JPH08295951A - Pretreatment of material to be sintered - Google Patents
Pretreatment of material to be sinteredInfo
- Publication number
- JPH08295951A JPH08295951A JP12039895A JP12039895A JPH08295951A JP H08295951 A JPH08295951 A JP H08295951A JP 12039895 A JP12039895 A JP 12039895A JP 12039895 A JP12039895 A JP 12039895A JP H08295951 A JPH08295951 A JP H08295951A
- Authority
- JP
- Japan
- Prior art keywords
- limestone
- raw material
- coke
- sintering raw
- water
- 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.)
- Withdrawn
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ドワイトロイド式焼結
機により焼結鉱を製造する方法の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for producing a sintered ore by a Dwightroid type sintering machine.
【０００２】[0002]
【従来の技術】鉄鉱石の焼結に際しては、通常ドワイト
ロイド式焼結機が広く用いられている。この形式の焼結
機では点火炉内で配合原料の表面層に点火し、下向きに
吸気することにより原料層内の燃焼帯が漸次上層部から
中層部、下層部に移行してゆき、全焼結過程は２５〜３
０分程度で完了する。2. Description of the Related Art Generally, a Dwightroid type sintering machine is widely used for the sintering of iron ore. In this type of sintering machine, the surface layer of the blended raw material is ignited in the ignition furnace and the combustion zone in the raw material layer gradually shifts from the upper layer portion to the middle layer portion and the lower layer portion by inhaling downward, and the total sintering is completed. The process is 25-3
It will be completed in about 0 minutes.
【０００３】焼結鉱製造に際して重要なことは、生産率
を最大にし、冷間強度や耐還元粉化性で代表される焼結
鉱の品質を高位に安定させ、燃料原単位と点火燃料原単
位は最小とする方法を取ることである。したがって、実
操業では生石灰に代表されるバインダーを添加して焼結
原料の擬似粒化性を向上させて焼結ベッドの通気性を改
善して生産性を向上させ、焼結鉱の品質を高位に安定さ
せて、燃料として添加するコークスや無煙炭等の量、点
火時の燃料であるコークス炉ガスや微粉炭等の量は少な
くして操業している。What is important in the production of sinter is to maximize the production rate, to stabilize the quality of sinter represented by cold strength and resistance to reduction pulverization to a high level, and to improve the fuel consumption rate and ignition fuel consumption. The unit is to take the method of minimizing. Therefore, in actual operation, a binder represented by quick lime is added to improve the pseudo-granulation property of the sintering raw material, improve the air permeability of the sintering bed, improve the productivity, and improve the quality of the sintered ore. The amount of coke and anthracite added as fuel and the amount of coke oven gas and pulverized coal that are fuels at the time of ignition are reduced and the operation is performed.
【０００４】ところが、生石灰に代表されるバインダー
を添加して生産性を向上させると、バインダーコストが
大幅に上昇してコストデメリットが多大になる欠点があ
る。また焼結原料への燃料の配合割合や点火燃料の量を
いたずらに下げても良い結果は得られるものではなく、
それらを大幅に低下させると焼結鉱品質を悪化させた
り、返鉱が多くなってむしろ燃料原単位や点火燃料原単
位の悪化を引き起こすことになる。However, when a binder represented by quicklime is added to improve the productivity, there is a drawback that the binder cost increases significantly and the cost disadvantage becomes great. Also, it is not possible to obtain a good result by unnecessarily reducing the blending ratio of fuel to the sintering raw material or the amount of ignition fuel.
If they are reduced to a large extent, the quality of the sinter ore will be deteriorated, and the amount of returned ore will be increased, which will rather deteriorate the fuel consumption rate or ignition fuel consumption rate.
【０００５】上記したような焼結鉱製造方法の問題点を
解決する方法として、例えば特公昭６３−６２５５８号
公報には、０．５ｍｍ以下の粒子径のコークス粉にセメ
ント等のバインダーを添加し、転動造粒して擬似粒化あ
るいは造粒化して焼結用燃料にする方法が記載されてい
る。この造粒物は擬似粒子の核になって焼結原料全体の
擬似粒化性を改善できるが、強固な造粒物にするために
高価なバインダーが使用されており、造粒コストが高い
という問題がある。As a method for solving the above-mentioned problems of the method for producing a sintered ore, for example, in Japanese Patent Publication No. 63-62558, a binder such as cement is added to coke powder having a particle diameter of 0.5 mm or less. , A method of rolling granulation for pseudo-granulation or granulation for use as a fuel for sintering is described. Although this granule can improve the pseudo-granulation property of the entire sintering raw material by becoming the core of the pseudo-particle, an expensive binder is used to make it a strong granule, and the granulation cost is high. There's a problem.
