Invention Example 2, and the same effects as those of Invention Example 2 are obtained.
発明例５では、高Ａｌ2Ｏ3鉄鉱石を、６５ｋｇ／ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を大幅に下げ、さらに、低Ａｌ2Ｏ3量とした。高炉での高Ａｌ2Ｏ3鉄鉱石原単位、及び、Ａｌ2Ｏ3原単位は、発明例２と同じであり、発明例２の場合と同程度の効果が得られている。 In Invention Example 5, high Al 2 O 3 iron ore is used at 65 kg / tp, uncalcined carbon-containing agglomerate, and the amount of high Al 2 O 3 iron ore in the sintered ore is greatly increased accordingly. Further, the amount of Al 2 O 3 was reduced. The high Al 2 O 3 iron ore basic unit and Al 2 O 3 basic unit in the blast furnace are the same as those of Invention Example 2, and the same effects as those of Invention Example 2 are obtained.
比較例３では、高Ａｌ2Ｏ3鉱石を、２８ｋｇ/ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を下げ、低Ａｌ2Ｏ3量とした。その結果、還元率は向上したが、高Ａｌ2Ｏ3鉄鉱石の傾斜配合が不十分であったので、還元材比は３９９ｋｇ／ｔｐに留まり、発明例１ほどの顕著な還元材比低減効果は得られなかった。 In Comparative Example 3, high Al 2 O 3 ore was used at 28 kg / tp, uncalcined carbon-containing agglomerate, and the amount of high Al 2 O 3 iron ore in the sintered ore was reduced accordingly, The amount of Al 2 O 3 was used. As a result, although the reduction rate was improved, since the gradient blending of high Al 2 O 3 iron ore was insufficient, the reducing material ratio remained at 399 kg / tp, and the remarkable reducing material ratio reducing effect as in Invention Example 1 was achieved. Was not obtained.
比較例４では、高Ａｌ2Ｏ3鉄鉱石（Ａｌ2Ｏ3量：２．６５質量％）を、１０２ｋｇ/ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での高Ａｌ2Ｏ3鉄鉱石の配合量を大幅に下げ、低Ａｌ2Ｏ3量とした。 In Comparative Example 4, high Al 2 O 3 iron ore (Al 2 O 3 content: 2.65% by mass) was used in 102 kg / tp, non-calcined carbon-containing agglomerated mineral, and accordingly, in the sintered ore. The blending amount of high Al 2 O 3 iron ore was greatly reduced to a low Al 2 O 3 amount.
その結果、還元率は大幅に向上したが、非焼成含炭塊成鉱から高炉に持ち込まれる結晶水量が過剰になり、炉頂温度１２０℃を維持することが困難であった。過剰な結晶水によるシャフト部での還元遅れも顕在化して、還元材比は４０３ｋｇ／ｔｐと高かった。 As a result, although the reduction rate was greatly improved, the amount of crystal water brought into the blast furnace from the unfired carbon-containing agglomerated mineral became excessive, and it was difficult to maintain the furnace top temperature of 120 ° C. The reduction delay in the shaft portion due to excessive crystallization water also became apparent, and the reducing material ratio was as high as 403 kg / tp.
比較例５は、ローブリバー鉱石とカラジヤス鉱石を混合して、Ａｌ2Ｏ3量を１．９０質量％に調整した原料を、１００ｋｇ/ｔｐ、非焼成含炭塊成鉱で使用し、その分、焼結鉱での当該鉄鉱石の配合量を大幅に下げた。しかし、上記鉄鉱石のＡｌ2Ｏ3量が十分多くなく、焼結鉱の低Ａｌ2Ｏ3量化には限度があった。 Comparative Example 5 uses a raw material prepared by mixing lobe river ore and calajiyas ore and adjusting the amount of Al 2 O 3 to 1.90% by mass in 100 kg / tp, unfired carbon-containing agglomerated ore. The amount of iron ore in the sintered ore has been greatly reduced. However, no sufficiently many amount of Al 2 O 3 of the iron ore, the low Al 2 O 3 dimerization of sinter had limits.
その結果、還元率の向上は小さく、非焼成含炭塊成鉱から高炉に持ち込まれる結晶水量の増大だけが大きくなり、還元材比は、３９６ｋｇ／ｔｐと、充分な低減効果は得られなかった。 As a result, the improvement of the reduction rate was small, and only the increase in the amount of crystallization water brought into the blast furnace from the unfired coal-containing agglomerated ore was large, and the reduction ratio was 396 kg / tp, and a sufficient reduction effect was not obtained. .
前述したように、本発明によれば、高Ａｌ2Ｏ3鉄鉱石が高炉内の還元反応に及ぼす悪影響を抜本的に解消することができ、さらに、非焼成含炭塊成鉱の含炭効果が重畳するので、低品位資源の活用と、還元材比（コークス比）の低減を達成することができる。また、本発明によれば、製鉄プロセスにおいて、省エネルギー、低ＣＯ2化が可能となる他、発生したダストを、製鉄原料及び炭材として再利用できる。 As described above, according to the present invention, the adverse effect of the high Al 2 O 3 iron ore on the reduction reaction in the blast furnace can be drastically eliminated, and further, the carbonation effect of the unfired carbon-containing agglomerated ore. Therefore, utilization of low-grade resources and reduction of the reducing material ratio (coke ratio) can be achieved. Further, according to the present invention, in the iron making process, energy saving and low CO 2 can be achieved, and generated dust can be reused as an iron making raw material and a carbonaceous material.
よって、本発明は、工業的及び社会的に貢献するとことが多大で、鉄鋼産業において利用可能性が高いものである。 Therefore, the present invention greatly contributes industrially and socially and has high applicability in the steel industry.
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