JPH06212294A - Production of sintered ore - Google Patents

Production of sintered ore

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Publication number
JPH06212294A
JPH06212294A JP1782893A JP1782893A JPH06212294A JP H06212294 A JPH06212294 A JP H06212294A JP 1782893 A JP1782893 A JP 1782893A JP 1782893 A JP1782893 A JP 1782893A JP H06212294 A JPH06212294 A JP H06212294A
Authority
JP
Japan
Prior art keywords
raw material
layer
cao
sintered
sio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1782893A
Other languages
Japanese (ja)
Inventor
Masami Fujimoto
政美 藤本
Tadahiro Inasumi
忠弘 稲角
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP1782893A priority Critical patent/JPH06212294A/en
Publication of JPH06212294A publication Critical patent/JPH06212294A/en
Pending legal-status Critical Current

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  • Manufacture And Refinement Of Metals (AREA)

Abstract

PURPOSE:To improve the yield of the front layer of a sintered layer in production of the sintered ore by charging a high-CaO/SiO2 raw material having a specific compsn. into the front layer of the packed layer of the raw material to be sintered, igniting the raw material and sucking the material downward, thereby sintering the raw material. CONSTITUTION:The raw material to be sintered consisting of ore which is a main material, limestone which is an auxiliary raw material and coke and returns which are fuel is supplied into a downward suction type sintering machine. The high-CaO/SiO2 raw material of 2.3 to 3.6 CaO/SiO2 is supplied into the front layer of the sintering packed layer at this time. A carbonaceous material may be added at need to the high-CaO/SiO2 raw material to improve the ignitability of the mentioned above front surface. The front layer of the packed layer is thereafter ignited and is sintered. As a result, the strength of the sintering front layer is increased and the yield is improved. In addition, a favourable influence is exerted on the middle and lower layers corresponding thereto as well and the yield over the entire part of the sintering layer is improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、高炉等で製銑するに際
して原料となる焼結鉱の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered ore which is a raw material for iron making in a blast furnace or the like.

【０００２】[0002]

【従来の技術】従来の焼結鉱の製造方法の例の概略工程
を図４に示す。2. Description of the Related Art FIG. 4 shows a schematic process of an example of a conventional method for producing a sintered ore.

【０００３】主原料の鉱石は鉱石ホッパー９、副原料で
ある石灰石は石灰石ホッパー８、燃料であるコークスは
コークスホッパー６、返鉱は返鉱ホッパー７からそれぞ
れ所定量切り出し、これにミキサー１０で水分を添加
し、調湿造粒する。水分の添加量は６．５〜７．０％の
範囲である。Ore hopper 9 is the main raw material, limestone hopper 8 is the auxiliary raw material, limestone hopper 8 is the auxiliary raw material, coke hopper 6 is the coke which is the fuel, and return hopper 7 is the return mine. Is added and subjected to humidity conditioning granulation. The amount of water added is in the range of 6.5 to 7.0%.

【０００４】コークスを含有している焼結原料１はサー
ジホッパー２に一旦装入し、ドラムフィーダー３から切
り出し、シュート４を介してパレット１２に装入して充
填層５を形成する。この充填層５の層厚は６００ｍｍで
ある。The sintering raw material 1 containing coke is once charged into a surge hopper 2, cut out from a drum feeder 3, and charged into a pallet 12 through a chute 4 to form a packed layer 5. The layer thickness of this filling layer 5 is 600 mm.

【０００５】充填層５の表層部分のコークスに点火炉１
１で点火して下方に空気を吸引しながらコークスを燃焼
させ、この燃焼熱で上層から下層にかけて順次原料を焼
結する。The ignition furnace 1 is installed in the coke on the surface of the packed bed 5.
The coke is burned while igniting at 1 and sucking air downward, and the combustion heat sinters the raw materials sequentially from the upper layer to the lower layer.