【０００６】また、特公昭６３−１３４７５号公報に
は、粒径７ｍｍ未満１００重量％の粉コークスにセメン
トと水を加えて混合してこの混合物を積付けし、セメン
トの水和反応により形成された水和物でコークス粒子間
が結合されるまで養生し、この積付け養生物を粒径０．
５ｍｍ未満が４０重量％以下となるように解砕して鉄鉱
石焼結用粉コークスとして使用する方法が記載されてい
る。この粉コークスも擬似粒子の核になって焼結原料全
体の擬似粒化性を改善できるが、バインダーとして使用
するセメントのコストが高い欠点がある。In Japanese Patent Publication No. 63-13475, cement and water are added to and mixed with powder coke having a particle size of less than 7 mm and 100% by weight, and the mixture is stacked to form a cement hydration reaction. The coke particles are cured with different hydrates until the coke particles are bonded to each other.
It describes a method of crushing less than 5 mm to 40% by weight or less and using it as a coke for iron ore sintering. This powder coke also serves as the core of the pseudo particles and can improve the pseudo granulation property of the entire sintering raw material, but there is a drawback that the cost of the cement used as the binder is high.
【０００７】さらに、特開昭５８−９１１３２号公報に
は、粉状鉱石を下方吸気式焼結機で焼結する際、石灰石
を水分２〜７％で造粒し、造粒後の粒度が０．５ｍｍ以
下が２０％以下、３ｍｍ以上が４０％以下の石灰石を他
の原料と配合して焼結し、還元粉化性に悪い２次ヘマタ
イトの生成を抑えながら被還元性の良いカルシウムフェ
ライトを多量に生成してＪＩＳ還元率と還元粉化指数
（ＲＤＩ）の向上を図る方法が開示されている。この石
灰石の造粒物も擬似粒子の核になって焼結原料全体の擬
似粒化性を改善すると考えられるが、石灰石を事前に造
粒する造粒機等の設備費が多大になる問題がある。Further, in Japanese Patent Application Laid-Open No. 58-91132, when powdered ore is sintered by a lower intake type sintering machine, limestone is granulated with a water content of 2 to 7%, and the particle size after granulation is Calcium ferrite with good reducibility while suppressing the formation of secondary hematite, which is poor in reduction powdering property, by mixing limestone with 0.5% or less 20% or less and 3 mm or more 40% or less with other raw materials and sintering. There is disclosed a method of producing a large amount of methane to improve the JIS reduction rate and the reduction dusting index (RDI). It is considered that this granulated product of limestone also serves as a nucleus of pseudo particles to improve the pseudo granulation property of the entire sintering raw material, but there is a problem that the equipment cost of a granulator for granulating limestone in advance becomes large. is there.
【０００８】[0008]
【発明が解決しようとする課題】上記従来の方法により
粉コークスや石灰石の粒度を大きくして焼結原料の擬似
粒子の核にするには、バインダーコストが多大になり、
設備費の高い造粒設備や輸送コンベヤー設備の新設が必
要になる欠点があった。本発明法は、バインダー不使用
で造粒設備ならびに輸送コンベヤーの新設を必要としな
い焼結原料の事前処理方法を提供することを目的とす
る。In order to increase the particle size of powdered coke or limestone to form the core of pseudo particles of the sintering raw material by the above-mentioned conventional method, the binder cost becomes large,
There was a drawback that it was necessary to install new granulation equipment and transportation conveyor equipment, which had high equipment costs. An object of the present invention is to provide a pretreatment method for a sintering raw material which does not use a binder and does not require new granulation equipment and a transportation conveyor.
【０００９】[0009]
【課題を解決するための手段】本発明の第１の焼結原料
の事前処理方法は、焼結原料の粉コークスおよび／また
は石灰石にマイクロ波を照射して加熱し、前記粉コーク
スおよび／または石灰石の内部の水分を表面に滲ませた
後、鉄鉱石を主体とするその他の焼結原料と混合して造
粒することを特徴とする焼結原料の事前処理方法であ
る。その際、焼結原料の粉コークスおよび／または石灰
石の搬送ライン上に設置したマイクロ波発生装置から前
記粉コークスおよび／または石灰石の上にマイクロ波を
照射することが好ましい。また、本発明の第２の焼結原
料の事前処理方法は、焼結原料の粉コークスおよび／ま
たは石灰石に水を添加して、前記粉コークスおよび／ま
たは石灰石の含水量を１０〜３０ｍａｓｓ％にした後、
鉄鉱石を主体とするその他の焼結原料と混合して造粒す
ることを特徴とする焼結原料の事前処理方法である。そ
の際、焼結原料の粉コークスおよび／または石灰石の搬
送ライン上に設置した水添加装置から前記粉コークスお
よび／または石灰石の上に水をスプレー状に添加するこ
と、または、焼結原料の粉コークスおよび／または石灰
石の輸送用コンベヤーのヘッドの落ち口に設置した水添
加装置から、落下する前記粉コークスおよび／または石
灰石に水をスプレー状に添加することが好ましい。な
お、配合原料と返鉱、粉コークスの全体を焼結原料と定
義する。A first method of pretreating a sintering raw material according to the present invention is to irradiate microwaves to a powdery coke and / or limestone of the sintering raw material to heat the powdery coke and / or the coke. This is a pretreatment method for a sintering raw material, which comprises bleaching the water inside the limestone on the surface and then mixing with another sintering raw material mainly composed of iron ore and granulating. At that time, it is preferable to irradiate the powder coke and / or limestone with microwaves from a microwave generator installed on a conveying line of powder coke and / or limestone as a sintering raw material. Further, the second pretreatment method for a sintering raw material of the present invention comprises adding water to the powder coke and / or limestone of the sintering raw material so that the water content of the powder coke and / or limestone is 10 to 30 mass%. After doing
This is a pretreatment method for a sintering raw material, which is characterized in that it is mixed with another sintering raw material mainly composed of iron ore and granulated. At that time, water is spray-added onto the powder coke and / or limestone from a water addition device installed on the conveying line of the powder coke and / or limestone of the sintering raw material, or the powder of the sintering raw material is added. It is preferable to add water in a spray form to the falling powdery coke and / or limestone from a water addition device installed at the outlet of the head of a conveyor for transporting coke and / or limestone. The whole of the blended raw material, the return ore and the coke powder is defined as the sintering raw material.
【００１０】[0010]
【作用】焼結原料の主体は鉄鉱石であり、それに粉コー
クスや副原料の石灰石等が配合されている。嵩比重の値
は、鉄鉱石の２．５程度に対して粉コークスは０．５程
度、石灰石は１．５程度である。鉄鉱石より嵩比重が小
さい粉コークスならびに石灰石が焼結原料擬似粒子の付
着粉中に巻き込まれると、付着粉の中に異質なものが混
じるので付着力が低下し、焼結原料の擬似粒化性が阻害
される。ところが、粉コークスや石灰石が擬似粒子の核
になると、その周りに嵩比重がほぼ一定の鉄鉱石類が主
体に付着するので付着力が強固になり、焼結原料の擬似
粒化性が大幅に改善される。したがって、粉コークス、
石灰石を事前に造粒してから鉄鉱石と混合、造粒する方
法は、焼結原料の擬似粒化性の改善に有効な方法であ
る。しかし、以上の方法では粉コークス、石灰石を事前
に造粒する設備が必要になるので、造粒機とそれに付随
する輸送コンベヤーなどの設備費が多大になる欠点があ
る。[Function] The main raw material of the sintering raw material is iron ore, and powdered coke and limestone as an auxiliary raw material are mixed therein. The bulk specific gravity is about 0.5 for iron ore, about 0.5 for powder coke, and about 1.5 for limestone. When powder coke and limestone, which have a lower bulk specific gravity than iron ore, are caught in the adhered powder of the sintering raw material pseudo-particles, foreign substances are mixed in the adhered powder and the adhesive force decreases, resulting in pseudo-granulation of the sintering raw material. Sex is disturbed. However, when powdered coke or limestone becomes the core of the pseudo particles, iron ores with a substantially constant bulk specific gravity adhere to the main body around them, so that the adhesion becomes strong and the pseudo-granulation property of the sintering raw material is greatly increased. Be improved. Therefore, powder coke,
A method in which limestone is granulated in advance and then mixed with iron ore and granulated is an effective method for improving the pseudo-granulation property of the sintering raw material. However, the above method requires a facility for granulating coke powder and limestone in advance, so that there is a disadvantage in that the facility cost of the granulator and its associated transport conveyor becomes large.