【０００６】[0006]

【発明が解決しようとする課題】焼結表層は、中層、下
層のように焼結進行帯の高温赤熱部を通過した高温空気
によりコークスが燃焼するのではなく、吸引冷空気によ
りコークスが燃焼するので燃焼温度が高くならず、十分
に焼結されないので強度の小さい焼結鉱となる。中層、
下層の強度も焼結表層の不十分な焼結の影響を受けるの
で十分ではなく、全層に渡って強度の小さい焼結鉱とな
る傾向がある。このため破砕整粒時に細粒が多くなり、
歩留が低下する問題がある。In the sintered surface layer, unlike the middle layer and the lower layer, the coke is not burned by the hot air that has passed through the high-temperature red hot part of the sintering progress zone, but the coke is burned by the sucked cold air. Therefore, the combustion temperature does not rise, and the sinter becomes low in strength because it is not sufficiently sintered. Middle class,
The strength of the lower layer is also insufficient because it is affected by insufficient sintering of the sintered surface layer, and there is a tendency that the strength of the sintered ore is low in all layers. Therefore, when crushing and sizing, there are many fine particles,
There is a problem that yield decreases.

【０００７】このような問題の解決方法として、点火す
る前の充填層に熱風を吸引し、表層の原料温度を高くし
て着火性を改善し、熱不足を解消する方法が知られてい
る。また、点火するまでの表層に燃料のコークスを多く
供給し、表層の熱不足を解消する方法が特開昭６０−１
４００８７号公報に開示されている。更に、特開昭６１
−９５２６号公報には、点火炉を出た後の表層焼結鉱の
上面から加圧する方法が開示されている。しかし、これ
らの方法では表層の歩留が十分に改善されているとは言
えないのが現状である。As a method for solving such a problem, there is known a method in which hot air is sucked into the packed bed before ignition, the raw material temperature of the surface layer is raised to improve the ignitability, and the lack of heat is eliminated. Further, there is a method of supplying a large amount of fuel coke to the surface layer until ignition so as to eliminate the heat shortage of the surface layer.
It is disclosed in Japanese Patent No. 40087. Furthermore, JP-A-61
Japanese Patent Publication No. 9526 discloses a method of pressing from the upper surface of the surface layer sintered ore after leaving the ignition furnace. However, it cannot be said that the surface layer yield is sufficiently improved by these methods.

【０００８】本発明は上記問題を解決し、焼結鉱製造に
おける焼結層表層の歩留を向上させ得る焼結鉱の製造方
法を提供することを目的とする。An object of the present invention is to solve the above problems and to provide a method for producing a sintered ore capable of improving the yield of the surface layer of the sintered layer in the production of a sintered ore.

【０００９】[0009]

【課題を解決するための手段】本発明の要旨は、下方吸
引式焼結機に焼結原料を装入する際に、ＣａＯ／ＳｉＯ
2 が２．３以上３．６以下である高ＣａＯ／ＳｉＯ2 原
料を焼結充填層表層に装入し、この充填層表層に点火し
て焼結することを特徴とする焼結鉱の製造方法である。
この表層の高ＣａＯ／ＳｉＯ2 原料には炭材を添加し
て、点火を容易にすることができる。The gist of the present invention is to use CaO / SiO when charging a sintering raw material into a lower suction type sintering machine.
Production of sinter ore characterized in that a high CaO / SiO 2 raw material in which 2 is 2.3 or more and 3.6 or less is charged into the surface layer of the sintered packed bed, and the surface layer of the packed bed is ignited and sintered. Is the way.
Carbonaceous material can be added to the high CaO / SiO 2 raw material of the surface layer to facilitate ignition.