【００１１】本発明は、粉コークスや石灰石の搬送ライ
ン上にマイクロ波発生装置またはスプレー状に水をかけ
る水添加装置を設置し、粉コークスや石灰石をその他の
鉄鉱石等の原料と混合、造粒する前に粉コークスや石灰
石の表面水分または全体の含有水分を増加させる方法で
ある。造粒機を設置しないので、設備費は大幅に安くで
きる。本発明法により、粉コークスや石灰石は焼結原料
擬似粒子の核になりやすくなり、そのため焼結原料全体
の擬似粒化性が向上するので、生産率向上と成品歩留向
上、焼結鉱品質の高位安定、燃料原単位の低減、ＮＯｘ
発生量低減等の効果を同時にもたらすことができる。According to the present invention, a microwave generator or a water addition device for spraying water is installed on a powder coke or limestone transport line, and the powder coke or limestone is mixed with other raw materials such as iron ore and produced. It is a method of increasing the surface water content of coke powder or limestone or the total water content before granulation. Since no granulator is installed, the equipment cost can be significantly reduced. According to the method of the present invention, powder coke and limestone are likely to become nuclei for the sintering raw material pseudo-particles, and therefore the pseudo-granulation property of the entire sintering raw material is improved, so that the production rate is improved, the product yield is improved, and the sinter quality is improved. Stable, low fuel consumption rate, NOx
The effect of reducing the generation amount can be obtained at the same time.
【００１２】本発明は、マイクロ波の照射により粉コー
クスや石灰石の内部の水分を短時間に加熱して急速に表
面へ染み出させ、水が表面に滲んだ状態の粉コークスや
石灰石とその他の鉄鉱石類を混合、造粒するので、粉コ
ークスや石灰石が核となり、粉コークスや石灰石の周り
に鉄鉱石類が付着して焼結原料全体の擬似粒化性を大幅
に改善できる。また、粉コークスや石灰石に水を添加し
て含有水分を増加させるとそれらの表面の水分が増加す
るので、それらの周りに鉄鉱石類が付着し易くなり、焼
結原料全体の擬似粒化性が改善される。そのため、バイ
ンダーを大幅に低減またはゼロにして焼結原料を造粒し
ても、バインダーを添加して造粒した場合の擬似粒化物
と変わらないものができる。その結果、点火後の焼結速
度が増加し、またパレット幅方向の焼結速度のバラツキ
が小さくなるので、生産率向上と成品歩留向上、焼結鉱
品質の高位安定、燃料原単位の低減、ＮＯｘ発生量低減
等の効果を同時にもたらすことができる。「鉄と鋼」、
Ｖｏｌ．８１（１９９５）、Ｎｏ．１，ｐ．３４には、
造粒機でバインダーを添加して造粒した造粒コークスが
擬似粒子の核になって焼結原料の擬似粒化性を向上さ
せ、焼結鉱の被還元性を向上させ、ＮＯｘ排出量を抑制
することが記載されており、本発明法と同じ効果が報告
されている。According to the present invention, the moisture in the powdered coke or limestone is heated in a short time by the irradiation of microwaves so that the water is rapidly exuded to the surface, and the powdered coke or limestone in a state where water is spread on the surface and other Since the iron ore is mixed and granulated, the powder coke and limestone serve as nuclei, and the iron ore adheres to the periphery of the powder coke and limestone, and the pseudo-granulation property of the entire sintering raw material can be significantly improved. Also, when water is added to powdered coke or limestone to increase the water content, the water content on those surfaces increases, so iron ores easily attach to them and the pseudo-granulation property of the entire sintering raw material is increased. Is improved. Therefore, even if the binder is drastically reduced or reduced to zero and the sintering raw material is granulated, a pseudo-granulated product in the case where the binder is added and granulated can be obtained. As a result, the sintering rate after ignition increases and the variation in the sintering rate in the pallet width direction is reduced, so the production rate and product yield are improved, the sinter quality is stable at a high level, and the fuel consumption rate is reduced. , NOx generation amount reduction effect and the like can be brought at the same time. "Iron and steel",
Vol. 81 (1995), no. 1, p. 34 includes
The granulated coke granulated by adding a binder with a granulator serves as the nucleus of the pseudo particles to improve the pseudo granulation property of the sintering raw material, improve the reducibility of the sintered ore, and reduce the NOx emission amount. Suppression is described, and the same effect as the method of the present invention is reported.