【００１０】[0010]

【作用】本発明者らは焼結層表層の歩留が低いことから
焼結層表層の歩留向上技術を研究していたが、焼結層表
層の原料をＣａＯ／ＳｉＯ2 が２．３以上３．６以下の
高ＣａＯ／ＳｉＯ2 にすると焼結表層の強度が大きくな
って歩留が向上し、且つ中層、下層にも好影響を及ぼ
し、焼結層全体の歩留が向上すること、また高ＣａＯ／
ＳｉＯ2 原料に炭材を添加して表層に装入すると更に強
度が大きくなり、歩留が向上することを知見した。The present inventors have been studying a technique for improving the yield of the surface of the sintered layer because the yield of the surface of the sintered layer is low. However, CaO / SiO 2 is used as the raw material for the surface of the sintered layer 2.3. When the CaO / SiO 2 is higher than 3.6, the strength of the sintered surface layer is increased and the yield is improved, and the intermediate layer and the lower layer are also positively affected, and the yield of the entire sintered layer is improved. , High CaO /
It was found that when a carbonaceous material is added to the SiO 2 raw material and charged into the surface layer, the strength is further increased and the yield is improved.

【００１１】図３に歩留と焼結層表層のＣａＯ／ＳｉＯ
2 との関係を示す。ＣａＯ／ＳｉＯ2 が２．３以上で歩
留の向上は顕著である。しかしＣａＯ／ＳｉＯ2 が３．
６以上になると逆に低下傾向を示す。このように歩留は
ＣａＯ／ＳｉＯ2 が２．３以上３．６以下の範囲におい
て８０％以上の高い値を示す。FIG. 3 shows the yield and CaO / SiO on the surface of the sintered layer.
The relationship with 2 is shown. When CaO / SiO 2 is 2.3 or more, the yield improvement is remarkable. However, CaO / SiO 2 is 3.
On the other hand, when it is 6 or more, it tends to decrease. Thus, the yield shows a high value of 80% or more in the range where CaO / SiO 2 is 2.3 or more and 3.6 or less.

【００１２】この高い歩留を示す高ＣａＯ／ＳｉＯ2 原
料で焼結層全層を構成し、焼結すると歩留は大幅に向上
する。歩留の向上により焼結鉱製造単価は大幅に低下
し、そのメリットは大きなものとなる。しかし、高Ｃａ
Ｏ／ＳｉＯ2 の焼結鉱は高炉で製銑するとき主としてＣ
ａＯ、ＳｉＯで構成される溶鉄単位重量当たりのスラグ
の量が多くなり、高炉の燃料費が高くなるので製銑工程
のトータルコストが大きくなる。このため焼結層全層を
高ＣａＯ／ＳｉＯ2 にし難いのが現状である。The yield is greatly improved by forming and sintering all layers of the sintered layer from the high CaO / SiO 2 raw material showing the high yield. The improvement of the yield will greatly reduce the unit price of sinter ore production, and the merit will be great. However, high Ca
O / SiO 2 sinter is mainly C when making iron in a blast furnace.
Since the amount of slag per unit weight of molten iron composed of aO and SiO increases and the fuel cost of the blast furnace increases, the total cost of the ironmaking process increases. Therefore, under the present circumstances, it is difficult to make all the sintered layers high CaO / SiO 2 .

【００１３】そこで、本発明では焼結充填層表層のみを
高ＣａＯ／ＳｉＯ2 とし、表層の歩留を高くすることに
より全層の歩留を改善する。焼結充填層表層のみの高Ｃ
ａＯ、ＳｉＯ2 分のスラグの量が多くなるだけなので増
量スラグの量は大きなものではなく、高炉の燃料費を押
さえることが出来る。したがって表層は薄いほうが望ま
しいが、あまり薄いと歩留の向上効果が小さくなるので
１０〜１００ｍｍの範囲が好ましい。Therefore, in the present invention, only the surface layer of the sintered filling layer is made to have high CaO / SiO 2 and the yield of the surface layer is increased to improve the yield of all layers. High C only for the surface layer of the sintered packing layer
Since the amount of slag for aO and SiO 2 only increases, the amount of increased slag is not large and the fuel cost of the blast furnace can be suppressed. Therefore, it is preferable that the surface layer is thin, but if it is too thin, the effect of improving the yield becomes small, so the range of 10 to 100 mm is preferable.