【００１３】粉コークスや石灰石の表面に水分を滲ませ
るマイクロ波としては、ＩＳＮバンドとして２４５０Ｍ
Ｈｚと９１５ＭＨｚとが許可されているので、いずれか
を選択使用できる。また所要のエネルギー量を確保する
ためには、例えば印加電圧５ｋＷや２５ｋＷのマイクロ
波発生装置を複数台設置し、各発生装置からのマイクロ
波を導波管で集めて照射すればよい。粉コークスや石灰
石の内部水分はマイクロ波を吸収して発熱し、表面に出
てくる。しかし、マイクロ波を照射し過ぎると水分が蒸
発し、粉コークスや石灰石が乾燥してしまうので、短時
間の照射に止めるのが良い。したがって、粉コークスや
石灰石の重量に対して照射するマイクロ波の出力、照射
時間を調節して、粉コークスや石灰石の表面に内部の水
が滲む条件を決める必要がある。[0013] As a microwave for bleeding water on the surface of powder coke or limestone, 2450 M as an ISN band
Since Hz and 915 MHz are permitted, either one can be selected and used. Further, in order to secure the required amount of energy, for example, a plurality of microwave generators having an applied voltage of 5 kW or 25 kW may be installed, and the microwaves from each generator may be collected by a waveguide and irradiated. The internal water content of powder coke and limestone absorbs microwaves to generate heat, which then appears on the surface. However, if microwaves are radiated too much, water will evaporate, and powder coke and limestone will be dried, so it is better to stop the irradiation for a short time. Therefore, it is necessary to adjust the output of microwaves and the irradiation time with respect to the weight of the powder coke or limestone to determine the conditions under which the water inside the surface of the powder coke or limestone bleeds.
【００１４】粉コークスおよび／または石灰石に水を添
加する方法では、水を上からスプレー状にかけるのが最
も均一に水を添加することができる。粉コークスおよび
／または石灰石の輸送用コンベヤーのコンベヤーヘッド
の落ち口に水添加装置を設置し、水をスプレー状に添加
するのが最も効果的である。粉コークスや石灰石の含有
水分の範囲を１０〜３０ｍａｓｓ％としたのは、１０ｍ
ａｓｓ％未満では効果が発現せず、３０ｍａｓｓ％超に
なると焼結原料の擬似粒子の核にならずに単独で擬似粒
化するからである。In the method of adding water to powder coke and / or limestone, spraying water from the top can add water most uniformly. It is most effective to install the water addition device at the outlet of the conveyor head of the conveyor for transporting powdered coke and / or limestone and add the water in a spray form. The range of water content of powder coke and limestone is 10 to 30 mass% is 10 m
This is because if it is less than ass%, the effect is not exhibited, and if it exceeds 30 mass%, it does not become nuclei of the pseudo particles of the sintering raw material and is independently made into pseudo particles.
【００１５】[0015]
【実施例】以下、図面に基づいて本発明の実施例を詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００１６】図１は本発明を実施する設備の概要を示す
図である。FIG. 1 is a diagram showing an outline of equipment for carrying out the present invention.
【００１７】焼結原料１はサージホッパー２からドラム
フィーダー３、原料装入装置５を介してパレット６上に
連続的に供給され、パレット６内に層状に積層される。
この間、原料給鉱側のスプロケット４を回転させてパレ
ット６を所定の速度で移動させると共に、パレット６の
下側に複数個設けたウインドボックス８、メインダクト
９、排ガス集塵機１０を経て吸引ブロワー１１により吸
気する。点火炉１２で積層原料７の上面に点火して、パ
レット６上の積層原料７が排鉱部に達する間に全層にわ
たって焼結反応を完了させるように速度制御して連続運
転する。The sintering raw material 1 is continuously supplied from the surge hopper 2 to the pallet 6 via the drum feeder 3 and the raw material charging device 5, and is laminated in the pallet 6 in layers.
During this period, the sprocket 4 on the raw material ore supply side is rotated to move the pallet 6 at a predetermined speed, and the suction blower 11 is passed through the wind box 8, the main duct 9, and the exhaust gas dust collector 10 provided below the pallet 6. Inhale by. The upper surface of the laminated raw material 7 is ignited by the ignition furnace 12, and the laminated raw material 7 on the pallet 6 is continuously operated while controlling the speed so that the sintering reaction is completed over all layers while reaching the mine ore.
【００１８】焼結原料１は１次ミキサー１４で混合し、
２次ミキサー１４’で造粒してサージホッパー２に輸送
される。鉄鉱石類等の焼結原料貯鉱槽１３と並ぶ粉コー
クス貯鉱槽１５と石灰石貯鉱槽１６の搬送ラインである
搬入ラインか搬出ラインの輸送ベルトコンベヤー等にマ
イクロ波発生装置１７を設置してマイクロ波を照射する
か、または水添加装置でスプレー状に水を添加して、粉
コークスおよび／または石灰石の表面水分または含有水
分を増加させ、その他の焼結原料と一緒に１次ミキサー
１４に搬送する。The sintering raw material 1 is mixed in the primary mixer 14,
It is granulated by the secondary mixer 14 'and transported to the surge hopper 2. A microwave generator 17 is installed on a transport belt conveyor or the like of a carry-in line or a carry-out line which is a carrier line of a powder coke ore storage tank 15 and a limestone ore storage tank 16 which are lined up with a sintering raw material storage tank 13 such as iron ore. By irradiating microwaves or adding water in a spray form with a water adding device to increase the surface water content or the water content of the coke powder and / or limestone, and the primary mixer 14 together with other sintering raw materials. Transport to.