【００１４】[0014]

【実施例】以下、本発明の好ましい実施例を説明する。The preferred embodiments of the present invention will be described below.

【００１５】[0015]

【実施例１】図１に実施例１を示す。First Embodiment FIG. 1 shows a first embodiment.

【００１６】従来と同じように原料ホッパーから切り出
した原料にミキサー１０で水分を６．８％添加し、調湿
造粒した。調湿造粒後の焼結原料１はサージホッパー２
に一旦装入し、ドラムフィーダー３から切り出しシュー
ト４を介してパレット１２に装入して充填層５を５５０
ｍｍ形成した。In the same manner as in the conventional case, 6.8% of water was added to the raw material cut out from the raw material hopper by the mixer 10 and subjected to humidity conditioning granulation. Sinter hopper 2 is used as sintering raw material 1 after moisture conditioning granulation.
Once into the pallet 12 through the chute 4 cut out from the drum feeder 3 and the packed bed 5 550.
mm formed.

【００１７】表層に装入する原料はミキサー１０の後で
ベルトコンベアー１３で表層５０ｍｍに相当する量だけ
取りだし、高ＣａＯ／ＳｉＯ2 原料用石灰石ホッパー２
１ａから焼結原料のＣａＯ／ＳｉＯ2 が２．８になるよ
うに高ＣａＯ／ＳｉＯ2 原料用石灰石２２ａを添加し
た。高ＣａＯ／ＳｉＯ2 原料用石灰石２２ａを添加した
高ＣａＯ／ＳｉＯ2 原料２５は高ＣａＯ／ＳｉＯ2 原料
用サージホッパー２４に一旦貯蔵し、高ＣａＯ／ＳｉＯ
2 原料用ドラムフィーダー２６から切り出し、高ＣａＯ
／ＳｉＯ2 原料用シュート２７を介して充填層５の表層
に装入し、充填層表層２８を５０ｍｍ形成した。The raw material charged into the surface layer is taken out by the belt conveyor 13 after the mixer 10 in an amount corresponding to the surface layer of 50 mm, and the limestone hopper 2 for high CaO / SiO 2 raw material is used.
CaO / SiO 2 of sintering material from 1a is added a high CaO / SiO 2 raw material limestone 22a to be 2.8. The high CaO / SiO 2 raw material 25 added with the high CaO / SiO 2 raw material limestone 22a is temporarily stored in the high CaO / SiO 2 raw material surge hopper 24, and
2 High-CaO cut out from the drum feeder 26 for raw materials
It was charged into the surface layer of the filling layer 5 via the / SiO 2 raw material chute 27 to form a filling layer surface layer 50 of 50 mm.

【００１８】この充填層表層２８のコークスに点火炉１
１で点火し、下方に空気を吸引しながらコークスを燃焼
させ、この燃焼熱で上層から下層にかけて順次焼結し
た。The coke on the surface layer 28 of the packed bed is ignited by the ignition furnace 1
Ignition was performed at 1, and coke was burned while sucking air downward, and the combustion heat was used to sequentially sinter from the upper layer to the lower layer.

【００１９】表層を高ＣａＯ／ＳｉＯ2 にすることによ
って表層の歩留が改善し、且つ全層の歩留が向上した。
すなわち、実施例１の歩留は従来の歩留７６．３％より
６．２％高い８２．５％に向上した。By making the surface layer high in CaO / SiO 2 , the yield of the surface layer was improved and the yield of all layers was improved.
That is, the yield of Example 1 was improved to 6.2% by 8% from the conventional yield of 76.3%.

【００２０】[0020]

【実施例２】図２に実施例２を示す。Second Embodiment FIG. 2 shows a second embodiment.

【００２１】従来と同じように原料ホッパーから切り出
した原料にミキサー１０で水分を６．８％添加し、調湿
造粒した。調湿造粒後の焼結原料１はサージホッパー２
に一旦装入し、ドラムフィーダー３から切り出しシュー
ト４を介してパレット１２に装入して充填層５を５００
ｍｍ形成した。In the same manner as in the conventional method, 6.8% of water was added to the raw material cut out from the raw material hopper by the mixer 10, and the moisture-regulated granulation was performed. Sinter hopper 2 is used as sintering raw material 1 after moisture conditioning granulation.
Once into the pallet 12 from the drum feeder 3 through the cutting chute 4 and the packed bed 5 to 500
mm formed.

【００２２】表層に装入する原料はミキサー１０の後で
ベルトコンベアー１３で表層１００ｍｍに相当する量だ
け取りだし、高ＣａＯ／ＳｉＯ2 原料用石灰石ホッパー
２１ａから焼結原料のＣａＯ／ＳｉＯ2 が３．０になる
ように高ＣａＯ／ＳｉＯ2 原料用石灰石２２ａを添加し
た。更に高ＣａＯ／ＳｉＯ2 原料用炭材ホッパー２１ｂ
から高ＣａＯ／ＳｉＯ2 原料用ＣＤＱ粉（コークス工場
乾式集塵コークス粉）２２ｂを表層に装入する原料に対
して３％添加した。高ＣａＯ／ＳｉＯ2 原料用石灰石２
２ａと高ＣａＯ／ＳｉＯ2 原料用ＣＤＱ粉２２ｂを添加
した高ＣａＯ／ＳｉＯ2 原料２５は高ＣａＯ／ＳｉＯ2
原料用サージホッパー２４に一旦貯蔵し、高ＣａＯ／Ｓ
ｉＯ2 原料用ドラムフィーダー２６から切り出し、高Ｃ
ａＯ／ＳｉＯ2 原料用シュート２７を介して充填層５の
表層に装入し、充填層表層２８を１００ｍｍ形成した。The belt conveyor 13 is taken out by an amount corresponding to the surface layer 100 mm, the high CaO / SiO 2 raw material limestone hopper 21a of the sintering raw CaO / SiO 2 after raw material mixer 10 is charged to the surface layer 3. Limestone 22a for high CaO / SiO 2 raw material was added so as to be 0. Higher CaO / SiO 2 raw material carbon material hopper 21b
3% of CDQ powder for high CaO / SiO 2 raw material (dry coke dust coke factory coke powder) 22b was added to the raw material charged in the surface layer. High CaO / SiO 2 raw material limestone 2
2a and the high CaO / SiO 2 raw material 25 to which the CDQ powder 22b for the high CaO / SiO 2 raw material is added is high CaO / SiO 2
Once stored in the raw material surge hopper 24, high CaO / S
Cut out from the drum feeder 26 for iO 2 raw material, and high C
It was charged into the surface layer of the filling layer 5 through the chute 27 for aO / SiO 2 raw material to form a filling layer surface layer 28 of 100 mm.

【００２３】この充填層表層２８のコークスに点火炉１
１で点火し、下方に空気を吸引しながらコークスを燃焼
させ、この燃焼熱で上層から下層にかけて順次焼結し
た。The coke on the surface layer 28 of the packed bed is ignited by the ignition furnace 1
Ignition was performed at 1, and coke was burned while sucking air downward, and the combustion heat was used to sequentially sinter from the upper layer to the lower layer.

【００２４】表層の原料を高ＣａＯ／ＳｉＯ2 にし、更
に炭材を添加することにより表層の歩留が改善し、且つ
全層の歩留が向上した。すなわち、実施例２の歩留は従
来の歩留７６．３％より８．１％高い８４．４％に向上
した。By making the raw material of the surface layer high CaO / SiO 2 and further adding a carbonaceous material, the yield of the surface layer was improved and the yield of all layers was improved. That is, the yield of Example 2 was improved to 84.4%, which was 8.1% higher than the conventional yield of 76.3%.

【００２５】[0025]

【発明の効果】本発明によれば充填層表層の歩留が改善
される。According to the present invention, the yield of the filling layer surface layer is improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.

【図２】本発明の実施例を示す図である。FIG. 2 is a diagram showing an example of the present invention.