【００１９】上記したように、ドワイトロイド式焼結機
において、粉コークスや石灰石の貯鉱槽の前か後の輸送
用コンベヤー上などの搬送ラインにマイクロ波発生装置
または水添加装置を設置するのが良い。貯鉱槽の前で粉
コークスや石灰石の表面水分または含有水分を増加させ
れば、貯鉱槽内で粉コークス同士や石灰石同士の擬似粒
化も期待でき、それらは焼結原料擬似粒子の核になりや
すく、より擬似粒化性向上の効果が期待できる。As described above, in the Dwightroid type sintering machine, the microwave generator or the water addition device is installed in the transportation line such as on the transportation conveyor before or after the powder coke or limestone storage tank. Is good. Increasing the surface water content or the water content of powdered coke or limestone in front of the storage tank can also be expected to cause pseudo-granulation of powdered coke or limestone in the storage tank. And the effect of further improving pseudo-granulation can be expected.
【００２０】表１に本実験に供した配合原料ならびに返
鉱、粉コークスの配合割合を示す。配合原料は種々の鉄
鉱石および石灰石、生石灰、蛇紋岩、スケール等の雑原
料を焼結鉱中のＳｉＯ2 、Ａｌ2 Ｏ3 がそれぞれ５．８
％、１．８％になるように調整し、塩基度は１．７にな
るように配合した。返鉱配合率は１５％一定、粉コーク
ス配合率は３．８％一定とした。Table 1 shows the blending ratio of the blended raw materials used in this experiment, as well as the returned ore and powder coke. As raw materials for compounding, various iron ore and limestone, quicklime, serpentine, scale and other miscellaneous raw materials were SiO 2 and Al 2 O 3 in the sintered ore of 5.8, respectively.
% And 1.8%, and the basicity was adjusted to 1.7. The return ore content was constant at 15% and the powder coke content was constant at 3.8%.
【００２１】[0021]
【表１】 [Table 1]
【００２２】配合原料に返鉱、粉コークスを配合後、水
を添加してミキサーで混合、造粒し、４０ｋｇ試験鍋で
層厚４００ｍｍ、負圧１２００ｍｍＡｑ一定とした。焼
結原料の混合時間は１分間、造粒時間は３分間とした。After returning ore and powder coke were blended with the blended raw material, water was added, and the mixture was mixed and granulated by a mixer, and the layer thickness was 400 mm and the negative pressure was 1200 mmAq constant in a 40 kg test pot. The mixing time of the sintering raw materials was 1 minute, and the granulation time was 3 minutes.
【００２３】比較例では、従来法により粉コークスの含
有水分が６ｍａｓｓ％、石灰石とその他鉄鉱石等の含有
水分が４ｍａｓｓ％、返鉱の含有水分がゼロの状態で混
合した後、焼結原料全体の水分含有率が６．５ｍａｓｓ
％になるように残りの水分を添加しながら造粒した。In the comparative example, the water content of the powder coke was 6 mass% by the conventional method, the water content of limestone and other iron ore was 4 mass%, and the water content of the return ore was zero. Has a water content of 6.5 mass
Granulation was carried out while the remaining water was added so that the content became 100%.
【００２４】実施例１では、含有水分が６ｍａｓｓ％の
粉コークスに２４５０ＭＨｚで定格発振出力４．９ｋＷ
のマイクロ波を２分間照射して粉コークスの表面に水分
を滲ませた後、含有水分が４ｍａｓｓ％の石灰石とその
他鉄鉱石等および含有水分がゼロの返鉱と混合した後、
焼結原料全体の水分含有率が６．５ｍａｓｓ％になるよ
うに残りの水分を添加しながら造粒した。In Example 1, the rated oscillation output was 4.9 kW at 2450 MHz in the powder coke containing 6 mass% of water.
After irradiating the surface of powdered coke with water for 2 minutes to mix water with limestone with a water content of 4 mass% and other iron ore and return ore with a water content of zero,
Granulation was carried out while adding the remaining water so that the water content of the entire sintering raw material was 6.5 mass%.