【図３】歩留と焼結層表層のＣａＯ／ＳｉＯ2 との関係
を示す図である。FIG. 3 is a diagram showing the relationship between yield and CaO / SiO 2 on the surface of the sintered layer.

【図４】従来方法の概略工程を示す図である。FIG. 4 is a diagram showing a schematic process of a conventional method.

【符号の説明】[Explanation of symbols]

１ 焼結原料 ２ サージホッパー ３ ドラムフィーダー ４ シュート ５ 充填層 ６ コークスホッパー ７ 返鉱ホッパー ８ 石灰石ホッパー ９ 鉱石ホッパー １０ ミキサー １１ 点火炉 １２ パレット １３ ベルトコンベアー ２１ａ 高ＣａＯ／ＳｉＯ2 原料用石灰石ホッパー ２１ｂ 高ＣａＯ／ＳｉＯ2 原料用炭材ホッパー ２２ａ 高ＣａＯ／ＳｉＯ2 原料用石灰石 ２２ｂ 高ＣａＯ／ＳｉＯ2 原料用ＣＤＱ粉 ２３ 高ＣａＯ／ＳｉＯ2 原料用ミキサー ２４ 高ＣａＯ／ＳｉＯ2 原料用サージホッパー ２５ 高ＣａＯ／ＳｉＯ2 原料 ２６ 高ＣａＯ／ＳｉＯ2 原料用ドラムフィーダー ２７ 高ＣａＯ／ＳｉＯ2 原料用シュート ２８ 充填層表層1 Sintering Raw Material 2 Surge Hopper 3 Drum Feeder 4 Chute 5 Packed Bed 6 Coke Hopper 7 Return Ore Hopper 8 Limestone Hopper 9 Ore Hopper 10 Mixer 11 Ignition Furnace 12 Pallet 13 Belt Conveyor 21a High CaO / SiO 2 Raw Material Limestone Hopper 21b High CaO / SiO 2 raw material carbon hopper 22a High CaO / SiO 2 raw material limestone 22b High CaO / SiO 2 raw material CDQ powder 23 High CaO / SiO 2 raw material mixer 24 High CaO / SiO 2 raw material surge hopper 25 High CaO / SiO 2 raw material 26 High CaO / SiO 2 raw material drum feeder 27 High CaO / SiO 2 raw material chute 28 Filled layer surface layer

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 下方吸引式焼結機に焼結原料を装入する
際に、ＣａＯ／ＳｉＯ2 が２．３以上３．６以下である
高ＣａＯ／ＳｉＯ2 原料を焼結充填層表層に装入し、こ
の充填層表層に点火して焼結することを特徴とする焼結
鉱の製造方法。When charged sintering raw material 1. A downward suction type sintering machine, CaO / SiO 2 is a high CaO / SiO 2 raw material is 2.3 or more 3.6 or less in the sintered filling layer surface A method for producing a sinter, which comprises charging and igniting the surface layer of the packed bed to sinter. 【請求項２】 高ＣａＯ／ＳｉＯ2 原料に炭材を添加
し、これを焼結充填層表層に装入することを特徴とする
請求項１記載の焼結鉱の製造方法。2. The method for producing a sintered ore according to claim 1, wherein a carbonaceous material is added to the high CaO / SiO 2 raw material, and the raw material is charged into the surface layer of the sintered packed bed.
JP1782893A 1993-01-11 1993-01-11 Production of sintered ore Pending JPH06212294A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1782893A JPH06212294A (en) 1993-01-11 1993-01-11 Production of sintered ore

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1782893A JPH06212294A (en) 1993-01-11 1993-01-11 Production of sintered ore

Publications (1)

Publication Number Publication Date
JPH06212294A true JPH06212294A (en) 1994-08-02

Family

ID=11954578

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1782893A Pending JPH06212294A (en) 1993-01-11 1993-01-11 Production of sintered ore

Country Status (1)

Country Link
JP (1) JPH06212294A (en)

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