【００２５】実施例２では、含有水分が４ｍａｓｓ％の
石灰石に２４５０ＭＨｚで定格発振出力４．９ｋＷのマ
イクロ波を４分間照射して石灰石の表面に水分を滲ませ
た後、含有水分が６ｍａｓｓ％の粉コークス、含有水分
が４ｍａｓｓ％のその他鉄鉱石等と含有水分がゼロの返
鉱と混合した後、焼結原料全体の水分含有率が６．５ｍ
ａｓｓ％になるように残りの水分を添加しながら造粒し
た。In Example 2, limestone having a water content of 4 mass% was irradiated with microwaves having a rated oscillation output of 4.9 kW at 2450 MHz for 4 minutes to bleed the water on the surface of the limestone, and then the water content of 6 mass% was contained. After mixing powdered coke, other iron ore with a water content of 4 mass% and return ore with a water content of zero, the water content of the entire sintering raw material is 6.5 m.
Granulation was carried out while the remaining water was added so as to be ass%.
【００２６】実施例３では、含有水分が６ｍａｓｓ％の
粉コークスに２４５０ＭＨｚで定格発振出力４．９ｋＷ
のマイクロ波を２分間照射し、含有水分が４ｍａｓｓ％
の石灰石に２４５０ＭＨｚで定格発振出力４．９ｋＷの
マイクロ波を４分間照射して粉コークスと石灰石の表面
に水分を滲ませた後、含有水分が４ｍａｓｓ％のその他
鉄鉱石等と含有水分がゼロの返鉱と混合した後、焼結原
料全体の水分含有率が６．５ｍａｓｓ％になるように残
りの水分を添加しながら造粒した。In Example 3, a rated oscillation output of 4.9 kW at 2450 MHz was applied to powder coke having a water content of 6 mass%.
Is irradiated with microwave for 2 minutes and the water content is 4 mass%
After irradiating the limestone of No. 2 with a microwave with a rated oscillation output of 4.9 kW at 4450 MHz for 4 minutes to allow the surface of the powder coke and the limestone to bleed moisture, other iron ore with a moisture content of 4 mass% and the moisture content of zero. After mixing with the return ore, granulation was performed while adding the remaining water so that the water content of the entire sintering raw material would be 6.5 mass%.
【００２７】実施例４では、粉コークスと石灰石の表面
にスプレー水を添加してそれぞれの含有水分を１７％と
１３％に増加させた後、含有水分が４ｍａｓｓ％のその
他鉄鉱石等と含有水分がゼロの返鉱を混合した後、焼結
原料全体の水分含有率が６．５ｍａｓｓ％になるように
残りの水分を添加しながら造粒した。In Example 4, after adding spray water to the surfaces of the powder coke and the limestone to increase the water content of each to 17% and 13%, the water content of other iron ore and the like having a water content of 4 mass% After mixing the returned ore of zero, the granulation was performed while adding the remaining water so that the water content of the entire sintering raw material was 6.5 mass%.
【００２８】図２に、比較例と実施例１〜４で得られた
鍋試験の生産率、焼結時間、成品歩留、粉コークス原単
位、冷間強度（ＳＩ）、低温還元粉化指数（ＲＤＩ）、
被還元性（ＪＩＳ−ＲＩ）、ＮＯｘ排出量原単位を示
す。FIG. 2 shows the production rate, the sintering time, the product yield, the powder coke basic unit, the cold strength (SI), and the low temperature reduction powdering index of the pot tests obtained in Comparative Examples and Examples 1 to 4. (RDI),
Reducibility (JIS-RI) and basic unit of NOx emissions are shown.
【００２９】実施例では、従来法の比較例に対して生産
率が向上し、成品歩留も向上し、粉コークス原単位が低
減し、冷間強度（ＳＩ）と低温還元粉化指数（ＲＤ
Ｉ）、被還元性（ＪＩＳ−ＲＩ）の焼結鉱品質が改善さ
れ、ＮＯｘ排出量原単位も大幅に低下した。In the example, the production rate is improved, the product yield is improved, the powder coke unit consumption is reduced, the cold strength (SI) and the low temperature reduced pulverization index (RD) are improved in comparison with the comparative example of the conventional method.
I), reducible (JIS-RI) sinter quality was improved, and NOx emission intensity was also significantly reduced.
【００３０】[0030]
【発明の効果】本発明はバインダーを添加しないで焼結
原料の擬似粒化性を向上させることができ、費用の高い
設備の新設も不要であり、両立し難い改善効果を同時に
もたらす。EFFECTS OF THE INVENTION The present invention can improve the pseudo-granulation property of the sintering raw material without adding a binder, does not require the installation of expensive equipment, and brings about an improvement effect that is difficult to achieve at the same time.
【図１】本発明を実施する装置の例を示す図である。FIG. 1 is a diagram showing an example of an apparatus for carrying out the present invention.
【図２】実施例の結果を示す図である。FIG. 2 is a diagram showing a result of an example.
１ 焼結原料 ２ サージホッパー ３ ドラムフィーダー ４ スプロケット ５ 原料装入装置 ６ パレット ７ 積層原料 ８ ウインドボックス ９ メインダクト １０ 排ガス集塵機 １１ 吸引ブロワー １２ 点火炉 １３ 焼結原料貯鉱槽 １４ １次ミキサー １４’ ２次ミキサー １５ 粉コークス貯鉱槽 １６ 石灰石貯鉱槽 １７ マイクロ波発生装置 1 Sintering raw material 2 Surge hopper 3 Drum feeder 4 Sprocket 5 Raw material charging device 6 Pallet 7 Laminated raw material 8 Windbox 9 Main duct 10 Exhaust gas dust collector 11 Suction blower 12 Ignition furnace 13 Sintering raw material storage tank 14 Primary mixer 14 ' Secondary mixer 15 Powder coke storage tank 16 Limestone storage tank 17 Microwave generator
Claims (5)
灰石にマイクロ波を照射して加熱し、前記粉コークスお
よび／または石灰石の内部の水分を表面に滲ませた後、
鉄鉱石を主体とするその他の焼結原料と混合して造粒す
ることを特徴とする焼結原料の事前処理方法。1. A coke powder and / or limestone, which is a sintering raw material, is irradiated with microwaves to be heated to allow the water content in the coke powder and / or limestone to bleed on the surface,
A pretreatment method for a sintering raw material, which comprises mixing with another sintering raw material mainly composed of iron ore and granulating.
灰石に水を添加して、前記粉コークスおよび／または石
灰石の含水量を１０〜３０ｍａｓｓ％にした後、鉄鉱石
を主体とするその他の焼結原料と混合して造粒すること
を特徴とする焼結原料の事前処理方法。2. Water is added to the powdered coke and / or limestone as a sintering raw material to adjust the water content of the powdered coke and / or limestone to 10 to 30 mass%, and then other firing mainly composed of iron ore. A pretreatment method for a sintering raw material, which comprises mixing with a binding raw material and granulating.
灰石の搬送ライン上に設置したマイクロ波発生装置から
前記粉コークスおよび／または石灰石の上にマイクロ波
を照射することを特徴とする請求項１記載の焼結原料の
事前処理方法。3. The microwave is radiated onto the powder coke and / or limestone from a microwave generator installed on a conveying line of the powder coke and / or limestone which is a sintering raw material. A pretreatment method for the sintering raw material described.
灰石の搬送ライン上に設置した水添加装置から前記粉コ
ークスおよび／または石灰石の上に水をスプレー状に添
加することを特徴とする請求項２記載の焼結原料の事前
処理方法。4. Water is added in a spray form onto the powdered coke and / or limestone from a water addition device installed on a conveying line of the powdered coke and / or limestone as a sintering raw material. 2. The pretreatment method for a sintering raw material according to 2.
灰石の輸送用コンベヤーのヘッドの落ち口に設置した水
添加装置から、落下する前記粉コークスおよび／または
石灰石に水をスプレー状に添加することを特徴とする請
求項２記載の焼結原料の事前処理方法。5. Addition of water in a spray form to the falling powder coke and / or limestone from a water addition device installed at the outlet of a head of a conveyor for transporting powder coke and / or limestone as a sintering raw material. The pretreatment method for a sintering raw material according to claim 2, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12039895A JPH08295951A (en) | 1995-04-24 | 1995-04-24 | Pretreatment of material to be sintered |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12039895A JPH08295951A (en) | 1995-04-24 | 1995-04-24 | Pretreatment of material to be sintered |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08295951A true JPH08295951A (en) | 1996-11-12 |
Family
ID=14785228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12039895A Withdrawn JPH08295951A (en) | 1995-04-24 | 1995-04-24 | Pretreatment of material to be sintered |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08295951A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7745366B2 (en) | 2008-11-04 | 2010-06-29 | King Fahd University Of Petroleum And Minerals | Microwave spent catalyst decoking method |
| CN109706313A (en) * | 2019-01-10 | 2019-05-03 | 鞍钢股份有限公司 | A method of improving microwave preheating sintered mixture moisture and is lost |
-
1995
- 1995-04-24 JP JP12039895A patent/JPH08295951A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7745366B2 (en) | 2008-11-04 | 2010-06-29 | King Fahd University Of Petroleum And Minerals | Microwave spent catalyst decoking method |
| CN109706313A (en) * | 2019-01-10 | 2019-05-03 | 鞍钢股份有限公司 | A method of improving microwave preheating sintered mixture moisture and is lost |
| CN109706313B (en) * | 2019-01-10 | 2020-06-23 | 鞍钢股份有限公司 | Method for improving water loss of microwave preheated sintering mixture |
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